Socket client = null;
try{
client = new Socket(Ip,Port);
String msg="发送的数据内容！";
//得到socket读写流,向服务端程序发送数据 
client.getOutputStream().write(msg.getBytes());
byte[] datas = new byte[2048];
//从服务端程序接收数据
client.getInputStream().read(datas);
System.out.println(new String(datas));
}catch(Exception e){
e.printStackTrace();
}finally {
if (client != null) {
try {
client.close();
} catch (IOException e) {
System.out.println("systemerr:" +e);
}
}
}

try{
client = new Socket();
SocketAddress socketAddress = new InetSocketAddress(Ip,Port);
client.connect(socketAddress, 3000);
String msg="访问的服务器返回内容！";
//得到socket读写流,向服务端程序发送数据 
client.getOutputStream().write(msg.getBytes());
byte[] datas = new byte[2048];
//从服务端程序接收数据
client.getInputStream().read(datas);
System.out.println(new String(datas));
}catch(Exception e){
e.printStackTrace();
}finally {
if (client != null) {
try {
client.close();
} catch (IOException e) {
System.out.println("systemerr:" +e);
}
}
}

try { 
//1.建立客户端socket连接，指定服务器位置及端口 
Socket socket =new Socket(Ip,Port); 
//2.得到socket读写流 
OutputStream os=socket.getOutputStream(); 
PrintWriter pw=new PrintWriter(os); 
//输入流 
InputStream is=socket.getInputStream(); 
BufferedReader br=new BufferedReader(new InputStreamReader(is)); 
//3.利用流按照一定的操作，对socket进行读写操作 
String sendInfo="向服务器发送的数据信息！";
pw.write(sendInfo); 
pw.flush(); 
socket.shutdownOutput(); 
//接收服务器的相应 
String replyInfo=null; 
while(!((replyInfo=br.readLine())==null)){ 
System.out.println("接收服务器的数据信息："+replyInfo); 
} 
//4.关闭资源 
br.close(); 
is.close(); 
pw.close(); 
os.close(); 
socket.close(); 
} catch (UnknownHostException e) { 
e.printStackTrace(); 
} catch (IOException e) { 
e.printStackTrace(); 
}