public class TcpClientDemo01 { public static void main(String[] args) { Socket socket=null; OutputStream os=null; //1.我得知道服务器地址 try { InetAddress serverIP = InetAddress.getByName("127.0.0.1"); //端口号 int port=9999; //2.建立一个socket链接 socket = new Socket(serverIP,port); //3.发送消息 IO流 os = socket.getOutputStream(); os.write("你好!".getBytes()); } catch (Exception e) { e.printStackTrace(); } finally { //IP地址不用关 if(os!=null) { try { os.close(); } catch (IOException e) { e.printStackTrace(); } } if(socket!=null){ try { socket.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
public class TcpClientDemo02 { public static void main(String[] args) { ServerSocket serverSocket=null; Socket socket=null; InputStream is=null; ByteArrayOutputStream baos=null; //提高做用域,在finally中才能关 //1.我得有一个地址提供出去 try { serverSocket = new ServerSocket(9999); while(true){ //无限循环实现不断接收 //2.等待客户端链接过来 socket = serverSocket.accept(); //这里的socket和客户端时同一个变量 //3.读取客户端的消息 is = socket.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 先开后关 if(baos!=null){ try { baos.close(); } catch (IOException e) { e.printStackTrace(); } } if(is!=null){ try { is.close(); } catch (IOException e) { e.printStackTrace(); } } if(socket!=null){ try { socket.close(); } catch (IOException e) { e.printStackTrace(); } } if(serverSocket!=null){ try { serverSocket.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
客户端代码java
public class TcpClientDemo02 { public static void main(String[] args)throws Exception { //1.建立一个socket链接 Socket socket= new Socket( InetAddress.getByName("127.0.0.1"),9000); //2.建立一个输出流 OutputStream os = socket.getOutputStream(); //3.文件流 FileInputStream fis = new FileInputStream(new File("abc.jpg")); //4;.写出文件 byte[] buffer = new byte[1024]; int len; while((len=fis.read(buffer))!=-1){ os.write(buffer,0,len); } //5.通知服务器,已经结束了 socket.shutdownOutput(); //我已经传输完了 //6.肯定服务器接受完毕,才能断开链接 InputStream inputStream = socket.getInputStream(); //String byte[] ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer2= new byte[1024]; int len2; while ((len2=inputStream.read(buffer2))!=-1){ baos.write(buffer,0,len2); } //7.关闭资源 fis.close(); os.close();; socket.close(); } }
服务端代码web
public class TcpSeverDemo02 { public static void main(String[] args) throws IOException { //1.建立服务 ServerSocket serverSocket=new ServerSocket(9000); //2.监听客户端的链接 Socket socket = serverSocket.accept();//阻塞式监听,会一直等待客户端链接 //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); } //5. 通知客户端我接受完毕了 OutputStream os = socket.getOutputStream(); os.write("我接受完毕了,能够断开了".getBytes()); //6.关闭资源 fos.close(); is.close(); socket.close(); serverSocket.close(); } }