SpringBoot的Controller使用

一：

1.註解

　　

 

2.control註解

　　

　　

　　

 

3.效果

　　

4.RespomseBody

 1 package com.caojun.springboot;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.beans.factory.annotation.Value;
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.bind.annotation.RequestMethod;
 8 import org.springframework.web.bind.annotation.ResponseBody;
 9 import org.springframework.web.bind.annotation.RestController;
10 
11 @Controller
12 @ResponseBody
13 public class HelloSpringBoot {
14 
15     @Autowired
16     private PeoplePerties peoplePerties;
17 
18     @RequestMapping(value="/hello")
19     public String say(){
20         return peoplePerties.getName()+"====="+peoplePerties.getAge();
21 //        return "index";
22     }
23 }

 

5.效果

　　

 

6.hello與hi都可以訪問

 1 @RestController
 2 public class HelloSpringBoot {
 3 
 4     @Autowired
 5     private PeoplePerties peoplePerties;
 6 
 7     @RequestMapping(value={"/hello","/hi"})
 8     public String say(){
 9         return peoplePerties.getName()+"====="+peoplePerties.getAge();
10 //        return "index";
11     }
12 }

 

7.效果

　　

 

8.RequestMapping的類上使用的方式

 1 @RestController
 2 @RequestMapping(value = "/hello")
 3 public class HelloSpringBoot {
 4 
 5     @Autowired
 6     private PeoplePerties peoplePerties;
 7 
 8     @RequestMapping(value={"/say"})
 9     public String say(){
10         return peoplePerties.getName()+"====="+peoplePerties.getAge();
11 //        return "index";
12     }
13 }

 

9.效果

　　

 

二：

1.註解

　　

 

2.PathVariable的使用

 1 @RestController
 2 @RequestMapping(value = "/hello")
 3 public class HelloSpringBoot {
 4 
 5     @Autowired
 6     private PeoplePerties peoplePerties;
 7 
 8     @RequestMapping(value={"/say/{id}"})
 9     public String say(@PathVariable("id") Integer id){
10         return "id:"+id;
11 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
12 //        return "index";
13     }
14 }

 

3.效果

　　看起來url特別簡潔。

　　

 

4.RequestParam的使用

　　這個針對的是？=這種url

 1 @RestController
 2 @RequestMapping(value = "/hello")
 3 public class HelloSpringBoot {
 4 
 5     @Autowired
 6     private PeoplePerties peoplePerties;
 7 
 8     @RequestMapping(value={"/say"})
 9     public String say(@RequestParam("id") Integer myId){
10         return "id:"+myId;
11 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
12 //        return "index";
13     }
14 }

 

5.效果

　　

 

6.設置默認值

 1 @RestController
 2 @RequestMapping(value = "/hello")
 3 public class HelloSpringBoot {
 4 
 5     @Autowired
 6     private PeoplePerties peoplePerties;
 7 
 8     @RequestMapping(value={"/say"})
 9     public String say(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myId){
10         return "id:"+myId;
11 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
12 //        return "index";
13     }
14 }

 

7.效果

　　

 

8.GetMapping的使用

　　簡化RequestMapping

 1 @RestController
 2 @RequestMapping(value = "/hello")
 3 public class HelloSpringBoot {
 4 
 5     @Autowired
 6     private PeoplePerties peoplePerties;
 7 
 8 //    @RequestMapping(value={"/say"},method = RequestMethod.GET)
 9     @GetMapping(value = "/say")
10     public String say(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myId){
11         return "id:"+myId;
12 //        return peoplePerties.getName()+"====="+peoplePerties.getAge();
13 //        return "index";
14     }
15 }

 

9.效果