jfinal文件上傳與下載

import com.alibaba.fastjson.JSONObject;

import com.jfinal.core.Controller;

import com.jfinal.ext.kit.ZipUtil;

import com.jfinal.kit.PathKit;

import com.jfinal.upload.UploadFile;

 

import java.io.*;

import java.text.SimpleDateFormat;

import java.util.Arrays;

import java.util.Collections;

import java.util.Date;

import java.util.List;

 

public class FileController extends Controller{

     public void upload() {

         String path = new SimpleDateFormat( "yyyy/MM/dd" ).format( new Date());

         UploadFile file = getFile( "imgFile" , PathKit.getWebRootPath() + "/temp" );

         File source = file.getFile();

         String fileName = file.getFileName();

         String extension = fileName.substring(fileName.lastIndexOf( "." ));

         String prefix;

         if ( ".png" .equals(extension) || ".jpg" .equals(extension) || ".gif" .equals(extension)){

             prefix = "img" ;

             fileName = generateWord() + extension;

         } else {

             prefix = "file" ;

         }

         JSONObject json = new JSONObject();

         try {

             FileInputStream fis = new FileInputStream(source);

             File targetDir = new File(PathKit.getWebRootPath() + "/" + prefix + "/u/"

                     + path);

             if (!targetDir.exists()) {

                 targetDir.mkdirs();

             }

             File target = new File(targetDir, fileName);

             if (!target.exists()) {

                 target.createNewFile();

             }

             FileOutputStream fos = new FileOutputStream(target);

             byte [] bts = new byte [ 300 ];

             while (fis.read(bts, 0 , 300 ) != - 1 ) {

                 fos.write(bts, 0 , 300 );

             }

             fos.close();

             fis.close();

             json.put( "error" , 0 );

             json.put( "url" , "/" + prefix + "/u/" + path + "/" + fileName);

             source.delete();

         } catch (FileNotFoundException e) {

             json.put( "error" , 1 );

             json.put( "message" , "上傳出現錯誤，請稍後再上傳" );

         } catch (IOException e) {

             json.put( "error" , 1 );

             json.put( "message" , "文件寫入服務器出現錯誤，請稍後再上傳" );

         }

         renderJson(json.toJSONString());

     }

 

     public void download(){

         String path = getPara( 0 );

         String img = PathKit.getWebRootPath() + "/img/u/" + path.replaceAll( "_" , "/" );

         ZipUtil.zip(img, PathKit.getWebRootPath() + "/img/temp/" + path);

         renderFile( "/img/temp/" + path + ".zip" );

     }

 

     private String generateWord() {

         String[] beforeShuffle = new String[] { "2" , "3" , "4" , "5" , "6" , "7" ,

                 "8" , "9" , "A" , "B" , "C" , "D" , "E" , "F" , "G" , "H" , "I" , "J" ,

                 "K" , "L" , "M" , "N" , "O" , "P" , "Q" , "R" , "S" , "T" , "U" , "V" ,

                 "W" , "X" , "Y" , "Z" };

         List<String> list = Arrays.asList(beforeShuffle);

         Collections.shuffle(list);

         StringBuilder sb = new StringBuilder();

         for ( int i = 0 ; i < list.size(); i++) {

             sb.append(list.get(i));

         }

         String afterShuffle = sb.toString();

         String result = afterShuffle.substring( 5 , 9 );

         return result;

     }

 

 

http://www.oschina.net/code/snippet_2255303_43121   //原文