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SpringMVC文件上传下载
在Spring MVC的基础框架搭建起来后,我们测试了spring mvc中的返回值类型,如果你还没有搭建好springmvc的架构请参考博文->http://www.cnblogs.com/qixiaoyizhan/p/5819392.html
今天我们来讲讲spring mvc中的文件上传和下载的几种方法。
首先附上文件目录->我们需要配置的我做了记号->
一、文件上传
首先为了方便后续的操作,以及精简代码,我们在Utils包下封装一个文件上传下载的帮助类: Files_Helper_DG
1 package Utils; 2 3 import org.springframework.web.multipart.MultipartFile; 4 5 import javax.servlet.http.HttpServletRequest; 6 import javax.servlet.http.HttpServletResponse; 7 import java.io.*; 8 import java.text.SimpleDateFormat; 9 import java.util.Date;10 import java.util.UUID;11 12 /**13 * Author:qixiao14 * Time:2016年9月2日23:47:5115 */16 public final class Files_Helper_DG {17 /**18 * 私有构造方法,限制该类不能被实例化19 */20 private Files_Helper_DG() {21 throw new Error("The class Cannot be instance !");22 }23 24 /**25 * spring mvc files Upload method (transferTo method)26 * spring mvc 中的文件上传方法 trasferTo 的方式上传,参数为MultipartFile27 *28 * @param request HttpServletRequest29 * @param multipartFile MultipartFile(spring)30 * @param filePath filePath example "/files/Upload"31 * @return32 */33 public static String FilesUpload_transferTo_spring(HttpServletRequest request, MultipartFile multipartFile, String filePath) {34 //get Date path35 String DatePath = new SimpleDateFormat("yyyyMMdd").format(new Date());36 //get server path (real path)37 String savePath = request.getSession().getServletContext().getRealPath(filePath) + File.separator + DatePath;38 // if dir not exists , mkdir39 System.out.println(savePath);40 File saveDir = new File(savePath);41 if (!saveDir.exists() || !saveDir.isDirectory()) {42 //create dir43 saveDir.mkdir();44 }45 if (multipartFile != null) {46 //get files suffix47 String suffix = multipartFile.getOriginalFilename().substring(multipartFile.getOriginalFilename().lastIndexOf("."));48 //use UUID get uuid string49 String uuidName = UUID.randomUUID().toString() + suffix;// make new file name50 //filePath+fileName the complex file Name51 String fileName = savePath + File.separator + uuidName;52 //return relative Path53 String relativePath = filePath + File.separator + DatePath + File.separator + uuidName;54 try {55 //save file56 multipartFile.transferTo(new File(fileName));57 //return relative Path58 return relativePath;59 } catch (IOException e) {60 e.printStackTrace();61 return null;62 }63 } else64 return null;65 }66 67 /**68 * @param request HttpServletRequest69 * @param response HttpServletResponse70 * @param filePath example "/filesOut/Download/mst.txt"71 * @return72 */73 public static void FilesDownload_servlet(HttpServletRequest request, HttpServletResponse response, String filePath) {74 //get server path (real path)75 String realPath = request.getSession().getServletContext().getRealPath(filePath);76 File file = new File(realPath);77 String filenames = file.getName();78 InputStream inputStream;79 try {80 inputStream = new BufferedInputStream(new FileInputStream(file));81 byte[] buffer = new byte[inputStream.available()];82 inputStream.read(buffer);83 inputStream.close();84 response.reset();85 // 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称用于浏览器的下载框中自动显示的文件名86 response.addHeader("Content-Disposition", "attachment;filename=" + new String(filenames.replaceAll(" ", "").getBytes("utf-8"), "iso8859-1"));87 response.addHeader("Content-Length", "" + file.length());88 OutputStream os = new BufferedOutputStream(response.getOutputStream());89 response.setContentType("application/octet-stream");90 os.write(buffer);// 输出文件91 os.flush();92 os.close();93 } catch (Exception e) {94 e.printStackTrace();95 }96 }97 }
