java文件上传下载使用SmartUpload组件实现

使用SmartUpload组件实现（下载jsmartcom_zh_CN.jar） 2017-11-07

1、在WebRoot创建以下文件夹，css存放样式文件(css文件直接拷贝进去)，images存放图片(图片也拷贝进去)，js存放js文件(拷贝)，jsp存放我们的jsp文件

2、创建jsp文件 01.jsp

3、编写jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <%

 String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <html>

   <head>

     <base href="<%=basePath%>">

     <title>My JSP '01.jsp' starting page</title>

     <!-- 引入我们css样式文件 -->

     <link rel="stylesheet" type="text/css" href="css/common.css">

     <!-- 引入我们js文件 -->

     <script type="text/javascript" src="js/jquery-1.11.1.js"></script>

     <script type="text/javascript">

         /*

             替换默认显示图片，显示当前我们选中的图片

             1、获取<p class="thumbs">中<a>标签事件

             2、获取href title

             3、获取<p><img id="largeImg"</p>

             4、把当前选中的href title赋给默认

         */

         $(function(){

             $(".thumbs a").click(function(){

                 var largePath = $(this).attr("href");

                 var largeAlt = $(this).attr("title");

                 $("#largeImg").attr({

                     src:largePath,

                     alt:largeAlt

                 });

                 return false;

             });

         });

     </script>

   </head>

   <body>

         <h2>文件批量上传</h2>

         <!-- 处理类路径，提交方式，类型 -->

         <form action="smartUploadServlet.do" method="post" enctype="multipart/form-data">

             <label>文件一:</label>

             <input name="myfile1" type="file"/><br>

             <label>文件二:</label>

             <input name="myfile2" type="file"/><br>

             <label>文件三:</label>

             <input name="myfile3" type="file"/><br>

             <!-- 处理完后台返回一个消息同el表达式${result} -->

             <input type="submit" value="上传文件"/><b style="color: red">${result}</b>

         </form>

         <hr>

         <h2>文件批量下载</h2>

         <!-- 处理类路径 -->

         <form action="batchDownloadServlet.do">

             <input type="checkbox" name="filename" value="img2-lg.jpg"/>Image2

             <input type="checkbox" name="filename" value="img3-lg.jpg"/>Image3

             <input type="checkbox" name="filename" value="img4-lg.jpg"/>Image4

             <input type="submit" value="下载文件"/>

         </form>
　　　　　　<!-- 
                下载：<input type="file" name="filename" value="img2-lg.jpg"/>Image2
　　       -->

         <hr>

         <h2>图片预览</h2>

         <p><img id="largeImg" alt="Large Image" src="data:images/img1-lg.jpg"></p>

         <p class="thumbs">

             <a href="images/img2-lg.jpg" title="Image2"><img src="data:images/img2-thumb.jpg"></a>

             <a href="images/img3-lg.jpg" title="Image3"><img src="data:images/img3-thumb.jpg"></a>

             <a href="images/img4-lg.jpg" title="Image4"><img src="data:images/img4-thumb.jpg"></a>

             <a href="images/img5-lg.jpg" title="Image5"><img src="data:images/img5-thumb.jpg"></a>

             <a href="images/img6-lg.jpg" title="Image6"><img src="data:images/img6-thumb.jpg"></a>

         </p>

   </body>

 </html>

4、后台创建SmartUploadServlet(上传) web.xml配置路径，jsp文件中<form action="smartUploadServlet.do">必须和web.xml中一致

 <?xml version="1.0" encoding="UTF-8"?>

 <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>scx</display-name>

   <servlet>

     <servlet-name>SmartUploadServlet</servlet-name>

     <servlet-class>com.imooc.servlet.SmartUploadServlet</servlet-class>

   </servlet>

   <servlet>

     <servlet-name>SmartDownloadServlet</servlet-name>

     <servlet-class>com.imooc.servlet.SmartDownloadServlet</servlet-class>

   </servlet>

   <servlet>

     <servlet-name>BatchDownloadServlet</servlet-name>

     <servlet-class>com.imooc.servlet.BatchDownloadServlet</servlet-class>

   </servlet>

   <servlet-mapping>

     <servlet-name>SmartUploadServlet</servlet-name>

     <url-pattern>/smartUploadServlet.do</url-pattern>

   </servlet-mapping>

   <servlet-mapping>

     <servlet-name>SmartDownloadServlet</servlet-name>

     <url-pattern>/smartDownloadServlet.do</url-pattern>

   </servlet-mapping>

   <servlet-mapping>

     <servlet-name>BatchDownloadServlet</servlet-name>

     <url-pattern>/batchDownloadServlet.do</url-pattern>

   </servlet-mapping>

   <welcome-file-list>

     <welcome-file>index.jsp</welcome-file>

   </welcome-file-list>

 </web-app>

5、编写SmartUploadServlet（多个上传，单个上传只需要把jsp文件中input留下一个）

 package com.imooc.servlet;

 import java.io.File;

 import java.io.IOException;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import com.jspsmart.upload.SmartUpload;

 public class SmartUploadServlet extends HttpServlet {

     /**

      *

      */

     private static final long serialVersionUID = 1L;

     public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         doPost(req, resp);

