使用Java编写Socket服务器，并且与Flex通信（三）
掌握在通过客户端给服务端发送信息的例子，接着我们来通过服务端给客户端发信息
Java服务端代码：
Test2.java
package com.ruiri.app;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;
public class Test2 {
private List list;
protected Shell shell;
private ServerSocket server;
private Socket socket;
/**
* Launch the application
*
* @param args
*/
public static void main(String[] args) {
try {
Test2 window = new Test2();
window.open();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Open the window
*/
public void open() {
final Display display = Display.getDefault();
createContents();
shell.open();
shell.layout();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
}
/**
* Create contents of the window
*/
protected void createContents() {
shell = new Shell();
shell.setSize(286, 375);
shell.setText("socket服务器");
final Button button = new Button(shell, SWT.NONE);
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(final SelectionEvent e) {
Runnable runnable = new Runnable() {
public void run() {
try {
server = new ServerSocket(719);
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add("服务器等待");
}
});
while (true) {
socket = server.accept();
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add("已与客户机连接");
}
});
SocketThread thread = new SocketThread(socket,list);
thread.start();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (server != null) {
try {
if (!server.isClosed()) {
server.close();
Display.getDefault().asyncExec(
new Runnable() {
public void run() {
list.add("服务器断开");
}
});
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
};
Thread thread = new Thread(runnable);
thread.start();
}
});
button.setText("开启socket");
button.setBounds(42, 316, 72, 22);
list = new List(shell, SWT.V_SCROLL | SWT.BORDER | SWT.H_SCROLL);
list.setBounds(26, 10, 217, 300);
final Button button_1 = new Button(shell, SWT.NONE);
button_1.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(final SelectionEvent e) {
try {
if (server != null) {
server.close();
server = null;
}
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add("服务器断开");
}
});
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
button_1.setText("关闭socket");
button_1.setBounds(154, 316, 72, 22);
//
}
}
SocketThread.java
package com.ruiri.app;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.List;
public class SocketThread extends Thread {
public Socket socket;
public List list = null;
private BufferedReader reader;
private DataOutputStream writer;
private String str = "";
public SocketThread(Socket socket,final List list)
{
this.socket = socket;
this.list = list;
}
public void run()
{
try {
reader=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
while(true)
{
str = reader.readLine();
if(str==null) break;
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add(str);
}
});
writer=new DataOutputStream(socket.getOutputStream());
writer.writeUTF("服务器端发送的消息");
}
} catch (Exception e) {
e.printStackTrace();
}
finally{
try {
if(reader!=null) reader.close();
if(socket!=null) socket.close();
} catch (IOException e) {
e.printStackTrace();
}
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add("已与客户机断开");
}
});
}
}
}
Flex客户端代码：
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="application1_creationCompleteHandler(event)">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.events.FlexEvent;
private var socket:Socket;
protected function application1_creationCompleteHandler(event:FlexEvent):void
{
socket=new Socket();//创建Socket对象
socket.connect("localhost",719); //连接服务器
socket.addEventListener(Event.CONNECT,connectFun);//监听是否连接上服务器
socket.addEventListener(Event.CLOSE,closeFun);//监听套接字连接是否关闭
socket.addEventListener(ProgressEvent.SOCKET_DATA,progressFun);
}
private function connectFun(event:Event):void
{
jText.text+="已经成功连接到服务器！\n";
}
private function closeFun(event:Event):void
{
jText.text+="和服务器断开!\n"
}
private function progressFun(event:ProgressEvent):void
{
var msg:String="";
while(socket.bytesAvailable)
{
jText.text+=socket.readUTF()+"\n";
}
}
protected function button2_clickHandler(event:MouseEvent):void
{
var message:ByteArray=new ByteArray();//新建一个ByteArray存放数据
message.writeUTFBytes(msg.text +"\r\n");//写入数据，writeUTFBytes方法，以utf-8格式传数据避免中文乱码
socket.writeBytes(message); //写入Socket的缓冲区
socket.flush(); //调用flush方法发送信息
msg.text=""; //清空发言框
}
]]>
</fx:Script>
<fx:Declarations>
<!-- 将非可视元素（例如服务、值对象）放在此处 -->
</fx:Declarations>
<s:TextArea id="jText" x="139" y="129"/>
<s:TextInput id="msg" x="139" y="325" width="188"/>
<s:Button x="361" y="326" label="按钮" click="button2_clickHandler(event)"/>
</s:Application>
呼呼，到此为止，对Socket的学习就告一段落了，在这些技术的基础上，可以做一个简单的聊天室，有兴趣的可以自己尝试下。
网上也有现成的聊天室例子：http://space.flash8.net/bbs/thread-349661-1-1.html
关于Socket的这三篇文章写的有点乱，代码也不是很完善，有时间再整理了。
