jquery.uploadify-3.1+servlet实现多文件的上传和下载文件存储到BLOB中

来源：互联网发布：利拉德数据编辑：程序博客网时间：2024/05/15 12:40

1.前台页面

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>upload.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">


<link rel="stylesheet" href="/cs/queryforjiankong/js/uploadify.css" type="text/css"></link>
<script type="text/javascript" src="/cs/queryforjiankong/js/jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="/cs/queryforjiankong/js/jquery.uploadify-3.1.min.js"></script>
</head>

<body>
<h1>Uploadify Demo</h1>
<div>
<%--用来作为文件队列区域--%>
<input type="text">
<div id="fileQueue">
</div>
<input type="file" name="uploadify" id="uploadify" />
<p>
<a href="javascript:$('#uploadify').uploadify('upload')">上传</a>|
<a href="javascript:$('#uploadify').uploadify('cancel')">取消上传</a>
</p>
</div>

<script type="text/javascript">
$(function () {
$("#uploadify").uploadify({
//指定swf文件
'swf': '/cs/queryforjiankong/js/uploadify.swf',
//后台处理的页面
'uploader': '/PicUpload',
//按钮显示的文字
'buttonText': '上传图片',
//显示的高度和宽度，默认 height 30；width 120
//'height': 15,
//'width': 80,
//上传文件的类型默认为所有文件 'All Files' ; '*.*'
//在浏览窗口底部的文件类型下拉菜单中显示的文本
'fileTypeDesc': 'Image Files',
//允许上传的文件后缀
'fileTypeExts': '*.gif; *.jpg; *.png',
//发送给后台的其他参数通过formData指定

//经测试这个数据在后台获取不到，我用了url传的参数
//'formData': { 'someKey': 'someValue', 'someOtherKey': 1 },
//上传文件页面中，你想要用来作为文件队列的元素的id, 默认为false 自动生成, 不带#
'queueID': 'fileQueue',
//选择文件后自动上传
'auto': false,
//设置为true将允许多文件上传
'multi': true,
//上传成功后执行
'onUploadSuccess': function (file, data, response) {

$('#' + file.id).find('.data').html(' 上传完毕');

}
});
});
</script>
</body>
</html>

2.后台处理上传的servlet的业务方法我是把图片的信息存储到了数据库的BLOB字段中。

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Map map = new HashMap();
String cr = System.getProperty("file.separator");
String path = request.getSession().getServletContext().getRealPath("/");
if(path.lastIndexOf(cr)==path.length() - 1){
path = path.substring(0,path.length() - 1);
}

request.setCharacterEncoding("utf-8");

ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());
AnjianPDABean anjianPDABean =(AnjianPDABean) context.getBean("anjianPDABean");
String temp= path + cr + "se" + cr + "temp"; //临时目录

DiskFileUpload fu =new DiskFileUpload();

fu.setSizeMax(1*1024*1024*50); // 设置允许用户上传文件大小,单位:字节

fu.setSizeThreshold(4096); // 设置最多只允许在内存中存储的数据,单位:字节

fu.setRepositoryPath(temp); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录

//int index=0;业务处理service
BlobBL blobBL = (BlobBL)context.getBean("blobBL");
List fileItems =null;
//开始读取上传信息
try {
fileItems = fu.parseRequest(request); // 对http请求消息进行解析

} catch (Exception e) {
e.printStackTrace();
}
Iterator iterator = fileItems.iterator(); // 依次处理每个上传的文件
ImageLob lob = null;
while (iterator.hasNext()){
FileItem item = (FileItem)iterator.next();
//忽略其他不是文件域的所有表单信息是否是普通表单字段
lob = new ImageLob(imageType);
if (!item.isFormField()){
String name = item.getName(); //获取上传文件名,包括路径
name=name.substring(name.lastIndexOf(cr)+1); //从全路径中提取文件名
//
// mobileBean.saveWentiPhoto(name); //保存路径到数据库
String[] strings = name.split("-");
String filename= strings[0]; //记录id

long size = item.getSize();
if((name==null||name.equals("")) && size==0){
continue;
}

lob.setJlid(filename);//存储文件名
blobBL.saveImageLob(lob,item.get());

//存储上传的文件ID和文件名传给前台使用
map.put("fileName",name);
map.put("filePath",lob.getId());

}
}

response.setContentType("text/xml; charset=UTF-8");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
PrintWriter out = response.getWriter();
JSONObject jsonObject = JSONObject.fromObject(map);
String msg = jsonObject.toString();
out.print(msg);
out.close();
}

3.下载的servlet对应的业务方法

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String id = (String) request.getParameter("id");
ApplicationContext context = WebApplicationContextUtils
.getWebApplicationContext(request.getSession()
.getServletContext());
BlobBL blob = (BlobBL) context.getBean("blobBL");

if (id != null && !"".equals(id.trim())) {
ImageLob l = blob.getImageLob(new Integer(id.trim()));
BufferedInputStream is = null;
String fileName=l.getJlid();

//处理前台下载时文件名乱码问题
if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {
fileName = URLEncoder.encode(fileName, "UTF-8");
} else {
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
}
// 清空response
response.reset();
try {
SerializableBlob serializableBlob = (SerializableBlob) l.getImage();
java.sql.Blob javablob = serializableBlob.getWrappedBlob() ;
is = new BufferedInputStream(javablob.getBinaryStream());
byte[] buffer = new byte[1024];
int length = 0;
// 设置response的Headerresponse
response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
response.addHeader("Content-Length", "" +is.available());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
while ((length = is.read(buffer)) > 0) {
toClient.write(buffer, 0, length);
//response.getOutputStream().write(buffer, 0, length);
}

toClient.flush();
toClient.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
is.close();
}

}
}

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