Java Socket Communication (1) Client Program to Send and Receive Data

Network applications are divided into two parts: client and server, and the Socket class is the Java class responsible for handling client communication. Through this class, you can connect to a server with a specified IP or domain name, and can send and receive data to and from the server.

For a brief description of Socket communication, the server writes things into the Socket output stream, and the client can read the corresponding content through the Socket input stream. There is a two-way connection between Socket and Socket, so the client can also write things into the corresponding Socket output stream, and then the corresponding Socket input stream on the server can read the corresponding content.

Example 1: Abbreviation of client (1).

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);
}
}
}

Example 2: Client abbreviation (2).

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);
}
}
}

Example 3: The complete writing method of the client.

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(); 
}

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