SSH 获取GET/POST参数

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 2014-12-24 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。