使用来自HTTP POST的响应进行Spring MVC重定向

Question

我需要使用Spring MVC重定向到一个外部服务，使用一个带有构建的对象的POST。

@RequestMapping(method = RequestMethod.GET, value = "/handoff")
public HttpEntity dispatch(HttpServletRequest request,
  @RequestParam(value = "referralURL", required = false) String referralUrl) {

    String redirectURL = "http://desinationURL.com/post";

    HttpClientHelper httpHelper = new HttpClientHelper();
    HttpEntity entity = httpHelper.httpClientPost(redirectURL, null);

    // Redirect
    return entity;
}

HttpClientHelper.java

public HttpEntity httpClientPost(String url, List<NameValuePair> params) throws ClientProtocolException, IOException {

    HttpClient httpclient = HttpClients.createDefault();
    HttpPost httppost = new HttpPost(url);

    // Request parameters and other properties.
    if (params != null) {
        httppost.setEntity(new UrlEncodedFormEntity(params, Constants.UTF_8_ENCODING));
    }

    // Execute and get the response.
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity entity = response.getEntity();

    return entity;

}

我可以看到目标服务正被POST请求成功命中，我需要从MCV控制器读取响应的输出作为返回值，因为它当前只返回一个404。

Answer 1

无法将浏览器重定向到POST请求的响应。您所能做的就是将调用的结果发回外部URL。或者以某种方式处理响应,然后转发到应用程序中显示有关响应的某些信息的其他页面。

例如。

@RequestMapping(method = RequestMethod.GET, value = "/handoff")
public void dispatch(HttpServletRequest request,
  @RequestParam(value = "referralURL", required = false) String referralUrl, HttpServletResponse response) {

    String redirectURL = "http://desinationURL.com/post";

    HttpClientHelper httpHelper = new HttpClientHelper();
    HttpEntity entity = httpHelper.httpClientPost(redirectURL, null);

    //streams the raw response
    entity.writeTo(response.getOutputSStream());
}