• 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
  • 相关阅读:
    MongoDB 释放磁盘空间 db.runCommand({repairDatabase: 1 })
    RK 调试笔记
    RK Android7.1 拨号
    RK Android7.1 移植gt9271 TP偏移
    RK Android7.1 定制化 itvbox 盒子Launcher
    RK Android7.1 双屏显示旋转方向
    RK Android7.1 设置 内存条作假
    RK Android7.1 设置 蓝牙 已断开连接
    RK Android7.1 进入Camera2 亮度会增加
    RK 3128 调触摸屏 TP GT9XX
  • 原文地址：https://www.cnblogs.com/Struggles/p/4381554.html
Copyright © 2020-2023  润新知