Spring boot将配置属性注入到bean类中

https://blog.csdn.net/wangmx1993328/article/details/81002901

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2019-01-29 00:14:04.856 ERROR 10988 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorSettings': Could not bind properties to AuthorSettings (prefix=info.author, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:336) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:292) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1623) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121) [spring-boot-test-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.12.jar:4.12]
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) [junit-rt.jar:na]
Caused by: javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:181) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:103) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.validation.DataBinder.validate(DataBinder.java:878) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:289) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:250) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:331) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	... 42 common frames omitted

2019-01-29 00:14:04.865 ERROR 10988 --- [           main] o.s.test.context.TestContextManager      : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@37374a5e] to prepare test instance [com.tangcheng.learning.custom.AuthorSettingsTest@14b0b7f9]

java.lang.IllegalStateException: Failed to load ApplicationContext
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.12.jar:4.12]
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) [junit-rt.jar:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorSettings': Could not bind properties to AuthorSettings (prefix=info.author, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:336) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:292) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1623) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121) ~[spring-boot-test-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	... 24 common frames omitted
Caused by: javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:181) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:103) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.validation.DataBinder.validate(DataBinder.java:878) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:289) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:250) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:331) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	... 42 common frames omitted

java.lang.IllegalStateException: Failed to load ApplicationContext

	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189)
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorSettings': Could not bind properties to AuthorSettings (prefix=info.author, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:336)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:292)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1623)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
	... 24 more
Caused by: javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:181)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87)
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208)
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:103)
	at org.springframework.validation.DataBinder.validate(DataBinder.java:878)
	at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:289)
	at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:250)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:331)
	... 42 more

Process finished with exit code -1

@ConfigurationProperties和@value都是将外部属性注入到对象

@ConfigurationProperties很方便使用。 比用@value注解好吗? 在特定的方案中是的,这只是一个选择问题

@EnableConfigurationProperties //开启属性注入,有此注解就可以通过@autowired注入， 是配合@ConfigurationProperties使用的。
如果没有@EnableConfigurationProperties，则使用@ConfigurationProperties注解的class上面还需要添加@Component（@Component的包装注解，譬如

@Configuration、@Service也可以。但本质还是注解@Component）

@EnableAutoConfiguration在Spring boot中是启动自动配置的（Auto-configuration tries to be as intelligent as possible and will back-away as you define more of your own configuration.）

yml：
map结构：

myProps: #自定义的属性和值
  simpleProp: simplePropValue
  arrayProps: 1,2,3,4,5
  listProp1:   #List中的元素是Map
    - name: abc
      value: abcValue
    - name: efg
      value: efgValue
  listProp2:
    - config2Value1
    - config2Vavlue2
  mapProps:
    key1: value1
    key2: value2  

@Component
@ConfigurationProperties(prefix="myProps") //接收application.yml中的myProps下面的属性
public class MyProps {
    private String simpleProp;
    private String[] arrayProps;
    private List<Map<String, String>> listProp1 = new ArrayList<>(); //接收prop1里面的属性值,List中的元素是Map
    private List<String> listProp2 = new ArrayList<>(); //接收prop2里面的属性值
    private Map<String, String> mapProps = new HashMap<>(); //接收prop1里面的属性值  

    public String getSimpleProp() {
        return simpleProp;
    }  

    //String类型的一定需要setter来接收属性值；maps, collections, 和 arrays 不需要
    public void setSimpleProp(String simpleProp) {
        this.simpleProp = simpleProp;
    }  

    public List<Map<String, String>> getListProp1() {
        return listProp1;
    }
    public List<String> getListProp2() {
        return listProp2;
    }  

    public String[] getArrayProps() {
        return arrayProps;
    }  

    public void setArrayProps(String[] arrayProps) {
        this.arrayProps = arrayProps;
    }  

    public Map<String, String> getMapProps() {
        return mapProps;
    }  

    public void setMapProps(Map<String, String> mapProps) {
        this.mapProps = mapProps;
    }
} 

http://blog.csdn.net/clementad/article/details/51970962

Take a look at the javadoc for ConfigurationProperties for more information on its various configuration options. For example, you can set a prefix to divide your configuration into a number of different namespaces:

@ConfigurationProperties(prefix="foo")
For the binding to work, you'd then have to use the same prefix on the properties declared in application.properties:

foo.users.alice=alpha
foo.users.bob=bravo

注入到Map类型的users字段中， alice和bob是map结构的key，等号后面的是value

一、@ConfigurationProperties注解的使用

看配置文件，我的是yaml格式的配置：

// file application.yml
my:
  servers:
    - dev.bar.com
    - foo.bar.com
    - jiaobuchong.com

