java文件操作工具類FileUtils

package cloud.simple.service.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

import org.apache.commons.lang.StringUtils;


/****
 *  文件操作類
 *  @version 1.0
 */
public class FileUtils extends org.apache.commons.io.FileUtils {
   private static final int BUFFER_SIZE = 16 * 1024;
   private static final long IMG_MAX_SIZE = 2 * 1024;
   private static final String[] vidExt = new String[] { "rm", "rmvb", "mov",
         "mtv", "dat", "wmv", "avi", "3gp", "amv", "dmv" };
   private static final String[] imgExt = new String[] { "bmp", "png", "gif",
         "jpeg", "jpg" };
   private static final String[] docExt = new String[] { "doc", "docx" };

   /**
    * 刪除指定目錄下的所有文件
    * 
    * @param folderPath
    *            目錄路徑
    * @return true:刪除成功 false:刪除失敗
    */
   public static boolean delAllFile(String folderPath) {
      boolean flag = false;
      File file = new File(folderPath);
      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 (folderPath.endsWith(File.separator)) {
            temp = new File(folderPath + tempList[i]);
         } else {
            temp = new File(folderPath + File.separator + tempList[i]);
         }
         if (temp.isFile()) {
            temp.delete();
         }
         if (temp.isDirectory()) {
            delAllFile(folderPath + "/" + tempList[i]);// 先刪除文件夾里面的文件
            delFolder(folderPath + "/" + tempList[i]);// 再刪除空文件夾
            flag = true;
         }
      }
      return flag;
   }

   /**
    * 刪除指定文件
    * 
    * @param filePath
    *            指定文件的路徑
    * @return true:刪除成功 false:刪除失敗
    */
   public static boolean delFile(String filePath) {
      boolean flag = false;
      File file = new File(filePath);
      if (!file.exists()) {
         return flag;
      }
      flag = (new File(filePath)).delete();
      return flag;
   }

   /**
    * 刪除指定文件夾(包括文件夾下的所有文件)
    * 
    * @param folderPath
    *            指定文件夾路徑
    * @return true:刪除成功 false:刪除失敗
    */
   public static boolean delFolder(String folderPath) {
      try {
         delAllFile(folderPath); // 刪除完里面所有內容
         String filePath = folderPath;
         filePath = filePath.toString();
         java.io.File myFilePath = new java.io.File(filePath);
         myFilePath.delete(); // 刪除空文件夾
      } catch (Exception e) {
         e.printStackTrace();
         return false;
      }
      return true;
   }

   /**
    * 讀取文本文件的內容
    * 
    * @param curfile
    *            文本文件路徑
    * @return 返回文件內容
    */
   public static String readFile(String curfile) {
      File f = new File(curfile);
      try {
         if (!f.exists())
            throw new Exception();
         FileReader cf = new FileReader(curfile);
         BufferedReader is = new BufferedReader(cf);
         StringBuilder filecontent = new StringBuilder("");
         String str = is.readLine();
         while (str != null) {
            filecontent.append(str);
            str = is.readLine();
            if (str != null)
               filecontent.append(System.getProperty("line.separator","\n"));
         }
         is.close();
         cf.close();
         return filecontent.toString();
      } catch (Exception e) {
         System.err.println("不能讀屬性文件: " + curfile + " \n" + e.getMessage());
         return "";
      }

   }

   /**
    * 取指定文件的擴展名
    * 
    * @param filePathName
    *            文件路徑
    * @return 擴展名
    */
   public static String getFileExt(String filePathName) {
      int pos = 0;
      pos = filePathName.lastIndexOf('.');
      if (pos != -1)
         return filePathName.substring(pos + 1, filePathName.length());
      else
         return "";

   }

   /**
    * 讀取文件大小
    * 
    * @param filename
    *            指定文件路徑
    * @return 文件大小
    */
   public static int getFileSize(String filename) {
      try {
         File fl = new File(filename);
         int length = (int) fl.length();
         return length;
      } catch (Exception e) {
         return 0;
      }

   }

   /**
    * 文件拷貝
    * 
    * @param src
    *            源文件
    * @param dst
    *            目標文件
    * @param delete
    *            是否刪除源文件
    */
   public static void copyFile(File src, File dst, boolean delete) {
      try {
         InputStream in = null;
         OutputStream out = null;
         try {
            in = new BufferedInputStream(new FileInputStream(src),
                  BUFFER_SIZE);

            out = new BufferedOutputStream(new FileOutputStream(dst),
                  BUFFER_SIZE);
            byte[] buffer = new byte[BUFFER_SIZE];
            int n = 0;
            while ((n = in.read(buffer)) > 0) {
               out.write(buffer,0,n);
            }
         } finally {
            if (null != in) {
               in.close();
            }
            if (null != out) {
               out.close();
            }
         }
         if (delete)
            src.delete();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

   /**
    * 獲取源文件類型
    * 
    * @param ext
    * @return
    */
   public static String getSourceFileType(String ext) {

      for (String img : imgExt) {
         if (ext.equalsIgnoreCase(img))
            return "IMG";
      }
      
      for (String doc : docExt) {
         if (ext.equalsIgnoreCase(doc))
            return "DOC";
      }

      for (String vid : vidExt) {
         if (ext.equalsIgnoreCase(vid))
            return "VID";
      }

      return null;
   }

   /**
    * 檢查上傳文件有效性
    * 
    * @param file
    * @param fileName
    * @param type
    *            1、 圖片 2、文檔 3、音頻
    * @return
    */
   public static Object[] checkUploadFile(File file, String fileName,
         Integer type) {
      Object[] returns = new Object[] { true, "上傳文件有效。" };
      if (file.length() > IMG_MAX_SIZE) {
         returns[0] = false;
         returns[1] = "上傳文件過大,請重新上傳。";
         return returns;
      }

      String ext = fileName.substring(fileName.lastIndexOf(".") + 1);

      // 上傳文件資源類型
      String xtype = getSourceFileType(ext);
      xtype = StringUtils.isNotEmpty(xtype) == true ? xtype : "UNKWON";
      switch (type) {
      case 1:
         if (!xtype.equalsIgnoreCase("IMG")) {
            returns[0] = false;
            returns[1] = "上傳圖片文件錯誤,請重新上傳。格式為[bmp, png, gif, jpeg, jpg]";
         }
         break;
      case 2:
         if (!xtype.equalsIgnoreCase("DOC")) {
            returns[0] = false;
            returns[1] = "上傳文檔文件錯誤,請重新上傳。格式為[doc, docx]";
         }
         break;
      case 3:
         if (!xtype.equalsIgnoreCase("DOC")) {
            returns[0] = false;
            returns[1] = "上傳音頻文件錯誤,請重新上傳。格式為[rm,rmvb,mov,mtv,dat,wmv,avi,3gp,amv,dmv]";
         }
         break;
      default:
         break;
      }

      return returns;
   }
   
   public static void WriteFile(String file_name,String content,boolean append,boolean huanhang){
      try{
         BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file_name,append),"UTF-8"));
         bw.write(content);
         if(huanhang){
            bw.newLine();
         }        
          bw.flush();
          bw.close();
      }catch(Exception ex){
         ex.printStackTrace();
      }
   }
   
}