Spring MVC 文件上传下载

lttXiangFangJia

2012-05-30

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本文基于Spring 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" />

(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。