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 }