@RequestParam，@PathVariable

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@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);
    }
}