J2ME文件系统源代码

import java.io.IOException; import java.util.Calendar; import java.util.Date; import java.util.Enumeration; import javax.microedition.io.Connector; import javax.microedition.io.file.FileConnection; import javax.microedition.io.file.FileSystemRegistry; import javax.microedition.lcdui.Command; import javax.microedition.lcdui.CommandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Image; import javax.microedition.lcdui.List; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; public class FileProperties extends MIDlet implements CommandListener { Display display; List list = new List("浏览文件和文件夹", List.IMPLICIT); /** * 表示根目录的字符串 */ private final static String ROOT = "/"; /** * 表示父目录的字符串 */ private final static String PARENT_FOLDER = ".."; //文件和目录的图标 Image imgFile = null; //文件图标 Image imgDir = null; //目录图标 Image imgRoot = null; //根目录图标 //保存当前的路径，缺省为根路径 String curURI = ROOT; public FileProperties() { super(); //装载文件图标 try { imgFile = Image.createImage("/txtfile.JPG"); } catch (IOException e) { System.out.println("不能装载文件图标"); } //装载目录图标 try { imgDir = Image.createImage("/dirclose.JPG"); } catch (IOException e) { System.out.println("不能装载目录图标"); } //装载根目录图标 try { imgRoot = Image.createImage("/drive.JPG"); } catch (IOException e) { System.out.println("不能装载根目录图标"); } } protected void startApp() throws MIDletStateChangeException { String name = "microedition.io.file.FileConnection.version"; String value = System.getProperty( name ); if (value != null) { System.out.println("文件系统API版本：" + value); } else { System.out.println("当前手机不支持文件系统API"); return; } list.setCommandListener(this); display = Display.getDisplay(this); display.setCurrent(list); displayDir(); } protected void pauseApp() { // TODO 自动生成方法存根 } protected void destroyApp(boolean arg0) throws MIDletStateChangeException { } /** * 显示变量curDir中的全部的文件和子文件夹 * */ private void displayDir() { list.deleteAll(); if (curURI.equals(ROOT)) { Enumeration e = FileSystemRegistry.listRoots(); while (e.hasMoreElements()) { String rootName = (String)e.nextElement(); list.append(rootName, imgRoot); } } else { //显示目录中的全部文件和文件夹 list.append(PARENT_FOLDER, imgDir); //添加父目录 try { FileConnection fc = (FileConnection)Connector.open( "file://"+curURI); Enumeration e = fc.list(); while (e.hasMoreElements()) { String name = (String)e.nextElement(); if (name.indexOf("/")>-1) { //添加目录 list.append(name, imgDir); } else { //添加文件 list.append(name, imgFile); } } fc.close(); } catch (IOException ioe) { } } } /** * 处理命令按钮事件 */ public void commandAction(Command c, Displayable d) { if (c == List.SELECT_COMMAND) { int index = list.getSelectedIndex(); String name = list.getString(index); if (name == PARENT_FOLDER) { //返回上级目录 int i = curURI.lastIndexOf('/', curURI.length()-2); if (i != -1) { //获得父目录名字 curURI = curURI.substring(0, i+1); } else { curURI = ROOT; //根目录 } } else { //判断是否为子目录 String newname = curURI + name; System.out.println("选择目标为："+ newname); if (name.indexOf("/")>-1) { curURI = newname; } else { //如果为文件则显示属性 getProperties(newname); } } //在线程中显示当前目录 new Thread() { public void run() { displayDir(); } }.start(); } } private void getProperties(String name) { try { FileConnection fc = (FileConnection)Connector.open( "file://"+name); if (fc.exists()) { System.out.println("可以被读："+ fc.canRead()); System.out.println("可以被写："+ fc.canWrite()); System.out.println("隐藏："+ fc.isHidden()); System.out.println("位置："+ curURI); System.out.println("类型："+ (fc.isDirectory() ? "文件夹": "文件")); System.out.println("文件大小："+ fc.fileSize()); System.out.println("修改时间："+ formatTime(fc.lastModified())); System.out.println("文件系统的总空间大小：" + fc.totalSize()); System.out.println("文件系统中被使用的空间大小：" + fc.usedSize()); } fc.close(); } catch (Exception e) { } } /** * 格式化文件的时间，以中文习惯输出 */ private String formatTime(long time) { Calendar cal = Calendar.getInstance(); cal.setTime(new Date(time)); StringBuffer sb = new StringBuffer(); sb.append(cal.get(Calendar.YEAR)); sb.append("年"); sb.append(cal.get(Calendar.MONTH)); sb.append("月"); sb.append(cal.get(Calendar.DAY_OF_MONTH)+1); sb.append("日 "); sb.append(cal.get(Calendar.HOUR_OF_DAY)); sb.append(':'); sb.append(cal.get(Calendar.MINUTE)); sb.append(':'); sb.append(cal.get(Calendar.SECOND)); return sb.toString(); } }