spring 如何在RequestDispatcher转发后获取请求和响应字符串

mwg9r5ms 于 2023-04-28 发布在 Spring

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在我的Springboot应用程序中，我使用RequestDispatcher forward将请求和响应发送到远程服务。现在我需要得到response和request作为字符串来记录到数据库。request和response都包含JSON数据。

RequestDispatcher requestDispatcher = request.getRequestDispatcher(configAPI.getUserByPhoneUrl());
requestDispatcher.forward(request, response);

RequestDispatcher将就地修改响应。因此，在forward()函数之后，我无法从requestDispatcher.forward(request, response)创建的响应中获取json。

@RequestMapping(value = "/getUserByPhone", method = {RequestMethod.GET}, produces = "application/json;charset=utf-8")
    public void getUserbyIsdn(HttpServletRequest request, HttpServletResponse response) {
            // Forward the request to the remote service
            RequestDispatcher requestDispatcher = request.getRequestDispatcher(configAPI.getUserByPhoneUrl());
            requestDispatcher.forward(request, response);
            // response now has result from remote service
            // TODO: print out json in response here
    }

有没有关于如何获得响应作为json的想法？
我尝试使用HttpServletResponseWrapper访问响应，但无法访问。使用HttpServletResponseWrapper的示例代码：

HttpServletRequestWrapper requestWrapper = new HttpServletRequestWrapper(request);
            HttpServletResponseWrapper responseWrapper = new HttpServletResponseWrapper(response);

            // Forward the request to the remote service
            request.getRequestDispatcher(configAPI.getUserByPhoneUrl()).forward(requestWrapper, responseWrapper);

但由于未设置ApplicationContext请求，因此导致NullPointerException。

spring

来源：https://stackoverflow.com/questions/76004120/how-to-get-request-and-response-as-string-after-requestdispatcher-forward

1条答案

按热度按时间

0yg35tkg1#

经过一些尝试，我能够使用ContentCachingRequestWrapper和ContentCachingResponseWrapper获得响应并请求json字符串。控制器现在变成这样：

@RequestMapping(value = "/getUserByPhone", method = {RequestMethod.GET}, produces = "application/json;charset=utf-8")
    public void getUserbyIsdn(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
        ContentCachingRequestWrapper requestWrapper = new ContentCachingRequestWrapper(request);
        ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
        requestWrapper.getRequestDispatcher(configAPI.getApi_getUserbyIsdn_user()).forward(requestWrapper, responseWrapper);
        // do what ever you want here with response and request
        apiLogService.addApiLog(requestWrapper, responseWrapper, "getUserByIsdn", timer);

        // have to has this to return original response of other service
        responseWrapper.copyBodyToResponse();
    }

函数addApiLog：

public void addApiLog(ContentCachingRequestWrapper request, ContentCachingResponseWrapper response) {
    String requestJson = IOUtils.toString(request.getContentAsByteArray());
    String responseJson = IOUtils.toString(response.getContentAsByteArray());
    // handle json String using JSONObject or GSON as needed
}

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spring 如何在RequestDispatcher转发后获取请求和响应字符串

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