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。