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  • SpringMVC的上传和下载

    转自：http://blog.csdn.net/geloin/article/details/7537425

    相关资源下载地址：http://download.csdn.net/detail/geloin/4506561

            本文基于Spring MVC 注解，让Spring跑起来。

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

            (2) 在src/context/dispatcher.xml中添加

    1. <bean id="multipartResolver"
    2.     class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
    3.     p:defaultEncoding="UTF-8" />

    注意，需要在头部添加内容，添加后如下所示：

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


    (3) 添加工具类FileOperateUtil.java

    点击(此处)折叠或打开

    1. /**
    2.  *
    3.  * @author geloin
    4.  * @date 2012-5-5 下午12:05:57
    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. /**
    31.  *
    32.  * @author geloin
    33.  * @date 2012-5-5 下午12:05:57
    34.  */
    35. public class FileOperateUtil {
    36.     private static final String REALNAME = "realName";
    37.     private static final String STORENAME = "storeName";
    38.     private static final String SIZE = "size";
    39.     private static final String SUFFIX = "suffix";
    40.     private static final String CONTENTTYPE = "contentType";
    41.     private static final String CREATETIME = "createTime";
    42.     private static final String UPLOADDIR = "uploadDir/";

    44.     /**
    45.      * 将上传的文件进行重命名
    46.      *
    47.      * @author geloin
    48.      * @date 2012-3-29 下午3:39:53
    49.      * @param name
    50.      * @return
    51.      */
    52.     private static String rename(String name) {

    54.         Long now = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmss")
    55.                 .format(new Date()));
    56.         Long random = (long) (Math.random() * now);
    57.         String fileName = now + "" + random;

    59.         if (name.indexOf(".") != -1) {
    60.             fileName += name.substring(name.lastIndexOf("."));
    61.         }

    63.         return fileName;
    64.     }

    66.     /**
    67.      * 压缩后的文件名
    68.      *
    69.      * @author geloin
    70.      * @date 2012-3-29 下午6:21:32
    71.      * @param name
    72.      * @return
    73.      */
    74.     private static String zipName(String name) {
    75.         String prefix = "";
    76.         if (name.indexOf(".") != -1) {
    77.             prefix = name.substring(0, name.lastIndexOf("."));
    78.         } else {
    79.             prefix = name;
    80.         }
    81.         return prefix + ".zip";
    82.     }

    84.     /**
    85.      * 上传文件
    86.      *
    87.      * @author geloin
    88.      * @date 2012-5-5 下午12:25:47
    89.      * @param request
    90.      * @param params
    91.      * @param values
    92.      * @return
    93.      * @throws Exception
    94.      */
    95.     public static List<Map<String, Object>> upload(HttpServletRequest request,
    96.             String[] params, Map<String, Object[]> values) throws Exception {

    98.         List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();

    100.         MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
    101.         Map<String, MultipartFile> fileMap = mRequest.getFileMap();

    103.         String uploadDir = request.getSession().getServletContext()
    104.                 .getRealPath("/")
    105.                 + FileOperateUtil.UPLOADDIR;
    106.         File file = new File(uploadDir);

    108.         if (!file.exists()) {
    109.             file.mkdir();
    110.         }

    112.         String fileName = null;
    113.         int i = 0;
    114.         for (Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet()
    115.                 .iterator(); it.hasNext(); i++) {

    117.             Map.Entry<String, MultipartFile> entry = it.next();
    118.             MultipartFile mFile = entry.getValue();

    120.             fileName = mFile.getOriginalFilename();

    122.             String storeName = rename(fileName);

    124.             String noZipName = uploadDir + storeName;
    125.             String zipName = zipName(noZipName);

    127.             // 上传成为压缩文件
    128.             ZipOutputStream outputStream = new ZipOutputStream(
    129.                     new BufferedOutputStream(new FileOutputStream(zipName)));
    130.             outputStream.putNextEntry(new ZipEntry(fileName));
    131.             outputStream.setEncoding("GBK");

    133.             FileCopyUtils.copy(mFile.getInputStream(), outputStream);

    135.             Map<String, Object> map = new HashMap<String, Object>();
    136.             // 固定参数值对
    137.             map.put(FileOperateUtil.REALNAME, zipName(fileName));
    138.             map.put(FileOperateUtil.STORENAME, zipName(storeName));
    139.             map.put(FileOperateUtil.SIZE, new File(zipName).length());
    140.             map.put(FileOperateUtil.SUFFIX, "zip");
    141.             map.put(FileOperateUtil.CONTENTTYPE, "application/octet-stream");
    142.             map.put(FileOperateUtil.CREATETIME, new Date());