下面我要将上面的配置属性注入到一个Java Bean类中，看码：

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

@Component      //不加这个注解的话, 使用@Autowired 就不能注入进去了
@ConfigurationProperties(prefix = "my")  // 配置文件中的前缀
public class MyConfig {
    private List<String> servers = new ArrayList<String>();
    public List<String> getServers() { return this.servers;
    }
}

下面写一个Controller来测试一下：

@RequestMapping("/test")
@RestController
public class HelloController {
    @Autowired
    private MyConfig myConfig;

    @RequestMapping("/config")
    public Object getConfig() {
        return myConfig.getServers();
    }
}

下面运行Application.java的main方法跑一下看看：

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        // 启动Spring Boot项目的唯一入口
        SpringApplication app = new SpringApplication(Application.class);
        app.setBannerMode(Banner.Mode.OFF);
        app.run(args);
    }

在浏览器的地址栏里输入： 
localhost:8080/test/config 得到： 
[“dev.bar.com”,”foo.bar.com”,”jiaobuchong.com”]

@EnableAutoConfiguration

/**
 * Enable auto-configuration of the Spring Application Context, attempting to guess and configure beans that you are likely to need. Auto-configuration classes are usually

 * applied based on your classpath and what beans you have defined. For example, If you
 * have {@code tomcat-embedded.jar} on your classpath you are likely to want a
 * {@link TomcatEmbeddedServletContainerFactory} (unless you have defined your own
 * {@link EmbeddedServletContainerFactory} bean).
 * <p>
 * Auto-configuration tries to be as intelligent as possible and will back-away as you
 * define more of your own configuration. You can always manually {@link #exclude()} any
 * configuration that you never want to apply (use {@link #excludeName()} if you don't
 * have access to them). You can also exclude them via the
 * {@code spring.autoconfigure.exclude} property. Auto-configuration is always applied
 * after user-defined beans have been registered.
 * <p>
 * The package of the class that is annotated with {@code @EnableAutoConfiguration} has
 * specific significance and is often used as a 'default'. For example, it will be used
 * when scanning for {@code @Entity} classes. It is generally recommended that you place
 * {@code @EnableAutoConfiguration} in a root package so that all sub-packages and classes
 * can be searched.
 * <p>
 * Auto-configuration classes are regular Spring {@link Configuration} beans. They are
 * located using the {@link SpringFactoriesLoader} mechanism (keyed against this class).
 * Generally auto-configuration beans are {@link Conditional @Conditional} beans (most
 * often using {@link ConditionalOnClass @ConditionalOnClass} and
 * {@link ConditionalOnMissingBean @ConditionalOnMissingBean} annotations).
 *
 * @author Phillip Webb
 * @author Stephane Nicoll
 * @see ConditionalOnBean
 * @see ConditionalOnMissingBean
 * @see ConditionalOnClass
 * @see AutoConfigureAfter
 */
@SuppressWarnings("deprecation")
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(EnableAutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {

二、@ConfigurationProperties和@EnableConfigurationProperties注解结合使用

在spring boot中使用yaml进行配置的一般步骤是， 
1、yaml配置文件，这里假设：

my:
  webserver:
    #HTTP 监听端口
    port: 80
    #嵌入Web服务器的线程池配置
    threadPool:
      maxThreads: 100
      minThreads: 8
      idleTimeout: 60000

2、

//file MyWebServerConfigurationProperties.java
import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "my.webserver")  //没有使用@Component或@Confinguration，因此此对象不会注册到Spring容器中，需要@EnableConfigurationProperties引用
public class MyWebServerConfigurationProperties {
    private int port;
    private ThreadPool threadPool;

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    public ThreadPool getThreadPool() {
        return threadPool;
    }

    public void setThreadPool(ThreadPool threadPool) {
        this.threadPool = threadPool;
    }

    public static class ThreadPool {
        private int maxThreads;
        private int minThreads;
        private int idleTimeout;

        public int getIdleTimeout() {
            return idleTimeout;
        }

        public void setIdleTimeout(int idleTimeout) {
            this.idleTimeout = idleTimeout;
        }

        public int getMaxThreads() {
            return maxThreads;
        }

        public void setMaxThreads(int maxThreads) {
            this.maxThreads = maxThreads;
        }

        public int getMinThreads() {
            return minThreads;
        }

        public void setMinThreads(int minThreads) {
            this.minThreads = minThreads;
        }
    }
}

