我也是今天剛會(huì)的，flex4開發(fā)Chart圖表的初級(jí)程序員，不太會(huì)用MyEclipse建立servlet，這篇文章對(duì)你們很有用，程序代碼都是從網(wǎng)上搜集到的。
1.使用BitmapData將flex的某個(gè)UIComponent轉(zhuǎn)換為ByteArray

在mxml文件里編寫代碼，創(chuàng)建函數(shù)getJPGByteArray。
參數(shù)：圖表對(duì)象實(shí)例
功能：將圖表轉(zhuǎn)換為ByteArray類型
配置：導(dǎo)入JPGEncoder.as和BitString.as類文件

2.使用JPGEncoder轉(zhuǎn)換ByteArray。

3.使用URLRequest發(fā)送ByteArray到服務(wù)端的java servlet

在mxml文件里編寫代碼，創(chuàng)建函數(shù)sendImageByte

參數(shù)：圖表對(duì)象實(shí)例
功能：將轉(zhuǎn)換的數(shù)據(jù)發(fā)送到servlet地址
配置：導(dǎo)入JPGEncoder.as和BitString.as類文件

4.在servlet中使用ImageIO保存圖片或者輸出到response
編寫java文件，創(chuàng)建類ImageServlet繼承HttpServlet

功能：處理接收的ByteArray數(shù)據(jù)輸出jpg圖片

配置：導(dǎo)入commons-io-1.4.jar包

用到的包和類文件在附件里。


詳細(xì)解釋：
在flex4里創(chuàng)建mxml文件Keep_Jpg.mxml，代碼如下：
< ?xml version="1.0" encoding="utf-8"?>
< s:Application xmlns:fx="<a target="_blank">http://ns.adobe.com/mxml/2009&lt;;;/a>"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
<fx:Declarations>

</fx:Declarations><br> <fx:Script><br> <![CDATA[

import mx.controls.Alert;
import mx.core.UIComponent;
import mx.collections.ArrayCollection;
import com.JPGEncoder;

[Bindable]
public var expenses:ArrayCollection = new ArrayCollection(
[
{Month:"Jan", Profit:2000, Expenses:1500},
{Month:"Feb", Profit:1000, Expenses:200},
{Month:"Mar", Profit:1500, Expenses:500} ] );
public function getJPGByteArray(target:UIComponent):ByteArray {
var bitmapData : BitmapData = new BitmapData(target.width, target.height);
bitmapData.draw(target);
var jpg : JPGEncoder = new JPGEncoder();
var jpgByteArray : ByteArray = jpg.encode(bitmapData);
return jpgByteArray;
}
public function sendImageByte(target:UIComponent):void {
var request:URLRequest = new URLRequest("<a href="http://localhost:8080/Keep_images/requestUrl" target="_blank"><span style="color:#ff483f;">http://localhost:8080/Keep_images/requestUrl</span></a>");
request.contentType = 'applicatoin/octet-stream';
request.data = getJPGByteArray(target);
request.method = URLRequestMethod.POST;
navigateToURL(request, "_blank");
}
]]>
</fx:Script><br> <mx:Panel id="chartPanel" title="Bar Chart" width="300" height="400">
<mx:BarChart id="myChart" dataProvider="{expenses}" width="100%" height="100%">
<mx:verticalAxis>
<mx:CategoryAxis dataProvider="{expenses}"
categoryField="Month" />
</mx:verticalAxis>
<mx:series>
<mx:BarSeries yField="Month" xField="Profit" displayName="Profit" />
<mx:BarSeries yField="Month" xField="Expenses" displayName="Expenses" />
</mx:series>
</mx:BarChart>
<mx:Legend dataProvider="{myChart}"/>
<mx:Button label="導(dǎo)出圖表圖片" click="sendImageByte(myChart)"/>
<mx:Button label="導(dǎo)出整個(gè)圖表圖片" click="sendImageByte(chartPanel)"/>
</mx:Panel>
</s:Application><br><strong>
在src文件夾里要?jiǎng)?chuàng)建com包，將JPGEncoder.as和BitString.as拷就去，這樣就不會(huì)出錯(cuò)了吧。
然后在MyEclipse里編寫Java代碼，創(chuàng)建Web Project，在src里創(chuàng)建包servlet，然后在包里創(chuàng)建ImageServlet.java文件，代碼如下：
package servlet;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;

public class ImageServlet extends HttpServlet {

public ImageServlet() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
doService(arg0, arg1);
}

protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
doService(arg0, arg1);
}

public void init() throws ServletException {
// Put your code here
}
private void doService(HttpServletRequest request, HttpServletResponse response) throws IOException {
saveImage(request, response);
//printImage(request, response);
}
private void saveImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
String fileName = "D://" + System.currentTimeMillis() + ".jpg";
BufferedImage bufferedImage = ImageIO.read(request.getInputStream());
if (bufferedImage != null) {
ImageIO.write(bufferedImage, "jpeg", new File(fileName));
}
}

private void printImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setContentType("image/jpeg");
response.setHeader("Content-Length:", String.valueOf(request.getInputStream().available()));

ServletOutputStream sos = response.getOutputStream();
IOUtils.copy(request.getInputStream(), sos);
sos.flush();
sos.close();
}
}
要導(dǎo)入包c(diǎn)ommons-io-1.4.jar，包放的文件目錄Keep_images\WebRoot\WEB-INF\lib里，然后點(diǎn)擊發(fā)布Project Deployments管理器，添加Keep_images到tomcat服務(wù)器，
還有一點(diǎn)修改WEB-INF里的web.xml文件哦！加入代碼如下（加到的上面）：

ImageServlet
servlet.ImageServlet


ImageServlet
/requestUrl

然后運(yùn)行，地址http://localhost:8080/Keep_images/requestUrl，這個(gè)地址粘貼到那個(gè)mxml里就可以了。requestUrl的名字可以隨便起哦！


夠詳細(xì)了吧！再菜鳥的人也該會(huì)做了！ 百圖匯-圖片設(shè)計(jì)資源