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

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>