<!-- 4. 修改上传文件的最大大小为30M -->
<constant name="struts.multipart.maxSize" value="31457280"/><!-- 注意： action 的名称不能用关键字"fileUpload" --><action name="fileUploadAction" class="cn.itcast.e_fileupload.FileUpload"><!-- 限制运行上传的文件的类型 --><interceptor-ref name="defaultStack"><!-- 限制运行的文件的扩展名 --><param name="fileUpload.allowedExtensions">txt,jpg,jar</param><!-- 限制运行的类型   【与上面同时使用，取交集】<param name="fileUpload.allowedTypes">text/plain</param>--></interceptor-ref><result name="success">/e/success.jsp</result><!-- 配置错误视图 --><result name="input">/e/error.jsp</result></action>

package cn.itcast.e_fileupload;import java.io.File;import org.apache.commons.io.FileUtils;import com.opensymphony.xwork2.ActionSupport;public class FileUpload extends ActionSupport {// 对应表单：<input type="file" name="file1">private File file1; //根据表单中的file1得到对应的选择的需要上传的文件，// 文件名private String file1FileName;//这个是上传文件的文件名// 文件的类型(MIME)private String file1ContentType;//上传文件的类型public void setFile1(File file1) {this.file1 = file1;}public void setFile1FileName(String file1FileName) {this.file1FileName = file1FileName;}public void setFile1ContentType(String file1ContentType) {this.file1ContentType = file1ContentType;}@Overridepublic String execute() throws Exception {/******拿到上传的文件，进行处理******/// 把文件上传到upload目录// 获取上传的目录路径//String path = ServletActionContext.getServletContext().getRealPath("/upload");String path = "E:\\upload";//上传到的存储位置// 创建目标文件对象File destFile = new File(path,file1FileName);// 把上传的文件，拷贝到目标文件中
        FileUtils.copyFile(file1, destFile);return SUCCESS;}
}

package com.itheima.action;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;import javax.servlet.ServletContext;import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;
//多文件上传
//动作类作为模型
public class Upload2Action extends ActionSupport {private String name;private File[] photo;//必须是File数组或者List<File>private String[] photoFileName;//上传文件的文件名。XXXFileName固定写法private String[] photoContentType;//上传文件的MIME类型。XXXContentType固定写法public String upload() throws Exception{//完成上传ServletContext sc = ServletActionContext.getServletContext();String directory = sc.getRealPath("/files");//得到存放文件的真实目录if(photo!=null&&photo.length>0){for(int i=0;i<photo.length;i++){//构建目标文件File target = new File(directory, photoFileName[i]);FileUtils.copyFile(photo[i], target);}}return SUCCESS;}public String getName() {return name;}public void setName(String name) {this.name = name;}public File[] getPhoto() {return photo;}public void setPhoto(File[] photo) {this.photo = photo;}public String[] getPhotoFileName() {return photoFileName;}public void setPhotoFileName(String[] photoFileName) {this.photoFileName = photoFileName;}public String[] getPhotoContentType() {return photoContentType;}public void setPhotoContentType(String[] photoContentType) {this.photoContentType = photoContentType;}}

<action name="down_*" class="cn.itcast.e_fileupload.DownAction" method="{1}"><!-- 列表展示 --><result name="list">/e/list.jsp</result><!-- 下载操作 --><result name="download" type="stream"><!-- 运行下载的文件的类型:指定为所有的二进制文件类型 --><param name="contentType">application/octet-stream</param><!-- 对应的是Action中属性： 返回流的属性【其实就是getAttrInputStream()】 --><param name="inputName">attrInputStream</param><!-- 下载头，包括：浏览器显示的文件名 --><param name="contentDisposition">attachment;filename=${downFileName}</param><!-- 缓冲区大小设置 --><param name="bufferSize">1024</param></result></action>

    /*************2. 文件下载*********************/// 1. 获取要下载的文件的文件名private String fileName;public void setFileName(String fileName) {// 处理传入的参数中问题(get提交)，中文需要转码请求的url为，down_down?fileName=jstl-impl.jartry {fileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");} catch (UnsupportedEncodingException e) {throw new RuntimeException(e);}// 把处理好的文件名，赋值this.fileName = fileName;}//2. 下载提交的业务方法 (在struts.xml中配置返回stream)public String down() throws Exception {//attrInputStream = getAttrInputStream();//downFileName = getDownFileName();return "download";}// 3. 返回文件流的方法public InputStream getAttrInputStream() throws IOException {//在文件地址中返回所属文件名的文件,这个是返回的是电脑上的InputStream is = new FileInputStream(new File("E:\\upload\\",fileName));return is ;//return ServletActionContext.getServletContext().getResourceAsStream("/upload" + fileName);
    }// 4. 下载显示的文件名（浏览器显示的文件名）public String getDownFileName() {// 需要进行中文编码try {fileName = URLEncoder.encode(fileName, "UTF-8");} catch (UnsupportedEncodingException e) {throw new RuntimeException(e);}return "down_"+fileName;}

