详解SpringBoot Controller接收参数的几种常用方式
人气:3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:
@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
例子
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
例子
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
1、@RequestHeader
2、@CookieValue
例子
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()); } } }
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