Java编程实现多线程TCP服务器完整实例

 

Socket

·功能:TCP客户端套接字

·构造方法:

  Socket(InetAddress address, int port)

  创建一个流套接字并将其连接到指定 IP 地址的指定端口号

·常用方法:

  1.getInetAddress

  获得InetAddress的相关信息

  2.getInputStream

  获得此TCP连接的输入流

  3.getOutPutStream

  获得此TCP连接的输出流

ServerSocket

·功能: TCP服务端套接字

·构造方法:

  ServerSocket(int port)

  创建绑定到特定端口的服务器套接字。

·常用方法:

  1.accept

  获得TCP连接的客户端的socket

  2.isClosed

  获得ServerSocket的关闭状态

TCP服务器端

TcpServer.java

服务器端采用多线程的方式,每建立一个连接就启动一个java线程,发送图片给客户端,之后关闭此TCP连接

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.net.ServerSocket; import java.net.Socket; public class TcpServer extends Thread{     Socket clientSocket;     public TcpServer(Socket clientSocket) {         super();         this.clientSocket = clientSocket;     }     @Override       public void run() {         try {             //获得客户端的ip地址和主机名             String clientAddress = clientSocket.getInetAddress().getHostAddress();             String clientHostName = clientSocket.getInetAddress().getHostName();             System.out.println(clientHostName + "(" + clientAddress + ")" + " 连接成功!");             System.out.println("Now, 传输图片数据...........");             long startTime = System.currentTimeMillis();             //获取客户端的OutputStream             OutputStream out = clientSocket.getOutputStream();             //传出图片数据             FileInputStream in = new FileInputStream(new File("/home/gavinzhou/test.jpg"));             byte[] data = new byte[4096];             int length = 0;             while((length = in.read(data)) != -1){                 out.write(data, 0, length);                 //写出数据             }             long endTime = System.currentTimeMillis();             //提示信息             System.out.println(clientHostName + "(" + clientAddress + ")" + " 图片传输成功," + "用时:" + ((endTime-startTime)) + "ms");             //关闭资源             in.close();             clientSocket.close();             System.out.println("连接关闭!");         }         catch (IOException e) {             e.printStackTrace();         }     }     public static void main(String[] args) throws IOException {         //建立TCP连接服务,绑定端口         ServerSocket tcpServer = new ServerSocket(9090);         //接受连接,传图片给连接的客户端,每个TCP连接都是一个java线程         while(true){             Socket clientSocket = tcpServer.accept();             new TcpServer(clientSocket).start();         }     } }

　　

TCP客户端

TcpClient

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.InetAddress; import java.net.Socket; public class TcpClient {     public static void main(String[] args) throws IOException {         // 建立TCP服务         // 连接本机的TCP服务器         Socket socket = new Socket(InetAddress.getLocalHost(), 9090);         // 获得输入流         InputStream inputStream = socket.getInputStream();         // 写入数据         FileOutputStream out = new FileOutputStream(new File("../save.jpg"));         byte[] data = new byte[4096];         int length = 0;         while((length = inputStream.read(data)) != -1){             out.write(data, 0, length);         }         //关闭资源         out.close();         socket.close();     } }

　　

结果

首先,命令行启动服务器端,之后启动客户端,结果如下:

图片比较小,速度很快!