用AjaxProxyServlet 跨域ajax请求

关键字:   java ajax    

老庄的代码里用了DataInputStream，这个类的readLine()不被推荐使用，所以换成了InputStreamReader
添加了代码来处理Ajax请求中的参数。
java 代码

/*
 * Created on 2007-1-16
 */
import javax.servlet.http.HttpServlet;
                
                import java.io.BufferedReader;
                import java.io.IOException;
                import java.io.InputStreamReader;
                import java.io.PrintWriter;
                
                import java.net.URL;
                
                import java.util.Enumeration;
                
                import javax.servlet.ServletException;
                import javax.servlet.http.HttpServletRequest;
                import javax.servlet.http.HttpServletResponse;
                
                public class AjaxProxyServlet extends HttpServlet {
                    protected void service(HttpServletRequest req, 
                                           HttpServletResponse resp) throws ServletException, 
                                                                            IOException {
                        resp.setContentType("text/html");
                        PrintWriter pw = resp.getWriter();
                        Enumeration paramNames = req.getParameterNames();
                        StringBuffer bfParams = new StringBuffer();
                        bfParams.append(req.getParameter("url")).append("?1=1");
                        while(paramNames.hasMoreElements()) {
                            String param = (String)paramNames.nextElement();
                            if("url".equals(param)){continue;}
                            bfParams.append("&").append(param).append("=").append(req.getParameter(param));
                        }
                        
                        URL url = new URL(bfParams.toString());
                        BufferedReader bf = 
                            new BufferedReader(new InputStreamReader(url.openStream()));
                        String line;
                        while ((line = bf.readLine()) != null) {
                            pw.println(line);
                        }
                        bf.close();
                    }
                }