Java网络教程 - Java网络TCP客户端套接字
Socket 类表示一个TCP客户端套接字。
以下代码显示如何创建TCP客户端套接字：
// Create Socket for 192.168.1.2 at port 1234
Socket socket = new Socket("192.168.1.2", 1234);
以下代码显示如何创建未绑定的客户端套接字，绑定它并连接它。
Socket socket = new Socket();
socket.bind(new InetSocketAddress("localhost", 1234));
socket.connect(new InetSocketAddress("localhost", 1234));
在连接Socket对象之后，我们可以分别使用getInputStream()和getOutputStream()方法使用其输入和输出流。
例子
以下代码显示了基于TCP套接字的Echo客户端。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;public class Main {public static void main(String[] args) throws Exception {Socket socket = new Socket("localhost", 12900);System.out.println("Started client socket at "+ socket.getLocalSocketAddress());BufferedReader socketReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));BufferedWriter socketWriter = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));BufferedReader consoleReader = new BufferedReader(new InputStreamReader(System.in));String promptMsg = "Please enter a message (Bye to quit):";String outMsg = null;System.out.print(promptMsg);while ((outMsg = consoleReader.readLine()) != null) {if (outMsg.equalsIgnoreCase("bye")) {break;}// Add a new line to the message to the server,// because the server reads one line at a time.socketWriter.write(outMsg);socketWriter.write("\n");socketWriter.flush();// Read and display the message from the serverString inMsg = socketReader.readLine();System.out.println("Server: " + inMsg);System.out.println(); // Print a blank lineSystem.out.print(promptMsg);}socket.close();}
}