Java 网络编程简单学习2

客户端输入一个数，服务端接收后按照自定义协议返回数据

客户端收到服务端返回的数据，根据自定义协议解析，输出结果

测试时需先启动服务端/微笑

1、客户端

package com.linoer.http;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.Socket;/** * @author linoer * */public class TCPJudgeDemoClient {private static BufferedReader br;private static Socket socket;private static InputStream in;private static OutputStream out;private final static String HOST = "127.0.0.1";private final static int PORT = 10006;public static void main(String[] args) {init();while(true){System.out.println("请输入一个要判断质数的数字：");String input = readInput();if(isQiut(input)){byte[] bytes = "quit".getBytes();send(bytes);break;}if(checkInput(input)){System.out.println("合格数据为："+input);System.out.println("转换协议后的格式为："+buildInput(input));//input = buildInput(input);//发送数据send(input.getBytes());//接收数据byte[] result = receive();parseData(result);}else{System.out.println("不合法输入");}}close();}/** *  */private static void close() {// TODO Auto-generated method stubtry {br.close();in.close();out.close();socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * @param input * @return */private static String buildInput(String input) {return input+".";}/** * 解析协议 * @param res */public static void parseData(byte[] res){if(res ==null){System.out.println("服务端返回数据出错");return ;}byte value = res[0];//按照协议解析，0质数，1不是质数，2协议格式错误switch (value) {case 0:System.out.println("质数");break;case 1:System.out.println("不是质数");break;case 2:System.out.println("协议格式出错");break;default:break;}}/** * 接收数据 * @return */public static byte[] receive(){byte[] b = new byte[1024];int n;try {n = in.read(b);byte[] cpdata = new byte[n];System.arraycopy(b, 0, cpdata, 0, n);return cpdata;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();return null;}}/** * 判断用户输入是否合法 * @param s * @return */public static Boolean checkInput(String s){if(s == null){return false;}else{int n = Integer.parseInt(s);if(n>=2){return true;}else{return false;}}}/** * 发送数据给客户端 * @param b */public static void send(byte[] b){try {out.write(b);} catch (IOException e) {e.printStackTrace();}}/** * 判断是否结束 * @param s * @return */public static Boolean isQiut(String s){if(s == null){return false;}else{if("quit".equalsIgnoreCase(s)){return true;}else{return false;}}}/** *初始化 */public static void init(){//获取键盘输入br = new BufferedReader(new InputStreamReader(System.in));//实例化socket,io流try {socket = new Socket(HOST, PORT);in = socket.getInputStream();out = socket.getOutputStream();} catch (IOException e) {e.printStackTrace();}}/** * 获取输入 * @return返回用户输入的数 */public static String readInput(){try {return br.readLine();} catch (IOException e) {e.printStackTrace();return null;}}}

2、服务端

package com.linoer.http;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;/** * @author linoer * */public class TCPJudgeDemoServer {private static final int PORT = 10006;private static ServerSocket ss;public static void main(String[] args) {try {ss = new ServerSocket(PORT);System.out.println("启动服务器");while(true){Socket s = ss.accept();new DemoJudegeThread(s);}} catch (IOException e) {e.printStackTrace();}finally {try {ss.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

DemoJudgeThread线程类

package com.linoer.http;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;/** * @author linoer * */public class DemoJudegeThread extends Thread{Socket s;InputStream in;OutputStream out;public DemoJudegeThread(Socket s){this.s = s;init();start();}/** *  */private void init() {try {out = s.getOutputStream();in = s.getInputStream();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** *  */public void run() {// TODO Auto-generated method stubwhile(true){//接收客户端的反馈byte[] data = receive();//判断是否退出if(isQuit(data)){break;}byte[] b = judege(data);send(b);}close();}/** *  */private void close() {try {in.close();out.close();s.close();} catch (IOException e) {e.printStackTrace();}}/** * @param b */private void send(byte[] b) {try {out.write(b);} catch (IOException e) {e.printStackTrace();}}/** * @param data * @return */private byte[] judege(byte[] data) {byte[] b = new byte[1];if(data==null){b[0] = 2;return b;}Integer i = Integer.parseInt(new String(data));for (int j = 2; j <= Math.sqrt(i); j++) {if(i%j==0){b[0] = 1;break;}else{b[0] = 0;}}return b;}/** * @param data * @return */private boolean isQuit(byte[] data) {if(data==null){return false;}else{String s = new String(data);if(s.equalsIgnoreCase("quit")){return true;}else{return false;}}}/** * @return */private byte[] receive() {byte[] b = new byte[1024];try {int n = in.read(b);byte[] d = new byte[n];System.arraycopy(b, 0, d, 0, n);return d;} catch (IOException e) {e.printStackTrace();return null;}}}