JAVA文件操作常用函数

       }

　　   /**
         * 删除文件夹里面的所有文件
         * @param path String 文件夹路径 如 c:/fqf
         */
       public 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
               }
           }
       }

       /**
         * 复制单个文件
         * @param oldPath String 原文件路径 如：c:/fqf.txt
         * @param newPath String 复制后路径 如：f:/fqf.txt
         * @return boolean
         */
       public void copyFile(String oldPath, String newPath) {
           try {
               int bytesum = 0;
               int byteread = 0;
               File oldfile = new File(oldPath);
               if (oldfile.exists()) { //文件存在时
                   InputStream inStream = new FileInputStream(oldPath); //读入原文件
                   FileOutputStream fs = new FileOutputStream(newPath);
                   byte[] buffer = new byte[1444];
                   int length;
                   while ( (byteread = inStream.read(buffer)) != -1) {
                       bytesum += byteread; //字节数 文件大小
                       System.out.println(bytesum);
                       fs.write(buffer, 0, byteread);
                   }
                   inStream.close();
               }
           }
           catch (Exception e) {
               System.out.println("复制单个文件操作出错");
               e.printStackTrace();

           }

       }

       /**
         * 复制整个文件夹内容
         * @param oldPath String 原文件路径 如：c:/fqf
         * @param newPath String 复制后路径 如：f:/fqf/ff
         * @return boolean
         */
       public 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 a=new File(oldPath);
               String[] file=a.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();

           }

       }

       /**
         * 移动文件到指定目录
         * @param oldPath String 如：c:/fqf.txt
         * @param newPath String 如：d:/fqf.txt
         */
       public void moveFile(String oldPath, String newPath) {
           copyFile(oldPath, newPath);
           delFile(oldPath);

       }

       /**
         * 移动文件到指定目录
         * @param oldPath String 如：c:/fqf.txt
         * @param newPath String 如：d:/fqf.txt
         */
       public void moveFolder(String oldPath, String newPath) {
           copyFolder(oldPath, newPath);
           delFolder(oldPath);

       }
    }