spring boot基础之GetMapping

1 @Target(ElementType.METHOD)
2 @Retention(RetentionPolicy.RUNTIME)
3 @Documented
4 @RequestMapping(method = RequestMethod.GET)
5 public @interface GetMapping {

GetMapping 注解已经默认封装了@RequestMapping(method = RequestMethod.GET)

所以，比前文 使用 @RequestMapping(path = "/{city_id}/{user_id}",method = RequestMethod.GET) 更方便

 1 mport org.springframework.web.bind.annotation.*;
 2 
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 
 6 @RestController
 7 public class GetController {
 8 
 9     private Map<String,Object> map = new HashMap<>();
10 
11     
12 
13     @GetMapping("/v2/request")
14     public Object testPage1(int from,int size){
15         map.clear();
16         map.put("from",from);
17         map.put("size",size);
18         return  map;
19     }
20 
21     @GetMapping("/v2/request_page")
22     public Object testPage2(@RequestParam(defaultValue = "0",name = "page") int from,int size){
23         map.clear();
24         map.put("from",from);
25         map.put("size",size);
26         return  map;
27     }
28 }

可以使用@RequestParam添加默认值，设置别名。

二 获取请求头信息

1 @GetMapping("/v2/get_header")
2     public Object getHeader(@RequestHeader("mytoken") String mytoken ,String id){
3         map.clear();
4         map.put("token",mytoken);
5         map.put("id",id);
6         return  map;
7 
8     }

三  使用 HttpServletRequest 获取请求信息

1 @GetMapping("/v2/get_servlet")
2     public Object testServlet(HttpServletRequest request){
3 
4         map.clear();
5         map.put("id",request.getParameter("id"));
6         return  map;
7 
8     }