SpringMVC加载配置Properties文件的几种方式

最近开发的项目使用了SpringMVC的框架，用下来感觉SpringMVC的代码实现的非常优雅，功能也非常强大,

网上介绍Controller参数绑定、URL映射的文章都很多了，写这篇博客主要总结一下SpringMVC加载配置Properties文件的几种方式

通过读取Config文件的配置
例如：

Map<String, String> group = ConfigurationManager.GetConfiguration("config1");

this.setBcpApi(group.get("BCP.Webapi"));

this.setAppCode(group.get("BCP.AppCode"));

this.setGetCustomerApi(group.get("GetCustomer"));

1.通过context:property-placeholde实现配置文件加载

  1.1、在spring.xml中加入context相关引用

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd">  

 1.2、引入jdbc配置文件         

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<context:property-placeholder location="classpath:jdbc.properties"/>
1.3、jdbc.properties的配置如下

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jdbc_driverClassName=com.mysql.jdbc.Driver
jdbc_url=jdbc:mysql://localhost/testdb?useUnicode=true&characterEncoding=utf8
jdbc_username=root
jdbc_password=123456  

1.4、在spring-mybatis.xml中引用jdbc中的配置

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<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init"
   destroy-method="close" >
   <property name="driverClassName">
     <value>${jdbc_driverClassName}</value>
   </property>
   <property name="url">
     <value>${jdbc_url}</value>
   </property>
   <property name="username">
     <value>${jdbc_username}</value>
   </property>
   <property name="password">
     <value>${jdbc_password}</value>
   </property>
   <!-- 连接池最大使用连接数 -->
   <property name="maxActive">
     <value>20</value>
   </property>
   <!-- 初始化连接大小 -->
   <property name="initialSize">
     <value>1</value>
   </property>
   <!-- 获取连接最大等待时间 -->
   <property name="maxWait">
     <value>60000</value>
   </property>
   <!-- 连接池最大空闲 -->
   <property name="maxIdle">
     <value>20</value>
   </property>
   <!-- 连接池最小空闲 -->
   <property name="minIdle">
     <value>3</value>
   </property>
   <!-- 自动清除无用连接 -->
   <property name="removeAbandoned">
     <value>true</value>
   </property>
   <!-- 清除无用连接的等待时间 -->
   <property name="removeAbandonedTimeout">
     <value>180</value>
   </property>
   <!-- 连接属性 -->
   <property name="connectionProperties">
     <value>clientEncoding=UTF-8</value>
   </property>
 </bean>  

1.5、在java类中引用jdbc.properties中的配置

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import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;  

@Configuration
public class JdbcConfig{      

    @Value("${jdbc_url}")
    public  String jdbcUrl; //这里变量不能定义成static  

    @Value("${jdbc_username}")
    public  String username;    

    @Value("${jdbc_password}")
    public  String password;    

}  

1.6、在controller中调用

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@RequestMapping("/service/**")
@Controller
public class JdbcController{  

         @Autowired
     private JdbcConfig Config; //引用统一的参数配置类  

         @Value("${jdbc_url}")
         private String jdbcUrl; //直接在Controller引用
         @RequestMapping(value={"/test"})
        public ModelMap test(ModelMap modelMap) {
               modelMap.put("jdbcUrl", Config.jdbcUrl);
               return modelMap;
          }
         @RequestMapping(value={"/test2"})
     public ModelMap test2(ModelMap modelMap) {
           modelMap.put("jdbcUrl", this.jdbcUrl);
           return modelMap;
     }
}  

1.7、测试

在ie中输入http://localhost:8080/testWeb/service/test 或http://localhost:8080/testWeb/service/test2  

返回如下结果：

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{
    jdbcUrl:"jdbc:mysql://localhost/testdb?useUnicode=true&characterEncoding=utf8"
}  

注：通过context:property-placeholde加载多个配置文件

 只需在第1.2步中将多个配置文件以逗号分隔即可 

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<context:property-placeholder location="classpath:jdbc.properties,classpath:XXX.properties"/>  

2、通过util:properties实现配置文件加载

 2.1、在spring.xml中加入util相关引用

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/util
      http://www.springframework.org/schema/util/spring-util-4.0.xsd">
2.2、 引入config配置文件  

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<util:properties id="settings" location="classpath:config.properties"/>  

2.3、config.properties的配置如下 

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gnss.server.url=http://127.0.0.1:8080/gnss/services/data-world/rest  

2.4、在java类中引用config中的配置
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import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;  

@Component
public class Config {
      @Value("#{settings['gnss.server.url']}")
      public  String GNSS_SERVER_URL;   

}
2.5、在controller中调用

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@RequestMapping("/service2/**")
@Controller
public class ConfigController{  

         @Autowired
     private Config Config; //引用统一的参数配置类  

         @RequestMapping(value={"/test"})
     public ModelMap test(ModelMap modelMap) {
        modelMap.put("gnss.service.url",Config.GNSS_SERVER_URL);
            return modelMap;
      }
}  

2.6、测试

在ie中输入http://localhost:8080/testWeb/service2/test

返回如下结果：

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{
   "gnss.service.url":"http://127.0.0.1:8080/gnss/services/data-world/rest"
}  

3.直接在Java类中通过注解实现配置文件加载

3.1、在java类中引入配置文件

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import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;  

@Configuration
@PropertySource(value="classpath:config.properties")
public class Config {   

@Value("${gnss.server.url}")
public  String GNSS_SERVER_URL;  

@Value("${gnss.server.url}")
public  String jdbcUrl;   

}
3.2、在controller中调用
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@RequestMapping("/service2/**")
@Controller
public class ConfigController{  

         @Autowired
     private Config Config; //引用统一的参数配置类  

          @RequestMapping(value={"/test"})
     public ModelMap test(ModelMap modelMap) {
        modelMap.put("gnss.service.url", Config.GNSS_SERVER_URL);
            return modelMap;
     }
}
3.3、测试

在ie中输入http://localhost:8080/testWeb/service2/test

返回如下结果：

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{
   "gnss.service.url":"http://127.0.0.1:8080/gnss/services/data-world/rest"
 }  

最后附上spring.xml的完整配置：

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/util
      http://www.springframework.org/schema/util/spring-util-4.0.xsd">  

    <!-- 引入jdbc配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>  

     <!-- 引入多配置文件 -->
       <context:property-placeholder location="classpath:jdbc.properties,classpath:XXX.properties"/>
     <!-- 通过util引入config配置文件 -->
     <!-- <util:properties id="settings" location="classpath:config.properties" /> -->
     <!-- 扫描文件（自动将servicec层注入） -->
     <context:component-scan base-package="修改成你的Config类所在的package"/></beans>
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