Java基础(14):网络编程之socket

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socket有两种协议通信方式：分别为tcp和udp。

Tcp协议通信

tcp协议是一种可靠协议，即使网络暂时阻塞，tcp也能保持通信的可靠性。

服务端：

public class SocketServerTest {public void init(){try {ServerSocket server=new ServerSocket(1000);Socket in=server.accept();InputStream input=in.getInputStream();OutputStream output=in.getOutputStream();PrintWriter out=new PrintWriter(output,true); out.println("hello , client!");System.out.println(input);System.out.println("server start");out.close();output.close();in.close();server.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}

客服端：

public class SocketClient {public void init(){try {Socket s=new Socket("127.0.0.1",1000);InputStream in=s.getInputStream();BufferedReader br=new BufferedReader(new InputStreamReader(in));String line=br.readLine();System.out.println(line);br.close();s.close();} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

Udp协议通信

udp协议相对tcp协议是一种不可靠协议，每次传送的数据大小也有限制。

服务端：

public class UdpServer {private int SIZE=4096;private int PORT=1111;private byte []buf=new byte[SIZE];private DatagramPacket packet,out;public void init() throws IOException{try {packet=new DatagramPacket(buf, buf.length);DatagramSocket socket=new DatagramSocket(PORT);socket.receive(packet);System.out.println(new String(buf,0,packet.getLength()));byte[] data=("server receive").getBytes();out=new DatagramPacket(data,data.length,packet.getSocketAddress());socket.send(out);} catch (SocketException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

客户端

public class UdpClient {private int SIZE=4096;private String IP="127.0.0.1";private int PORT=1111;private byte []buf=new byte[SIZE];private DatagramPacket packet,out;public void init() throws IOException{try {DatagramSocket socket=new DatagramSocket();byte[] outBuf=("client say hello").getBytes();packet=new DatagramPacket(buf, buf.length,InetAddress.getByName(IP),PORT);out=new DatagramPacket(outBuf, outBuf.length,InetAddress.getByName(IP),PORT);socket.send(out);socket.receive(packet);System.out.println(new String(buf,0,packet.getLength()));} catch (SocketException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

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