SpringBoot的Controller使用

一：

1.注解

　　

2.control注解

　　

　　

　　

3.效果

　　

4.RespomseBody

 package com.caojun.springboot;

 import org.springframework.beans.factory.annotation.Autowired;
 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.RequestMethod;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.bind.annotation.RestController;

 @Controller
 @ResponseBody
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

     @RequestMapping(value="/hello")
     public String say(){
         return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

5.效果

　　

6.hello与hi都可以访问

 @RestController
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

     @RequestMapping(value={"/hello","/hi"})
     public String say(){
         return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

7.效果

　　

8.RequestMapping的类上使用的方式

 @RestController
 @RequestMapping(value = "/hello")
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

     @RequestMapping(value={"/say"})
     public String say(){
         return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

9.效果

　　

二：

1.注解

　　

2.PathVariable的使用

 @RestController
 @RequestMapping(value = "/hello")
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

     @RequestMapping(value={"/say/{id}"})
     public String say(@PathVariable("id") Integer id){
         return "id:"+id;
 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

3.效果

　　看起来url特别简洁。

　　

4.RequestParam的使用

　　这个针对的是？=这种url

 @RestController
 @RequestMapping(value = "/hello")
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

     @RequestMapping(value={"/say"})
     public String say(@RequestParam("id") Integer myId){
         return "id:"+myId;
 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

5.效果

　　

6.设置默认值

 @RestController
 @RequestMapping(value = "/hello")
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

     @RequestMapping(value={"/say"})
     public String say(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myId){
         return "id:"+myId;
 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

7.效果

　　

8.GetMapping的使用

　　简化RequestMapping

 @RestController
 @RequestMapping(value = "/hello")
 public class HelloSpringBoot {

     @Autowired
     private PeoplePerties peoplePerties;

 //    @RequestMapping(value={"/say"},method = RequestMethod.GET)
     @GetMapping(value = "/say")
     public String say(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myId){
         return "id:"+myId;
 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
 //        return "index";
     }
 }

9.效果