文件操作工具类FileHelper

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FileHelper

提供一些简单的文件操作方法，例如：移动、复制、删除文件及文件夹。
代码如下：

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.os.Environment;public class FileHelper {    private static FileHelper util;    synchronized public static FileHelper getInstance() {        if (util == null) {            util = new FileHelper();        }        return util;    }    private FileHelper() {        super();    }    /**     * 是否有外存卡     *      * @return     */    public boolean isExistExternalStore() {        if (Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED)) {            return true;        } else {            return false;        }    }    /**     * 得到sd卡路径     *      * @return     */    public String getExternalStorePath() {        if (isExistExternalStore()) {            return Environment.getExternalStorageDirectory().getAbsolutePath();        }        return null;    }    /**     * 将字符串写入文件     *      * @param text     * @param fileStr     * @param isAppend     */    public void writeFile(String text, String fileStr, boolean isAppend) {        try {            File file = new File(fileStr);            File parentFile = file.getParentFile();            if (!parentFile.exists()) {                parentFile.mkdirs();            }            if (!file.exists()) {                file.createNewFile();            }            FileOutputStream f = new FileOutputStream(fileStr, isAppend);            f.write(text.getBytes());            f.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    /**     * 移动文件 1 需要一个write权限 2 目录要同级别,这个很关键,你交换的两个文件夹要有相同的层数.     *      * @param srcFileName     *            源文件完整路径，需要文件名     * @param destDirName     *            目的目录路径,不需要文件名     * @return 文件移动成功返回true，否则返回false     */    public boolean moveFile(String srcFileName, String destDirName) {        File srcFile = new File(srcFileName);        if (!srcFile.exists() || !srcFile.isFile()) {            return false;        }        File destDir = new File(destDirName);        if (!destDir.exists()) {            destDir.mkdirs();        }        return srcFile.renameTo(new File(destDirName + File.separator                + srcFile.getName()));    }    /**     * 重命名     *      * @param oldFilePath     *            旧文件的完整路径     * @param newName     *            新的文件名     * @return     */    public boolean renameFile(String oldFilePath, String newName) {        File srcFile = new File(oldFilePath);        if (!srcFile.exists() || !srcFile.isFile()) {            return false;        }        File destDir = new File(srcFile.getParentFile(), newName);        return srcFile.renameTo(destDir);    }    /**     * 拷贝文件     *      * @param srcFile     * @param destFile     * @return     * @throws IOException     */    public boolean copyFileTo(File srcFile, File destFile) {        try {            if (!srcFile.exists() || srcFile.isDirectory()) {                return false;            }            if (destFile.isDirectory()) {                return false;            }            FileInputStream fis = new FileInputStream(srcFile);            FileOutputStream fos = new FileOutputStream(destFile);            int readLen = 0;            byte[] buf = new byte[1024];            while ((readLen = fis.read(buf)) != -1) {                fos.write(buf, 0, readLen);            }            fos.flush();            fos.close();            fis.close();            return true;        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return false;    }    public boolean copyFileTo(String srcStr, String destStr) {        File srcFile = new File(srcStr);        File destFile = new File(destStr);        return copyFileTo(srcFile, destFile);    }    /**     * 拷贝文件夹     *      * @param srcDir     * @param destDir     * @return     */    public boolean copyFilesTo(File srcDir, File destDir) {        if (!destDir.exists()) {            destDir.mkdirs();        }        if (!srcDir.isDirectory() || !destDir.isDirectory()) {            return false;        }        File[] srcFiles = srcDir.listFiles();        for (int i = 0; i < srcFiles.length; i++) {            if (srcFiles[i].isFile()) {                File destFile = new File(destDir.getPath() + File.separator                        + srcFiles[i].getName());                copyFileTo(srcFiles[i], destFile);            } else if (srcFiles[i].isDirectory()) {                File theDestDir = new File(destDir.getPath() + File.separator                        + srcFiles[i].getName());                copyFilesTo(srcFiles[i], theDestDir);            }        }        return true;    }    public boolean copyFilesTo(String srcStr, String destStr) {        File srcFile = new File(srcStr);        File destFile = new File(destStr);        return copyFilesTo(srcFile, destFile);    }    /**     * 移动文件     *      * @param srcFile     * @param destFile     * @return     */    public boolean moveFileTo(File srcFile, File destFile) {        boolean iscopy = copyFileTo(srcFile, destFile);        if (!iscopy)            return false;        delFile(srcFile.getAbsolutePath());        return true;    }    public boolean moveFileTo(String srcStr, String destStr) {        File srcFile = new File(srcStr);        File destFile = new File(destStr);        return moveFileTo(srcFile, destFile);    }    /**     * 删除文件     *      * @param filePath     * @return     */    public boolean delFile(String filePath) {        File file = new File(filePath);        if (!file.exists()) {            return false;        }        return file.delete();    }    /**     * 删除文件夹里的所有文件     *      * @param path     * @return     */    public boolean delAllFile(String path) {        boolean flag = false;        File file = new File(path);        if (!file.exists()) {            return flag;        }        if (!file.isDirectory()) {            return flag;        }        String[] tempList = file.list();        File temp = null;        for (int i = 0; i < tempList.length; i++) {            if (path.endsWith(File.separator)) {                temp = new File(path + tempList[i]);            } else {                temp = new File(path + File.separator + tempList[i]);            }            if (temp.isFile()) {                temp.delete();            }            if (temp.isDirectory()) {                delAllFile(path + File.separator + tempList[i]);                delFolder(path + File.separator + tempList[i]);                flag = true;            }        }        return flag;    }    /**     * 删除文件夹     *      * @param folderPath     */    public void delFolder(String folderPath) {        try {            delAllFile(folderPath);            String filePath = folderPath;            filePath = filePath.toString();            File myFilePath = new File(filePath);            myFilePath.delete();        } catch (Exception e) {            e.printStackTrace();        }    }}
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