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f663x
9年前发布

SpringMVC上传下载

springmvc上传下载功能 参照网上代码写了一个简单的例子

 

1、需要导入jar包:ant.jar、commons-fileupload.jar、connom-io.jar。当然spring jar包不可缺少的哦  我这里用的是spring+springmvc+hibernate  可以到官网上直接下载springmvcjar即可


2、springmvc.xml配置


<?xml version="1.0" encoding="UTF-8"?>  <beans xmlns="http://www.springframework.org/schema/beans"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xmlns:context="http://www.springframework.org/schema/context"   xmlns:mvc="http://www.springframework.org/schema/mvc"   xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd   http://www.springframework.org/schema/context   http://www.springframework.org/schema/context/spring-context-3.2.xsd   http://www.springframework.org/schema/mvc   http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">        <!-- 扫描包 -->  <context:component-scan base-package="com.ai.customer" />     <!-- 启动注解 -->   <mvc:annotation-driven />      <!-- 文件上传 -->   <bean id="multipartResolver"       class="org.springframework.web.multipart.commons.CommonsMultipartResolver">     <!-- 设置上传文件的最大尺寸为10MB -->       <property name="maxUploadSize">           <value>10000000</value>       </property>      </bean>        <!--  静态文件访问 -->   <mvc:default-servlet-handler/>    <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >       <property name="prefix" value="/"/>    <property name="suffix" value=".jsp"/>    </bean>      </beans>

3、web.xml配置



<servlet>      <servlet-name>spring</servlet-name>      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>      <init-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath*:config/spring/spring-*.xml</param-value>      </init-param>      <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>      <servlet-name>spring</servlet-name>      <url-pattern>*.do</url-pattern>    </servlet-mapping>  <filter>      <filter-name>codeUTF-8</filter-name>      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>      <init-param>        <param-name>encoding</param-name>        <param-value>UTF-8</param-value>      </init-param>      <init-param>        <param-name>forceEncoding</param-name>        <param-value>true</param-value>      </init-param>    </filter>    <filter-mapping>      <filter-name>codeUTF-8</filter-name>      <url-pattern>/*</url-pattern>    </filter-mapping>

4、程序代码块



package com.ai.customer.controller;    import java.io.BufferedInputStream;  import java.io.BufferedOutputStream;  import java.io.File;  import java.io.FileInputStream;  import java.io.IOException;    import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;    import org.apache.commons.fileupload.FileUpload;  import org.apache.commons.io.FileUtils;  import org.springframework.stereotype.Controller;  import org.springframework.web.bind.annotation.RequestMapping;  import org.springframework.web.bind.annotation.RequestParam;  import org.springframework.web.multipart.MultipartFile;  import org.springframework.web.servlet.ModelAndView;    @Controller  public class FileUploadController {     /*    * SpringMVC中的文件上传    * @第一步:由于SpringMVC使用的是commons-fileupload实现,故将其组件引入项目中    * @这里用到的是commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar    * @第二步:spring-mvx中配置MultipartResolver处理器。可在此加入对上传文件的属性限制    *  <bean id="multipartResolver"      *  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    *     <!-- 设置上传文件的最大尺寸为10MB -->      *        <property name="maxUploadSize">      *            <value>10000000</value>      *         </property>      * </bean>     * 第三步:在Controller的方法中添加MultipartFile参数。该参数用于接收表单中file组件的内容    *第四步:编写前台表单。注意enctype="multipart/form-data"以及<input type="file" name="****"/>    *  如果是单个文件 直接使用MultipartFile 即可    */      /**********************上传代码**************************/   @RequestMapping("/upload.do")   public ModelAndView upload(String name,     //上传多个文件     @RequestParam("file") MultipartFile[] file,     HttpServletRequest request) throws IllegalStateException,     IOException {        //获取文件 存储位置    String realPath = request.getSession().getServletContext()      .getRealPath("/uploadFile");        File pathFile = new File(realPath);        if (!pathFile.exists()) {     //文件夹不存 创建文件     pathFile.mkdirs();    }    for (MultipartFile f : file) {          System.out.println("文件类型:"+f.getContentType());     System.out.println("文件名称:"+f.getOriginalFilename());     System.out.println("文件大小:"+f.getSize());     System.out.println(".................................................");     //将文件copy上传到服务器     f.transferTo(new File(realPath + "/" + f.getOriginalFilename()));      //FileUtils.copy    }    //获取modelandview对象    ModelAndView view = new ModelAndView();    view.setViewName("redirect:index.jsp");    return view;   }            /********下载代码*************/      @RequestMapping(value = "download.do")        public ModelAndView download(HttpServletRequest request,                HttpServletResponse response) throws Exception {        //        String storeName = "Spring3.xAPI_zh.chm";         String storeName="房地.txt";          String contentType = "application/octet-stream";            FileUploadController.download(request, response, storeName, contentType);            return null;        }                    //文件下载 主要方法      public static void download(HttpServletRequest request,                HttpServletResponse response, String storeName, String contentType             ) throws Exception {                   request.setCharacterEncoding("UTF-8");            BufferedInputStream bis = null;            BufferedOutputStream bos = null;                //获取项目根目录          String ctxPath = request.getSession().getServletContext()                    .getRealPath("");                      //获取下载文件露肩          String downLoadPath = ctxPath+"/uploadFile/"+ storeName;                //获取文件的长度          long fileLength = new File(downLoadPath).length();              //设置文件输出类型          response.setContentType("application/octet-stream");            response.setHeader("Content-disposition", "attachment; filename="                    + new String(storeName.getBytes("utf-8"), "ISO8859-1"));           //设置输出长度          response.setHeader("Content-Length", String.valueOf(fileLength));            //获取输入流          bis = new BufferedInputStream(new FileInputStream(downLoadPath));            //输出流          bos = new BufferedOutputStream(response.getOutputStream());            byte[] buff = new byte[2048];            int bytesRead;            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {                bos.write(buff, 0, bytesRead);            }            //关闭流          bis.close();            bos.close();        }        }    

5、jsp页面代码 注意:设置表单中form表单的属性为:enctype="multipart/form-data"



<%@ page language="java" contentType="text/html; charset=UTF-8"      pageEncoding="UTF-8"%>  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html>  <head>  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  <title>Insert title here</title>  </head>  <body>       <form action="upload.do" method="post" enctype="multipart/form-data">       <input type="text" name="name" />    <br>    <input type="file" name="file">    <br>    <input type="file" name="file" />        <input type="submit" value="提交">   </form>      </body>  </html>