Spring boot http POST @RequestParam 多参数

Question

我有一个弹簧靴admin server 和一个angular-client 前部。我正在尝试使用 HTTPClient 将一些数据从我的前端发送到我的服务器，但不知何故，我在请求期间收到以下错误，但首先是我的代码：

angular-client 中的 POST 请求：

  runBatch(id: number, stateUpd: string): Observable<HttpEvent<{}>> {
    const req = new HttpRequest('POST', '/update_state', {id, stateUpd}, {
      reportProgress: true,
      responseType: 'text'
    });
    return this.http.request(req);
  }

angular-client 中的控制器：

changeBatchState(state: string): void {
        if(this.selection.selected.length >= 1){
            this.selection.selected.forEach(batchInstance =>{
                if(batchInstance.batchState == 'CRASHED' || 'KILLED' || 'SUBMITTED'){
                    console.log(batchInstance.id + " setting to RUNNABLE...");
                    this.dataTableService.runBatch(batchInstance.id, state).subscribe(event => {
                        if(event.type === HttpEventType.UploadProgress) {
                         console.log('POST /update_state sending...');   
                        }
                        else if(event instanceof HttpResponse) {
                         console.log('Request completed !');   
                        }
                    });
                }
                else {
                    console.log(batchInstance.id + ' can not set to RUNNABLE');
                }
            });
        }
    }

admin server 中的控制器：

    @PostMapping("/update_state")
    public ResponseEntity<String> batchChangeState(@RequestParam("id") int id, @RequestParam("stateUpd") String stateUpd) {
        try {
            log.i("INSIDE CONTROLLER");
            log.i("BATCH INSTANCE ID : " + id);
            log.i("UPDATE REQUESTED : " + stateUpd);

        return ResponseEntity.status(HttpStatus.OK).body("Batch instance: " + id + " updated");
        } catch (Exception e) {

        return ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body("Fail to update batch instance " + id);
        }
    }

这里是我在请求期间得到的错误：

ERROR 
Object { headers: {…}, status: 400, statusText: "OK", url: "http://localhost:8870/update_state", ok: false, name: "HttpErrorResponse", message: "Http failure response for http://localhost:8870/update_state: 400 OK", error: "{\"timestamp\":1517473012190,\"status\":400,\"error\":\"Bad Request\",\"exception\":\"org.springframework.web.bind.MissingServletRequestParameterException\",\"message\":\"Required int parameter 'id' is not present\",\"path\":\"/update_state\"}" }

我不明白它来自哪里，因为我在我的 POST 请求中正确发送了 id，有什么想法吗？

Answer 1

const req = new HttpRequest('POST', '/update_state', {id, stateUpd}, {

将创建一个请求，其中 {id, stateUpd} 在正文中，而不是在 queryParams 中。

你应该这样做

// change : Body = null, and data are in options.params    
runBatch(id: number, stateUpd: string): Observable<HttpEvent<{}>> {
        const req = new HttpRequest('POST', '/update_state', null, {
          reportProgress: true,
          responseType: 'text',
          params: new HttpParams().set('id', id.toString()).set('stateUpd', stateUpd);
        });
        return this.http.request(req);
      }