[code="java"] package com.ming; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import javax.microedition.io.Connector; import javax.microedition.io.ContentConnection; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; /*下载图片到手机 * 无线联网技术 通用连接框架(GCF) */ public class DownloadImg extends MIDlet { private Display display; private Form f=new Form("下载图片"); //初始化Connection ContentConnection connection=null; //初始化字节数组输出 ByteArrayOutputStream bStm=null; //图片字节数组 byte imageData[]=null; //数据输入流 DataInputStream iStm=null; //初始化一张图片 Image img=null; protected void destroyApp(boolean arg0) throws MIDletStateChangeException { // TODO Auto-generated method stub } protected void pauseApp() { // TODO Auto-generated method stub } protected void startApp() throws MIDletStateChangeException { // TODO Auto-generated method stub display=Display.getDisplay(this); //链接地址(本机的TomCat服务器下的imgSite中名为mv.jpg的图片) String url="http://localhost:8080/imgSite/mv.jpg"; getImage(url);//根据链接地址获取图片 if (img!=null) { f.append(img);//加载显示图片 }else { f.append("Error"); } display.setCurrent(f); } //获取图片 private void getImage(String url){ try { //打开HTTP连接 connection=(ContentConnection)Connector.open(url); //打开数据输入流 iStm = connection.openDataInputStream(); //Http连接长度 int length=(int)connection.getLength(); if (length!=-1) { //实例化图片字节数组 imageData=new byte[length]; //数据输入流完整读取图片字节数组 iStm.readFully(imageData); }else{ bStm=new ByteArrayOutputStream(); int ch=iStm.read(); while (ch!=-1) { bStm.write(ch); imageData=bStm.toByteArray(); } } img=Image.createImage(imageData, 0,imageData.length); } catch (Exception e) { e.printStackTrace(); }finally{ //释放资源 try { if (connection!=null) {connection.close();} if (iStm!=null) {iStm.close();} if (bStm!=null) {bStm.close();} } catch (Exception e2) { // TODO: handle exception } } } } [/code]
J2ME_下载图片
猜你喜欢
转载自mingzijian.iteye.com/blog/1850671
今日推荐
周排行