然后我们新建一个控制器类 FileUploadController
首先我们先展示出全部的代码,然后我们进行分步说明--->
1 package HelloSpringMVC.controller; 2 3 4 import Utils.Files_Helper_DG; 5 import org.apache.commons.fileupload.FileItem; 6 import org.apache.commons.fileupload.disk.DiskFileItemFactory; 7 import org.apache.commons.fileupload.servlet.ServletFileUpload; 8 import org.springframework.stereotype.Controller; 9 import org.springframework.web.bind.annotation.RequestMapping; 10 import org.springframework.web.bind.annotation.RequestParam; 11 import org.springframework.web.bind.annotation.ResponseBody; 12 import org.springframework.web.multipart.MultipartFile; 13 import org.springframework.web.multipart.MultipartHttpServletRequest; 14 import org.springframework.web.multipart.commons.CommonsMultipartResolver; 15 16 import javax.servlet.http.HttpServletRequest; 17 import javax.servlet.http.HttpServletResponse; 18 import java.io.*; 19 import java.util.Iterator; 20 import java.util.List; 21 22 /** 23 * Created by qixiao on 2016/8/30. 24 */ 25 @Controller 26 @RequestMapping(value = "http://www.mamicode.com/FileUpload/*") 27 public class FileUploadController { 28 29 /* 30 * 方式一 31 * 采用 fileUpload_multipartFile , file.transferTo 来保存上传的文件 32 */ 33 @RequestMapping(value = "http://www.mamicode.com/fileUpload_multipartFile") 34 @ResponseBody 35 public String fileUpload_multipartFile(HttpServletRequest request, @RequestParam("file_upload") MultipartFile multipartFile) { 36 //调用保存文件的帮助类进行保存文件,并返回文件的相对路径 37 String filePath = Files_Helper_DG.FilesUpload_transferTo_spring(request, multipartFile, "/filesOut/Upload"); 38 return "{\"TFMark\":\"true\",\"Msg\":\"upload success !\",\"filePath\":\"" + filePath + "\"}"; 39 } 40 41 /* 42 * 方式二 43 * 采用 fileUpload_multipartRequest file.transferTo 来保存上传文件 44 * 参数不写 MultipartFile multipartFile 在request请求里面直接转成multipartRequest,从multipartRequest中获取到文件流 45 */ 46 @RequestMapping(value = "http://www.mamicode.com/fileUpload_multipartRequest") 47 @ResponseBody 48 public String fileUpload_multipartRequest(HttpServletRequest request) { 49 //将request转成MultipartHttpServletRequest 50 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; 51 //页面控件的文件流,对应页面控件 input file_upload 52 MultipartFile multipartFile = multipartRequest.getFile("file_upload"); 53 //调用保存文件的帮助类进行保存文件,并返回文件的相对路径 54 String filePath = Files_Helper_DG.FilesUpload_transferTo_spring(request, multipartFile, "/filesOut/Upload"); 55 return "{\"TFMark\":\"true\",\"Msg\":\"upload success !\",\"filePath\":\"" + filePath + "\"}"; 56 } 57 58 /* 59 * 方式三 60 * 采用 CommonsMultipartResolver file.transferTo 来保存上传文件 61 * 自动扫描全部的input表单 62 */ 63 @RequestMapping(value = "http://www.mamicode.com/fileUpload_CommonsMultipartResolver") 64 @ResponseBody 65 public String fileUpload_CommonsMultipartResolver(HttpServletRequest request) { 66 //将当前上下文初始化给 CommonsMultipartResolver (多部分解析器) 67 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); 68 //检查form中是否有enctype="multipart/form-data" 69 if (multipartResolver.isMultipart(request)) { 70 //将request变成多部分request 71 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; 72 //获取multiRequest 中所有的文件名 73 Iterator iter = multipartRequest.getFileNames(); 74 while (iter.hasNext()) { 75 //一次遍历所有文件 76 MultipartFile multipartFile = multipartRequest.getFile(iter.next().toString()); 77 //调用保存文件的帮助类进行保存文件,并返回文件的相对路径 78 String fileName = Files_Helper_DG.FilesUpload_transferTo_spring(request, multipartFile, "/filesOut/Upload"); 79 