Java 网络编程（五）TCP

客户端

　　1.连接服务器socket

　　2.发送消息

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//客户端 public class TcpClientDemo01 {     public static void main(String[] args) {         Socket socket = null;         OutputStream os = null;         try {             //1.要知道服务器的地址,端口号             InetAddress serverIp = InetAddress.getByName("127.0.0.1");             int port = 9999;             //2.创建一个socket连接             socket = new Socket(serverIp,port);             //3.发送消息 IO流             os = socket.getOutputStream();             os.write("你好，欢迎您！".getBytes());         } catch (Exception e) {             e.printStackTrace();         }finally {             if (os!=null){                 try {                     os.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if (socket != null){                 try {                     socket.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }       } }

　　

服务器

　　1.建立服务端口ServerSocket

　　2.等待用户的连接accept

　　3.接受用户的消息

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//服务端 public class TcpServerDemo01 {     public static void main(String[] args) {         ServerSocket serverSocket = null;         Socket accept = null;         InputStream is = null;         ByteArrayOutputStream baos = null;         try {             //1.我得有一个地址             serverSocket = new ServerSocket(9999);             //2.等待客户端连接过来             accept = serverSocket.accept();             //3.读取客户端的消息             is = accept.getInputStream();             //管道流             baos = new ByteArrayOutputStream();             byte[] buffer = new byte[1024];             int len;             while((len = is.read(buffer)) != -1){                 baos.write(buffer,0,len);             }             System.out.println(baos.toString());         } catch (IOException e) {             e.printStackTrace();         }finally {             //关闭资源             if(baos != null) {                 try {                     baos.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if (is != null) {                 try {                     is.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if (accept != null) {                 try {                     accept.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if (serverSocket != null) {                 try {                     serverSocket.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }       } }

　　

文件上传

客户端

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public class TcpClientDemo02 {     public static void main(String[] args) throws Exception{         //1.创建一个Socket连接         Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9000);         //2.创建一个输出流         OutputStream os = socket.getOutputStream();         //3.读取文件         FileInputStream fis = new FileInputStream(new File("a.jpg"));         //4.写出文件         byte[] buffer = new byte[1024];         int len;         while((len=fis.read(buffer))!=-1){             os.write(buffer,0,len);         }         //通知服务器我已经结束了         socket.shutdownOutput();//我已经传输完了                   //确定服务器接收完毕才能够断开连接         InputStream inputStream = socket.getInputStream();         ByteArrayOutputStream baos = new ByteArrayOutputStream();        byte[] buffer2 = new byte[1024];        int len2;        while((len2 = inputStream.read(buffer2)) != -1){            baos.write(buffer2,0,len2);        }           System.out.println(baos.toString());           //5.关闭资源         baos.close();        inputStream.close();         fis.close();         os.close();         socket.close();     } }

　　服务端

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public class TcpServerDemo02 {     public static void main(String[] args) throws Exception{         //1.创建服务         ServerSocket serverSocket = new ServerSocket(9000);         //2.监听客户端的连接         Socket socket = serverSocket.accept();//阻塞式监听，会一直等待客户端连接         //3.获取输入流         InputStream is = socket.getInputStream();         //4.文件输出         FileOutputStream fos = new FileOutputStream(new File("receive.jpg"));         byte[] buffer = new byte[1024];         int len ;         while ((len = is.read(buffer)) != -1){             fos.write(buffer,0,len);         }         //通知客户端接收完毕         OutputStream os = socket.getOutputStream();         os.write("我接收完毕，你可以断开了".getBytes());           //关闭资源         fos.close();         is.close();         socket.close();         serverSocket.close();     } }

　　

 

 

Tomcat

服务端

　　·自定义S

　　·Tomcat服务器S

客户端

　　·自定义C

　　·浏览器B