Question

如何在到达spring控制器之前修改请求体中发送的JSON对象？

我尝试添加过滤器，但是一旦从请求中读取（servletrequest.getReader（））然后将请求转发到过滤器链中的下一个过滤器，它就会失败（请求不会到达控制器）。

BufferedReader reader = servletrequest.getReader();
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line);
String data = buffer.toString();

使用这个我在字符串中得到了JSON，但是我无法弄清楚如何将它放回请求中。

Answer 1

使用Spring的HandlerInterceptor。您还可以专门选择拦截特定请求。检查this tutorial。这完全取决于您使用的Spring版本。但是这应该会让您对如何实现它有一个公平的展望。

package com.test.intercept;


import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONArray;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;



public class HttpRequestInterceptor extends HandlerInterceptorAdapter {


@Autowired
private ServletContext context;

@Override
public boolean preHandle(HttpServletRequest request,
        HttpServletResponse response, Object handler) throws Exception {
    HandlerMethod handlerMethod = (HandlerMethod) handler;
    String methodName = handlerMethod.getMethod().getName();
    Map<String, String> headerMap = HttpUtil.getAllHeaders(request);
    Boolean isAllowed=false;

    //doing what you want to your json
    //
    return isAllowed;
}

@Override
public void afterCompletion(HttpServletRequest arg0,
        HttpServletResponse arg1, Object arg2, Exception arg3)
        throws Exception {
    logger.info("in after completion");

}

@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
        Object arg2, ModelAndView arg3) throws Exception {
    logger.info("in posthandle");

}

并在您的servletContext.xml中添加：

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/api/**" /> <!--to exclude a path -->
        <mvc:exclude-mapping path="/web/**" /> <!--to exclude a path -->
        <beans:bean class="com.test.interceptor.HttpRequestInterceptor"></beans:bean>
    </mvc:interceptor>
</mvc:interceptors>

如何在到达spring控制器之前修改请求体中从UI端发送的JSON对象？

1 个答案: