在做项目的API通知接口的时候，发现在SSH框架中无法获取到对方服务器发来的异步通知信息。
最后排查到的原因可能是struts2对HttpServletRequest进行了二次处理，那么该如何拿到post的请求数据呢，方法很多，下面只给出一种方式。
在servlet中GET请求可以通过HttpServletRequest的getRequestURL方法和getQueryString()得到完 整的请求路径和请求所有参数列表，
POST的需要getParameterMap()方法遍历得到，不论GET或POST都可以通过 getRequestURL+getParameterMap()来得到请求完整路径。
package com.xxx import java.io.IOException;import java.io.PrintWriter;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class GetParams extends HttpServlet {private static final long serialVersionUID = 1L;public GetParams() {super();}protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {PrintWriter writer = response.getWriter();writer.println("GET " + request.getRequestURL() + " "+ request.getQueryString());Map<String, String[]> params = request.getParameterMap();String queryString = "";for (String key : params.keySet()) {String[] values = params.get(key);for (int i = 0; i < values.length; i++) {String value = values[i];queryString += key + "=" + value + "&";}}// 去掉最后一个空格queryString = queryString.substring(0, queryString.length() - 1);writer.println("GET " + request.getRequestURL() + " " + queryString);}protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {PrintWriter writer = response.getWriter();Map<String, String[]> params = request.getParameterMap();String queryString = "";for (String key : params.keySet()) {String[] values = params.get(key);for (int i = 0; i < values.length; i++) {String value = values[i];queryString += key + "=" + value + "&";}}// 去掉最后一个空格queryString = queryString.substring(0, queryString.length() - 1);writer.println("POST " + request.getRequestURL() + " " + queryString);}}
根据上面的代码，稍微改动一下，实现如下：
/*** 获取POST数据,不支持数组形式数据,一般使用场景是对方使用POST方式传递数据过来* TODO 待完善* @author phpdragon* @date -12-24 下午3:45:22* @return* @description :* @return Map<String,String>* @throws*/@SuppressWarnings("unchecked")private static Map<String, String> getPostData() {Map<String, String> param = new HashMap<String, String>();HttpServletRequest request = ServletActionContext.getRequest();Map<String, String[]> params = request.getParameterMap();for (String key : params.keySet()) {String[] values = params.get(key);for (int i = 0; i < values.length; i++) {param.put(key, values[i]);}}return param;}
虽然有所不足，但对于手上的项目中API接口场景已经满足需求了。
