本例采用plupload+commons-fileupload包实现，源码下载地址：http://download.csdn.net/detail/lohocc/8104433
本文的代码跟提供的源码略有不同（根据项目需求后期进行加工改良），本文不介绍Http的断点续传（将在稍后的文章中进行介绍），这里只对主要代码做叙述
plupload下载地址：http://www.plupload.com/download/，这款插件可以支持多环境的多文件的上传（使用方便）
1.plupload在页面的配置
$("#uploader").pluploadQueue(
$.extend({
runtimes : runtime,//运行环境，html4，html5，flash等等，可配置多个，优先级为从前到后
url : url,//后台处理上传的Action
max_file_size : max_file_size,//文件大小限制
//设置上传字段的名称,默认情况下被设置为文件(file)
file_data_name : 'file',
unique_names : true,
multiple_queues : true,
rename:true,
filters : [ docFilter, imageFilter ],
flash_swf_url : 'scripts/platform/common/upload/plupload/plupload.flash.swf',//flash上传页面路径
init : {
//文件上传成功的时候触发
FileUploaded : function(uploader, file, response) {
if (response.response) {
files.push(file.name);
}
},
//当队列中所有文件被上传完时触发
UploadComplete : function(uploader, fs) {
alert("上传完成！");
},
//上传出错的时候触发
Error : function(l, o) {
var m = o.file, n;
if(m){
n = o.message;
if(o.details){
n += " (" + o.details + ")";
}
if (o.code == plupload.FILE_SIZE_ERROR) {
$.messager.alert('提示', m.name+'过大，上传限制：'+max_file_size+'m', 'info');
}
if (o.code == plupload.FILE_EXTENSION_ERROR) {
alert("Error: Invalid file extension: "+ m.name);
}
m.hint = n;
c("#" + m.id).attr("class","plupload_failed").find("a").css("display","block").attr("title", n);
}
}
}
}, (chunk ? {//当服务端大小限制时，分段上传
chunk_size : '1mb'
} : {})));if (ServletFileUpload.isMultipartContent(request)) {
try {
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(1024);
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
upload.setSizeMax(Long.valueOf(uploadParams.get("allow-size")) * 1024 * 1024);// 设置上传大小
List<FileItem> items = upload.parseRequest(request);
//所有文件源信息列表
List<FileUploadInfo> allFiles = new ArrayList<FileUploadInfo>();
for (FileItem item : items) {
if (!item.isFormField()) {// 如果是文件类型
String itemUploadPath = checkSaveDir(request,
item.getFieldName());
name = item.getName();// 获得文件名
String newName = UploadUtil.generatorUUIDName().concat(".").concat(
FilenameUtils.getExtension(name));//随机生成一个不重复的文件名
if (newName != null) {
File savedFile = new File(itemUploadPath, newName);
item.write(savedFile);//将上传文件写入磁盘
//这里可以做一些自定义操作，如保留文件的详细信息到数据库等等
}
} else {//处理表单中其他信息，表单字段类型数据
String itemName = item.getFieldName();
String itemValue = item.getString(request.getCharacterEncoding());//这里防止出现乱码
parameters.put(itemName, new String[] { itemValue });
}
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}文件下载的思路是单文件时直接下载，多文件则使用Zip流进行多文件打包下载
单文件下载：
public void downloadSingleFile(HttpServletResponse response,
FileUploadInfo fileUploadInfo) {
// 单文件下载，直接下载当前的文件
String filePath = fileUploadInfo.getFilePath();
String fileName = fileUploadInfo.getFileName();
try {
if (fileName != null && filePath != null) {
OutputStream out = response.getOutputStream();
File file = new File(filePath);
response.setContentType("application/x-download");
response.setContentLength((int)file.length());
response.addHeader(
"Content-Disposition",
"attachment;filename="
+ java.net.URLEncoder.encode(fileName, "UTF-8"));
BufferedInputStream buff = new BufferedInputStream(
new FileInputStream(file));
byte[] b = new byte[1024];
long k = 0;
// 该值用于计算当前实际下载了多少字节
// 开始循环下载
while (k < file.length()) {
int j = buff.read(b, 0, 1024);
k += j;
// 将写入到客户端的内存的数据,刷新到磁盘
out.write(b, 0, j);
out.flush();
}
buff.close();
out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}public void downloadMultiFile(HttpServletResponse response,
List<FileUploadInfo> fileUploadInfos) {
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
response.addHeader(
"Content-Disposition",
"attachment;filename="
+ java.net.URLEncoder.encode(
UploadUtil.getZipName(), "UTF-8"));
UploadUtil.zipFiles(fileUploadInfos, zos);
zos.flush();
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}zipFiles方法<pre name="code" class="java">public static void zipFiles(List<FileUploadInfo> infoVos, ZipOutputStream zos) throws IOException {
for (FileUploadInfo info:infoVos) {
File f= new File(info.getFilePath());
zos.putNextEntry(new ZipEntry(info.getFileName()));
BufferedInputStream fis = new BufferedInputStream(new FileInputStream(f));
byte[] buffer = new byte[fis.available()];
int r = 0;
while ((r = fis.read(buffer)) != -1) {
zos.write(buffer, 0, r);
}
fis.close();
}
}
