java socket 模拟http请求问题 - JAVA

Socket s = new Socket("www.pconline.com.cn",80);
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream(),"GBK"));
OutputStream out = s.getOutputStream();
StringBuffer sb = new StringBuffer("GET /index.html HTTP/1.1\r\n");
sb.append("User-Agent: Java/1.6.0_20\r\n");
sb.append("Host: www.pconline.com.cn:80\r\n");
sb.append("Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\n");
sb.append("Connection: Close\r\n");
sb.append("\r\n");
out.write(sb.toString().getBytes());
String tmp = "";
while((tmp = br.readLine())!=null){
System.out.println(tmp);
}
out.close();
br.close();

} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} www.2cto.com
try {

Socket s = new Socket("www.pconline.com.cn",80);
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream(),"GBK"));
OutputStream out = s.getOutputStream();
StringBuffer sb = new StringBuffer("GET /index.html HTTP/1.1\r\n");
sb.append("User-Agent: Java/1.6.0_20\r\n");
sb.append("Host: www.pconline.com.cn:80\r\n");
sb.append("Accept: text/ html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\n");
sb.append("Connection: Close\r\n");
sb.append("\r\n");
out.write(sb.toString().getBytes());
String tmp = "";
while((tmp = br.readLine())!=null){
System.out.println(tmp);
}
out.close();
br.close();

} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}