使用Java编写Socket服务器，并且与Flex通信（一）
我使用的Eclipse插件swt design 6.9.1 for eclipse开发的Java客户端的swt应用
Socket服务器的Java代码如下：
package com.ruiri.app;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
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 Test1 {
private List list;
protected Shell shell;
private ServerSocket server;
private Socket socket;
private BufferedReader reader;
private String str;
/**
* Launch the application
* @param args
*/
public static void main(String[] args) {
try {
Test1 window = new Test1();
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");
}
});
reader=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
try {
while(true)
{
str = reader.readLine();
if(str==null) break;
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add(str);
}
});
}
} catch (Exception e) {
e.printStackTrace();
}
finally{
if(reader!=null) reader.close();
if(socket!=null) socket.close();
Display.getDefault().asyncExec(new Runnable() {
public void run() {
list.add("已与客户机断开");
}
});
}
}
} catch (IOException e1) {
e1.printStackTrace();
}finally{
if(server!=null)
{
try {
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);
//
}
}
首先通过server = new ServerSocket(719);开启Socket服务，使用719端口
然后通过代码socket = server.accept(); 监测客户端连接，没有客户端联系的话，这个代码会堵塞到有客户端连接时才会继续往下走
所以这里使用了一个while(true)的死循环，只要有客户端连接就响应
再往下，reader=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
str = reader.readLine();是用来读取客户端发送过来的信息
注意到有这么一句if(str==null) break;这句很关键，至少在Flex调用Socket的时候非常有用，不用这个的话，关掉浏览器后，代码还是会通过reader.readLine();一直读取客户端发送的数据，陷入死循环，只是读到的值是null，所以这里通过这句代码在关闭浏览器的时候跳出循环
上面的代码虽然有点长，其实关键的代码不多。代码里面用到了启用多线程的方式，我的另外一篇文章有讲解：http://www.cnblogs.com/modou/articles/1525941.html
执行上面的代码，开启Socket服务以后，下面我们来编写Flex代码，编写客户端调用程序：
<?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
}
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"
}
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>
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