JasperReports flash打印实现

JasperReports是一个基于Java的开源报表工具,可以在ireport中进行设计后,输出HTML,PDF,Excell,OpenOffice和Word格式。JasperReports支持applet方式打印,但是flash方式却是注释掉的。在net\sf\jasperreports\flex\view\Viewer.mxml文件中

<!--
<mx:Button width="22" toolTip="Print Report" id="btnPrintReport0"
  buttonMode="true"enabled="false" >
    <mx:icon>@Embed(source='images/print.GIF')</mx:icon>
</mx:Button>
<mx:Button width="22" toolTip="Print Report" id="btnReload"
  buttonMode="true"  enabled="true" click="btnReloadClick()">
    <mx:icon>@Embed(source='images/reload.GIF')</mx:icon>
</mx:Button>
 -->

本文主要完成JasperReports的flash打印功能,是基于JasperReports Flash Viewer 4.0.0修改,参考了网络上基于3.0版本的修改。将Viewer.mxml文件上面的文字修改为

<mx:Button width="22" toolTip="Print Report" id="btnPrintReport0"
  buttonMode="true" enabled="false" click="btnPrintReport()">
   <mx:icon>@Embed(source='images/print.GIF')</mx:icon>
</mx:Button>
<!--
<mx:Button width="22" toolTip="Print Report" id="btnReload"
  buttonMode="true" enabled="true" click="btnReloadClick()">
    <mx:icon>@Embed(source='images/reload.GIF')</mx:icon>
</mx:Button>
-->

在Viewer.mxml中找到refreshPage函数,启用打印按钮,将

if (report.pageCount > 0)
{
    var pageCanvas:PageCanvas = new  PageCanvas(report.pages[pageIndex]);
    pageCanvas.scaleX = zoomRatio;
    pageCanvas.scaleY = zoomRatio;

    pageBox.visible = false;
    pageBox.removeAllChildren();
    pageBox.addChild(pageCanvas);
    pageBox.visible = true;
}

修改为

if (report.pageCount > 0)
{
    var pageCanvas:PageCanvas = new  PageCanvas(report.pages[pageIndex]);
    pageCanvas.scaleX = zoomRatio;
    pageCanvas.scaleY = zoomRatio;

    pageBox.visible = false;
    pageBox.removeAllChildren();
    pageBox.addChild(pageCanvas);
    pageBox.visible = true;
    btnPrintReport0.enabled = true;
}

在Viewer.mxml中引入net\sf\jasperreports\flex\view\PrintMananger.as文件,以支持打印

import net.sf.jasperreports.flex.view.PrintManager;

在Viewer.mxml增加打印函数btnPrintReport

            public function  btnPrintReport():void
			{
				PrintManager.printAll(jrpxmlUrl,pageFetchSize,report);
			}

net\sf\jasperreports\flex\view\PrintMananger.as文件内容

package net.sf.jasperreports.flex.view
{
import flash.events.EventDispatcher;
import flash.events.SecurityErrorEvent;
import flash.events.Event;
import flash.events.ProgressEvent;
import mx.core.UIComponent;
import mx.collections.IList;
import mx.collections.ArrayCollection;
import net.sf.jasperreports.flex.view.PageCanvas;
import net.sf.jasperreports.flex.model.Report;
import net.sf.jasperreports.flex.xml.ReportFactory;
import flash.events.HTTPStatusEvent;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.events.IOErrorEvent;
import mx.printing.FlexPrintJobScaleType;
import mx.printing.FlexPrintJob;
import mx.core.Application;
import mx.containers.VBox;
import mx.events.FlexEvent;

public class PrintManager extends EventDispatcher
{
private var url:String;
private var urlLoader:URLLoader;
private var report:Report;
private var pageIndex:int = 0;
private var pageFetchSize:int = 1;

private var componentsToBeInitialized:int = 0;
private var pagesPrint:Array = [];

public const LOAD_PAGE:String=”loadPage”;
public const ALL_PAGE:String = “allPageLoader”;

public function PrintManager(){
super();
}

public function get url():String
{
return url;
}

public function set url(value:String):void
{
url=value;
}
public function set fetchSize(fetchSize:int):void
{
pageFetchSize = fetchSize;
}
public static function printAll(url:String,fetchSize:int,report:Report):void
{
var pm:PrintManager = new PrintManager();
pm.url = url;
pm.pageFetchSize = fetchSize;
pm.report = report;
pm.loadAll();
}
private function loadAll():void
{
this.addEventListener(LOAD_PAGE, onLoadPage);
this.addEventListener(ALL_PAGE, onAllPageLoaded);
pageIndex=0;

