5.jfinal上传下载文件

建立jfinal工程使用jetty运行
工程结构如下(注意要导入cosjar包）

DemoConfig.java类

package com.cjq.config;

import com.cjq.controller.FileController;
import com.jfinal.config.Constants;
import com.jfinal.config.Handlers;
import com.jfinal.config.Interceptors;
import com.jfinal.config.JFinalConfig;
import com.jfinal.config.Plugins;
import com.jfinal.config.Routes;
import com.jfinal.core.JFinal;
import com.jfinal.plugin.redis.RedisPlugin;
import com.jfinal.render.ViewType;

public class DemoConfig extends JFinalConfig{
    @Override
    public void configConstant(Constants arg0) {
        arg0.setViewType(ViewType.JSP);
    }
    @Override
    public void configHandler(Handlers arg0) {
    }
    @Override
    public void configInterceptor(Interceptors arg0) {
    }
    @Override
    public void configPlugin(Plugins arg0) {

    }
    @Override
    public void configRoute(Routes arg0) {
        arg0.add("file",FileController.class,"file");

    }
    public static void main(String[] args) {
        JFinal.start("WebContent", 80, "/", 5);
    }

}

web.xml

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>jfinal_demodisplay-name>
    <filter>
        <filter-name>jfinalfilter-name>
        <filter-class>com.jfinal.core.JFinalFilterfilter-class>
        <init-param>
            <param-name>configClassparam-name>
            <param-value>com.cjq.config.DemoConfigparam-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>jfinalfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>
web-app>

FileService.java

package com.cjq.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class FileService {
     //文件拷贝
     public void fileChannelCopy(File s, File t) {

            FileInputStream fi = null;//文件输入流

            FileOutputStream fo = null;//文件输出流

            FileChannel in = null;

            FileChannel out = null;

            try {

                fi = new FileInputStream(s);

                fo = new FileOutputStream(t);

                in = fi.getChannel();//获取读入的文件通道

                out = fo.getChannel();//获取写出的文件通道

                in.transferTo(0, in.size(), out);// 连接两个通道，从文件输入流读取数据到文件输出流

            } catch (IOException e) {

                e.printStackTrace();

            } finally {

                try {

                    fi.close();

                    in.close();

                    fo.close();

                    out.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }
}

FileController.java

package com.cjq.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.UUID;

import com.jfinal.core.Controller;
import com.jfinal.kit.PathKit;
import com.jfinal.upload.UploadFile;

public class FileController extends Controller {

    public void index() {
        render("index.html");
    }

    public void downfile() {//文件下载

        File file = new File("G:\\Jfinal\\file\\test.png");
     //本地的一张图片
        if (file.exists()) { //如果文件存在
            renderFile(file);
        } else {
            renderJson();
        }
    }

    public void uploadFile() {//文件上传

        UploadFile uploadFile = this.getFile();//获取前台上传文件对象

        String fileName = uploadFile.getOriginalFileName();//获取文件名

        File file = uploadFile.getFile();//获取文件对象
        FileService fs = new FileService();
        File t = new File("G:\\Jfinal\\file\\" + UUID.randomUUID().toString()
                + file.getName().substring(file.getName().lastIndexOf(".")));//设置本地上传文件对象（并重命名）
        try {
            t.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        fs.fileChannelCopy(file, t);//将上传的文件的数据拷贝到本地新建的文件
        file.delete();
        this.renderHtml("success,back");
    }

}

index.html

<html>
<head>
<meta charset="UTF-8">
<title>Insert title heretitle>
head>
<body>
<form action="/file/uploadFile" enctype="multipart/form-data" method="post">
    <input type="file" name="file"/>
    <input type="submit"/>
form>

<a href="/file/downfile">下载a>
body>
html>

运行JfinalDemo类，打开浏览器访问http://localhost/file

点击选择文件上传，选择一个文件上传，我这里上传的是一张图片

点击打开

然后点提交

去本地目录下查看

点击上面页面back超链接，回到上一个地址，点击下载
（我下载的是G:\Jfinal\file\test.jpg的图片）

源码百度网盘链接：http://pan.baidu.com/s/1dFOWnp3 密码：n6au