spring boot 利用分层结构输出简单的Hello world

男娘i 2022-06-09 01:00 139阅读 0赞

参考：[spring boot 输出简单的hello world （没用分层结构）  
][spring boot _hello world _]

### 项目结构 ###

![这里写图片描述][SouthEast]

![这里写图片描述][SouthEast 1]

### model代码 ###

package com.yubai.springbootjson.model;
    
    public class Hello {
        private String username;
        private int age;
    
        public Hello(String username, int age) {
            this.username = username;
            this.age = age;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    }

### responsitory代码 ###

package com.yubai.springbootjson.responsitory;
    
    import com.yubai.springbootjson.model.Hello;
    import org.springframework.stereotype.Repository;
    
    @Repository
    public class HelloResponsitory { 
    
        public String sayHello() {
            Hello hello = new Hello("jolie", 27);
            return "hello" + hello.getUsername();
        }
    }

### service代码： ###

package com.yubai.springbootjson.service;
    
    import com.yubai.springbootjson.responsitory.HelloResponsitory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloService {
    
        @Autowired
        private HelloResponsitory helloResponsitory;
    
        @RequestMapping("/hello")
        public String SayHello(){
           String str =  helloResponsitory.sayHello();
           return str;
        }
    }

### Aplication代码： ###

package com.yubai.springbootjson;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class SpringBootJsonApplication { 
    
        public static void main(String[] args) {
            SpringApplication.run(SpringBootJsonApplication.class, args);
        }
    }

启动程序后，在浏览器中输入：[http://localhost:8080/hello][http_localhost_8080_hello]。就可以看到输出信息。

![这里写图片描述][SouthEast 2]

[spring boot _hello world _]: http://blog.csdn.net/expect521/article/details/77507100
[SouthEast]: /images/20220609/7b9997440d1b469390a5f639139fefd4.png
[SouthEast 1]: /images/20220609/365b174fed0f49fcbcecf69893f185e1.png
[http_localhost_8080_hello]: http://localhost:8080/hello
[SouthEast 2]: /images/20220609/8b54b2f94d754a0f9e8882820cf8df9c.png