if (report)
{
var loadFlag:Boolean=false;
while (pageIndex < report.pageCount) { if (!report.pages[pageIndex]) { loadFlag=true; break; } pageIndex++; } } if (loadFlag) { loadPage(); } else{ removeEventListener(LOAD_PAGE, onLoadPage); dispatchEvent(new Event(ALL_PAGE)); } } private function onLoadPage(e:Event):void { pageIndex++; if (pageIndex < report.pageCount) { if(!report.pages[pageIndex]){ loadPage(); } } else{ removeEventListener(LOAD_PAGE, onLoadPage); dispatchEvent(new Event(ALL_PAGE)); } } public function onAllPageLoaded(event:Event):void { var cur:int; var uc:UIComponent; var pj:*; if (report != null){ pj = new FlexPrintJob(); pj.printAsBitmap = false; if (pj.start()){ cur = 0; while (cur < report.pageCount) { uc = processPage(new PageCanvas(report.pages[cur])); Application.application.addChild(uc); pj.addObject(uc); Application.application.removeChild(uc); cur++; }; pj.send(); }; } else { }; } private function processPage(param1:PageCanvas):UIComponent{ var vbox:* = new VBox(); vbox.horizontalScrollPolicy = "off"; vbox.verticalScrollPolicy = "off"; vbox.width = report.pageWidth; vbox.height = report.pageHeight; vbox.setStyle("backgroundColor", "#FFFFFF"); vbox.addChild(param1); return (vbox); } private function loadPage():void { urlLoader=new URLLoader(); urlLoader.addEventListener(Event.COMPLETE, completeHandler); urlLoader.addEventListener(Event.OPEN, openHandler); urlLoader.addEventListener(ProgressEvent.PROGRESS, progressHandler); urlLoader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler); urlLoader.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler); urlLoader.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); if (report) { var goRight:Boolean = true; var goLeft:Boolean = true; var right:int = 0; var left:int = 0; while(goRight || goLeft) { if ( goRight && left + right + 1 < pageFetchSize && pageIndex + right + 1 < report.pageCount && !report.pages[pageIndex + right + 1] ) { right++; } else { goRight = false; } if ( goLeft && left + right + 1 < pageFetchSize && pageIndex - left - 1 >= 0
&& !report.pages[pageIndex – left – 1]
)
{
left++;
}
else
{
goLeft = false;
}
}

urlLoader.load(new URLRequest(url + “&startPage=” + (pageIndex – left) + “&endPage=” + (pageIndex + right)));
}
else
{
//first load; pageIndex == 0
urlLoader.load(new URLRequest(url + “&page=” + pageIndex));
}
}

private function completeHandler(event:Event):void
{
var newReport:Report = ReportFactory.create(XML(urlLoader.data));

var i:int;
var pages:IList;

if (report)
{
pages = report.pages;
}
else
{
//first load
report = newReport;
pages = new ArrayCollection(new Array(report.pageCount));
}

for(i = newReport.startPageIndex; i <= newReport.endPageIndex; i++) { pages[i] = newReport.pages[i - newReport.startPageIndex]; } report.pages = pages; report.startPageIndex = Math.min(report.startPageIndex, newReport.startPageIndex); report.endPageIndex = Math.max(report.endPageIndex, newReport.endPageIndex); refreshPage(); } private function openHandler(event:Event):void { trace("openHandler: " + event); } private function progressHandler(event:ProgressEvent):void { trace("progressHandler loaded:" + event.bytesLoaded + " total: " + event.bytesTotal); } private function securityErrorHandler(event:SecurityErrorEvent):void { trace("securityErrorHandler: " + event); } private function httpStatusHandler(event:HTTPStatusEvent):void { trace("httpStatusHandler: " + event); } private function ioErrorHandler(event:IOErrorEvent):void { trace("ioErrorHandler: " + event); } private function refreshPage():void { if (report) { this.dispatchEvent(new Event(this.LOAD_PAGE)); } } } } [/actionscript3] 编译Main.mxml运行,即实现打印功能,但是包含图片的打印依然打印不出来。对于这种动态图片的打印添加了等待事件完成,仍能无效,不知道有没有好的实现。
参考链接:
JasperReports Library
完成Flex报表设计、生成、打印功能
Flex 4 Printing Problem with dynamic components

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