一个简单的Java文件工具类

 package com.xyworkroom.ntko.util;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;

 import javax.servlet.http.HttpServletResponse;

 /**
  * 文件处理工具类
  *
  * @author xmq
  */
 public class FileUtil {

     /**
      * 下载文件
      * @param response
      * @param filePat 包括文件名如：c:/a.txt
      * @param fileName 文件名如：a.txt
      */
     public static void downFile(HttpServletResponse response,String filePath,String fileName){
         try {
             response.setCharacterEncoding("gkb");
             response.setContentType("text/plain");
             response.setHeader("Location",fileName);
             response.setHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("gb2312"),"ISO8859-1"));
             FileInputStream  fis=new FileInputStream(filePath);
             OutputStream  os=response.getOutputStream();
             byte[] buf=new byte[1024];
             int c=0;
             while((c=fis.read(buf))!=-1){
                 os.write(buf, 0, c);
             }
             os.flush();
             os.close();
             if(fis!=null){
                 fis.close();
             }
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
     /**
      * 检查文件是否存在，存在返回true
      * @param destFileName
      * @return
      */
     public static boolean checkFileIsExists(String destFileName){
         File file = new File(destFileName);
         if (file.exists()) {
             return true;
         }else{
             return false;
         }
     }
     /**
      * 复制文件
      * @param source
      * @param dest
      * @throws IOException
      */
     public static void copyFile(File source, File dest){
           InputStream input = null;
           OutputStream output = null;
           try {
               input = new FileInputStream(source);
               output = new FileOutputStream(dest);
               byte[] buf = new byte[1024];
               int bytesRead;
               while ((bytesRead = input.read(buf))>-1) {
                 output.write(buf, 0, bytesRead);
               }
               output.close();
               input.close();
           }catch(Exception e){
               e.printStackTrace();
           }
     }

     /**
      * 把输入流保存到指定文件
      * @param source
      * @param dest
      * @throws IOException
      */
     public static void saveFile(InputStream source, File dest){
           InputStream input = null;
           OutputStream output = null;
           try {
               input =source;
               output = new FileOutputStream(dest);
               byte[] buf = new byte[1024];
               int bytesRead;
               while ((bytesRead = input.read(buf))>-1) {
                 output.write(buf, 0, bytesRead);
               }
               output.close();
               input.close();
           }catch(Exception e){
               e.printStackTrace();
           }
     }
     /**
      * 创建文件
      */
     public static boolean createFile(String destFileName) {
         File file = new File(destFileName);
         if (file.exists()) {
             return false;
         }
         if (destFileName.endsWith(File.separator)) {
             return false;
         }
         if (!file.getParentFile().exists()) {
             if (!file.getParentFile().mkdirs()) {
                 return false;
             }
         }
         try {
             if (file.createNewFile()) {
                 return true;
             } else {
                 return false;
             }
         } catch (IOException e) {
             e.printStackTrace();
             return false;
         }
     }

     /**
      * 创建目录
      */
     public static boolean createDir(String destDirName) {
         File dir = new File(destDirName);
         if (dir.exists()) {
             return false;
         }
         if (!destDirName.endsWith(File.separator))
             destDirName = destDirName + File.separator;
         if (dir.mkdirs()) {
             return true;
         } else {
             return false;
         }
     }

     /**
      * 根据路径删除指定的目录或文件，无论存在与否
      */
     public static boolean DeleteFolder(String sPath) {
         boolean flag = false;
         File file = new File(sPath);
         if (!file.exists()) {
             return flag;
         } else {
             if (file.isFile()) {
                 return deleteFile(sPath);
             } else {
                 return deleteDirectory(sPath);
             }
         }
     }

     /**
      * 删除单个文件
      */
     public static boolean deleteFile(String sPath) {
         boolean flag = false;
         File file = new File(sPath);
         if (file.isFile() && file.exists()) {
             file.delete();
             flag = true;
         }
         return flag;
     }

     /**
      * 删除目录（文件夹）以及目录下的文件
      */
     public static boolean deleteDirectory(String sPath) {
         if (!sPath.endsWith(File.separator)) {
             sPath = sPath + File.separator;
         }
         File dirFile = new File(sPath);
         if (!dirFile.exists() || !dirFile.isDirectory()) {
             return false;
         }
         boolean flag = true;
         File[] files = dirFile.listFiles();
         for (int i = 0; i < files.length; i++) {
             if (files[i].isFile()) {
                 flag = deleteFile(files[i].getAbsolutePath());
                 if (!flag)
                     break;
             } else {
                 flag = deleteDirectory(files[i].getAbsolutePath());
                 if (!flag)
                     break;
             }
         }
         if (!flag)
             return false;
         if (dirFile.delete()) {
             return true;
         } else {
             return false;
         }
     }

     /*public static void main(String[] args) {
         String dir = "D:\\sgtsc_files\\393\\02\\";
         createDir(dir);
         String filename = "test1.txt";
         String subdir = "subdir";
         createDir(dir + subdir);
         createFile(dir + filename);
         createFile(dir + subdir + filename);
         DeleteFolder(dir);
     }*/

 }