jfinal文件上传与下载

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", "上传出现错误，请稍后再上传");

        } catch (IOException e) {

            json.put("error", 1);

            json.put("message", "文件写入服务器出现错误，请稍后再上传");

        }

        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