Spring_构造注入
依赖注入的第二种注入方式:构造器注入
创建带参数的构造方法,参数类型为注入类的类型
项目要先添加spring支持;
- package com;
- public class Computer {
- private Host host;
- private Display display;
- //public Computer(){}
- public Computer(Host host, Display display) {
- this.host = host;
- this.display = display;
- }
- public void run() {
- System.out.println(host.run() + "; " + display.run());
- }
- /*public void setHost(Host host) {
- this.host = host;
- }
- public void setDisplay(Display display) {
- this.display = display;
- }*/
- }
package com; public class Computer { private Host host; private Display display; //public Computer(){} public Computer(Host host, Display display) { this.host = host; this.display = display; } public void run() { System.out.println(host.run() + "; " + display.run()); } /*public void setHost(Host host) { this.host = host; } public void setDisplay(Display display) { this.display = display; }*/ }
- package com;
- public class Display {
- public String run(){
- return "我是显示器,我在运行";
- }
- }
package com; public class Display { public String run(){ return "我是显示器,我在运行"; } }
- package com;
- public class Host {
- public String run() {
- return "我是主机,我在运行";
- }
- }
package com; public class Host { public String run() { return "我是主机,我在运行"; } }
- <?xml version="1.0" encoding="UTF-8"?>
- <beans
- xmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xmlns:p="http://www.springframework.org/schema/p"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
- <bean id="host" class="com.Host"></bean>
- <bean id="display" class="com.Display"></bean>
- <bean id="computer" class="com.Computer">
- <!--要有默认构造方法,和属性的set方法-->
- <!-- <property name="host" ref="host"></property>
- <property name="display" ref="display"></property> -->
- <constructor-arg name="host" ref="host"/>
- <!-- 用另外一种,两种配置 -->
- <constructor-arg index="1">
- <ref bean="display"/>
- </constructor-arg>
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="host" class="com.Host"></bean> <bean id="display" class="com.Display"></bean> <bean id="computer" class="com.Computer"> <!--要有默认构造方法,和属性的set方法--> <!-- <property name="host" ref="host"></property> <property name="display" ref="display"></property> --> <constructor-arg name="host" ref="host"/> <!-- 用另外一种,两种配置 --> <constructor-arg index="1"> <ref bean="display"/> </constructor-arg> </bean> </beans>
TestComputer
- package com;
- import org.junit.Test;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- public class TestComputer {
- @Test
- public void testRun(){
- ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");
- Computer computer = (Computer) ac.getBean("computer");
- computer.run();
- }
- }
package com; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestComputer { @Test public void testRun(){ ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml"); Computer computer = (Computer) ac.getBean("computer"); computer.run(); } }
自动装配:Spring可以自动根据属性类型、名称等进行注入 autowire属性可以设置为no、byType或byName byName 一个都没找到,不报错;采用byName方式,将根据属性名称在Spring Bean Factory中找,找到即自动注入,否则,什么都不做 byType 找到一个以上报错; Spring提供了依赖检查功能 default-dependency-check属性 spring3.0以后没有了;
- package com;
- public class Computer {
- private Host host;
- private Display display;
- public Computer(){}
- public Computer(Host host, Display display) {
- this.host = host;
- this.display = display;
- }
- public void run() {
- System.out.println(host.run() + "; " + display.run());
- }
- public void setHost(Host host) {
- this.host = host;
- }
- public void setDisplay(Display display) {
- this.display = display;
- }
- }
package com; public class Computer { private Host host; private Display display; public Computer(){} public Computer(Host host, Display display) { this.host = host; this.display = display; } public void run() { System.out.println(host.run() + "; " + display.run()); } public void setHost(Host host) { this.host = host; } public void setDisplay(Display display) { this.display = display; } }
- package com;
- public class Display {
- public String run(){
- return "我是显示器,我在运行";
- }
- }
package com; public class Display { public String run(){ return "我是显示器,我在运行"; } }
- package com;
- public class Host {
- public String run() {
- return "我是主机,我在运行";
- }
- }
package com; public class Host { public String run() { return "我是主机,我在运行"; } }
- <?xml version="1.0" encoding="UTF-8"?>
- <beans
- xmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xmlns:p="http://www.springframework.org/schema/p"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"
- default-autowire="byName"
- >
- <!-- 第一种 :上面的 default-autowire="byName" 全局的,在beans上配置 -->
- <!-- 第二种:autowire="byName" 方式 -->
- <bean id="host" class="com.Host"></bean><!--autowire="byName"名字必须是host -->
- <bean id="display" class="com.Display"></bean>
