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
- <?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
- <context:property-placeholder location="classpath:jdbc.properties"/>
1.3、jdbc.properties的配置如下
- 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
- <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
- 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("${jdbc_password}")
- public String password;
- }
1.6、在controller中调用
- @RequestMapping("/service/**")
- @Controller
- public class JdbcController{
- @Autowired
- private JdbcConfig Config; //引用统一的参数配置类
- @Value("${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:
- {
- 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
- <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
- <?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
- <util:properties id="settings" location="classpath:config.properties"/>
2.3、config.properties的配置如下
- 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
- 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
- @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:
- {
- "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
- 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
- @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:
- {
- "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:
- <?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>