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Spring MVC 文件上传下载的实例

2017-3-7 12:51| 发布者: zhangjf| 查看: 991| 评论: 0

摘要: Spring MVC 文件上传下载，具体如下： (1) 导入jar包：ant.jar、commons-fileupload.jar、connom-io.jar。 (2) 在src/context/dispatcher.xml中添加 bean id=multipartResolver class=org.springframework.web.m ...

Spring MVC 文件上传下载，具体如下：

(1) 导入jar包：ant.jar、commons-fileupload.jar、connom-io.jar。

(2) 在src/context/dispatcher.xml中添加

  2. <bean id="multipartResolver"
  3. class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
  4. p:defaultEncoding="UTF-8" />
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注意，需要在头部添加内容，添加后如下所示：

  2. <beans default-lazy-init="true"
  3. xmlns="http://www.springframework.org/schema/beans"
  4. xmlns:p="http://www.springframework.org/schema/p"
  5. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  6. xmlns:context="http://www.springframework.org/schema/context"
  7. xmlns:mvc="http://www.springframework.org/schema/mvc"
  8. xsi:schemaLocation="
  9. http://www.springframework.org/schema/beans
  10. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
  11. http://www.springframework.org/schema/mvc
  12. http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
  13. http://www.springframework.org/schema/context
  14. http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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(3) 添加工具类FileOperateUtil.java

