java复制文件

/** 

     * 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(); 



       } 



   }