官方的版本中只有php的版本，从网上找了其他人写的内容，自己实现了一个servlet的版本，
但是又出现另一个问题，如何向后台传递参数的问题，现在整理出来，以备忘。
问题：
1、编码问题，做的示例用的gb18030，所以后台很多的转码问题，采用UTF-8，能好一些，
2、传递中文问题，最好还是前台进行encoding，(encodeURI)，后台进行解析取出来吧－－未测试
上代码：
一、前台页面index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>文件上传swfupload使用</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<link href="<%=basePath%>css/default.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="<%=basePath%>swfupload/swfupload.js"></script>
<script type="text/javascript" src="<%=basePath%>swfupload/swfupload.queue.js"></script>
<script type="text/javascript" src="<%=basePath%>js/fileprogress.js"></script>
<script type="text/javascript" src="<%=basePath%>js/handlers.js"></script>
<script type="text/javascript">
var swfu;
SWFUpload.onload = function () {
var settings = {
flash_url : "<%=basePath%>swfupload/swfupload.swf",
flash9_url : "<%=basePath%>swfupload/swfupload_fp9.swf",
upload_url: "<%=basePath%>upload",
post_params: {
"hello" : "Here I Am",
"name" : "张三"
},
file_size_limit : "100 MB",
file_types : "*.*",
file_types_description : "All Files",
file_upload_limit : 100,
file_queue_limit : 0,
custom_settings : {
progressTarget : "fsUploadProgress",
cancelButtonId : "btnCancel"
},
debug: true,
use_query_string : true,//要传递参数，必须配置,可以从后台取到参数,应该还有其他方式，如post方式，未了解
// Button Settings
button_image_url : "<%=basePath%>images/TestImageNoText_65x29.png",
button_placeholder_id : "spanButtonPlaceholder",
button_width: 61,
button_height: 22,
button_text: '浏览',
button_text_style: ".spanButtonPlaceholder { font-size: 12; }",
button_text_left_padding: 12,
button_text_top_padding: 3,
// The event handler functions are defined in handlers.js
//swfupload_preload_handler : preLoad,
//swfupload_load_failed_handler : loadFailed,
file_queued_handler : fileQueued,
file_queue_error_handler : fileQueueError,
file_dialog_complete_handler : fileDialogComplete,
upload_start_handler : uploadStart,
upload_progress_handler : uploadProgress,
upload_error_handler : uploadError,
upload_success_handler : uploadSuccess,
upload_complete_handler : uploadComplete,
queue_complete_handler : queueComplete // Queue plugin event
};
swfu = new SWFUpload(settings);
}
</script>
</head>
<body>
<div class="fieldset flash" id="fsUploadProgress">
<span class="legend">文件列表：</span>
</div>
<div id="divStatus">上传了0个文件</div>
<div class="flash" id="fsUploadProgress">
</div>
<div style="padding-left: 5px;">
<span id="spanButtonPlaceholder"></span>
<input id="btnCancel" type="button" value="取消" onclick="cancelQueue(upload);" disabled="disabled" style="margin-left: 2px; height: 22px; font-size: 8pt;" />
</div>
<!-- 上传文件列表 -->
<div class="fileList" id="fileList">
</div>
</body>
</html>二、前台接收后台返回数据的位置 －－handler.js-只需要找到该位置，进行修改就可以了
function uploadSuccess(file, serverData) {
try {
var progress = new FileProgress(file, this.customSettings.progressTarget);
progress.setComplete();
progress.setStatus("上传完成.");
progress.toggleCancel(false);
alert(serverData);
//后台传递回来的内容
var serdata = document.getElementById("fileList");
serdata.innerHTML = serverData;
} catch (ex) {
this.debug(ex);
}
}三、后台servlet-Upload.java，下边只列出了用到的doPost()方法，其他内容都没有变化
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//接收参数
String hello = request.getParameter("hello");
String name = request.getParameter("name");
name = new String(name.getBytes("ISO-8859-1"),"UTF-8");//字符编码问题，可以通过前台encoding后台再解析
System.out.println("接收参数，hello="+hello+",name="+name);
String path1 = request.getRequestURI()+"/files";
System.out.println("____________request.getRequestURI():"+path1);
String path2 = request.getSession().getServletContext().getRealPath("/");
System.out.println("_________path2:"+path2);