  2. /**
  3. *
  4. * @author geloin
  5. */
  6. package com.geloin.spring.util;
  8. import java.io.BufferedInputStream;
  9. import java.io.BufferedOutputStream;
  10. import java.io.File;
  11. import java.io.FileInputStream;
  12. import java.io.FileOutputStream;
  13. import java.text.SimpleDateFormat;
  14. import java.util.ArrayList;
  15. import java.util.Date;
  16. import java.util.HashMap;
  17. import java.util.Iterator;
  18. import java.util.List;
  19. import java.util.Map;
  21. import javax.servlet.http.HttpServletRequest;
  22. import javax.servlet.http.HttpServletResponse;
  24. import org.apache.tools.zip.ZipEntry;
  25. import org.apache.tools.zip.ZipOutputStream;
  26. import org.springframework.util.FileCopyUtils;
  27. import org.springframework.web.multipart.MultipartFile;
  28. import org.springframework.web.multipart.MultipartHttpServletRequest;
  30. public class FileOperateUtil {
  31. private static final String REALNAME = "realName";
  32. private static final String STORENAME = "storeName";
  33. private static final String SIZE = "size";
  34. private static final String SUFFIX = "suffix";
  35. private static final String CONTENTTYPE = "contentType";
  36. private static final String CREATETIME = "createTime";
  37. private static final String UPLOADDIR = "uploadDir/";
  39. /**
  40. * 将上传的文件进行重命名
  41. *
  42. * @param name
  43. * @return
  44. */
  45. private static String rename(String name) {
  47. Long now = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmss")
  48. .format(new Date()));
  49. Long random = (long) (Math.random() * now);
  50. String fileName = now + "" + random;
  52. if (name.indexOf(".") != -1) {
  53. fileName += name.substring(name.lastIndexOf("."));
  54. }
  56. return fileName;
  57. }
  59. /**
  60. * 压缩后的文件名
  61. *
  62. * @param name
  63. * @return
  64. */
  65. private static String zipName(String name) {
  66. String prefix = "";
  67. if (name.indexOf(".") != -1) {
  68. prefix = name.substring(0, name.lastIndexOf("."));
  69. } else {
  70. prefix = name;
  71. }
  72. return prefix + ".zip";
  73. }
  75. /**
  76. * 上传文件
  77. *
  78. * @param request
  79. * @param params
  80. * @param values
  81. * @return
  82. * @throws Exception
  83. */
  84. public static List<Map<String, Object>> upload(HttpServletRequest request,
  85. String[] params, Map<String, Object[]> values) throws Exception {
  87. List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
  89. MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
  90. Map<String, MultipartFile> fileMap = mRequest.getFileMap();
  92. String uploadDir = request.getSession().getServletContext()
  93. .getRealPath("/")
  94. + FileOperateUtil.UPLOADDIR;
  95. File file = new File(uploadDir);
  97. if (!file.exists()) {
  98. file.mkdir();
  99. }
  101. String fileName = null;
  102. int i = 0;
  103. for (Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet()
  104. .iterator(); it.hasNext(); i++) {
  106. Map.Entry<String, MultipartFile> entry = it.next();
  107. MultipartFile mFile = entry.getValue();
  109. fileName = mFile.getOriginalFilename();
  111. String storeName = rename(fileName);
  113. String noZipName = uploadDir + storeName;
  114. String zipName = zipName(noZipName);
  116. // 上传成为压缩文件
  117. ZipOutputStream outputStream = new ZipOutputStream(
  118. new BufferedOutputStream(new FileOutputStream(zipName)));
  119. outputStream.putNextEntry(new ZipEntry(fileName));
  120. outputStream.setEncoding("GBK");
  122. FileCopyUtils.copy(mFile.getInputStream(), outputStream);
  124. Map<String, Object> map = new HashMap<String, Object>();
  125. // 固定参数值对
  126. map.put(FileOperateUtil.REALNAME, zipName(fileName));
  127. map.put(FileOperateUtil.STORENAME, zipName(storeName));
  128. map.put(FileOperateUtil.SIZE, new File(zipName).length());
  129. map.put(FileOperateUtil.SUFFIX, "zip");
  130. map.put(FileOperateUtil.CONTENTTYPE, "application/octet-stream");
  131. map.put(FileOperateUtil.CREATETIME, new Date());
  133. // 自定义参数值对
  134. for (String param : params) {
  135. map.put(param, values.get(param)[i]);
  136. }
  138. result.add(map);
  139. }
  140. return result;
  141. }
  143. /**
  144. * 下载
  145. * @param request
  146. * @param response
  147. * @param storeName
  148. * @param contentType
  149. * @param realName
  150. * @throws Exception
  151. */
  152. public static void download(HttpServletRequest request,
  153. HttpServletResponse response, String storeName, String contentType,
  154. String realName) throws Exception {
  155. response.setContentType("text/html;charset=UTF-8");
  156. request.setCharacterEncoding("UTF-8");
  157. BufferedInputStream bis = null;
  158. BufferedOutputStream bos = null;
  160. String ctxPath = request.getSession().getServletContext()
  161. .getRealPath("/")
  162. + FileOperateUtil.UPLOADDIR;
  163. String downLoadPath = ctxPath + storeName;
  165. long fileLength = new File(downLoadPath).length();
  167. response.setContentType(contentType);
  168. response.setHeader("Content-disposition", "attachment; filename="
  169. + new String(realName.getBytes("utf-8"), "ISO8859-1"));
  170. response.setHeader("Content-Length", String.valueOf(fileLength));
  172. bis = new BufferedInputStream(new FileInputStream(downLoadPath));
  173. bos = new BufferedOutputStream(response.getOutputStream());
  174. byte[] buff = new byte[2048];
  175. int bytesRead;
  176. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
  177. bos.write(buff, 0, bytesRead);
  178. }
  179. bis.close();
  180. bos.close();
  181. }
  182. }
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可完全使用而不必改变该类，需要注意的是，该类中设定将上传后的文件放置在WebContent/uploadDir下。