3、

// file: MyWebServerConfiguration.java
import org.springframework.context.annotation.Configuration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;

@Configuration
@EnableConfigurationProperties(MyWebServerConfigurationProperties.class)
public class MyWebServerConfiguration {
    @Autowired
    private MyWebServerConfigurationProperties properties;
    /**
     *下面就可以引用MyWebServerConfigurationProperties类       里的配置了
    */
   public void setMyconfig() {
       String port = properties.getPort();
       // ...........
   }
}

The @EnableConfigurationProperties annotation is automatically applied to your project so that any beans annotated with @ConfigurationProperties will be configured from the Environment properties. This style of configuration works particularly well with the SpringApplication external YAML configuration.(引自spring boot官方手册)

三、@Bean配置第三方组件(Third-party configuration)

创建一个bean类：

// file ThreadPoolBean.java
public class ThreadPoolBean {
    private int maxThreads;
    private int minThreads;
    private int idleTimeout;

    public int getMaxThreads() {
        return maxThreads;
    }

    public void setMaxThreads(int maxThreads) {
        this.maxThreads = maxThreads;
    }

    public int getMinThreads() {
        return minThreads;
    }

    public void setMinThreads(int minThreads) {
        this.minThreads = minThreads;
    }

    public int getIdleTimeout() {
        return idleTimeout;
    }

    public void setIdleTimeout(int idleTimeout) {
        this.idleTimeout = idleTimeout;
    }
}

引用前面第二部分写的配置类：MyWebServerConfiguration.java和MyWebServerConfigurationProperties.java以及yaml配置文件,现在修改MyWebServerConfiguration.java类：

import com.jiaobuchong.springboot.domain.ThreadPoolBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration  //这是一个配置类，与@Service、@Component的效果类似。spring会扫描到这个类，@Bean才会生效，将ThreadPoolBean这个返回值类注册到spring上下文环境中
@EnableConfigurationProperties(MyWebServerConfigurationProperties.class) //通过这个注解, 将MyWebServerConfigurationProperties这个类的配置到上下文环境中,本类中使用的@Autowired注解注入才能生效
public class MyWebServerConfiguration {
    @SuppressWarnings("SpringJavaAutowiringInspection") //加这个注解让IDE 不报: Could not autowire
    @Autowired
    private MyWebServerConfigurationProperties properties;

    @Bean //@Bean注解在方法上,返回值是一个类的实例,并声明这个返回值(返回一个对象)是spring上下文环境中的一个bean
    public ThreadPoolBean getThreadBean() {
        MyWebServerConfigurationProperties.ThreadPool threadPool = properties.getThreadPool();
        ThreadPoolBean threadPoolBean = new ThreadPoolBean();
        threadPoolBean.setIdleTimeout(threadPool.getIdleTimeout());
        threadPoolBean.setMaxThreads(threadPool.getMaxThreads());
        threadPoolBean.setMinThreads(threadPool.getMinThreads());
        return threadPoolBean;
    }
}

被@Configuration注解标识的类，通常作为一个配置类，这就类似于一个xml文件，表示在该类中将配置Bean元数据，其作用类似于Spring里面application-context.xml的配置文件，而@Bean标签，则类似于该xml文件中，声明的一个bean实例。

写一个controller测试一下：

import com.jiaobuchong.springboot.domain.ThreadPoolBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RequestMapping("/first")
@RestController
public class HelloController {
    @Autowired
    private ThreadPoolBean threadPoolBean;
    @RequestMapping("/testbean")
    public Object getThreadBean() {
        return threadPoolBean;
    }
}

运行Application.java的main方法， 
在浏览器里输入：http://localhost:8080/first/testbean 
得到的返回值是： 
{“maxThreads”:100,”minThreads”:8,”idleTimeout”:60000}

http://blog.csdn.net/jiaobuchong/article/details/50442709

el最常用的几种使用场景：

• 从配置文件中读取属性
• 缺失值情况下，配置默认值
• el内部字符串使用String的方法
• 三目运算符
• 正则表达式
• 注入系统属性（system properties）
• 调用系统原有函数
• 直接注入文件进行操作
• 读取另一个bean的函数的返回值

1、从配置文件中读取属性

application.properties

name=\u8D75\u8BA1\u521A

1     @Value("${name}")//这里必须使用$，使用#是不行的
2     private String name;
3     @RequestMapping(value = "/name", method = RequestMethod.GET)
4     public String getName() {
5         return name;
6     }

