Springboot读取配置文件及自定义配置文件

Posted 2020-10-17 Java从入门到跑路

 

1.创建maven工程，在pom文件中添加依赖

 1   <parent>
 2     <groupId>org.springframework.boot</groupId>
 3     <artifactId>spring-boot-starter-parent</artifactId>
 4     <version>1.5.9.RELEASE</version>
 5     </parent>
 6 
 7   <dependencies>
 8     <dependency>
 9         <groupId>org.springframework.boot</groupId>
10         <artifactId>spring-boot-starter-web</artifactId>
11     </dependency>
12     <!-- 单元测试使用 -->
13     <dependency>
14         <groupId>org.springframework.boot</groupId>
15         <artifactId>spring-boot-starter-test</artifactId>
16     </dependency>
17   
18     <dependency>
19       <groupId>junit</groupId>
20       <artifactId>junit</artifactId>
21       <scope>test</scope>
22     </dependency>
23    
24   </dependencies>

 

2.创建项目启动类 StartApplication.java

 1 package com.kelly.controller;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 5 import org.springframework.context.annotation.ComponentScan;
 6 import org.springframework.context.annotation.Configuration;
 7 
 8 @Configuration
 9 @EnableAutoConfiguration //自动加载配置信息
10 @ComponentScan("com.kelly")//使包路径下带有注解的类可以使用@Autowired自动注入
11 public class StartApplication {
12     public static void main(String[] args) {
13         SpringApplication.run(StartApplication.class, args);
14     }
15 }

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

 1 package com.kelly.controller;
 2 
 3 import org.springframework.beans.factory.annotation.Value;
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.bind.annotation.ResponseBody;
 7 
 8 
 9 @Controller
10 public class FirstController {
11     
12     @Value("${test.name}")
13     private String name;
14     
15     @Value("${test.password}")
16     private String password;
17     
18     @RequestMapping("/")
19     @ResponseBody
20     String home()
21     {
22         return "Hello Springboot!";
23     }
24     
25     @RequestMapping("/hello")
26     @ResponseBody
27     String hello()
28     {
29         return "name: " + name + ", " + "password: " + password;
30     }
31 }

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

 1 package com.kelly.entity;
 2 
 3 import org.springframework.boot.context.properties.ConfigurationProperties;
 4 import org.springframework.context.annotation.PropertySource;
 5 import org.springframework.stereotype.Component;
 6 
 7 @Component
 8 @ConfigurationProperties(prefix="defineTest")
 9 @PropertySource("classpath:define.properties")
10 public class DefineEntity {
11     
12     private String pname;
13     
14     private String password;
15 
16     public String getPname() {
17         return pname;
18     }
19 
20     public void setPname(String pname) {
21         this.pname = pname;
22     }
23 
24     public String getPassword() {
25         return password;
26     }
27 
28     public void setPassword(String password) {
29         this.password = password;
30     }
31     
32     
33 }

　　SecondController.java

 1 package com.kelly.controller;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.bind.annotation.ResponseBody;
 7 
 8 import com.kelly.entity.DefineEntity;
 9 
10 @Controller
11 public class SecondController {
12     
13     @Autowired
14     DefineEntity defineEntity;
15     
16     @RequestMapping("/define")
17     @ResponseBody
18     String define()
19     {
20         return "test.name:" + defineEntity.getPname() + ", test.password:" + defineEntity.getPassword();
21     }
22 }

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

 

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