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本文介绍了一个用于从网络加载图片到Java ME应用的实用类ImageHandler。该类通过HTTP连接获取远程图片资源，并将其转换为Java ME平台上的Image对象进行显示。

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package org.fox.image;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Image;

/**
* 类名：ImageHandler.java 编写日期: 2007-8-17
程序功能描述：
Demo:
*
Bug:

*
* 程序变更日期：
变更作者：
变更说明：

*
* @author wuhua rrq12345@163.com
*/
public class ImageHandler implements Runnable {

private HttpConnection c = null;
private InputStream is = null;
private ByteArrayOutputStream baos = new ByteArrayOutputStream();
private Image image = null;
private String iamgeUrl;
private ImageCanvas imageCanvas;
private ImagePart imagePart;

private ImageHandler(String imageUrl,ImagePart imagePart,ImageCanvas imageCanvas){
this.iamgeUrl = imageUrl;
this.imagePart = (ImagePart)imagePart;
this.imageCanvas = imageCanvas;
new Thread(this).start();
}

public static ImageHandler getIamgeHandler(String imageUrl,
ImagePart imagePart,ImageCanvas imageCanvas){
return new ImageHandler(imageUrl,imagePart,imageCanvas);
}
/* 获得网络图片 */
public Image handlerIamge() throws Exception{
byte[] imageData = null;
try {
c = (HttpConnection) Connector.open(iamgeUrl);
is = c.openInputStream();

int ch = 0;
while ((ch = is.read()) != -1) {
baos.write(ch); // 读取网络图片
}
} catch (IOException ioe) {
throw new IOException("Connect Error");
}

imageData = baos.toByteArray(); // 把图片转换成字节
try {
image = Image.createImage(imageData, 0, imageData.length);
} catch (NullPointerException e) {
throw new NullPointerException("NullPointerException");
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("IllegalArgumentException");
}

return image;
}

public void run() {
try {
imagePart.setImage(handlerIamge());
imageCanvas.repaint();
} catch (Exception e) {
e.printStackTrace();
}

}
}