客户端：

import java.net.Socket; 

import java.net.InetAddress;  import java.net.UnknownHostException;  import java.io.OutputStream;  import java.io.BufferedReader;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.PrintWriter;  import java.io.IOException;  public class TcpClient {      public static void main(String[] args) throws IOException {          try {              byte a[] = { 127,0,0,1 };              InetAddress address = InetAddress.getByAddress(a);              Socket socket = new Socket(address,9876);              OutputStream os = socket.getOutputStream();              PrintWriter out = new PrintWriter(os,true);              InputStream is = socket.getInputStream();              InputStreamReader isr = new InputStreamReader(is);              BufferedReader in = new BufferedReader(isr);              String line;              line = "A line sent by the client";              out.println(line);              line = in.readLine();              System.out.println("client got: " + line);              out.close();              in.close();              socket.close();          } catch (UnknownHostException e) {              System.out.println(e);          } catch (IOException e) {              System.out.println(e);          }      }  }

服务器端：

import java.net.ServerSocket; 

import java.net.Socket;  import java.io.BufferedReader;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.IOException;  import java.io.OutputStream;  import java.io.PrintWriter;  public class TcpServer {      public static void main(String[] args) {          try {              ServerSocket serverSocket = new ServerSocket(9876);              Socket socket = serverSocket.accept();  /*和Client一样了*/              InputStream is = socket.getInputStream();              InputStreamReader isr = new InputStreamReader(is);              BufferedReader in = new BufferedReader(isr);              OutputStream os = socket.getOutputStream();              PrintWriter out = new PrintWriter(os,true);              String line;              while((line = in.readLine()) != null) {                   System.out.println("server got: " + line);                   line = "A line sent by the server";                   out.println(line);              }              out.close();              in.close();              socket.close();              serverSocket.close();          } catch (IOException e) {              System.out.println(e);              System.exit(1);          }      }  }

 

本文转自gnuhpc博客园博客，原文链接：http://www.cnblogs.com/gnuhpc/archive/2012/12/17/2822297.html，如需转载请自行联系原作者