java socket

访问客户端编程，下面是访问某网站返回的（HTML）代码：

例子1：
public class SocketClient {

Socket socket;

public SocketClient() {

}

public String SocketClientStr() {
String str = "";

StringBuffer sb = new StringBuffer();

BufferedReader in = null;

String def = "gzip, ";

try {

            URL urlmy = new URL("//http://www.***.com/");
           
            HttpURLConnection con = (HttpURLConnection) urlmy.openConnection();
           
            con.setFollowRedirects(true);
            con.setInstanceFollowRedirects(true);
            con.connect();
           
BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));

while((str = reader.readLine()) != null){
sb.append(str);
System.out.println(str);
str = reader.readLine();
}

socket.close();
in.close();
reader.close();


} catch (Exception e) {
e.printStackTrace();
}
return sb.toString();
}

public static void main(String[] args) {
SocketClient n = new SocketClient();
System.out.println(n.SocketClientStr());
}

例子2：
public class SocketClient2 {

public static void main(String[] args){
try{

String sendHead = "GET / HTTP/1.1\r\n"
            + "Accept: */*\r\n"
            + "Accept-Language: zh-cn\r\n"
            + "Accept-Encoding: deflate\r\n"
            + "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n"
            + "Host: www.baidu.com\r\n"
        + "Connection: Keep-Alive\r\n"
            + "Cookie: BAIDUID=75E25D4C8085E5BEE50DB1CCB97489FB:FG=1\r\n\r\n";

  Socket   socket=new   Socket("121.14.88.76",80);
 
  BufferedReader   sin=new   BufferedReader(new   InputStreamReader(System.in));
 
  PrintWriter   os=new   PrintWriter(socket.getOutputStream());
 
  BufferedReader   is=new   BufferedReader(new   InputStreamReader(socket.getInputStream()));
 
  String   readline;
 
  readline=sin.readLine();   //从系统标准输入读入一字符串
 
  while(!readline.equals( "bye ")){
// os.println(readline);
 
//  os.flush();
 
  System.out.println( "Client: "+readline);
 
  System.out.println( "Server: "+is.readLine()); 
 
  readline=sin.readLine();   //从系统标准输入读入一字符串
}
  os.close();   //关闭Socket输出流
  is.close();   //关闭Socket输入流
  socket.close();   //关闭Socket
  }catch(Exception   e)   {
System.out.println("error is : " + e);
  }
}