Spring MVC 文件上传下载

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

相关资源下载地址：

        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

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

注意，需要在头部添加内容，添加后如下所示：

<beans default-lazy-init="true"
    xmlns=""
    xmlns:p=""
     xmlns:xsi=""
    xmlns:context=""
    xmlns:mvc=""
    xsi:schemaLocation="

       /spring-beans-3.0.xsd

       /spring-mvc-3.0.xsd

       /spring-context-3.0.xsd">

(3) 添加工具类FileOperateUtil.java

/**
 *
 * @author geloin
 * @date 2012-5-5 下午12:05:57
 */
package com.geloin.spring.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;

/**
 *
 * @author geloin
 * @date 2012-5-5 下午12:05:57
 */
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 geloin
     * @date 2012-3-29 下午3:39:53
     * @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 geloin
     * @date 2012-3-29 下午6:21:32
     * @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 geloin
     * @date 2012-5-5 下午12:25:47
     * @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;
        Map<String, MultipartFile> fileMap = mRequest.getFileMap();

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

        if (!file.exists()) {
            file.mkdir();
        }

        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();

            fileName = mFile.getOriginalFilename();

            String storeName = rename(fileName);

            String noZipName = uploadDir + storeName;
            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));
            map.put(FileOperateUtil.STORENAME, zipName(storeName));
            map.put(FileOperateUtil.SIZE, new File(zipName).length());
            map.put(FileOperateUtil.SUFFIX, "zip");
            map.put(FileOperateUtil.CONTENTTYPE, "application/octet-stream");
            map.put(FileOperateUtil.CREATETIME, new Date());

            // 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 geloin
     * @date 2012-5-5 下午12:25:39
     * @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;

        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();
    }
}

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

/**
 *
 * @author geloin
 * @date 2012-5-5 上午11:56:35
 */
package com.geloin.spring.controller;

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.geloin.spring.util.FileOperateUtil;

/**
 *
 * @author geloin
 * @date 2012-5-5 上午11:56:35
 */
@Controller
@RequestMapping(value = "background/fileOperate")
public 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 ModelAndView toUpload() {
        return new ModelAndView("background/fileOperate/upload");
    }

    /**
     * 上传文件
     *
     * @author geloin
     * @date 2012-3-29 下午4:01:41
     * @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("background/fileOperate/list", map);
    }

    /**
     * 下载
     *
     * @author geloin
     * @date 2012-3-29 下午5:24:14
     * @param attachment
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    @RequestMapping(value = "download")
    public ModelAndView download(HttpServletRequest request,
            HttpServletResponse response) throws Exception {

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

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

        return null;
    }
}

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

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri=""%>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
</head>
<body>
</body>
<form enctype="multipart/form-data"
    action="/background/fileOperate/upload.html" />" method="post">
    <input type="file" name="file1" /> <input type="text" name="alais" /><br />
    <input type="file" name="file2" /> <input type="text" name="alais" /><br />
    <input type="file" name="file3" /> <input type="text" name="alais" /><br />
    <input type="submit" value="上传" />
</form>
</html>

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

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri=""%>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
</head>
<body>
    <c:forEach items="${result }" var="item">
        <c:forEach items="${item }" var="m">
            <c:if test="${m.key eq 'realName' }">
                ${m.value }
            </c:if>
            <br />
        </c:forEach>
    </c:forEach>
</body>
</html>

(7) 通过 /to_upload.html访问上传页面，通过 /fileOperate/download.html下载文件