@RequestParam，@PathVariable

向右看齐 2022-04-04 05:46 272阅读 0赞

**`@RequestParam` 和 `@PathVariable` 注解都是用于从request中接收请求，两个都可以接收参数，**

### 不同：`@RequestParam` 从request里面拿取值，`@PathVariable` 从一个URI模板里面来填充 ###

**演示：**

Request URL:http://api.baidu.com/api/item/spec/groups?param1=3&param2=4

### ***`@RequestParam` 是从request里面拿取值，*** ###

public String getDetails(
        @RequestParam(value="param1", required=true) String param1,
            @RequestParam(value="param2", required=false) String param2){
    ...
    }

### ***`@PathVariable` 是从一个URI模板里面来填充*** ###

Request URL:http://api.baidu.com/api/item/spec/groups/79

@RestController
    @RequestMapping("spec")
    public class SpecificationController {
    
        @Autowired
        private SpecificationService specificationService;
    
        @GetMapping("groups/{cid}")
        public ResponseEntity<List<SpecGroup>> querySpecGroups(@PathVariable("cid") Long cid){
            List<SpecGroup> list = this.specificationService.querySpecGroups(cid);
            if(list == null || list.size() == 0){
                return new ResponseEntity<>(HttpStatus.NOT_FOUND);
            }
            return ResponseEntity.ok(list);
        }
    }

@RequestParam，@PathVariable

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