SpringBoot Controller接收参数的方式，@RequestParam，@PathVariable，@RequestBody

Bertha 。 2021-09-04 05:38 403阅读 0赞

> 慢慢的思考与总结，终会让你看到不一样的风景

**第一类：请求路径参数**

**1、@PathVariable 获取路径参数。即url/\{id\}这种形式。**

**2、@RequestParam 获取查询参数。即url?name=这种形式**

例：  
GET[http://localhost:8080/demo/123?name=suki\_rong][http_localhost_8080_demo_123_name_suki_rong]  
对应的java代码：

@GetMapping("/demo/{id}")
    public void demo(@PathVariable(name = "id") String id, @RequestParam(name = "name") String name) { 
     System.out.println("id="+id);
     System.out.println("name="+name);
    }

输出结果：  
id=123  
name=suki\_rong

**第二类：Body参数**

因为是POST请求，这里用Postman的截图结合代码说明

## 1、@RequestBody ##

### 例： ###

![demo1][]

对应的java代码：

@PostMapping(path = "/demo1")
    public void demo1(@RequestBody Person person) { 
     System.out.println(person.toString());
    }

输出结果：  
name:suki\_rong;age=18;hobby:programing

也可以是这样

@PostMapping(path = "/demo1")
    public void demo1(@RequestBody Map<String, String> person) { 
     System.out.println(person.get("name"));
    }

输出结果：  
suki\_rong

## 2、无注解 ##

### 例： ###

![demo2][]

对应的java代码：

@PostMapping(path = "/demo2")
    public void demo2(Person person) { 
     System.out.println(person.toString());
    }

输出结果：  
name:suki\_rong;age=18;hobby:programing

**Person类**

public class Person { 
    
     private long id;
     private String name;
     private int age;
     private String hobby;
    
     @Override
     public String toString(){ 
     return "name:"+name+";age="+age+";hobby:"+hobby;
     }
    
     // getters and setters
    }

#  #

## 第三类：请求头参数以及Cookie：@RequestHeader ，@CookieValue ##

### 例： ###

java代码：

@GetMapping("/demo3")
    public void demo3(@RequestHeader(name = "myHeader") String myHeader,
     @CookieValue(name = "myCookie") String myCookie) { 
     System.out.println("myHeader=" + myHeader);
     System.out.println("myCookie=" + myCookie);
    }

也可以这样

@GetMapping("/demo3")
    public void demo3(HttpServletRequest request) { 
     System.out.println(request.getHeader("myHeader"));
     for (Cookie cookie : request.getCookies()) { 
     if ("myCookie".equals(cookie.getName())) { 
     System.out.println(cookie.getValue());
     }
     }
    }

[http_localhost_8080_demo_123_name_suki_rong]: http://localhost:8080/demo/123?name=suki_rong
[demo1]: /images/20210813/955f2b78662d4c68953f9ba7f1818e5d.png
[demo2]: /images/20210813/e78f87def4ed408aa7cac663e1cb1b8c.png