TCP(Socket基础编程)
1、TCP特点：
面向连接、可靠安全、传输量大、速度较慢
2、socket编程主要依靠两个类：socket 、serversocket
example1:客户端可以不停输入字符串，服务端返回字符串的大写
客户端代码：
1 public static void main(String[] args) throws Exception{ 2 //建立socket连接 连接一旦建立成功 就可以获得 输入流 和 写出流 3 Socket s = new Socket(InetAddress.getLocalHost(),10001); 4 //客户端从键盘输入字符 5 BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 6 //从服务端获取的输入流，可以获取从服务端返回的信息 7 BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream())); 8 //写出流 方式一 把信息发送到服务端 9 PrintWriter pw = new PrintWriter(s.getOutputStream(),true); 10 //写出流 方式二 11 //BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream())); 12 13 String line = null; 14 while((line=br.readLine())!=null){ 15 //写到服务端 方式一 16 pw.println(line); 17 //写到服务端 方式二 18 /* 19 bw.write(line); 20 bw.newLine(); 21 bw.flush(); 22 */ 23 //读取服务端返回信息(这是一个阻塞方法) 24 String result = in.readLine(); 25 26 System.out.println(result); 27 } 28 s.close(); 29 br.close(); 30 }
服务端代码：
1 public static void main(String[] args) throws Exception { 2 ServerSocket ss = new ServerSocket(10001); 3 while(true){ 4 //此方法是阻塞式方法 5 Socket s = ss.accept(); 6 //服务端这儿需要使用线程 每次接受一个客户端就为其开启一个线程，防止多个客户端访问出现阻塞情况 7 new Thread(new ServerThread(s)).start(); 8 } 9 }
1 class ServerThread implements Runnable{ 2 3 private Socket socket; 4 5 public ServerThread(Socket socket) { 6 this.socket = socket; 7 } 8 9 @Override 10 public void run() { 11 try { 12 System.out.println(socket.getInetAddress().getHostAddress()+"is connecting"); 13 BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())); 14 PrintWriter pw = new PrintWriter(socket.getOutputStream(),true); 15 String line =null; 16 while((line = br.readLine())!=null){ 17 //如果接收到结束标志 则结束 18 if("over".equals(line)){ 19 break; 20 } 21 System.out.println(line); 22 pw.println(line.toUpperCase()); 23 } 24 } catch (IOException e) { 25 // TODO Auto-generated catch block 26 e.printStackTrace(); 27 } 28 29 } 30 }
Example2：上传文件——客户端将文件内容写到服务端，服务端 将内容保存到其他位置，实现从服务端上传文件的功能
客户端代码：
1 public static void main(String[] args) throws Exception { 2 Socket s = new Socket(InetAddress.getLocalHost(),10001); 3 BufferedReader br = new BufferedReader(new FileReader(new File("D:/baichuanyu/HelloWorld/src/com/action/Hello.java"))); 4 BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream())); 5 PrintWriter pw = new PrintWriter(s.getOutputStream(),true); 6 String line = null; 7 while((line=br.readLine())!=null){ 8 pw.println(line); 9 } 10 //文件内容写到服务器完成后，服务端没有接受到结束标志，会继续readline()下去 11 //通过shutdownOutput()方法 可以向服务器写-1结束标志 从而结束服务端的readline()方法 12 s.shutdownOutput(); 13 String result = in.readLine(); 14 System.out.println(result); 15 s.close(); 16 br.close(); 17 }
服务端代码:
1 class UploadThread implements Runnable{ 2 3 private Socket socket; 4 5 public UploadThread(Socket socket) { 6 this.socket = socket; 7 } 8 9 @Override 10 public void run() { 11 try { 12 System.out.println(socket.getInetAddress().getHostAddress()+" is connecting...."); 13 BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())); 14 PrintWriter pw = new PrintWriter(new FileWriter(new File("E:\\Hello.txt")),true); 15 PrintWriter os = new PrintWriter(socket.getOutputStream(),true); 16 String line =null; 17 while((line = br.readLine())!=null){ 18 pw.println(line); 19 } 20 os.println("over"); 21 pw.close(); 22 } catch (IOException e) { 23 // TODO Auto-generated catch block 24 e.printStackTrace(); 25 } 26 27 } 28 }
1 public static void main(String[] args) throws Exception { 2 ServerSocket ss = new ServerSocket(10001); 3 while(true){ 4 //此方法是阻塞式方法 5 Socket s = ss.accept(); 6 //服务端这儿需要使用线程 每次接受一个客户端就为其开启一个线程，防止多个客户端访问出现阻塞情况 7 new Thread(new UploadThread(s)).start(); 8 } 9 }
