本文详细介绍了一个文件上传组件的实现过程，包括前端HTML页面设计、JavaScript交互逻辑、后端Controller处理逻辑及XML配置等内容。该组件支持文件上传并返回上传状态。
贴代码比较直接，要说明的是，网上下载的插件不能直接拿来用，要经过修改才能真正实现。
1、静态页面html端：
<div>
<label>信件主题：</label>
<input id="title" name="title" type="text">
</div>
<div>
<label><span>*</span>信件内容：</label>
<textarea id="content" name="content" class="input"></textarea>
</div>
<div>
<label>附 件：</label>
<input type="file" name="file" id="file" />
</div>
<div>
<button type="submit" value="提交" onclick="mailbox_submit()">提交</button>
</div>2、js端：
function mailbox_submit(){
var title=$.trim($("#title").val());
var content=$.trim($("#content").val());
$.ajaxFileUpload({
url: 'submit/upload.do',
type: 'post',
data : { <pre name="code" class="html"> title:title,
content:content
3、后端Controller代码：
@Controller
@RequestMapping("submit")
public class InteractController extends BaseController{
@Autowired
private InteractService interactService;
/**
* 用于内容新增/编辑时的ajax文件上传，将文件地址输出到页面
*
* @return
*/
@RequestMapping("/upload" )
@ResponseBody
public Map<String, Object> upload(Interact interact ,HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException {
Map<String, Object> map = new HashMap<String, Object>();
String dateStr=DateUtil.getCurrentDate_String("YYYYMMDDHH24MISS");
//创建一个通用的多部分解析器
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
//判断 request 是否有文件上传,即多部分请求
if(multipartResolver.isMultipart(request)){
//转换成多部分request
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
//取得request中的所有文件名
Iterator<String> iter = multiRequest.getFileNames();
while(iter.hasNext()){
//记录上传过程起始时的时间，用来计算上传时间
int pre = (int) System.currentTimeMillis();
//取得上传文件
MultipartFile file = multiRequest.getFile(iter.next());
if(file != null){
//取得当前上传文件的文件名称
String myFileName = file.getOriginalFilename();
//如果名称不为“”,说明该文件存在，否则说明该文件不存在
if(myFileName.trim() !=""){
System.out.println(myFileName);
//重命名上传后的文件名
String fileName = "demoUpload" + file.getOriginalFilename();
//定义上传路径
String path = "D:/" + fileName;
File localFile = new File(path);
file.transferTo(localFile);
interact.setFileid(dateStr);//文件号 可能会将这个提供给用户 作为查询编号
interact.setXjfileid(dateStr);
interact.setXjname(myFileName);//信件原文件名称（中文.doc）
interact.setXjsuffix(getExtensionName(myFileName));//文件后缀名
interact.setXjnamesave(dateStr+"."+getExtensionName(myFileName));//信件存储文件名称（201234758454.doc）
interact.setXjpath("upload/web");
map.put("status", "success");
}
}
}
}
return map;
}
/*
* Java文件操作 获取文件扩展名
*
*/
public static String getExtensionName(String filename) {
if ((filename != null) && (filename.length() > 0)) {
int dot = filename.lastIndexOf('.');
if ((dot >-1) && (dot < (filename.length() - 1))) {
return filename.substring(dot + 1);
}
}
return filename;
}
@Resource
public void setInteractService(InteractService interactService) {
this.interactService = interactService;
}
}
4、xml配置文件端：
<!-- 支持上传文件 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"></property>
<property name="maxUploadSize" value="10485760000"></property>
<property name="maxInMemorySize" value="40960"></property>
</bean> 5、这份插件代码应该是最重要的，有点长，可以全部复制：
jQuery.extend({
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
if(window.ActiveXObject) {
var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
if(typeof uri== 'boolean'){
io.src = 'javascript:false';
}
else if(typeof uri== 'string'){
io.src = uri;
}
}
else {
var io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
}
io.style.position = 'absolute';
io.style.top = '-1000px';
io.style.left = '-1000px';
document.body.appendChild(io);
return io
},
createUploadForm: function(id, fileElementId, data)
{
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
var oldElement = $('#' + fileElementId);
var newElement = $(oldElement).clone();
$(oldElement).attr('id', fileId);
$(oldElement).before(newElement);
$(oldElement).appendTo(form);
//增加文本参数的支持
if (data) {
for (var i in data) {
$('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
//set attributes
$(form).css('position', 'absolute');
$(form).css('top', '-1200px');
$(form).css('left', '-1200px');
$(form).appendTo('body');
return form;
},
ajaxFileUpload: function(s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime()
var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if ( s.global && ! jQuery.active++ )
{
jQuery.event.trigger( "ajaxStart" );
}
var requestDone = false;
// Create the request object
var xml = {}
if ( s.global )
jQuery.event.trigger("ajaxSend", [xml, s]);
// Wait for a response to come back
var uploadCallback = function(isTimeout)
{
var io = document.getElementById(frameId);
// alert("ww");
try
{
if(io.contentWindow)
{
xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
}else if(io.contentDocument)
{
xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
}
}catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if ( xml || isTimeout == "timeout")
{
requestDone = true;
var status;
// alert("eee");
try {
status = isTimeout != "timeout" ? "success" : "error";
// Make sure that the request was successful or notmodified
if ( status != "error" )
{
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData( xml, s.dataType );
// If a local callback was specified, fire it and pass it the data
if ( s.success )
s.success( data, status );
// Fire the global callback
if( s.global )
jQuery.event.trigger( "ajaxSuccess", [xml, s] );
} else
jQuery.handleError(s, xml, status);
} catch(e)
{
status = "error";
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if( s.global )
jQuery.event.trigger( "ajaxComplete", [xml, s] );
// Handle the global AJAX counter
if ( s.global && ! --jQuery.active )
jQuery.event.trigger( "ajaxStop" );
// Process result
if ( s.complete )
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function()
{ try
{
$(io).remove();
$(form).remove();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// Timeout checker
if ( s.timeout > 0 )
{
// alert("timeout")
setTimeout(function(){
// Check to see if the request is still happening
if( !requestDone ) uploadCallback( "timeout" );
}, s.timeout);
}
try
{
// var io = $('#' + frameId);
var form = $('#' + formId);
$(form).attr('action', s.url);
$(form).attr('method', 'POST');
$(form).attr('target', frameId);
if(form.encoding)
{
form.encoding = 'multipart/form-data';
}
else
{
form.enctype = 'multipart/form-data';
}
$(form).submit();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
// alert(document.getElementById(frameId));
if(window.attachEvent){
document.getElementById(frameId).attachEvent('uploadCallback');
}
else{
document.getElementById(frameId).addEventListener('load', uploadCallback, false);
}
return {abort: function () {}};
},
uploadHttpData: function( r, type ) {
// alert("uploadHttpData");
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it in global context
if ( type == "script" )
jQuery.globalEval( data );
// Get the JavaScript object, if JSON is used.
if ( type == "json" )
data = r.responseText;
var start = data.indexOf(">");
if(start != -1) {
var end = data.indexOf("<", start + 1);
if(end != -1) {
data = data.substring(start + 1, end);
}
}
eval( "data = " + data );
// evaluate scripts within html
if ( type == "html" )
jQuery("<div>").html(data).evalScripts();
//alert($('param', data).each(function(){alert($(this).attr('value'));}));
return data;
}
})6、修改该插件源码的博客出处： http://cnn237111.blog.51cto.com/2359144/505739
7、还有一个出处： 后期补上。代码真是各处整合.. 希望这份代码对你有帮助。
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