将 JSON POST 请求从一个 REST API 转发到另一个

Question

我有以下情况：

我的 REST API 之一：

@RestController
@RequestMapping("/controller1")
Public Class Controller1{
    @RequestMapping(method = RequestMethod.POST)
    public void process(@RequestBody String jsonString) throws InterruptedException, ExecutionException 
    {
       ............
    }
}

用于 REST API(Controller1) 的 JSON POST 请求，request1：

{
  "key1":"value1",
  "key2":"value2"
}

我的 REST API 二：

@RestController
@RequestMapping("/controller2")
Public Class Controller2{
    @RequestMapping(method = RequestMethod.POST)
    public void process(@RequestBody String jsonString) throws InterruptedException, ExecutionException 
    {
       ............
    }
}

用于 REST API(Controller2) 的 JSON 请求，request2：

{
  "key1":"value1",
  "key2":"value2",
  "key3":"value3"
}

我有几个这样的“原始”请求。 现在，我期待一个 JSON 请求，我们称之为 request3，它是此类“原始”查询的组合——如下所示：

{
   {
      "requestType":"requestType1",
      "request":"[{"key1":"value1","key2":"value2"}]"
   },
   {
      "requestType":"requestType2",
      "request":"[{"key1":"value1","key2":"value2","key3":"value3"}]"
   }
}

在这里，我需要在识别查询类型时触发相应的 API（一个或两个）。我想知道如何将请求转发到相应的 REST API。我为 request3 编写了 REST API，如下所示：

@RestController
@RequestMapping("/controller3")
Public Class Controller3{
    @RequestMapping(method = RequestMethod.POST)
    public void process(@RequestBody String jsonString) throws InterruptedException, ExecutionException 
    {
      ..................
      ..................

      switch(request){
         case request1: //how to call REST API 1?
         case request2: //how to call REST API 2?
      }
    }
}

Answer 1

您可以调用一个实用方法，使用下面的 Rest Template 将请求发布到控制器。由于您使用的是 POST 方法，因此使用 Rest Template 发送参数很容易。您可能需要稍微编辑此代码才能在您的环境中使用准确的语法。

@RequestMapping( value= "/controller3" method = RequestMethod.POST)
 public @ResponseBody void process(@RequestBody String jsonString){

    String request = requestType //Get the request type from request
    String url = "";
    MultiValueMap<String, String> params= null;
    switch(request){
         case request1: //how to call REST API 1?
            url = "/controller1";
            params = request1param //Get the parameter map from request 
         case request2: //how to call REST API 2?
            url = "/controller2";
            params = request2Param //Get the parameter map from request 
      }

      //Now call the method with parameters
      getRESTResponse(url, params);

  }

  private String getRESTResponse(String url, MultiValueMap<String, String> params){
     RestTemplate template = new RestTemplate();
     HttpEntity<MultiValueMap<String, String>> requestEntity= 
            new HttpEntity<MultiValueMap<String, String>>(params);
    String response = "";
     try{
        String responseEntity = template.exchange(url, HttpMethod.POST, requestEntity,  String.class);
        response = responseEntity.getBody();
    }
    catch(Exception e){
        response = e.getMessage();
    }
    return response;
  }

Redirect from one controller method to another controller method

或者，您也可以使用 Rest Template 调用 rest 方法 Spring MVC - Calling a rest service from inside another rest service

您可以在这篇文章中找到如何使用参数发送 POST 请求 https://techie-mixture.blogspot.com/2016/07/spring-rest-template-sending-post.html