七、基于浏览器-服务器的聊天室

package myk.chat;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;import java.util.Vector;public class ChatServer {/** * 聊天服务者server的主方法，该方法监听聊天着chatApplet的请求，并为新连接的聊天者创建一个新线程 */public static void main(String[] args) {ServerSocket socket = null;/**m_theads是一个静态变量，维护server方的所有ServerThread对象，通过该变量向所有加入聊天室的人发送信息 * 撤销退出的聊天着。*/Vector m_theads = new Vector();System.out.println("listen....");try {/**设置服务器端的端口号，必须和客户端的一致*/socket = new ServerSocket(5555);} catch (IOException e) {System.out.println("new ServerSocket() failed!!");}try {int nid = 0;while (true) {/*** * 监听是否有新聊天着连接服务器，线程运行到这块，会封锁，直到新的连接产生 */Socket s = socket.accept();System.out.println("accpted!");/**创建一个新的ServerThread*/ServerThread st = new ServerThread(s,m_theads);/**设置id号*/st.setId(nid++);/**将线程加入到m_theads Vector中*/m_theads.add(st);/**启动服务线程*/new Thread(st).start();/**通知所有线程，有新成员加入*/for(int i=0;i<#>welcome "+st.getId()+" to enter chatroom!");}System.out.println("listen again!");}} catch (IOException e) {System.out.println("server is down!");}}}

package myk.chat;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.Socket;import java.util.Vector;/**监听线程，监听对应的ChatApplet是否有信息传来*/public class ServerThread implements Runnable{Vector m_threads;Socket m_socket = null;DataInputStream m_in = null;DataOutputStream m_out = null;int m_nid;//初始化线程public ServerThread(Socket s,Vector threads){m_socket = s;m_threads = threads;try {//构造输入输出流对象m_in = new DataInputStream(m_socket.getInputStream());m_out = new DataOutputStream(m_socket.getOutputStream());} catch (IOException e) {e.printStackTrace();}}public void run() {//线程的执行体System.out.println("Thread is running!!!");try {while(true){//监听对应的ChatApplet是否有信息传来//线程封锁在这块，直到有信息传来String s = m_in.readUTF();if(s==null){break;}//如果传来信息leave，则向所有用户通知该用户离开if(s.trim().equals("leave")){for(int i=0;i******"+getId()+"leave"+"*****");}}else{//否则向所有用户发送信息for(int i=0;i******"+getId()+":"+s);}}}} catch (IOException e) {e.printStackTrace();}}//将msg送回对应的Appletpublic void write(String msg) {synchronized(m_out){try {m_out.writeUTF(msg);} catch (IOException e) {e.printStackTrace();}}}public int getId() {return m_nid;}public void setId(int mid){this.m_nid = mid;}}

package myk.chat;import java.applet.Applet;import java.awt.BorderLayout;import java.awt.Event;import java.awt.TextArea;import java.awt.TextField;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.InetAddress;import java.net.Socket;import java.net.URL;public class ChatApplet1 extends Applet implements Runnable{TextArea m_textArea;//接受消息显示窗口TextField m_textField;//发送消息输入窗口DataInputStream m_in;//消息输入流DataOutputStream m_out;//消息输出流/** * ChatApplet的初始化方法 */public void init(){setLayout(null);setSize(426,426);m_textArea = new TextArea(10,10);m_textField = new TextField();m_in = null;m_out = null;try {//初始化Applet,并连接到服务着URL url = getCodeBase();InetAddress inetAddress = InetAddress.getByName(url.getHost());Socket m_socket;//显示服务器ip地址，及通信协议System.out.println("server:"+inetAddress+url.getHost()+url.getProtocol());m_socket = new Socket(inetAddress,5555);//在套接口上建立输入流m_in = new DataInputStream(m_socket.getInputStream());//在套接口上建立输入流m_out = new DataOutputStream(m_socket.getOutputStream());} catch (Exception e) {e.printStackTrace();}setLayout(new BorderLayout());add("Center",m_textArea);add("South",m_textField);m_textArea.setEditable(false);//启动监听线程new Thread(this).start();}/** * 当在聊天窗口输入消息,按回车键，即可发送给chatServer */public boolean handleEvent(Event event){String b = m_textField.getText();if((event.target==m_textField)&& event.id==Event.ACTION_EVENT ){m_textField.setText("");try {//向聊天室发送utf格式的字符串m_out.writeUTF(b);} catch (IOException e) {e.printStackTrace();}return true;}else{return super.handleEvent(event);}}public void run() {try {while(true){String s = m_in.readUTF();//读一个UTF格式的字符串if(s!=null){//将消息显示在信息显示窗口中m_textArea.append(s+"/n");}}} catch (IOException e) {m_textArea.append("Netword problem or server down. /n ");m_textField.setVisible(false);}}public void stop(){try {m_out.writeUTF("leave");} catch (IOException e) {e.printStackTrace();}}}