- <bean id="computer" class="com.Computer" autowire="byName">
- <!-- 第二种:autowire="byType" 方式
- <bean id="host1" class="com.Host"></bean>
- <bean id="display1" class="com.Display"></bean>
- <bean id="computer" class="com.Computer" autowire="byType">
- -->
- <!--使用自动装配 这个不用
- <property name="host" ref="host"></property> -->
- </bean>
- </beans>
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd" default-autowire="byName" > <!-- 第一种 :上面的 default-autowire="byName" 全局的,在beans上配置 --> <!-- 第二种:autowire="byName" 方式 --> <bean id="host" class="com.Host"></bean><!--autowire="byName"名字必须是host --> <bean id="display" class="com.Display"></bean> <bean id="computer" class="com.Computer" autowire="byName"> <!-- 第二种:autowire="byType" 方式 <bean id="host1" class="com.Host"></bean> <bean id="display1" class="com.Display"></bean> <bean id="computer" class="com.Computer" autowire="byType"> --> <!--使用自动装配 这个不用 <property name="host" ref="host"></property> --> </bean> </beans>
- package com;
- import org.junit.Test;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- public class TestComputer {
- @Test
- public void testRun(){
- ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");
- Computer computer = (Computer) ac.getBean("computer");
- computer.run();
- }
- }
package com; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestComputer { @Test public void testRun(){ ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml"); Computer computer = (Computer) ac.getBean("computer"); computer.run(); } }
拆分配置文件: 新建Dao Service Action的配置文件,修改web.xml使用通配符*; 测试类测试 EmployeeServiceTest
拆分配置文件两种方法 1.配制Spring集成时:配制ContextLoadListener的contextConfigLocation属性,配置多个配置文件用,逗号隔开;或者使用通配符 2.在公用配置文件使用<import resource="x.xml"/>方式
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xmlns:p="http://www.springframework.org/schema/p"
- xmlns:tx="http://www.springframework.org/schema/tx"
- xmlns:aop="http://www.springframework.org/schema/aop"
- xmlns:context="http://www.springframework.org/schema/context"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
- http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
- http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
- ">
- <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
- </bean>
- <!-- 配置事务管理器 -->
- <bean id="txManage" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
- <property name="sessionFactory" ref="sessionFactory"></property>
- </bean>
- <!-- 要被事务管理(支持)的方法 -->
- <tx:advice id="txAdvice" transaction-manager="txManage">
- <tx:attributes >
- <!-- 默认false;propagation="REQUIRED":hibernate4的时候必须要使用 REQUIRED-->
- <tx:method name="get*" read-only="true" propagation="REQUIRED"/>
- <tx:method name="search*" read-only="true" propagation="REQUIRED"/>
- <tx:method name="find*" read-only="true" propagation="REQUIRED"/>
- <tx:method name="query*" read-only="true" propagation="REQUIRED"/>
- <tx:method name="*" rollback-for="DataAccessException" propagation="REQUIRED"/> <!-- 读写 -->
- </tx:attributes>
- </tx:advice>
- <!-- 切到类里面去(事务要加到哪里,一般在业务里面) -->
- <aop:config>
- <!--execution:切面要在哪里切,(* com.jboa.*.*(..)):com.jboa.service下所以的类,所以的方法,所以的返回值,都受到切面的影响 -->
- <aop:pointcut expression="execution(* com.jboa.service.*.*(..))" id="serviceMethods"/>
- <!-- 注释掉,就没事务了 -->
- <aop:advisor pointcut-ref="serviceMethods" advice-ref="txAdvice"/>
- </aop:config>
- <!-- 拆分配置文件:到新建 DaoApplicationContext.xml-->
- <!-- <bean id="accountDao" class="com.jboa.dao.impl.AccountDaoImpl" depends-on="sessionFactory">
- <property name="sessionFactory" ref="sessionFactory"></property>
- </bean>
- <bean id="employeeDao" class="com.jboa.dao.impl.EmployeeDaoImpl" depends-on="sessionFactory">
- <property name="sessionFactory" ref="sessionFactory"></property>
- </bean>
- <bean id="dictionaryDao" class="com.jboa.dao.impl.DictionaryDaoImpl" depends-on="sessionFactory">
- <property name="sessionFactory" ref="sessionFactory"></property>
- </bean> -->
- <!-- 拆分配置文件:到新建 ServiceApplicationContext.xml-->
- <!-- <bean id="employeeService" class="com.jboa.service.impl.EmployeeServiceImpl">
- <property name="employeeDao" ref="employeeDao"></property>
- </bean>
- <bean id="dictionaryService" class="com.jboa.service.impl.DictionaryServiceImpl">
- <property name="dictionaryDao" ref="dictionaryDao"></property>
- </bean> -->
- <!-- 拆分配置文件:到新建 ActionApplicationContext.xml-->
- <!-- <bean id="employeeAction" class="com.jboa.action.EmployeeAction" scope="prototype">
- <property name="employeeService" ref="employeeService"></property>
- <property name="dictionaryService" ref="dictionaryService"></property>
- </bean> -->
- <!-- 第二种方式 -->
- <!-- <import resource="DaoApplicationContext.xml"/>
- <import resource="ServiceApplicationContext.xml"/>