System.out.println(fileName); 80 } 81 } 82 return "upload success ! "; 83 } 84 85 /* 86 * 方式四 87 * 通过流的方式上传文件 88 * @RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象 89 */ 90 @RequestMapping(value = "http://www.mamicode.com/fileUpload_stream") 91 @ResponseBody 92 public String fileUpload_stream(HttpServletRequest request) { 93 //得到上传文件的保存目录,将上传的文件存放于WEB-INF目录下,不允许外界直接访问,保证上传文件的安全 94 String savePath = request.getSession().getServletContext().getRealPath("/filesOut/Upload"); 95 File file = new File(savePath); 96 //判断上传文件的保存目录是否存在 97 if (!file.exists() && !file.isDirectory()) { 98 //创建目录 99 file.mkdir();100 }101 try {102 //使用Apache文件上传组件处理文件上传步骤:103 //1、创建一个DiskFileItemFactory工厂104 DiskFileItemFactory factory = new DiskFileItemFactory();105 //2、创建一个文件上传解析器106 ServletFileUpload upload = new ServletFileUpload(factory);107 //解决上传文件名的中文乱码108 upload.setHeaderEncoding("UTF-8");109 //3、判断提交上来的数据是否是上传表单的数据110 if (!ServletFileUpload.isMultipartContent(request)) {111 //按照传统方式获取数据112 return "is not form upload data ";113 }114 //4、使用ServletFileUpload解析器解析上传数据,解析结果返回的是一个List<FileItem>集合,每一个FileItem对应一个Form表单的输入项115 List<FileItem> list = upload.parseRequest(request);116 System.out.println("start---------");117 System.out.println(list);118 for (FileItem item : list) {119 System.out.println("begin ----");120 //如果fileitem中封装的是普通输入项的数据121 if (item.isFormField()) {122 String name = item.getFieldName();123 //解决普通输入项的数据的中文乱码问题124 String value = http://www.mamicode.com/item.getString("UTF-8");125 //value = http://www.mamicode.com/new String(value.getBytes("iso8859-1"),"UTF-8");126 System.out.println(name + "=" + value);127 } else {//如果fileitem中封装的是上传文件128 //得到上传的文件名称,129 String filename = item.getName();130 System.out.println(filename);131 if (filename == null || filename.trim().equals("")) {132 continue;133 }134 //注意:不同的浏览器提交的文件名是不一样的,有些浏览器提交上来的文件名是带有路径的,如: c:\a\b\1.txt,而有些只是单纯的文件名,如:1.txt135 //处理获取到的上传文件的文件名的路径部分,只保留文件名部分136 String suffix = item.getName().substring(item.getName().lastIndexOf("."));137 //获取item中的上传文件的输入流138 InputStream in = item.getInputStream();139 //创建一个文件输出流140 FileOutputStream out = new FileOutputStream(savePath + "/123" + suffix);141 //创建一个缓冲区142 byte buffer[] = new byte[1024];143 //判断输入流中的数据是否已经读完的标识144 int len = 0;145 //循环将输入流读入到缓冲区当中,(len=in.read(buffer))>0就表示in里面还有数据146 while ((len = in.read(buffer)) > 0) {147 //使用FileOutputStream输出流将缓冲区的数据写入到指定的目录(savePath + "\\" + filename)当中148 out.write(buffer, 0, len);149 }150 //关闭输入流151 in.close();152 //关闭输出流153 out.close();154 //删除处理文件上传时生成的临时文件155 item.delete();156 }157 }158 return "upload success !";159 } catch (Exception e) {160 e.printStackTrace();161 }162 return "upload fail";163 }164 165 /*166 * 多文件上传167 * 采用 MultipartFile[] multipartFile 上传文件方法168 */169 @RequestMapping(value = "http://www.mamicode.com/fileUpload_spring_list")170 @ResponseBody171 public String fileUpload_spring_list(HttpServletRequest request, @RequestParam("file_upload") MultipartFile[] multipartFile) {172 //判断file数组不能为空并且长度大于0173 if (multipartFile != null && multipartFile.length > 0) {174 //循环获取file数组中得文件175 try {176 for (int i = 0; i < multipartFile.length; i++) {177 MultipartFile file = multipartFile[i];178 //保存文件179 String fileName = Files_Helper_DG.FilesUpload_transferTo_spring(request, file, "/filesOut/Upload");180 System.out.println(fileName);181 }182 return "{\"TFMark\":\"true\",\"Msg\":\"upload success !\"}";183 } catch (Exception ee) {184 return "{\"TFMark\":\"false\",\"Msg\":\"参数传递有误!\"}";185 }186 }187 return "{\"TFMark\":\"false\",\"Msg\":\"参数传递有误!\"}";188 }189 190 /**191 * 文件下载192 *193 * @param response194 */195 @RequestMapping(value = "http://www.mamicode.com/fileDownload_servlet")196 public void fileDownload_servlet(HttpServletRequest request, HttpServletResponse response) {197 Files_Helper_DG.FilesDownload_servlet(request,response,"/filesOut/Download/mst.txt");198 }199 }
方式一:采用 fileUpload_multipartFile , file.transferTo 来保存上传的文件
1 /* 2 * 方式一 3 * 采用 fileUpload_multipartFile , file.transferTo 来保存上传的文件 4 */ 5 @RequestMapping(value = "http://www.mamicode.com/fileUpload_multipartFile") 6 @ResponseBody 7 public String fileUpload_multipartFile(HttpServletRequest request, @RequestParam("file_upload") MultipartFile multipartFile) { 8 //调用保存文件的帮助类进行保存文件,并返回文件的相对路径 9 String filePath = Files_Helper_DG.FilesUpload_transferTo_spring(request, multipartFile, "/filesOut/Upload");10 return "{\"TFMark\":\"true\",\"Msg\":\"upload success !\",\"filePath\":\"" + filePath + "\"}";11 }
方式二:采用 fileUpload_multipartRequest file.transferTo 来保存上传文件
1 @RequestMapping(value = "http://www.mamicode.com/fileUpload_multipartRequest") 2 @ResponseBody 3 public String fileUpload_multipartRequest(HttpServletRequest request) { 4 //将request转成MultipartHttpServletRequest 5 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; 6 //页面控件的文件流,对应页面控件 input file_upload 7 MultipartFile multipartFile = multipartRequest.getFile("file_upload"); 8 //调用保存文件的帮助类进行保存文件,并返回文件的相对路径 9 String filePath = Files_Helper_DG.FilesUpload_transferTo_spring(request, multipartFile, "/filesOut/Upload");10 return "{\"TFMark\":\"true\",\"Msg\":\"upload success !\",\"filePath\":\"" + filePath + "\"}";11 }
方式三:采用 CommonsMultipartResolver file.transferTo 来保存上传文件---自动扫描全部的input表单
1 @RequestMapping(value = "http://www.mamicode.com/fileUpload_CommonsMultipartResolver") 2 @ResponseBody 3 public String fileUpload_CommonsMultipartResolver(HttpServletRequest request) { 4 //将当前上下文初始化给 CommonsMultipartResolver (多部分解析器) 5 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); 6 //检查form中是否有enctype="multipart/form-data" 7 if (multipartResolver.isMultipart(request)) { 8 //将request变成多部分request 9 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;10 //获取multiRequest 中所有的文件名11 Iterator iter = multipartRequest.getFileNames();12 while (iter.hasNext()) {13 //一次遍历所有文件14 MultipartFile multipartFile = multipartRequest.getFile(iter.next().toString());15 //调用保存文件的帮助类进行保存文件,并返回文件的相对路径16 String fileName = Files_Helper_DG.FilesUpload_transferTo_spring(request, multipartFile, "/filesOut/Upload");17 System.out.println(fileName);18 }19 }20 return "upload success ! ";21 }
方式四:通过流的方式上传文件(这种方法和servlet里面上传文件的方法类似,但本人这种方法存在上传文件损坏的问题,希望大神们能帮本人解决,感激不尽!~~~)
1 @RequestMapping(value = "http://www.mamicode.com/fileUpload_stream") 2 @ResponseBody 3 public String fileUpload_stream(HttpServletRequest request) { 4 //得到上传文件的保存目录,将上传的文件存放于WEB-INF目录下,不允许外界直接访问,保证上传文件的安全 5 String savePath = request.getSession().getServletContext().getRealPath("/filesOut/Upload"); 6 File file = new File(savePath); 7 //判断上传文件的保存目录是否存在 8 if (!file.exists() && !file.isDirectory()) { 9 //创建目录10 file.mkdir();11 }12 try {13 //使用Apache文件上传组件处理文件上传步骤:14 //1、创建一个DiskFileItemFactory工厂15 DiskFileItemFactory factory = new DiskFileItemFactory();16 //2、创建一个文件上传解析器17 ServletFileUpload upload = new ServletFileUpload(factory);18 //解决上传文件名的中文乱码19 upload.setHeaderEncoding("UTF-8");20 //3、判断提交上来的数据是否是上传表单的数据21 if (!ServletFileUpload.isMultipartContent(request)) {22 //按照传统方式获取数据23 return "is not form upload data ";24 }25 //4、使用ServletFileUpload解析器解析上传数据,解析结果返回的是一个List<FileItem>集合,每一个FileItem对应一个Form表单的输入项26 List<FileItem> list = upload.parseRequest(request);27 System.out.println("start---------");28 System.out.println(list);29 for (FileItem item : list) {30 System.out.println("begin ----");31 //如果fileitem中封装的是普通输入项的数据32 if (item.isFormField()) {33 String name = item.getFieldName();34 //解决普通输入项的数据的中文乱码问题35 String value = http://www.mamicode.com/item.getString("UTF-8");36 //value = http://www.mamicode.com/new String(value.getBytes("iso8859-1"),"UTF-8");37 System.out.println(name + "=" + value);38 } else {//如果fileitem中封装的是上传文件39 //得到上传的文件名称,40 String filename = item.getName();41 System.out.println(filename);42 if (filename == null || filename.trim().equals("")) {43 continue;44 }45 //注意:不同的浏览器提交的文件名是不一样的,有些浏览器提交上来的文件名是带有路径的,如: c:\a\b\1.txt,而有些只是单纯的文件名,如:1.txt46 //处理获取到的上传文件的文件名的路径部分,只保留文件名部分47 String suffix = item.getName().substring(item.getName().lastIndexOf("."));48 //获取item中的上传文件的输入流49 InputStream in = item.getInputStream();50 //创建一个文件输出流51 FileOutputStream out = new FileOutputStream(savePath + "/123" + suffix);52 //创建一个缓冲区53 byte buffer[] = new byte[1024];54 //判断输入流中的数据是否已经读完的标识55 int len = 0;56 //循环将输入流读入到缓冲区当中,(len=in.read(buffer))>0就表示in里面还有数据57 while ((len = in.read(buffer)) > 0) {58 //使用FileOutputStream输出流将缓冲区的数据写入到指定的目录(savePath + "\\" + filename)当中59 out.write(buffer, 0, len);60 }61 //关闭输入流62 in.close();63 //关闭输出流64 out.close();65 //删除处理文件上传时生成的临时文件66 item.delete();67 }68 }69 return "upload success !";70 } catch (Exception e) {71 e.printStackTrace();72 }73 return "upload fail";74 }
多文件上传(其实是将上面的 MultipartFile 写成数组形式)
1 @RequestMapping(value = "http://www.mamicode.com/fileUpload_spring_list") 2 @ResponseBody 3 public String fileUpload_spring_list(HttpServletRequest request, @RequestParam("file_upload") MultipartFile[] multipartFile) { 4 //判断file数组不能为空并且长度大于0 5 if (multipartFile != null && multipartFile.length > 0) { 6 //循环获取file数组中得文件 7 try { 8 for (int i = 0; i < multipartFile.length; i++) { 9 MultipartFile file = multipartFile[i];10 //保存文件11 String fileName = Files_Helper_DG.FilesUpload_transferTo_spring(request, file, "/filesOut/Upload");12 System.out.println(fileName);13 }14 return "{\"TFMark\":\"true\",\"Msg\":\"upload success !\"}";15 } catch (Exception ee) {16 return "{\"TFMark\":\"false\",\"Msg\":\"参数传递有误!\"}";17 }18 }19 return "{\"TFMark\":\"false\",\"Msg\":\"参数传递有误!\"}";20 }
下面我们进行测试:
首先在webapp下新建文件夹目录/filesOut/Upload,并且新建一个/FileUpload/FileUpload.jsp
FileUpload.jsp代码如下
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 <html> 7 <head> 8 <base href="<%=basePath%>"> 9 <title>fileUpload</title>10 </head>11 <body>12 <h3>文件上传</h3><br>13 14 <h3>采用 fileUpload_multipartFile , file.transferTo 来保存上传的文件</h3>15 <form name="form1" action="/FileUpload/fileUpload_multipartFile" method="post" enctype="multipart/form-data">16 <input type="file" name="file_upload">17 <input type="submit" value="upload"/>18 </form>19 <hr>20 21 <h3>采用 fileUpload_multipartRequest file.transferTo 来保存上传文件</h3>22 <form name="form2" action="/FileUpload/fileUpload_multipartRequest" method="post" enctype="multipart/form-data">23 <input type="file" name="file_upload">24 <input type="submit" value="upload"/>25 </form>26 <hr>27 28 <h3>采用 CommonsMultipartResolver file.transferTo 来保存上传文件</h3>29 <form name="form3" action="/FileUpload/fileUpload_CommonsMultipartResolver" method="post" enctype="multipart/form-data">30 <input type="file" name="file_upload">31 <input type="submit" value="upload"/>32 </form>33 <hr>34 