java 文件操作工具类

/** * 文件工具类 *  */public class FileUtil {    private FileUtil() {    }    /**     * 创建文件     * @param in     * @param filePath     */    public static void createFile(InputStream in, String filePath) {        if(null == in){            throw new RuntimeException("创建文件失败: 入参inputstream为空");        }        if(null == filePath){            throw new RuntimeException("创建文件失败: 入参filePath为空");        }        int potPos = filePath.lastIndexOf('/') + 1;        String folderPath = filePath.substring(0, potPos);        createFolder(folderPath);        FileOutputStream outputStream = null;        try {            outputStream = new FileOutputStream(filePath);            byte[] by = new byte[1024];            int c;            while ((c = in.read(by)) != -1) {                outputStream.write(by, 0, c);            }            outputStream.close();            in.close();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * Java从文件路径中获取文件名     *      * @param filePath     * @return     */    public static String getPathFileName(String filePath) {        if ((filePath != null) && (filePath.length() > 0)) {            filePath = filePath.replaceAll("\\\\", "/");            int dot = filePath.lastIndexOf("/");            if ((dot > -1) && (dot < (filePath.length()))) {                return filePath.substring(dot + 1, filePath.length());            }        }        return filePath;    }    /**     * 把内容写入文件     *      * @param filePath     * @param fileContent     */    public static void write(String filePath, String fileContent) {        try {            FileOutputStream fo = new FileOutputStream(filePath);            OutputStreamWriter out = new OutputStreamWriter(fo, "UTF-8");            out.write(fileContent);            out.close();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 按编码格式读取文件内容 默认是UTF-8编码     *      * @param filePath     * @return     */    public static String read(String filePath, String code) {        if (code == null || code.equals("")) {            code = "UTF-8";        }        String fileContent = "";        File file = new File(filePath);        try {            InputStreamReader read = new InputStreamReader(new FileInputStream(file), code);            BufferedReader reader = new BufferedReader(read);            String line;            while ((line = reader.readLine()) != null) {                fileContent = fileContent + line + "\n";            }            read.close();            read = null;            reader.close();            read = null;        } catch (Exception ex) {            ex.printStackTrace();            fileContent = "";        }        return fileContent;    }    /**     * 判断文件是否存在     *      * @param filePath     */    public static boolean exist(String filepath) {        File file = new File(filepath);        return file.exists();    }    /**     * 创建文件夹     *      * @param filePath     */    public static void createFolder(String filePath) {        try {            File file = new File(filePath);            if (!file.exists()) {                file.mkdirs();            }        } catch (Exception ex) {            System.err.println("Make Folder Error:" + ex.getMessage());        }    }    /**     * 重命名文件、文件夹     *      * @param from     * @param to     */    public static void renameFile(String from, String to) {        try {            File file = new File(from);            if (file.exists()) {                file.renameTo(new File(to));            }        } catch (Exception ex) {            System.err.println("Rename File/Folder Error:" + ex.getMessage());        }    }    /**     * 得到文件的扩展名（即.后面的后缀名）     *      * @param fileName     * @return     */    public static String getFileExt(String fileName) {        int potPos = fileName.lastIndexOf('.') + 1;        String type = fileName.substring(potPos, fileName.length());        return type;    }    /**     * 通过File对象创建文件     *      * @param file     * @param filePath     */    public static void createFile(File file, String filePath) {        int potPos = filePath.lastIndexOf('/') + 1;        String folderPath = filePath.substring(0, potPos);        createFolder(folderPath);        FileOutputStream outputStream = null;        FileInputStream fileInputStream = null;        try {            outputStream = new FileOutputStream(filePath);            fileInputStream = new FileInputStream(file);            byte[] by = new byte[1024];            int c;            while ((c = fileInputStream.read(by)) != -1) {                outputStream.write(by, 0, c);            }        } catch (IOException e) {            e.getStackTrace().toString();        }        try {            outputStream.close();        } catch (IOException e) {            e.printStackTrace();        }        try {            fileInputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 将输入流转换为字符串     *      * @param stream     */    public static String readStreamToString(InputStream stream) {        String fileContent = "";        try {            InputStreamReader read = new InputStreamReader(stream, "utf-8");            BufferedReader reader = new BufferedReader(read);            String line;            while ((line = reader.readLine()) != null) {                fileContent = fileContent + line + "\n";            }            read.close();            read = null;            reader.close();            read = null;        } catch (Exception ex) {            fileContent = "";        }        return fileContent;    }    /**     * 复制整个文件夹内容     *      * @param oldPath     *            String 原路径     * @param newPath     *            String 目标路径     * @return boolean     */    public static void copyFolder(String oldPath, String newPath) {        try {            (new File(newPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹            File oldFile = new File(oldPath);            String[] file = oldFile.list();            File temp = null;            for (int i = 0; i < file.length; i++) {                if (oldPath.endsWith(File.separator)) {                    temp = new File(oldPath + file[i]);                } else {                    temp = new File(oldPath + File.separator + file[i]);                }                if (temp.isFile()) {                    FileInputStream input = new FileInputStream(temp);                    FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString());                    byte[] b = new byte[1024 * 5];                    int len;                    while ((len = input.read(b)) != -1) {                        output.write(b, 0, len);                    }                    output.flush();                    output.close();                    input.close();                }                if (temp.isDirectory()) {// 如果是子文件夹                    copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);                }            }        } catch (Exception e) {            System.out.println("复制整个文件夹内容操作出错");            e.printStackTrace();        }    }    /**     * 删除文件夹     *      * @param filePathAndName     *            String 文件夹路径及名称 如c:/fqf     * @param fileContent     *            String     * @return boolean     */    public static void delFolder(String folderPath) {        try {            delAllFile(folderPath); // 删除完里面所有内容            String filePath = folderPath;            filePath = filePath.toString();            java.io.File myFilePath = new java.io.File(filePath);            myFilePath.delete(); // 删除空文件夹        } catch (Exception e) {            System.out.println("删除文件夹操作出错");            e.printStackTrace();        }    }    /**     * 删除文件夹里面的所有文件     *      * @param path     *            String 文件夹路径 如 c:/fqf     */    public static void delAllFile(String path) {        File file = new File(path);        if (!file.exists()) {            return;        }        if (!file.isDirectory()) {            return;        }        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 + "/" + tempList[i]);// 先删除文件夹里面的文件                delFolder(path + "/" + tempList[i]);// 再删除空文件夹            }        }    }    /**     * 移动文件到指定目录     *      * @param oldPath     *            String 如：c:/fqf.txt     * @param newPath     *            String 如：d:/fqf.txt     */    public static void moveFolder(String oldPath, String newPath) {        copyFolder(oldPath, newPath);        delFolder(oldPath);    }