/*************2. 文件下载*********************/// 1. 获取要下载的文件的文件名private String fileName;private InputStream attrInputStream;private String downFileName; public void setAttrInputStream(InputStream attrInputStream) {this.attrInputStream = attrInputStream;}public void setDownFileName(String downFileName) {this.downFileName = downFileName;}public InputStream getAttrInputStream() {return attrInputStream;}public String getDownFileName() {return downFileName;}public void setFileName(String fileName) {// 处理传入的参数中问题(get提交)，中文需要转码请求的url为，down_down?fileName=jstl-impl.jartry {fileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");} catch (UnsupportedEncodingException e) {throw new RuntimeException(e);}// 把处理好的文件名，赋值this.fileName = fileName;}//2. 下载提交的业务方法 (在struts.xml中配置返回stream)public String down() throws Exception {downFileName = "down"+fileName;attrInputStream = new FileInputStream(new File("E:\\upload\\",fileName));//attrInputStream = getAttrInputStream();//downFileName = getDownFileName();return "download";}

 <!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->  <bean id="multipartResolver"    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <!-- 默认编码 -->  <property name="defaultEncoding" value="utf-8" />    <!-- 文件大小最大值 -->  <property name="maxUploadSize" value="10485760000" />    <!-- 内存中的最大值 -->  <property name="maxInMemorySize" value="40960" />    </bean>   

package win.qieqie.web.action;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;@Controller
@RequestMapping("/load")
public class Upload {@RequestMapping("/up")public String uploada(HttpServletRequest request,String userName) throws IOException{MultipartHttpServletRequest mreq = (MultipartHttpServletRequest)request;MultipartFile file = mreq.getFile("file1");System.out.println(userName);//表单里不为文件的数据得值String fileName = file.getOriginalFilename();SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); //保存到工程目录下/*FileOutputStream fos = new FileOutputStream(request.getSession().getServletContext().getRealPath("/")+"upload/"+sdf.format(new Date())+fileName.substring(fileName.lastIndexOf('.')));*///传送到指定得位置/*FileOutputStream fos = new FileOutputStream("E:\\upload\\"+sdf.format(new Date())+fileName.substring(fileName.lastIndexOf('.')));fos.write(file.getBytes());fos.flush();fos.close();*///下面这种方式同样可以保存到指定位置，只是速度有点慢File dest = new File("E:\\upload\\"+sdf.format(new Date())+fileName);file.transferTo(dest);return "success";}
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>下载列表</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"></head><body><table border="1" align="center"><tr><td>编号</td><td>文件名</td><td>操作</td></tr><%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><c:forEach var="fileName" items="${fileNames}" varStatus="vs"><tr><td>${vs.count }</td><td>${fileName }</td><td><!-- 构建一个url --><c:url var="url" value="/load/down"><c:param name="fileName" value="${fileName}"></c:param></c:url><a href="${url }">下载</a></td></tr></c:forEach></table></body>
</html>

@RequestMapping("list")public String list(HttpServletRequest request){//得到upload目录路径//String path = ServletActionContext.getServletContext().getRealPath("/upload");String path = "E:\\upload";// 目录对象File file  = new File(path);// 得到所有要下载的文件的文件名String[] fileNames =  file.list();// 保存request.setAttribute("fileNames", fileNames);return "list";}

@RequestMapping("down")public String download(String fileName, HttpServletRequest request, HttpServletResponse response) throws Exception{fileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");File file = new File("E:\\upload",fileName);if(file.exists()){BufferedInputStream bis = null;BufferedOutputStream bos = null;try {response.reset();request.setCharacterEncoding("UTF-8");response.setContentType("application/x-msdownload;");// 如果文件名是中文，需要进行url编码fileName = URLEncoder.encode(fileName, "UTF-8");response.setHeader("Content-disposition", "attachment; filename="+ fileName);bis = new BufferedInputStream(new FileInputStream(file));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);}} catch (Exception e) {// TODO Auto-generated catch blockLogUtil.logger.error("下载失败，出现问题");} finally {if(bis!=null){bis.close();}if(bos!=null){bos.close();}}}return null;}