fileexplorer.java

人民邮电出版社的《J2ME手机开发入门》全部源代码

            display.setCurrent(frmPropertys);
        } catch (Exception e) {
            Alert alert = new Alert("错误！",
                    "不能访问目录 " + currDirName +
                    " 中的文件 " + fileName +
                    "\n发生异常：" + e.toString(),
                    null,
                    AlertType.ERROR);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
    }
    
    
    /**
     * 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();
    }
    
    /**
     * 处理命令按钮事件
     */
    public void commandAction(Command c, Displayable d) {
        if (c == cmdView) {
            List curr = (List)d;
            final String currFile = curr.getString(curr.getSelectedIndex());
            
            //在线程中执行操作
            new Thread(new Runnable() {
                public void run() {
                    if (currFile.endsWith(FOLDER_END_STR) ||
                            currFile.equals(FATHER_FOLDER)) {
                        //目录跳转
                        traverseDirectory(currFile);
                    } else {
                        //显示文件内容
                        showFile(currFile);
                    }
                }
            }).start();
        } else if (c == cmdProperty) {
            //显示文件或者目录的属性
            List curr = (List)d;
            String currFile = curr.getString(curr.getSelectedIndex());
            
            showPropertyerties(currFile);
        } else if (c == cmdCreate) {
            //选择新建命令按钮后，首先显示创建文件或者文件夹的窗口
            showCreateFileForm();
        } else if (c == cmdCreateOK) {
            //在创建文件或者文件夹的窗口中输入完毕后，单击确定按钮后，
            //执行这里的代码
            String newName = nameInput.getString();
            if (newName == null || newName.equals("")) {
                Alert alert = new Alert("错误！",
                        "文件名为空，请输入文件名",
                        null,
                        AlertType.ERROR);
                alert.setTimeout(Alert.FOREVER);
                display.setCurrent(alert);
            } else {
                executeCreateeFile(newName,
                        typeInput.getSelectedIndex() != 0);
                Display.getDisplay(feInstance).
                        getCurrent().removeCommand(cmdCreateOK);
                Display.getDisplay(feInstance).
                        getCurrent().removeCommand(cmdBack);
            }
            
        } else if (c == cmdBack) {
            showCurrDir();
        } else if (c == cmdExit) {
            feInstance.destroyApp(false);
        } else if(c == cmdDelete) {
            final List curr = (List)d;
            
            new Thread(new Runnable(){
                public void run(){
                    delete(curr.getString(curr.getSelectedIndex()));
                }
            }).start();
            
        } else if (c == cmdCopy) {
            final List curr = (List)d;
            
            new Thread(new Runnable(){
                public void run(){
                    copy(curr.getString(curr.getSelectedIndex()));
                }
            }).start();
            
        } else if (c == cmdCut) {
            final List curr = (List)d;
            cutFlag = true;
            new Thread(new Runnable(){
                public void run(){
                    copy(curr.getString(curr.getSelectedIndex()));
                }
            }).start();
        } else if (c == cmdPaste) {
            if ((this.clipboardFileName != null) &&
                    (this.clipboardDir != null)) {
                new Thread(new Runnable(){
                    public void run(){
                        paste();
                    }
                }).start();
            }
        }
    }
    
    
    /**
     * 在另外的一个线程中创建文件或者文件夹
     */
    private void executeCreateeFile(final String name, final boolean val) {
        new Thread(new Runnable(){
            public void run(){
                createFile(name, val);
            }
        }).start();
    }
    
    /**
     * 创建一个文件或者文件夹
     * <p>
     * @param newName
     */
    void createFile(String newName, boolean isDirectory) {
        
        try {
            FileConnection fc = (FileConnection) Connector.open("file:///" +
                    currDirName + newName);
            if (isDirectory) {
                fc.mkdir();
            } else {
                fc.create();
            }
            fc.close();
            showCurrDir();
        } catch (Exception e) {
            String s = "不能创建文件 '" + newName + "'";
            if (e.getMessage() != null && e.getMessage().length() > 0) {
                s += "\n" + e;
            }
            Alert alert = new Alert("错误！", s, null, AlertType.ERROR);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
            