    144.             // 自定义参数值对
    145.             for (String param : params) {
    146.                 map.put(param, values.get(param)[i]);
    147.             }

    149.             result.add(map);
    150.         }
    151.         return result;
    152.     }

    154.     /**
    155.      * 下载
    156.      *
    157.      * @author geloin
    158.      * @date 2012-5-5 下午12:25:39
    159.      * @param request
    160.      * @param response
    161.      * @param storeName
    162.      * @param contentType
    163.      * @param realName
    164.      * @throws Exception
    165.      */
    166.     public static void download(HttpServletRequest request,
    167.             HttpServletResponse response, String storeName, String contentType,
    168.             String realName) throws Exception {
    169.         response.setContentType("text/html;charset=UTF-8");
    170.         request.setCharacterEncoding("UTF-8");
    171.         BufferedInputStream bis = null;
    172.         BufferedOutputStream bos = null;

    174.         String ctxPath = request.getSession().getServletContext()
    175.                 .getRealPath("/")
    176.                 + FileOperateUtil.UPLOADDIR;
    177.         String downLoadPath = ctxPath + storeName;

    179.         long fileLength = new File(downLoadPath).length();

    181.         response.setContentType(contentType);
    182.         response.setHeader("Content-disposition", "attachment; filename="
    183.                 + new String(realName.getBytes("utf-8"), "ISO8859-1"));
    184.         response.setHeader("Content-Length", String.valueOf(fileLength));

    186.         bis = new BufferedInputStream(new FileInputStream(downLoadPath));
    187.         bos = new BufferedOutputStream(response.getOutputStream());
    188.         byte[] buff = new byte[2048];
    189.         int bytesRead;
    190.         while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
    191.             bos.write(buff, 0, bytesRead);
    192.         }
    193.         bis.close();
    194.         bos.close();
    195.     }
    196. }


    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

    1. /**
    2.  *
    3.  * @author geloin
    4.  * @date 2012-5-5 上午11:56:35
    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. /**
    23.  *
    24.  * @author geloin
    25.  * @date 2012-5-5 上午11:56:35
    26.  */
    27. @Controller
    28. @RequestMapping(value = "background/fileOperate")
    29. public class FileOperateController {
    30.     /**
    31.      * 到上传文件的位置
    32.      *
    33.      * @author geloin
    34.      * @date 2012-3-29 下午4:01:31
    35.      * @return
    36.      */
    37.     @RequestMapping(value = "to_upload")
    38.     public ModelAndView toUpload() {
    39.         return new ModelAndView("background/fileOperate/upload");
    40.     }

    42.     /**
    43.      * 上传文件
    44.      *
    45.      * @author geloin
    46.      * @date 2012-3-29 下午4:01:41
    47.      * @param request
    48.      * @return
    49.      * @throws Exception
    50.      */
    51.     @RequestMapping(value = "upload")
    52.     public ModelAndView upload(HttpServletRequest request) throws Exception {

    54.         Map<String, Object> map = new HashMap<String, Object>();

    56.         // 别名
    57.         String[] alaises = ServletRequestUtils.getStringParameters(request,
    58.                 "alais");

    60.         String[] params = new String[] { "alais" };
    61.         Map<String, Object[]> values = new HashMap<String, Object[]>();
    62.         values.put("alais", alaises);

    64.         List<Map<String, Object>> result = FileOperateUtil.upload(request,
    65.                 params, values);

    67.         map.put("result", result);

    69.         return new ModelAndView("background/fileOperate/list", map);
    70.     }

    72.     /**
    73.      * 下载
    74.      *
    75.      * @author geloin
    76.      * @date 2012-3-29 下午5:24:14
    77.      * @param attachment
    78.      * @param request
    79.      * @param response
    80.      * @return
    81.      * @throws Exception
    82.      */
    83.     @RequestMapping(value = "download")
    84.     public ModelAndView download(HttpServletRequest request,
    85.             HttpServletResponse response) throws Exception {

    87.         String storeName = "201205051340364510870879724.zip";
    88.         String realName = "Java设计模式.zip";
    89.         String contentType = "application/octet-stream";

    91.         FileOperateUtil.download(request, response, storeName, contentType,
    92.                 realName);

    94.         return null;
    95.     }
    96. }


    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


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


    确保enctype的值为multipart/form-data；method的值为post。        
    (6) 添加fileOperate/list.jsp

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


    (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
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  • 原文地址：https://www.cnblogs.com/Struggles/p/4381554.html
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