ServerSocket

创建套接字

ServerSocket serverSocket = new ServerSocket(9688);

9688是服务端需要监听的端口号

监听

serverSocket.accept();

等待客户端的连接，这个方法是一直阻塞的，知道客户端连接上来，建立一个长连接，连接一直维护致一端断开连接

完整的服务端代码

package io.bio;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
/**
 * 服务端代码
 * 
 * @author linguo
 *
 */
public class ServerSocketDemo {
    /**
     * 处理连接
     * 
     * @param socket
     * @throws Exception
     */
    private static void process(Socket socket) throws Exception {
        // 读io
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        // 写io
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        // 读取
        String readLine = reader.readLine();
        // 读取到的内容写给客户端
        writer.write(readLine);
        writer.newLine();
        writer.flush();
    }
    public static void main(String[] args) throws IOException {
        // 创建套接字
        ServerSocket serverSocket = new ServerSocket(9688);
        while (true) {
            // 循环监听
            Socket clientSocket = serverSocket.accept();
            try {
                System.err.println("新连接:" + clientSocket.getRemoteSocketAddress());
                process(clientSocket);
            } catch (Exception e) {
                e.printStackTrace();
                serverSocket.close();
            }
        }
    }
}