            //恢复删除的命令按钮
            display.getCurrent().addCommand(cmdCreateOK);
            display.getCurrent().addCommand(cmdBack);
        }
    }
    
    /**
     * 删除文件或者目录
     * <p>
     * @param fileName 要删除的文件或者目录
     */
    void delete(String fileName) {
        try {
            if (fileName.equals(FATHER_FOLDER)) {
                return;
            }
            
            FileConnection fc = (FileConnection)Connector.open(
                    "file://localhost/" + currDirName + fileName);
            
            if (!fc.exists()) {
                throw new IOException("文件不存在");
            }
            
            if (fc.isDirectory()) {
                throw new IOException("目前不支持文件夹的删除");
            }
            
            //当删除文件或者目录时显示对话框让用户确认操作
            ConfirmDialog cd = new ConfirmDialog(display, "删除文件",
                    "确认要删除文件吗？");
            if (cd.showDialog()== ConfirmDialog.MR_OK) {
                fc.delete();
            }
            fc.close();
            showCurrDir();
        } catch (Exception e) {
            Alert alert = new Alert("错误！",
                    "不能访问目录 " + currDirName +
                    " 中的文件 " + fileName +
                    "\n发生异常：" + e.toString(),
                    null,
                    AlertType.ERROR);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
    }
    
    /**
     * 复制文件到粘贴板
     * <p>
     * @param fileName 要复制的文件名
     */
    void copy(String fileName) {
        try {
            if (fileName.equals(FATHER_FOLDER)) {
                return;
            }
            
            FileConnection fc = (FileConnection)Connector.open(
                    "file://localhost/" + currDirName + fileName);
            
            if (!fc.exists()) {
                throw new IOException("文件不存在");
            }
            
            if (fc.isDirectory()) {
                throw new IOException("不支持文件夹的复制");
            }
            
            this.clipboardFileName = fileName;
            this.clipboardDir = currDirName;
            fc.close();
        } catch (Exception e) {
            Alert alert = new Alert("错误！",
                    "不能访问目录 " + currDirName +
                    " 中的文件 " + fileName +
                    "\n发生异常：" + e.toString(),
                    null,
                    AlertType.ERROR);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
    }
    
    /**
     * 从粘贴板复制文件到当前目录
     */
    void paste() {
        String fileName = clipboardFileName;
        try {
            if (fileName.equals(FATHER_FOLDER)) {
                return;
            }
            
            FileConnection fcSrc = (FileConnection)Connector.open(
                    "file://localhost/" + clipboardDir + fileName);
            
            FileConnection fcDst = (FileConnection)Connector.open(
                    "file://localhost/" + currDirName + fileName);
            
            if (!fcSrc.exists()) {
                throw new IOException("文件不存在");
            }
            
            if (fcDst.exists()) {
                //确认覆盖操作
                ConfirmDialog cd = new ConfirmDialog(display, "粘贴文件",
                        "文件已经存在，确认覆盖吗？");
                if (cd.showDialog()== ConfirmDialog.MR_OK) {
                    fcDst.delete();
                }
            }
            
            if (fcSrc.isDirectory()) {
                throw new IOException("不支持文件夹的复制和粘贴");
            }
            
            fcDst.create();
            InputStream is = fcSrc.openInputStream();
            OutputStream os = fcDst.openOutputStream();
            byte[] buffer = new byte[MAX_FILE_LENGTH];
            is.read(buffer);
            os.write(buffer);
            os.flush();
            
            if (cutFlag) {
                //剪切操作，要删除原来的文件
                fcSrc.delete();
            }
            fcDst.close();
            fcSrc.close();
            
            
            //复制完成后清空剪切板
            this.clipboardFileName = null;
            this.clipboardDir = null;
            cutFlag = false;
            
            showCurrDir();
        } catch (Exception e) {
            Alert alert = new Alert("错误！",
                    "不能访问目录 " + clipboardDir +
                    " 中的文件 " + fileName +
                    "\n发生异常：" + e.toString(),
                    null,
                    AlertType.ERROR);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert);
        }
    }
}