35 <h3>使通过流的方式上传文件--存在上传后无法使用的问题</h3>36 <form name="form4" action="/FileUpload/fileUpload_stream" method="post" enctype="multipart/form-data">37 <input type="file" name="file_upload">38 <input type="submit" value="upload"/>39 </form>40 <hr>41 42 <h3>多文件上传 采用 MultipartFile[] multipartFile 上传文件方法</h3>43 <form name="form5" action="/FileUpload/fileUpload_spring_list" method="post" enctype="multipart/form-data">44 <input type="file" name="file_upload">45 <input type="file" name="file_upload">46 <input type="file" name="file_upload">47 <input type="submit" value="upload"/>48 </form>49 <hr>50 51 <h3>通过 a 标签的方式进行文件下载</h3><br>52 <a href="<%=basePath%>filesOut/Download/mst.txt">通过 a 标签下载文件 mst.txt</a>53 <hr>54 <h3>通过 Response 文件流的方式下载文件</h3>55 <a href="/FileUpload/fileDownload_servlet">通过 文件流 的方式下载文件 mst.txt</a>56 57 </body>58 </html>
这里一定要记得在spring-servlet.xml里面配置访问静态路径方法->下面我附上spring-servlet.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:mvc="http://www.springframework.org/schema/mvc" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context-3.1.xsd10 http://www.springframework.org/schema/mvc11 http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">12 13 <!-- 启动注解驱动的Spring MVC功能,注册请求url和注解POJO类方法的映射--> 14 <mvc:annotation-driven >15 16 </mvc:annotation-driven>17 18 <!-- 启动包扫描功能,以便注册带有@Controller、@service、@repository、@Component等注解的类成为spring的bean -->19 <context:component-scan base-package="HelloSpringMVC.controller" />20 <!-- 对模型视图名称的解析,在请求时模型视图名称添加前后缀 -->21 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">22 <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>23 <property name="prefix" value="/"/> <!-- 前缀 -->24 <property name="suffix" value=".jsp"/> <!-- 后缀 -->25 </bean>26 <!-- 访问静态文件(jpg,js,css)的方法 -->27 <mvc:resources location="/files/" mapping="/files/**" />28 <mvc:resources location="/filesOut/" mapping="/filesOut/**" />29 <mvc:resources location="/scripts/" mapping="/scripts/**" />30 <mvc:resources location="/styles/" mapping="/styles/**" />31 <mvc:resources location="/Views/" mapping="/Views/**" />32 33 <!-- 多部分文件上传 -->34 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">35 <property name="maxUploadSize" value="104857600" />36 <property name="maxInMemorySize" value="4096" />37 <property name="defaultEncoding" value="UTF-8"></property>38 </bean>39 </beans>
然后我们运行tomcat进入http://localhost:8080/Views/FileUpload/FileUpload.jsp
打开后,页面如下:
我们依次选择文件->
然后依次点击upload按钮,进行文件的上传->
可见,5种上传都已经执行成功!下面我们打开文件目录查看一下上传的文件->
细心的同志们会发现使用流上传的并没有成功,这种方式仍然存在bug待调试,有成功的记得联系我哦~
那么我们其他的方式执行已经都成功了!
二、文件下载
在控制器类 FileUploadController里面继续添加代码->
1 @RequestMapping(value = "http://www.mamicode.com/fileDownload_servlet")2 public void fileDownload_servlet(HttpServletRequest request, HttpServletResponse response) {3 Files_Helper_DG.FilesDownload_servlet(request,response,"/filesOut/Download/mst.txt");4 }
这里调用了帮助类 Files_Helper_DG.FilesDownload_servlet(request,response,"/filesOut/Download/mst.txt");
然后我们进行测试->
前面我们新建的文件夹/filesOut/Download,在里面放一个文件mst.txt,代码访问的就是这个文件!
然后是我们FileUpload.jsp,前面已经拷贝过了这段代码->
1 <h3>通过 a 标签的方式进行文件下载</h3><br>2 <a href="<%=basePath%>filesOut/Download/mst.txt">通过 a 标签下载文件 mst.txt</a>3 <hr>4 <h3>通过 Response 文件流的方式下载文件</h3>5 <a href="/FileUpload/fileDownload_servlet">通过 文件流 的方式下载文件 mst.txt</a>
首先是第一种直接访问文件目录,此方式有缺陷,暴露了项目文件结构,造成安全隐患!
点击便可下载!(如果浏览器可以读取文件,则会直接浏览器打开,我们可以右键->链接另存为选择路径保存)
然后我们点击第二种下载方式->实际项目中,我们应该优先选择第二种方式,提高了安全性!
从服务器直接下载到浏览器默认的保存文件目录!(本人在F:)
到此,我们的 spring mvc 文件上传下载已经实现!
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SpringMVC文件上传下载