- <import resource="ActionApplicationContext.xml"/> -->
- </beans>
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd "> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="configLocation" value="classpath:hibernate.cfg.xml"></property> </bean> <!-- 配置事务管理器 --> <bean id="txManage" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- 要被事务管理(支持)的方法 --> <tx:advice id="txAdvice" transaction-manager="txManage"> <tx:attributes > <!-- 默认false;propagation="REQUIRED":hibernate4的时候必须要使用 REQUIRED--> <tx:method name="get*" read-only="true" propagation="REQUIRED"/> <tx:method name="search*" read-only="true" propagation="REQUIRED"/> <tx:method name="find*" read-only="true" propagation="REQUIRED"/> <tx:method name="query*" read-only="true" propagation="REQUIRED"/> <tx:method name="*" rollback-for="DataAccessException" propagation="REQUIRED"/> <!-- 读写 --> </tx:attributes> </tx:advice> <!-- 切到类里面去(事务要加到哪里,一般在业务里面) --> <aop:config> <!--execution:切面要在哪里切,(* com.jboa.*.*(..)):com.jboa.service下所以的类,所以的方法,所以的返回值,都受到切面的影响 --> <aop:pointcut expression="execution(* com.jboa.service.*.*(..))" id="serviceMethods"/> <!-- 注释掉,就没事务了 --> <aop:advisor pointcut-ref="serviceMethods" advice-ref="txAdvice"/> </aop:config> <!-- 拆分配置文件:到新建 DaoApplicationContext.xml--> <!-- <bean id="accountDao" class="com.jboa.dao.impl.AccountDaoImpl" depends-on="sessionFactory"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <bean id="employeeDao" class="com.jboa.dao.impl.EmployeeDaoImpl" depends-on="sessionFactory"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <bean id="dictionaryDao" class="com.jboa.dao.impl.DictionaryDaoImpl" depends-on="sessionFactory"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> --> <!-- 拆分配置文件:到新建 ServiceApplicationContext.xml--> <!-- <bean id="employeeService" class="com.jboa.service.impl.EmployeeServiceImpl"> <property name="employeeDao" ref="employeeDao"></property> </bean> <bean id="dictionaryService" class="com.jboa.service.impl.DictionaryServiceImpl"> <property name="dictionaryDao" ref="dictionaryDao"></property> </bean> --> <!-- 拆分配置文件:到新建 ActionApplicationContext.xml--> <!-- <bean id="employeeAction" class="com.jboa.action.EmployeeAction" scope="prototype"> <property name="employeeService" ref="employeeService"></property> <property name="dictionaryService" ref="dictionaryService"></property> </bean> --> <!-- 第二种方式 --> <!-- <import resource="DaoApplicationContext.xml"/> <import resource="ServiceApplicationContext.xml"/> <import resource="ActionApplicationContext.xml"/> --> </beans>
web.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
- http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
- <display-name></display-name>
- <welcome-file-list>
- <welcome-file>login.jsp</welcome-file>
- </welcome-file-list>
- <!-- 整合Spring -->
- <context-param>
- <param-name>contextConfigLocation</param-name>
- <!-- 第一种拆分方式 -->
- <param-value>classpath:*ApplicationContext.xml</param-value>
- <!-- 第二种拆分方式 -->
- <!-- <param-value>classpath:DefaultApplicationContext.xml</param-value> -->
- </context-param>
- <listener>
- <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
- </listener>
- <!-- 配置strut2的过滤器 -->
- <filter>
- <filter-name>struts2</filter-name>
- <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
- </filter>
- <filter-mapping>
- <filter-name>struts2</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- </web-app>
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list> <!-- 整合Spring --> <context-param> <param-name>contextConfigLocation</param-name> <!-- 第一种拆分方式 --> <param-value>classpath:*ApplicationContext.xml</param-value> <!-- 第二种拆分方式 --> <!-- <param-value>classpath:DefaultApplicationContext.xml</param-value> --> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 配置strut2的过滤器 --> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
然后执行测试类测试:
- package com.jboa.service;
- import org.junit.Test;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import com.jboa.model.Department;
- import com.jboa.model.Employee;
- import com.jboa.model.Postion;
- public class EmployeeServiceTest {
- @Test
- public void testAdd() {
- ApplicationContext ac = new ClassPathXmlApplicationContext("/*ApplicationContext.xml");
- EmployeeService employeeService = (EmployeeService) ac.getBean("employeeService");
- Employee employee = new Employee();
- employee.setSn("user111111");
- employee.setPassword("user111111");
- employee.setStatus("1");
- employee.setName("user111111");
- Postion p = new Postion();
- p.setId(2);
- employee.setPostion(p);
- Department d = new Department();
- d.setId(1);
- employee.setDepartment(d);
- employeeService.add(employee);
- }
- }
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