用戶端為什麼要引入多線程，用戶端引入多線程

用戶端為什麼要引入多線程，用戶端引入多線程

聊天軟體中，輸入資料流和輸出資料流在同一個線程內應該獨立出來，彼此獨立（這就要引入多線程）

package com.sxt.chat;import java.io.BufferedReader;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.Socket;import java.net.UnknownHostException;public class Test {    public static void main(String[] args) throws UnknownHostException, IOException {        Socket client = new Socket("localhost",8888);        BufferedReader console = new BufferedReader(new InputStreamReader(System.in));        //輸入資料流（接收用戶端發送過來的）        DataInputStream dis = new DataInputStream(client.getInputStream());        //輸出資料流(發送給用戶端)        DataOutputStream dos = new DataOutputStream(client.getOutputStream());        while(true){            //給用戶端發送過去            String  msg =console.readLine();            dos.writeUTF(msg);            dos.flush();            //輸出用戶端發送過來的            String info = dis.readUTF();            System.out.println(info);                    }                    }}
從上面代碼中我們知道，先要從用戶端輸入資料，再接收伺服器端發送過來的資訊，而在我們聊天軟體中，接收資料和發送資料是獨立的，從而我們可以把上面代碼改成以下形式

package com.sxt.chat;import java.io.IOException;import java.net.Socket;import java.net.UnknownHostException;public class Client {    public static void main(String[] args) throws UnknownHostException, IOException {        Socket client = new Socket("localhost",8888);        //一條路徑        new Thread(new Send(client)).start();;        new Thread(new Receive(client)).start();;    }}

發送資料的代碼如下：

package com.sxt.chat;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.Socket;public class Send implements Runnable{    //從控制台輸入    private BufferedReader console ;    //輸出資料流(發送給伺服器端)    private DataOutputStream dos ;    //標誌位    private boolean  isRunning = true;    public Send(){      console = new BufferedReader(new InputStreamReader(System.in));    }    public Send(Socket client){        this();        try {            dos = new DataOutputStream(client.getOutputStream());        } catch (IOException e) {            isRunning =  false;            CloseUtil.closeAll(dos,console);        }            }    /*     *從控制台接收資料     */    public String getMsgFromConsole(){        try {            return console.readLine();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return "";    }    /*     *從控制台接收資料     */    public void send(){        String msg = getMsgFromConsole();        if(null!=msg&&!msg.equals("")){            try {                dos.writeUTF(msg);                dos.flush();            } catch (IOException e) {                isRunning = false;                CloseUtil.closeAll(dos,console);            }        }    }    @Override    public void run() {        while(isRunning){            send();        }    }}

接收資料的代碼如下：

package com.sxt.chat;import java.io.DataInputStream;import java.io.IOException;import java.net.Socket;public class Receive implements Runnable{    //輸入資料流（接收伺服器端發送過來的）    private DataInputStream dis ;    //標誌符    private boolean isRunning = true;    public Receive(){            }    public Receive(Socket client){        this();        try {            dis = new DataInputStream(client.getInputStream());        } catch (IOException e) {                    }    }    public String receive(){        String msg = "";        try {            msg = dis.readUTF();        } catch (IOException e) {            isRunning = false;            CloseUtil.closeAll(dis);        }        return msg;    }     @Override    public void run() {        while(isRunning){            System.out.println(receive());        }    }}

關閉流資料代碼如下：

package com.sxt.chat;import java.io.Closeable;import java.io.IOException;public class CloseUtil {    public static void closeAll(Closeable... io){        for(Closeable temp :io){            if(null!=temp){                try {                    temp.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }}

伺服器代碼如下：

package com.sxt.chat;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;public class Server {    public static void main(String[] args) throws IOException {        ServerSocket server = new ServerSocket(8888);        Socket client = server.accept();        //輸入資料流（接收用戶端發送過來的）        DataInputStream dis = new DataInputStream(client.getInputStream());        //輸出資料流(發送給用戶端)        DataOutputStream dos = new DataOutputStream(client.getOutputStream());        while(true){            //輸出用戶端發送過來的            String msg = dis.readUTF();            System.out.println(msg);            //給用戶端發送過去            dos.writeUTF("伺服器===》"+msg);            dos.flush();        }    }}