第十五章作业

第五题

import java.io.BufferedReader;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.URL;import java.net.URLConnection;public class Q_5 {    public static void main(String[] args) throws IOException {        URL url=  new URL("http://www.jianshu.com/p/17e771cb34aa");        URLConnection con = url.openConnection();        BufferedReader is=  new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));        FileOutputStream fos = new FileOutputStream("./test.txt");        String line;        while((line = is.readLine()) != null ) {            line = line + "\n";            fos.write(line.getBytes("UTF-8"));            fos.flush();        }        is.close();        fos.close();    }}

基于TCP的C/S通信程序

服务器端MultiTalkServer.java

import java.io.*;import java.net.ServerSocket;import java.net.Socket;class ServerThread extends Thread{    Socket socket = null;    int clienNum;    public ServerThread(Socket s, int num){        socket = s;        clienNum = num + 1;    }    public void run(){        try {            String readLine;            BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));            BufferedWriter os = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));            //PrintWriter os = new PrintWriter(socket.getOutputStream());            System.out.println("connected: " + socket.getInetAddress());            System.out.println("Client " + clienNum + ": " +  is.readLine());            readLine = sin.readLine();            while(!readLine.equals("bye")){                os.write(readLine + "\n");                 os.flush();                System.out.println("Client " + clienNum + ": " +  is.readLine());                readLine = sin.readLine();            }            os.close();            is.close();            socket.close();        } catch (IOException e) {            System.out.println("Error: " + e);        }    }}public class MultiTalkServer {    private static int clientNum = 0;    public static void main(String[] args) throws IOException {        ServerSocket server = null;        boolean listening = true;        try {            server = new ServerSocket(4700);        } catch (IOException e) {            System.out.println("Could not listen on port: 4700");            System.exit(-1);        }        while(listening){            new ServerThread(server.accept(), clientNum).start();            ++clientNum;        }        server.close();    }}

客户端TalkClient

import java.io.*;import java.net.Socket;public class TalkClient {    public static void main(String[] args) {        Socket socket = null;        try {            socket = new Socket("192.168.1.109", 4700);        } catch (IOException e) {            System.out.println("can't not listen to " + e);        }        try {            BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));            BufferedWriter os = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));            //PrintWriter os = new PrintWriter(socket.getOutputStream());            String readLine;            while(!(readLine = sin.readLine()).equals("bye")) {                os.write(readLine + "\n");                os.flush();                System.out.println("Server " + socket.getInetAddress() + ": " + is.readLine());            }            os.close();            is.close();            socket.close();        } catch (IOException e) {            e.printStackTrace();        }    }}

基于UDP的C/S通信程序

服务器端QuoteServer.java

import java.io.IOException;public class QuoteServer {    public static void main(String[] args) throws IOException {        new QuoteServerThread().start();     }}

QuoteServerThread.java

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class QuoteServerThread extends Thread{    protected DatagramSocket socket = null;    protected BufferedReader sin = null;    protected boolean moreQuotes = true;    public QuoteServerThread() throws IOException {        this("QuoteServerThread");    }    public QuoteServerThread(String name) throws IOException {        super(name);        socket = new DatagramSocket(4700);        sin = new BufferedReader(new InputStreamReader(System.in));    }    public void run() {        while (moreQuotes) {            try {                byte[] buf = new byte[256];                DatagramPacket packet = new DatagramPacket(buf, buf.length);                socket.receive(packet);                buf = packet.getData();                int size = 0;                while(buf[size] != '\0') ++size;                byte[] newBuf = new byte[size];                for(int i = 0; i < size; ++i)                    newBuf[i] = buf[i];                System.out.println("Client: " + new String(newBuf, "UTF-8"));                String dString = sin.readLine();                if (dString.equals("bye"))                    moreQuotes = false;                buf = dString.getBytes("UTF-8");                InetAddress address = packet.getAddress();                int port = packet.getPort();                packet = new DatagramPacket(buf, buf.length, address, port);                socket.send(packet);            } catch (IOException e) {                e.printStackTrace();                moreQuotes = false;            }        }        socket.close();    }}

QuoteClient.java

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class QuoteClient {    public static void main(String[] args) throws IOException {        DatagramSocket socket= new DatagramSocket();        BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));        InetAddress address = InetAddress.getByName("127.0.0.1");        String readLine;        while(!(readLine = sin.readLine()).equals("bye")) {            byte[] buf = readLine.getBytes("UTF-8");            DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 4700);            socket.send(packet);            buf = new byte[256];            packet = new DatagramPacket(buf, buf.length);            socket.receive(packet);            buf = packet.getData();            int size = 0;            while(buf[size] != '\0') ++size;            byte[] newBuf = new byte[size];            for(int i = 0; i < size; ++i)                newBuf[i] = buf[i];            System.out.println("Server: " + new String(newBuf, "UTF-8"));        }        socket.close();    }}