AJAX跨域訪問通訊代理，java中的實現

AJAX跨域訪問通訊代理在網上也說的很多，大多都是用asp.net或php寫的
俺沒用過DWR不知道有沒有實現跨域通訊的執行個體，所以自己在網上查資料寫了個這個，也算解了當前的燃眉之急
裡面的編碼是為JAVA工程和網站資料交換設定的，具體的編碼應看情況設定

應用串連:

http://192.168.1.8:8888/servlet/com.stone.common.AJAXProxy?x=a&y=b&url=http://www.xxx.com/pagesild/testpage.asp

 

package com.stone.common;

import java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class AJAXProxy extends HttpServlet...{
    protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException ...{
        doGet(req, res);
    }
    
    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException ...{
        req.setCharacterEncoding("UTF-8");
        res.setCharacterEncoding("gb2312");
        res.setContentType("text/html");
        PrintWriter out=res.getWriter();
        String mac;
        String url=null;
        StringBuffer params=new StringBuffer();
        Enumeration enu = req.getParameterNames();
        int total = 0;
        
        while (enu.hasMoreElements()) ...{
            
            // 取得參數名稱列表
            String paramName=(String)enu.nextElement();
            // 處理本請求參數以及發送給第三方伺服器的參數
            if(paramName.equals("url"))...{
                // 第三方伺服器位址
                url=req.getParameter(paramName);
            }else...{
                if(total==0)...{
                    params.append(paramName).append("=").append(URLEncoder.encode(req.getParameter(paramName), "UTF-8"));
                } else ...{
                    params.append("&").append(paramName).append("=").append(URLEncoder.encode(req.getParameter(paramName), "UTF-8"));
                }
                ++total;
            }
        }
        
        if(url != null)...{
            // 使用POST方式向目的伺服器發送請求
            URL connect = new URL(url.toString());
            URLConnection connection = connect.openConnection();
            connection.setDoOutput(true);
            
            OutputStreamWriter paramout = new OutputStreamWriter(connection.getOutputStream());
            paramout.write(params.toString());
            paramout.flush();

            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "gb2312"));
            String line;
            StringBuffer dataSend=new StringBuffer();
            while((line = reader.readLine()) != null)...{
                out.println(line);
                dataSend.append(line);
            }
            paramout.close();
            reader.close();
        }
    }
}