(4) 添加FileOperateController.Java

  2. /**
  3. *
  4. * @author geloin
  5. */
  6. package com.geloin.spring.controller;
  8. import java.util.HashMap;
  9. import java.util.List;
  10. import java.util.Map;
  12. import javax.servlet.http.HttpServletRequest;
  13. import javax.servlet.http.HttpServletResponse;
  15. import org.springframework.stereotype.Controller;
  16. import org.springframework.web.bind.ServletRequestUtils;
  17. import org.springframework.web.bind.annotation.RequestMapping;
  18. import org.springframework.web.servlet.ModelAndView;
  20. import com.geloin.spring.util.FileOperateUtil;
  22. @Controller
  23. @RequestMapping(value = "background/fileOperate")
  24. public class FileOperateController {
  25. /**
  26. * 到上传文件的位置
  27. * @return
  28. */
  29. @RequestMapping(value = "to_upload")
  30. public ModelAndView toUpload() {
  31. return new ModelAndView("background/fileOperate/upload");
  32. }
  34. /**
  35. * 上传文件
  36. *
  37. * @param request
  38. * @return
  39. * @throws Exception
  40. */
  41. @RequestMapping(value = "upload")
  42. public ModelAndView upload(HttpServletRequest request) throws Exception {
  44. Map<String, Object> map = new HashMap<String, Object>();
  46. // 别名
  47. String[] alaises = ServletRequestUtils.getStringParameters(request,
  48. "alais");
  50. String[] params = new String[] { "alais" };
  51. Map<String, Object[]> values = new HashMap<String, Object[]>();
  52. values.put("alais", alaises);
  54. List<Map<String, Object>> result = FileOperateUtil.upload(request,
  55. params, values);
  57. map.put("result", result);
  59. return new ModelAndView("background/fileOperate/list", map);
  60. }
  62. /**
  63. * 下载
  64. *
  65. * @param attachment
  66. * @param request
  67. * @param response
  68. * @return
  69. * @throws Exception
  70. */
  71. @RequestMapping(value = "download")
  72. public ModelAndView download(HttpServletRequest request,
  73. HttpServletResponse response) throws Exception {
  75. String storeName = "201205051340364510870879724.zip";
  76. String realName = "Java设计模式.zip";
  77. String contentType = "application/octet-stream";
  79. FileOperateUtil.download(request, response, storeName, contentType,
  80. realName);
  82. return null;
  83. }
  84. }
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下载方法请自行变更，若使用数据库保存上传文件的信息时，请参考Spring MVC 整合Mybatis实例。

(5) 添加fileOperate/upload.jsp

  2. <%@ page language="java" contentType="text/html; charset=UTF-8"
  3. pageEncoding="UTF-8"%>
  4. <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
  5. <!DOCTYPE html
  6. PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  7. "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  8. <html>
  9. <head>
  10. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  11. <title>Insert title here</title>
  12. </head>
  13. <body>
  14. </body>
  15. <form enctype="multipart/form-data"
  16. action="<c:url value="/background/fileOperate/upload.html" />" method="post">
  17. <input type="file" name="file1" /> <input type="text" name="alais" /><br />
  18. <input type="file" name="file2" /> <input type="text" name="alais" /><br />
  19. <input type="file" name="file3" /> <input type="text" name="alais" /><br />
  20. <input type="submit" value="上传" />
  21. </form>
  22. </html>
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确保enctype的值为multipart/form-data；method的值为post。

(6) 添加fileOperate/list.jsp

  2. <%@ page language="java" contentType="text/html; charset=UTF-8"
  3. pageEncoding="UTF-8"%>
  4. <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
  5. <!DOCTYPE html
  6. PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  7. "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  8. <html>
  9. <head>
  10. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  11. <title>Insert title here</title>
  12. </head>
  13. <body>
  14. <c:forEach items="${result }" var="item">
  15. <c:forEach items="${item }" var="m">
  16. <c:if test="${m.key eq 'realName' }">
  17. ${m.value }
  18. </c:if>
  19. <br />
  20. </c:forEach>
  21. </c:forEach>
  22. </body>
  23. </html>
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(7) 通过http://localhost:8080/spring_test/background/fileOperate/to_upload.html访问上传页面，通过http://localhost:8080/spring_test/background/fileOperate/download.html下载文件

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持程序员之家。

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