     }

     public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         req.setCharacterEncoding("UTF-8");

         // 设置上传的保存路径

         String filePath = getServletContext().getRealPath("/") + "images";

         // 创建文件对象 如果存在就不创建，否则创建文件夹

         File file = new File(filePath);

         if (file.exists()) {

             file.mkdir();

         }

         // 创建SmartUpload对象

         SmartUpload su = new SmartUpload();

         // 初始化对象

         su.initialize(getServletConfig(), req, resp);

         // 设置上传文件大小

         su.setTotalMaxFileSize(1024 * 1024 * 100);

         // 设置上传文件类型

         su.setAllowedFilesList("txt,jpg,gif");

         // 创建提示变量

         String result = "上传成功";

         try {

             // 设置禁止上传类型

             su.setDeniedFilesList("rar,jsp,js");

             su.upload();

             // 返回上传文件数量

             int count = su.save(filePath);

             System.out.println("上传成功" + count + "个文件！");

         } catch (Exception e) {

             result = "上传失败";

             e.printStackTrace();

         }

         // 获取上传成功的文件的属性

         for (int i = 0; i < su.getFiles().getCount(); i++) {

             com.jspsmart.upload.File tempFile = su.getFiles().getFile(i);

             System.out.println("---------------------");

             System.out.println("表单当中name属性值：" + tempFile.getFieldName());

             System.out.println("上传文件名：" + tempFile.getFieldName());

             System.out.println("上传文件长度:" + tempFile.getSize());

             System.out.println("上传文件的拓展名：" + tempFile.getFileExt());

             System.out.println("上传文件的全名：" + tempFile.getFilePathName());

             System.out.println("---------------------");

         }

         req.setAttribute("result", result);

         req.getRequestDispatcher("jsp/01.jsp").forward(req, resp);

     }

 }

6、SmartDownloadServlet（单个下载）

 package com.imooc.servlet;

 import java.io.IOException;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import com.jspsmart.upload.SmartUpload;

 import com.jspsmart.upload.SmartUploadException;

 public class SmartDownloadServlet extends HttpServlet {

     /**

      *

      */

     private static final long serialVersionUID = 1L;

     public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         doPost(request, response);

     }

     public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         // 获取文件名称

         String filename = request.getParameter("filename");

         SmartUpload su = new SmartUpload();

         // 初始化

         su.initialize(getServletConfig(), request, response);

         // 把默认显示方式设为空

         su.setContentDisposition(null);

         try {

             su.downloadFile("/images/" + filename);

         } catch (SmartUploadException e) {

             e.printStackTrace();

         }

     }

 }
7、BatchDownloadServlet（多个文件下载）

 package com.imooc.servlet;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.IOException;

 import java.util.zip.ZipEntry;

 import java.util.zip.ZipOutputStream;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 public class BatchDownloadServlet extends HttpServlet {

     /**

      *

      */

     private static final long serialVersionUID = 1L;

     public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         doPost(req, resp);

     }

     public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         resp.setContentType("application/x-msdownload");

         // 以附件的形式下载

         resp.setHeader("Content-Disposition", "attachment;filename=test.zip");

         // 获取下载路径

         String path = getServletContext().getRealPath("/") + "images/";

         // 获取文件数组

         String[] filenames = req.getParameterValues("filename");

         // 创建空字符串

         String str = "";

         // 换行符

         String rt = "\r\n";

         // 创建压缩包输出流

         ZipOutputStream zos = new ZipOutputStream(resp.getOutputStream());

         // 遍历文件数组

         for (String filename : filenames) {

             str += filename + rt;

             // 创建文件对象

             File file = new File(path + filename);

             zos.putNextEntry(new ZipEntry(filename));

             // 创建文件输出流

             FileInputStream fis = new FileInputStream(file);

             byte[] b = new byte[1024];

             int n = 0;

             while ((n = fis.read(b)) != -1) {

                 zos.write(b, 0, n);

             }

             zos.flush();

             fis.close();

         }

         zos.setComment("成功" + rt + str);

         zos.flush();

         zos.close();

     }

 }

效果图

巴特西

java文件上传下载使用SmartUpload组件实现

使用SmartUpload组件实现（下载jsmartcom_zh_CN.jar） 2017-11-07

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巴特西

java文件上传下载 使用SmartUpload组件实现

使用SmartUpload组件实现（下载jsmartcom_zh_CN.jar） 2017-11-07

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java文件上传下载使用SmartUpload组件实现