Springboot读取配置文件及自定义配置文件

1.创建maven工程，在pom文件中添加依赖

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    </parent>

  <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- 单元测试使用 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>
  
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </dependency>
   
  </dependencies>

2.创建项目启动类 StartApplication.java

package com.kelly.controller;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableAutoConfiguration //自动加载配置信息
@ComponentScan("com.kelly")//使包路径下带有注解的类可以使用@Autowired自动注入
public class StartApplication {
    public static void main(String[] args) {
        SpringApplication.run(StartApplication.class, args);
    }
}

3.编辑配置文件application.properties及自定义配置文件define.properties

　　application.properties

#访问的根路径
server.context-path=/springboot
#端口号
server.port=8081
#session失效时间
server.session-timeout=30
#编码
server.tomcat.uri-encoding=utf-8

test.name=kelly
test.password=admin123

　　define.properties

defineTest.pname=test
defineTest.password=test123

4.读取application.properties配置文件中的属性值

　　FirstController.java

package com.kelly.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
public class FirstController {
    
    @Value("${test.name}")
    private String name;
    
    @Value("${test.password}")
    private String password;
    
    @RequestMapping("/")
    @ResponseBody
    String home()
    {
        return "Hello Springboot!";
    }
    
    @RequestMapping("/hello")
    @ResponseBody
    String hello()
    {
        return "name: " + name + ", " + "password: " + password;
    }
}

5.打开浏览器，输入 http://localhost:8081/springboot/hello 即可看到结果

6.使用java bean的方式读取自定义配置文件 define.properties

　　DefineEntity.java

package com.kelly.entity;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix="defineTest")
@PropertySource("classpath:define.properties")
public class DefineEntity {
    
    private String pname;
    
    private String password;

    public String getPname() {
        return pname;
    }

    public void setPname(String pname) {
        this.pname = pname;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    
    
}

　　SecondController.java

package com.kelly.controller;

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.ResponseBody;

import com.kelly.entity.DefineEntity;

@Controller
public class SecondController {
    
    @Autowired
    DefineEntity defineEntity;
    
    @RequestMapping("/define")
    @ResponseBody
    String define()
    {
        return "test.name:" + defineEntity.getPname() + ", test.password:" + defineEntity.getPassword();
    }
}

7.打开浏览器，访问 http://localhost:8081/springboot/define，可以看到输出结果

补充：我的项目的目录结构

如果遇到问题也可以留言，我如果看到的话，不管会不会都会给与回复的，我们可以共同讨论，一起学习进步。