FileUtils

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

public class FileUtils {

    /**
     * 读取一个文件夹下所有文件的绝对路径。忽略此文件夹下的问价夹
     *
     * @param absFolderPath
     *            文件夹绝对路径
     * @return List<String>
     */
    public static List<String> readFilePath(String absFolderPath) {
        List<String> paths = new ArrayList<String>();
        File file = new File(absFolderPath);
        // 文件夹
        if (file.isDirectory()) {
            for (File childFile : file.listFiles()) {
                // 不是文件夹并且没有被操作
                if (!childFile.isDirectory()) {
                    // 路径通过"/"手动创建，避免因window下出现反斜杠\ 路径的情况
                    paths.add(absFolderPath + "/" + childFile.getName());
                }
            }
        }
        return paths;
    }

    /**
     * 通过文件的绝对路径删除文件,如果传入是文件夹路径，忽略并返回false
     *
     * @param absFilePath
     *            文件绝对路径
     * @return boolean
     */
    public static boolean deleteFile(String absFilePath) {
        boolean result = false;
        File file = new File(absFilePath);
        if (!file.isDirectory()) {
            file.delete();
            result = true;
        }
        return result;
    }

    /**
     * 删除问价夹下所有文件
     *
     * @param absFolderPath
     * @return boolean
     */
    public static boolean deleteAllFileInTheFolder(String absFolderPath) {
        boolean result = true;
        for (String filePath : FileDealUtil.readFilePath(absFolderPath)) {
            result = result && FileDealUtil.deleteFile(filePath);
        }
        return result;
    }

    /**
     * 将文件移动到指定问价夹下
     *
     * @param filePath
     *            文件路径
     * @param folderPath
     *            文件夹路径
     * @return String 移动后文件路径,filePath为文件夹或folderPath为文件或文件正在被其他进程打开无法移动返回null

     */
    public static String moveFile(String filePath, String folderPath) {
        String path = null;

        File file = new File(filePath);
        if (file.isDirectory())
            return path;
        File folder = new File(folderPath);
        if (!folder.exists()) {
            folder.mkdirs();
        }
        if (!folder.isDirectory())
            return path;

        File nowFile = new File(folderPath + "/" + file.getName());
        if (nowFile.exists())
            nowFile.delete();
        if (file.renameTo(new File(folder, file.getName())))
            path = folderPath + "/" + file.getName();
        return path;
    }

    /**
     * 得到文件输入流
     *
     * @param path
     *            绝对路径
     * @return InputStream

     */
    public static InputStream getFile(String path) {
        // First try to read from the file system ...
        File file = new File(path);
        if (file.exists() && file.canRead()) {
            try {
                return new FileInputStream(file);
            } catch (FileNotFoundException e) {
                // continue
                return null;
            }
        }
        return null;
    }

    /**
     * 判断文件夹是否存在 void
     *
     */
    public static boolean existFolder(String folderPath) {
        File file = new File(folderPath);
        return file.exists();
    }

    /**
     * 创建文件夹
     *
     * @param folderPath
     *            void
     */
    public static void creatFolder(String folderPath) {
        if (!existFolder(folderPath)) {
            File file = new File(folderPath);
            file.mkdirs();
        }
    }

    /**
     * 获取文件大小 如果文件存在并且不是目录，返回文件大小，如果文件不存在或者是目录，返回0
     *
     * @return Long 单位bytes
     */
    public static Long getFileSize(String filePath) {
        File file = new File(filePath);
        if (file.exists() && !file.isDirectory()) {
            return file.length();
        } else {
            return 0L;
        }
    }

    /**
     * 从文件路径中分离出文件名
     *
     * @param filePath
     * @return String
     */
    public static String splitFileName(String filePath) {
        return filePath.substring(filePath.lastIndexOf("/") + 1);
    }

    /**
     *
     * @param filePath
     * @param inputStream
     * @return boolean
     */
    public static boolean writeFile(String filePath, InputStream inputStream) {
        OutputStream outputStream = null;
        try {
            outputStream = new FileOutputStream(filePath);

            int bytesRead = 0;
            byte[] buffer = new byte[2048];
            while ((bytesRead = inputStream.read(buffer, 0, 2048)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            return true;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        } finally {
            try {
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}