注意：记住下边三句话

• ${}不支持表达式（三目表达式不算表达式）；#{}支持
• ${}读取属性文件的值
• ${}读取最后一个满足条件的值；#{}读取所有满足条件的值

2、缺失值情况下，配置默认值

1     @Value("${name2:'刚子'}")//这里必须使用$，使用#是不行的
2     private String name2;
3     @RequestMapping(value = "/name2", method = RequestMethod.GET)
4     public String getName2() {
5         return name2;
6     }

3、el内部字符串使用String的方法

1 name.list=\u8D75\u8BA1\u521A,\u738B\u5A1C

1     @Value("#{'${name.list}'.split(',')}")
2     private List<String> nameList;
3     @RequestMapping(value = "/nameList", method = RequestMethod.GET)
4     public List<String> getNameList() {
5         return nameList;
6     }

4、三目运算符

1 name.three=\u6768\u8FC7

1     @RequestMapping(value = "/nameThree", method = RequestMethod.GET)
2     public String getNameThree(@Value("${name.three!='杨过'?'黄蓉':'小龙女'}") String nameThree) {
3         return nameThree;
4     }

注意：@value可以直接作为入参

5、正则表达式

1     @Value("#{'100' matches '\\d+'}")//这里必须使用#，使用$是不行的
2     private boolean isDigital;
3     @RequestMapping(value = "/nameRegEx", method = RequestMethod.GET)
4     public boolean getNameRegEx() {
5         return isDigital;
6     }

6、注入系统属性

1     @Value("#{systemProperties['os.name']}")//这里必须使用#，使用$是不行的
2     private String osName;
3     @RequestMapping(value = "/osName", method = RequestMethod.GET)
4     public String getOsName() {
5         return osName;
6     }

7、调用系统原有函数

1     @Value("#{T(java.lang.Math).random() * 10}")//注意：这里只生成一次，之后你无论调用多少次getRandomValue()，都返回同一个值
2     private String randomValue;
3     @RequestMapping(value = "/randomValue", method = RequestMethod.GET)
4     public String getRandomValue() {
5         return randomValue;
6     }

8、直接注入文件进行操作

testfile/testEl.txt

1 乔峰--降龙十八掌
2 杨过--黯然销魂掌

 1     @Value("classpath:testfile/testEl.txt")
 2     private Resource txtResource;
 3     @RequestMapping(value = "/resource", method = RequestMethod.GET)
 4     public String getResource() {
 5         try {
 6             return IOUtils.toString(txtResource.getInputStream(), "UTF-8");
 7         } catch (IOException e) {
 8             ExceptionUtils.getStackTrace(e);
 9         }
10         return StringUtils.EMPTY;
11     }

注意：这个很重要，操作文件使用Apache.commons.io.IOUtils来操作。

9、读取另一个bean的函数的返回值

1 @Component("eLComponent")
2 public class ELComponent {
3     public String getNameBean(){
4         return "乔峰";
5     }
6 }

1     @Value("#{eLComponent.getNameBean()}")//这里必须使用#，使用$是不行的
2     private String nameBean;
3     @RequestMapping(value = "/nameBean", method = RequestMethod.GET)
4     public String getNameBean() {
5         return nameBean;
6     }

注意：被调用bean最好指定一下beanName。

http://www.cnblogs.com/java-zhao/archive/2016/07/01/5633881.html

application.properties中的配置：

db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/mydb?characterEncoding=utf-8&useSSL=false
db.username=xxx
db.password=xxx

import java.beans.PropertyVetoException;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import com.mchange.v2.c3p0.ComboPooledDataSource;

@Configuration
public class DBconfig {
    @Autowired
    private Environment env;

    @Bean(name="dataSource")
    public ComboPooledDataSource dataSource() throws PropertyVetoException {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(env.getProperty("db.driverClassName"));
        dataSource.setJdbcUrl(env.getProperty("db.url"));
        dataSource.setUser(env.getProperty("db.username"));
        dataSource.setPassword(env.getProperty("db.password"));
        dataSource.setMaxPoolSize(20);
        dataSource.setMinPoolSize(5);
        dataSource.setInitialPoolSize(10);
        dataSource.setMaxIdleTime(300);
        dataSource.setAcquireIncrement(5);
        dataSource.setIdleConnectionTestPeriod(60);
        return dataSource;
    }
}