急求SOCKET代码 要求发送到指定IP和端口 然后接收到返回字段 会话结束！该怎么处理

import java.io.*;import java.net.*;public class TestSocket {    public static void main(String[] args) {    String result = getResult("www.china.com", 80);    System.out.println(result);    }        public static String getResult(String ip, int port) {    Socket socket = null;    BufferedReader bufferedReader = null;    StringBuffer result = null;    try {                //建立连接        socket = new Socket(ip, port);        bufferedReader = new BufferedReader(new InputStreamReader(socket            .getInputStream(), "GBK"));        //发出请求        OutputStream out = socket.getOutputStream();        StringBuffer stringBuffer = new StringBuffer(            "GET /index.html HTTP/1.1\r\n");        stringBuffer.append("User-Agent: Java/1.6.0_20\r\n");        //Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR        stringBuffer.append("Host: www.pconline.com.cn:80\r\n");        stringBuffer            .append("Accept: text/html\r\n");//取html文本内容        stringBuffer.append("Connection: Close\r\n");        stringBuffer.append("\r\n");        out.write(stringBuffer.toString().getBytes());        //取得相应        result = new StringBuffer();        String tempString = null;        while ((tempString = bufferedReader.readLine()) != null) {        result.append(tempString);        result.append("\r\n");        }    } catch (IOException e) {        e.printStackTrace();    } finally {        try {        if (bufferedReader != null)            bufferedReader.close();        if (socket != null)            socket.close();        } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();        }    }    return result.toString();    }}