Spring 中加载 properties 文件
1. 在 src 下新建 xxx.properties 文件
2. 在 spring 配置文件中先引入 xmlns:context,在下面添加
2.1 如果需要记载多个配置文件逗号分割
<context:property-placeholder location="classpath:db.properties"/>
3 添加注解扫描
<context:component-scan base-package="com.bjsxt.service.impl"></context:component-scan>
4. 在被Spring管理的类中通过@Value(“${key}”)取出properties中内容
5.示例代码
5.1 application
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd" > <!--加载配置文件可以支持,分割同时加载多个配置文件--> <context:property-placeholder location="classpath:db.properties"/> <!--注解扫描器--> <context:component-scan base-package="com.suncl"></context:component-scan> </beans>
5.2 xx.properties
db.url=127.0.0.1/dev db.username=zhangsan db.pwd=1123456
5.3 实体类
package com.suncl.model; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; /** * Created by SCL-PC on 2019/3/5. */ @Component public class DbConfig { @Value("${db.url}") private String url; @Value("${db.username}") private String username; @Value("${db.pwd}") private String pwd; public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPwd() { return pwd; } public void setPwd(String pwd) { this.pwd = pwd; } @Override public String toString() { return "DbConfig{" + "url='" + url + '\'' + ", username='" + username + '\'' + ", pwd='" + pwd + '\'' + '}'; } }
5.4 测试类
package com.suncl.test; import com.suncl.model.DbConfig; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * Created by SCL-PC on 2019/2/28. */ public class Test { public static void main(String[] args) { ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); DbConfig dbConfig = (DbConfig)ac.getBean("dbConfig",DbConfig.class); System.out.println(dbConfig.toString()); } }
信息: Loading properties file from class path resource [db.properties] DbConfig{url='127.0.0.1/dev', username='zhangsan', pwd='1123456'}
以上就是spring加载配置文件的内容。