Spring加载Properties配置文件

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IDEA使用Maven搭建SSM框架Web项目

观前提示：

IDEA版本为ultimate 2019.1，JDK版本为1.8.0_141，Tomcat版本为9.0.12，postman版本为v7.27.1。

标题2.3.4.5测试用配置文件 jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useSSL=false
jdbc.username=root
jdbc.password=root

jdbc.pool.initialPoolSize=10
jdbc.pool.minPoolSize=5
jdbc.pool.maxPoolSize=40
jdbc.pool.maxIdleTime=20
jdbc.pool.checkoutTimeout=10000

1.@PropertySource注解

配置文件 test.properties

id=01
name=zhangsan
age=18

配置文件加载类 TestProperties .java

package com.example.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@PropertySource(value = {
   "classpath:config/test.properties"})
public class TestProperties {
   
    @Value("id")
    private String id;

    @Value("name")
    private String name;

    @Value("age")
    private String age;

    public String getId() {
   
        return id;
    }

    public void setId(String id) {
   
        this.id = id;
    }

    public String getName() {
   
        return name;
    }

    public void setName(String name) {
   
        this.name = name;
    }

    public String getAge() {
   
        return age;
    }

    public void setAge(String age) {
   
        this.age = age;
    }

    @Override
    public String toString() {
   
        return "TestProperties{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", age='" + age + '\'' +
                '}';
    }
}

测试文件 TestController .java

package com.example.controller;

import com.example.config.TestProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/test")
public class TestController {
   

    @Autowired
    private TestProperties testProperties;

    @RequestMapping(value = "/testProperties", method = RequestMethod.GET)
    @ResponseBody
    public String testProperties(){
   
        return testProperties.toString();
    }
}

使用postman发送请求，测试结果为

2.context:property-placeholder标签

2.1 参考配置

xml文件中配置参考如下

<context:property-placeholder location="/WEB-INF/config/jdbc.properties"/>

注意：取值时使用 ${}

2.2 例子

2.2.1 在xml中取值

<property name="driverClassNa