struts1+ajax+jquery上传文件

来源：互联网发布：crm软件市场状况编辑：程序博客网时间：2024/04/29 18:32

项目里上传文件，都是常规form表单提交，本次有个需求需要上传，想着还是用ajax上传，用户使用起来比较好看，等待时间较短，网上查了资料，发现能够现成使用的较少，分享一下：

展现jsp：

引入文件：

<%=request.getContextPath()%>/js/jquery-1.7.1.min.js

<%=request.getContextPath()%>/js/ajaxfileupload.js

后台java逻辑：

public class CallBillInfoSubmitAction extends BaseAction {

@Override
protected ActionForward executeAction(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception, ServletException {
// TODO Auto-generated method stub
Session session = Utils.getSession(Utils.ADMIN_SESSION_NAME);
response.setContentType("text/html;charset=UTF-8");
UploadBillForm billform = (UploadBillForm)form;
//FormFile file = billform.getBillfile();
FormFile file = (FormFile) billform.getMultipartRequestHandler().getFileElements().get("billfile");
System.err.println("file===="+file);
if(file==null){
ResultVo vo = new ResultVo();
vo.setError("文件为空，请上载话单文件!");
GsonUtil.toJson(vo,response);
return null;

} .......

附：GsonUtil.java

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

import com.google.gson.GsonBuilder;

public class GsonUtil {
private static GsonBuilder build = new GsonBuilder();

public static void toJson(Object obj,HttpServletResponse resp){
try {
String out = build.create().toJson(obj);
System.err.println("json=["+out+"]");
resp.getWriter().println(out);
//resp.flushBuffer();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String toJson(Object obj){
String out = build.create().toJson(obj);
System.err.println("json=["+out+"]");
return build.create().toJson(obj);
//resp.flushBuffer();

}
}

3:配置文件配置 struts.xml：

4:过滤文件大小 struts-config.xml

其中ajaxfileupload.js文件源码：

jQuery.extend({
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
if(window.ActiveXObject)
{
if(typeof uri== 'boolean'){
iframeHtml += ' src="' + 'javascript:false' + '"';

}
else if(typeof uri== 'string'){
iframeHtml += ' src="' + uri + '"';

}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);

return jQuery('#' + frameId).get(0);
},
createUploadForm: function(id,fileElementId,data,fileElement)
{
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
if(data)
{
for(var i in data)
{
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
var oldElement;
if(fileElement == null)
oldElement = jQuery('#' + fileElementId);
else
oldElement = fileElement;

var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);

//set attributes
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(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, (typeof(s.data)=='undefined'?false:s.data),s.fileElement);//其中 fileElementId一定要和jsp页面里的对应上
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);
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;
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
{
jQuery(io).remove();
jQuery(form).remove();

} catch(e)
{
jQuery.handleError(s, xml, null, e);
}

}, 100)

xml = null

}
}
// Timeout checker
if ( s.timeout > 0 )
{
setTimeout(function(){
// Check to see if the request is still happening
if( !requestDone ) uploadCallback( "timeout" );
}, s.timeout);
}
try
{

var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if(form.encoding)
{
jQuery(form).attr('encoding', 'multipart/form-data');
}
else
{
jQuery(form).attr('enctype', 'multipart/form-data');
}
jQuery(form).submit();

} catch(e)
{
jQuery.handleError(s, xml, null, e);
}

jQuery('#' + frameId).load(uploadCallback);
return {abort: function(){
try
{
jQuery('#' + frameId).remove();
jQuery(form).remove();
}
catch(e){}
}};
},

uploadHttpData: function( r, type ) {
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" )
eval( "data = " + data );
// evaluate scripts within html
if ( type == "html" )
jQuery("<div>").html(data).evalScripts();

return data;
},

handleError: function( s, xml, status, e ) {
// If a local callback was specified, fire it
if ( s.error )
s.error( xml, status, e );

// Fire the global callback
if ( s.global )
jQuery.event.trigger( "ajaxError", [xml, s, e] );
}
});

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