Java簡單實現(xiàn)UDP和TCP的示例

//服務(wù)端
public class TcpServer {
 public static void main(String[] args) throws IOException {
  ServerSocket serverSocket = new ServerSocket(8886); // 建立服務(wù)端，ip為本機ip,端口為8886
  Socket accept = serverSocket.accept(); // 監(jiān)聽客戶端的連接，一旦有客戶端連接，則會返回客戶端對應(yīng)的accept
  
  InputStream in = accept.getInputStream(); //獲取到客戶端的輸出流
  byte b[] = new byte[1024];
  int len = in.read(b);
  System.out.println("接受到客戶端數(shù)據(jù),返回數(shù)據(jù)"+new String(b,0,len)); 
  
  OutputStream out = accept.getOutputStream(); // 給客戶端發(fā)送消息
  out.write("服務(wù)端已經(jīng)接受".getBytes());
  
  serverSocket.close();
 }
}

// 客戶端
public class TcpClient {
 public static void main(String[] args) throws IOException {
  Socket socket = new Socket("127.0.0.1", 8886); // 通過Socket來建立和服務(wù)端的連接
  OutputStream out = socket.getOutputStream(); // 獲取輸出流（客戶端輸出流即向服務(wù)端輸出信息）
  out.write("hello tcp Server".getBytes()); // 輸出信息
  
  InputStream in = socket.getInputStream(); // 接受服務(wù)端的消息
  byte b[] = new byte[1024];
  int len = in.read(b);
  System.out.println("接受到服務(wù)器消息 ： "+new String(b,0,len)); // 輸出
  out.write("返回的的數(shù)據(jù)已經(jīng)收到 ".getBytes()); // 向服務(wù)器返回消息
  socket.close();
 }
}

// server
 public static void main(String[] args) throws IOException {
  ServerSocket serverSocket = new ServerSocket(8886); // 建立服務(wù)端，ip為本機ip,端口為8886
  int i=4;
  while(i>2){
   Socket accept = serverSocket.accept(); // 監(jiān)聽客戶端的連接，一旦有客戶端連接，則會返回客戶端對應(yīng)的accept
   
   ServerThread st = new ServerThread(accept); // 啟動線程
   Thread th = new Thread(st);
   th.start();
  }
  serverSocket.close();
 }

// thread

public class ServerThread implements Runnable {
 private Socket accept;
 public ServerThread(Socket s) {
  this.accept = s;
 }
 public void run(){
  InputStream in;
  try {
   in = accept.getInputStream();
   byte b[] = new byte[1024];
   int len = in.read(b);
   System.out.println("接受到客戶端數(shù)據(jù),返回數(shù)據(jù)" + new String(b, 0, len));
   OutputStream out = accept.getOutputStream(); // 給客戶端發(fā)送消息
   out.write("服務(wù)端已經(jīng)接受".getBytes());
  } catch (IOException e) {
   e.printStackTrace();
  } 
 }
}

// 服務(wù)端

public class Server {
 public static void main(String[] args) throws IOException {

  ServerSocket serverSocket = new ServerSocket(5555);
  Socket ss = serverSocket.accept();
  
  BufferedInputStream br = new BufferedInputStream(ss.getInputStream());

  BufferedOutputStream bw = new BufferedOutputStream(new FileOutputStream("copy.jpg")); // 寫出文件流
  
  byte b[] = new byte[1024];
  int len = 0;
 
  while ((len = br.read(b)) != -1) { // 寫出文件
   bw.write(b, 0, len);
   bw.flush(); // 別忘了刷新，要不然最后一塊緩沖區(qū)字符串會缺失
  }

  BufferedWriter bw2 = new BufferedWriter(new OutputStreamWriter(ss.getOutputStream())); // 輸出
  bw2.write("圖片傳輸成功");
  bw2.flush();
  
  bw.close();
  ss.close();
 }

}


// 客戶端

public class Client {
 public static void main(String[] args) throws UnknownHostException, IOException {
  Socket socket = new Socket("127.0.0.1", 5555);
  BufferedInputStream in = new BufferedInputStream(new FileInputStream("c.jpg"));

  BufferedOutputStream out = new BufferedOutputStream(socket.getOutputStream());

  byte b[] = new byte[1024];
  int len = 0;

  while ((len = in.read(b)) != -1) {
   out.write(b, 0, len);
   out.flush(); // 刷新緩沖區(qū) 要不然最后一塊緩沖區(qū)字符串會缺失
  }
  
  socket.shutdownOutput(); // 關(guān)閉流以后Server段才會接收道結(jié)束字符結(jié)束接受

  BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  String line;
  while ((line = br.readLine()) != null) {
   System.out.println(line);
  }
  
  in.close();
  socket.close();

 }

}

// 發(fā)送端
public class SendDemo {
 public static void main(String[] args) throws IOException {
  DatagramSocket ds = new DatagramSocket(); // 此類表示用來發(fā)送和接收數(shù)據(jù)報包的套接字。
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); // 鍵盤輸入
  String line = null;
  while ((line = br.readLine()) != null) {
   byte[] bytes = line.getBytes();
   DatagramPacket dp = new DatagramPacket(bytes, bytes.length, InetAddress.getByName("127.0.0.1"), 10005); // 數(shù)據(jù)包對象
   ds.send(dp);
   if ("886".equals(line)) { // 當(dāng)輸入886時結(jié)束發(fā)送
    break;
   }
  }
  ds.close();
 }

}


// 接收端

public class ReciveDemo {
 public static void main(String[] args) throws IOException {
  DatagramSocket ds = new DatagramSocket(10005); // 建立服務(wù)端
  byte bytes[] = new byte[1024];
  DatagramPacket dp = new DatagramPacket(bytes, bytes.length); // 建立數(shù)據(jù)包對象
  while (true) {
   ds.receive(dp); // 接受數(shù)據(jù)包
   byte[] data = dp.getData(); // 獲取數(shù)據(jù)
   String str = new String(data, 0, dp.getLength());
   if ("886".equals(str)) {
    break;
   }
   System.out.println(str);
  }
  ds.close();
 }
}