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
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import net.sf.jasperreports.flex.view.PrintManager;
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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
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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)); } } }}?
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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个人博客原文链接：JasperReports flash打印实现