SpringMVC 中文件的上传和下载
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在参照了网上的相关代码之后，总结了一下在springmvc框架中实现文件上传和下载的实现方法。内容如下。
jar 包
- ant.jar
- commons-fileupload-1.3.1.jar
- connom-io.jar
xml 配置
springmvcxml:
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd "> <!-- 组件扫描：扫描标记@Controller标记的类，注入到spring容器中 --> <context:component-scan base-package="com.export.action" /> <!-- 注解映射器和注解适配器可以使用<mvc:annotation-driven />代替 --> <mvc:annotation-driven /> <!-- 视图解析 解析jsp视图，默认支持jstl标签 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/page/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 设置上传文件的最大值为100MB(1024*1024*100) --> <property name="maxUploadSize"> <value>104857600</value> </property> <property name="maxInMemorySize"> <!-- 允许文件上传的最大尺寸(阈值)，低于此值，只保留在内存里，超过此阈值，生成硬盘上的临时文件 --> <value>4096</value> </property> </bean></beans>页面
文件上传的页面:fileOperate/upload.jsp
<%@ 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>文件上传</title></head><body> <form enctype="multipart/form-data" action="${pageContext.request.contextPath}/upload.action" method="post" /> <center> <input type="file" name="file1" /> 别名：<input type="text" name="alais" /> <br /> <input type="file" name="file2" /> 别名：<input type="text" name="alais" /> <br /> <input type="file" name="file3" /> 别名：<input type="text" name="alais" /> <br><br> <input type="submit" value="上传" /> </center> </form></body></html>上传成功后的页面:fileOperate/list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>上传文件列表</title></head><body> <c:forEach items="${result }" var="item"> <c:forEach items="${item }" var="m"> <c:if test="${m.key eq 'realName' }"> 上传文件名（压缩后）: ${m.value } <br /> </c:if> <c:if test="${m.key eq 'path' }"> 上传文件路径: ${m.value } <br /> </c:if> <c:if test="${m.key eq 'alais' }"> 别名: ${m.value } <br /> </c:if> </c:forEach> </c:forEach></body></html>工具类
FileOperateUtil.java:
package com.export.util;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.tools.zip.ZipEntry;import org.apache.tools.zip.ZipOutputStream;import org.springframework.util.FileCopyUtils;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;public class FileOperateUtil { private static final String REALNAME = "realName"; private static final String STORENAME = "storeName"; private static final String SIZE = "size"; private static final String SUFFIX = "suffix"; private static final String CONTENTTYPE = "contentType"; private static final String CREATETIME = "createTime"; private static final String UPLOADDIR = "uploadDir/"; /** * 将上传的文件进行重命名 * * @author zhang_cq * @param name * @return */ private static String rename(String name) { Long now = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())); Long random = (long) (Math.random() * now); String fileName = now + "" + random; if (name.indexOf(".") != -1) { fileName += name.substring(name.lastIndexOf(".")); } return fileName; } /** * 压缩后的文件名 * * @author zhang_cq * @param name * @return */ private static String zipName(String name) { String prefix = ""; if (name.indexOf(".") != -1) { prefix = name.substring(0, name.lastIndexOf(".")); } else { prefix = name; } return prefix + ".zip"; } /** * 上传文件 * * @author zhang_cq * @param request * @param params * @param values * @return * @throws Exception */ public static List<Map<String, Object>> upload(HttpServletRequest request, String[] params, Map<String, Object[]> values) throws Exception { List<Map<String, Object>> result = new ArrayList<Map<String, Object>>(); MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request; // 获得上传的文件 Map<String, MultipartFile> fileMap = mRequest.getFileMap(); // 文件上传后存放的地址 String uploadDir = request.getSession().getServletContext().getRealPath("/") + FileOperateUtil.UPLOADDIR; File file = new File(uploadDir); if (!file.exists()) { file.mkdir(); } // 文件名称 String fileName = null; int i = 0; for (Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet().iterator(); it.hasNext(); i++) { Map.Entry<String, MultipartFile> entry = it.next(); MultipartFile mFile = entry.getValue(); // 上传的文件名 fileName = mFile.getOriginalFilename(); // 将文件名重新命名 String storeName = rename(fileName); // 上传文件的路径+名称 String noZipName = uploadDir + storeName; // 压缩后的文件名 String zipName = zipName(noZipName); // 上传成为压缩文件 ZipOutputStream outputStream = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipName))); outputStream.putNextEntry(new ZipEntry(fileName)); outputStream.setEncoding("GBK"); FileCopyUtils.copy(mFile.getInputStream(), outputStream); Map<String, Object> map = new HashMap<String, Object>(); // 固定参数值对 map.put(FileOperateUtil.REALNAME, zipName(fileName)); // 图片元名 map.put(FileOperateUtil.STORENAME, zipName(storeName)); // 压缩后的名称 map.put(FileOperateUtil.SIZE, new File(zipName).length()); // 图片大小 map.put(FileOperateUtil.SUFFIX, "zip"); //后缀 map.put(FileOperateUtil.CONTENTTYPE, "application/octet-stream"); // 格式 map.put(FileOperateUtil.CREATETIME, new Date()); // 创建日期 map.put("path", uploadDir); // 自定义参数值对 for (String param : params) { map.put(param, values.get(param)[i]); } result.add(map); } return result; } /** * 下载 * * @author zhang_cq * @param request * @param response * @param storeName * @param contentType * @param realName * @throws Exception */ public static void download(HttpServletRequest request, HttpServletResponse response, String storeName, String contentType, String realName) throws Exception { response.setContentType("text/html;charset=UTF-8"); request.setCharacterEncoding("UTF-8"); BufferedInputStream bis = null; BufferedOutputStream bos = null; // 下载源路径 String ctxPath = request.getSession().getServletContext().getRealPath("/") + FileOperateUtil.UPLOADDIR; String downLoadPath = ctxPath + storeName; long fileLength = new File(downLoadPath).length(); response.setContentType(contentType); response.setHeader("Content-disposition", "attachment; filename=" + new String(realName.getBytes("utf-8"), "ISO8859-1")); response.setHeader("Content-Length", String.valueOf(fileLength)); bis = new BufferedInputStream(new FileInputStream(downLoadPath)); 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); } bis.close(); bos.close(); }}controller
FileOperateController.java
package com.export.action;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.ServletRequestUtils;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.export.util.FileOperateUtil;;/** * 文件的上传和下载 * * @author zcq12 * */@Controllerpublic class FileOperateController { /** * 到上传文件的位置 * * @author geloin * @date 2012-3-29 下午4:01:31 * @return */ @RequestMapping(value = "/to_upload") public String toUpload() { return "fileOperate/upload"; } /** * 上传文件 * * @author zhang_cq * @param request * @return * @throws Exception */ @RequestMapping(value = "/upload") public ModelAndView upload(HttpServletRequest request) throws Exception { Map<String, Object> map = new HashMap<String, Object>(); // 别名 String[] alaises = ServletRequestUtils.getStringParameters(request, "alais"); String[] params = new String[] { "alais" }; Map<String, Object[]> values = new HashMap<String, Object[]>(); values.put("alais", alaises); List<Map<String, Object>> result = FileOperateUtil.upload(request, params, values); map.put("result", result); return new ModelAndView("fileOperate/list", map); } /** * 下载 * * @author zhang_cq * @param attachment * @param request * @param response * @return * @throws Exception */ @RequestMapping(value = "download") public ModelAndView download(HttpServletRequest request, HttpServletResponse response) throws Exception { // 下载源 String storeName = "2017011821392011420519411922.zip"; // 下载之后的文件名 String realName = "myPhoto.zip"; String contentType = "application/octet-stream"; FileOperateUtil.download(request, response, storeName, contentType, realName); return null; }}至此就完成了 springmvc 中文件的上传和下载的相关功能。源码见codding
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