List<FileEntity> fileList;
fileList = (List)request.getAttribute("fileList");
if(fileList==null)
fileList = new ArrayList<FileEntity>();
//接收上传文件
String uploadSign = request.getParameter("upload");
String rootPath = request.getParameter("rootPath");
String path = request.getParameter("path");
if(rootPath == null) rootPath = "";
rootPath = rootPath.trim();
if(rootPath.equals("")){
//rootPath = application.getRealPath("/swfupload/files");//自由修改处二：指定服务器固定文件
rootPath = path2+"/files";
}
if(path == null) {
path = rootPath;
}else{
path = new String(Base64.decodeBase64(path.getBytes()));
}
System.out.println(path+"...path.getBytes():"+path.getBytes());
uploadSign = "1";
//上传操作
if(null != uploadSign && !"".equals(uploadSign)){
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
//upload.setHeaderEncoding("UTF-8");
try{
List items = upload.parseRequest(request);
if(null != items){
Iterator itr = items.iterator();
int i = 0;
while(itr.hasNext()){
FileItem item = (FileItem)itr.next();
FileEntity file = new FileEntity();//_____________________
if(item.isFormField()){
continue;
}else{
//自由修改处三：可修改上传后的文件命名方式
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddkkmmss");//以当前精确到秒的日期为上传的文件的文件名
SimpleDateFormat sdd=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String type = item.getName().split("\\.")[1];//获取文件类型
System.out.println("——————————————————文件名称："+item.getName());
System.out.println("从GBK转到UTF-8输出："+new String(item.getName().getBytes("GBK"),"UTF-8"));
File savedFile = new File(path,sdf.format(new Date())+"."+type);
//把文件放到列表中，在前台显示
System.out.println("__________________服务器上对应的文件名称："+sdf.format(new Date())+"."+type);
System.out.println("__________________完整路径："+path1+"/"+sdf.format(new Date())+"."+type);
file.setId(sdf.format(new Date()));
file.setDate(sdd.format(new Date()));
file.setFilename(item.getName());
file.setFilepath(path1+"/"+sdf.format(new Date())+"."+type);
file.setFilesize(item.getSize()+"");
file.setFiletype(type);
file.setMark("0");
fileList.add(file);
item.write(savedFile);
}
}
}
}catch(Exception e){
e.printStackTrace();
}
}
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
if(fileList!=null){
for(int i=0;i<fileList.size();i++){
FileEntity file = (FileEntity)fileList.get(i);
//out.println("文件："+ new String(file.getFilename().getBytes("GBK"),"UTF-8")+"，文件路径："+file.getFilepath());
out.println("文件："+ new String(file.getFilename().getBytes("GBK"),"UTF-8")+"，上传成功！");
}
}
}四、自定义的一个文件类FileEntity.java，测试时全部用的String类型
package com.swfupload.entity;
public class FileEntity {
private String id;
private String belong;
private String filename;
private String filepath;
private String filetype;
private String filesize;
private String date;
private String mark;
public FileEntity(){}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getBelong() {
return belong;
}
public void setBelong(String belong) {
this.belong = belong;
}
public String getFilename() {
return filename;
}
public void setFilename(String filename) {
this.filename = filename;
}
public String getFilepath() {
return filepath;
}
public void setFilepath(String filepath) {
this.filepath = filepath;
}
public String getFiletype() {
return filetype;
}
public void setFiletype(String filetype) {
this.filetype = filetype;
}
public String getFilesize() {
return filesize;
}
public void setFilesize(String filesize) {
this.filesize = filesize;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getMark() {
return mark;
}
public void setMark(String mark) {
this.mark = mark;
}
public static void main(String[] agrs){
String str="";
System.out.println(str);
}
}
来源：oschina
链接：https://my.oschina.net/u/247934/blog/64875