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Uploadify upload file method_javascript skills

WBOYOriginal: 2016-05-16 15:10:321559browse

Uploadify is an upload plug-in for JQuery. It achieves very good results and displays progress. However, the officially provided example is the PHP version. This article will introduce the use of Uploadify in Aspnet in detail. You can also click the link below for demonstration or download.

Let me show you the renderings first:

Modification:

It reported that the uploadify-cancel.png file could not be found. Find uploadify.css, find .uploadify-queue-item .cancel a {, and modify the file path.
Many people say that when using uploadify on chrome and Firefox, the session cannot be obtained, resulting in upload errors. You need to manually add the session id method to the parameters. But I didn’t do that here, and there was no problem uploading it in Chrome and Firefox. I don’t know why, maybe it’s because I’m using the latest version.

Key points:

The js configuration of uploadify is relatively comprehensive, and some methods and attributes can be appropriately deleted during actual use.

Under normal circumstances, only onSelect, onUploadError and onUploadSuccess can be considered for single file upload.

If it is a multi-file upload, then in addition to the single file upload, add onQueueComplete to monitor the entire queue.

Start uploading all files: $('#file_upload').uploadify('upload', '*');

Cancel upload: $('#file_upload').uploadify('cancel', parm);

parm is empty: Cancel uploading the first file.

parm is '*': cancel all uploaded files.

parm is file id: Cancel the file corresponding to the file id.

Modify some additional variables: $('#file_upload').uploadify("settings","formData",{"name1":"Chinese name","parm1":"Modified parameters"}); The parameter is json. If a variable in the json already exists, then overwrite the attribute. If not, then append the attribute.
The server-side setting encoding is: upload.setHeaderEncoding("UTF-8");, so that the parsed file name is normal Chinese. However, the parsed additional variables are garbled in Chinese, so we do a transcoding here (I always feel that the transcoding is relatively low, and I don’t know where the configuration is wrong). new String(item.getString().getBytes("iso8859-1"),"utf-8")

The server finally returns the file saving path (you can define the return content here as you like).

Steps:

Configure uploadify

<%@ page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%>
<%String path = request.getContextPath();%>
<%String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<base href="<%=basePath %>">
<title></title>
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.3/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.3/themes/icon.css">
<script type="text/javascript" src="jquery-easyui-1.4.3/jquery.min.js"></script>
<script type="text/javascript" src="jquery-easyui-1.4.3/jquery.easyui.min.js"></script>
<script type="text/javascript" src="uploadify/uploadify/jquery.uploadify.min.js"></script>
<link rel="stylesheet" type="text/css" href="uploadify/uploadify/uploadify.css" />
</head>
<script>
$(function(){
$(function() {
$(function() {
$('#file_upload').uploadify({
'uploader' : '<%=basePath%>/UploadServlet',//服务端地址
'swf' : 'uploadify/uploadify/uploadify.swf',
'buttonImage' : 'uploadify/uploadify/img/chooseFile.jpg',//重载按钮图片
'buttonClass' : 'some-class',//重载按钮样式
'height':19,//按钮宽度和高度
'width':76,
'queueID' : 'file_queue',//显示文件队列的一个div，在页面定义
'formData' : {'parm1':'参数1','year':'2016'},//附加参数，可以在upload参数中更改
'buttonText':'选择文件',//按钮显示文字，如果有图片的话，会被图片挡住
'fileSizeLimit':'1MB',//文件最大
'auto':false,//自动提交
'fileTypeExts' : '*.gif; *.jpg; *.png',//文件类型
'fileTypeDesc' : '只能上传图片',//选择文件的时候的提示信息
'multi' : true,//多选
'queueSizeLimit' : 3,//队列中文件的个数
'onSelect' : function(file) {
console.log(file);
alert("选择文件：" + file.name + "\n类型="+file.type+"\n大小="+file.size);
if(file.size>1024000){//文件太大，取消上传该文件
alert("文件大小超过限制！");
$('#file_upload').uploadify('cancel',file.id);
}
},
'onUploadSuccess' : function(file, data, response) {
alert('每个文件上传成功后触发 ' + file.name + ' was successfully uploaded with a response of ' + response + ':' + data);
},
'onUploadComplete' : function(file) {
alert('每个文件上传完成，无论对错都触发！ ' + file.name + ' finished processing.');
},
'onUploadError' : function(file, errorCode, errorMsg, errorString) {
alert('上传出错 ' + file.name + ' could not be uploaded: ' + errorString);
},
'onQueueComplete':function(queueData){
alert("队列中的所有文件上传完成后触发。
"+queueData.uploadsSuccessful+'\n'+queueData.uploadsErrored)
},
});
});
});
});
function upload(){
$('#file_upload').uploadify("settings","formData",{"name1":"中文name","parm1":"修改后的参数"});
$('#file_upload').uploadify('upload', '*');//上传所有文件
}
function cancel(){
$('#file_upload').uploadify('cancel', '*');//取消所有文件
}
function destroy(){
alert("取消upload上传，变成原来样式！");
$('#file_upload').uploadify('destroy');//destory
}
</script>
<body>
<div class="easyui-panel" title="说明" style="margin-bottom:15px">
</div>
<div class="easyui-panel" style="text-align:center;margin-bottom:15px">
<a href="javascript:void(0)" class="easyui-linkbutton" onclick="upload()">开始上传</a>
<a href="javascript:void(0)" class="easyui-linkbutton" onclick="cancel()">取消上传</a>
<a href="javascript:void(0)" class="easyui-linkbutton" onclick="destroy()">destroy</a>
<input type="file" name="file_upload" id="file_upload" />
<div id="file_queue" style="width:400px;height:10px;position:absolute;z-index:999"></div>
</div>
</body>
</html>

Server

package com.servlet;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
* Servlet implementation class UploadServlet
*/
@WebServlet(name="UploadServlet",urlPatterns="/UploadServlet")
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = -6483558339095298703L;
/**
* @see HttpServlet#HttpServlet()
*/
public UploadServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("获取session，可以根据这个session进行一些其他的判断" + request.getSession().getId());
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
String remotePath = File.separator + "download" + File.separator + sdf.format(new Date()) + File.separator;
String savePath = remotePath;
File dfile = new File(savePath);
if (!dfile.exists()) {
dfile.mkdirs();
}
DiskFileItemFactory fac = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(fac);
upload.setHeaderEncoding("UTF-8");
List<FileItem> fileList = null;
try {
fileList = upload.parseRequest(request);
} catch (FileUploadException ex) {
return;
}
Iterator<FileItem> it = fileList.iterator();
String name = "";
String extName = "";
while (it.hasNext()) {
FileItem item = it.next();
if (!item.isFormField()) {
name = item.getName();
long size = item.getSize();
String type = item.getContentType();
System.out.println("文件=" + name + " " + size + " " + type);
if (name == null || name.trim().equals("")) {
continue;
}
// 扩展名格式：
if (name.lastIndexOf(".") >= 0) {
extName = name.substring(name.lastIndexOf("."));
}
File file = null;
do {
// 生成文件名：
name = UUID.randomUUID().toString();
file = new File(savePath + name + extName);
} while (file.exists());
File saveFile = new File(savePath + name + extName);
try {
item.write(saveFile);
} catch (Exception e) {
e.printStackTrace();
}
}else if(item.isFormField()){
System.out.println("表单内容：" + item.getFieldName() + "=" + new String(item.getString().getBytes("iso8859-1"),"utf-8"));
}
}
String requestPath = remotePath + name + extName;
request.getSession().setAttribute(requestPath, requestPath);
response.getWriter().write(savePath + name + extName);
}
}

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