struts1+ajax+jquery上传文件

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

<script type="text/javascript">
$(document).ready(function(){
$("#billfilesubmit").click(function(){  
  var elementIds=[];
   $.ajaxFileUpload({
      url:'<%=request.getContextPath()%>/electronic/managerBusinessSave.do',
      type: 'post',
      secureuri:false,
      fileElementId:'billfile',
      dataType:'json',
      elementIds: elementIds, //传递参数到服务器
      success:function(data,status){
       if(typeof(data.error)!='undefined'){
         if(data.error !=''){
           alert(data.error);
         }else{
           alert(data.msg);
         }
       }
      },
      error:function(data,status,e){
       alert(e);
      }
   });
});
});

 

</script>

 <input  id="billfile" type="file" name="billfile" style="width: 200px;height: 20px"></input>

 <input type="button" name="billfilesubmit" id="billfilesubmit" value="上传"></input>

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.flushBuf
4000
fer();
} 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：

<action path="/electronic/managerBusiness" type="com.bmcc.adc.si.back.electronic.action.CallBillInfoAction" name="uploadBillForm" scope="request" roles="14000" functionID="14000">
<forward name="success" path="electronic_upload" />
</action>
<action path="/electronic/managerBusinessSave" type="com.bmcc.adc.si.back.electronic.action.CallBillInfoSubmitAction" name="uploadBillForm" scope="request" roles="14000" functionID="14000">
<forward name="success" path="sub_success" />
</action>

4:过滤文件大小 struts-config.xml

<controller  maxFileSize="8M" inputForward="true">
<set-property  property="processorClass"
  value="org.apache.struts.tiles.TilesRequestProcessor"/>
</controller>

    <message-resources parameter ="com.bmcc.adc.si.back.electronic.form.UploadResources" />

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] );
}

});