SpringBoot-Controller接收参数的几种常用方式

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

例子

GET 
http://localhost:8080/demo/123?name=suki_rong 
对应的java代码:

1 @GetMapping("/demo/{id}")
2 public void demo(@PathVariable(name = "id") String id, @RequestParam(name = "name") String name) {
3   System.out.println("id="+id);
4   System.out.println("name="+name);
5 }

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
例子

对应的java代码:

1 @PostMapping(path = "/demo1")
2   public void demo1(@RequestBody Person person) {
3   System.out.println(person.toString());
4 }

 

输出结果:
name:suki_rong;age=18;hobby:programing

也可以是这样

1 @PostMapping(path = "/demo1")
2 public void demo1(@RequestBody Map<String, String> person) {
3     System.out.println(person.get("name"));
4 }

输出结果:
suki_rong

2、无注解

例子



对应的java代码:

1 @PostMapping(path = "/demo2")
2 public void demo2(Person person) {
3     System.out.println(person.toString());
4 }

输出结果:
name:suki_rong;age=18;hobby:programing

Person类

 1 public class Person {
 2 
 3     private long id;
 4     private String name;
 5     private int age;
 6     private String hobby;
 7 
 8     @Override
 9     public String toString(){
10         return "name:"+name+";age="+age+";hobby:"+hobby;
11     }
12 
13     // getters and setters
14 }

 

第三类:请求头参数以及Cookie

1、@RequestHeader

2、@CookieValue

例子


java代码:

1 @GetMapping("/demo3")
2 public void demo3(@RequestHeader(name = "myHeader") String myHeader,
3         @CookieValue(name = "myCookie") String myCookie) {
4     System.out.println("myHeader=" + myHeader);
5     System.out.println("myCookie=" + myCookie);
6 }

也可以这样

1 @GetMapping("/demo3")
2 public void demo3(HttpServletRequest request) {
3     System.out.println(request.getHeader("myHeader"));
4     for (Cookie cookie : request.getCookies()) {
5         if ("myCookie".equals(cookie.getName())) {
6             System.out.println(cookie.getValue());
7         }
8     }
9 }

 



posted on 2019-11-19 10:05  小宁526  阅读(341)  评论(0编辑  收藏  举报