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iReport+jasperReport之scriptlet

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?????????? 轉載自 http://www.blogjava.net/bulktree/archive/2008/12/17/246786.html

???????????? 提起scriptlet就不能不聯想到它的強大功能，jasperReport也是支持scriptlet的哦，先分析一下JasperReport的API吧！
在填充報表時scriplet是一個非常有力的工具，JRAbstractScriptlet.java位于net.sf.jasperreports.engine包下是一個抽象
類

iReport+jasperReport之scriptlet
beforeReportInit()?，afterReportInit()?，beforePageInit()，afterPageInit(),?beforeColumnInit(),?afterColumnInit()?,beforeGroupInit(String?groupName),afterGroupInit(String?groupName)?
看看這些名字就知道你能完成那些功能，這幾個方法是要求我們實現的，jasperReport給我們提供了一個實現類JRDefaultScriptlet.java，默認的空實現了上面幾個方法，它只是很便利的為我們提供了所需的八個方法的空實現。我們寫自己的scriptlet時需要繼承JRDefaultScriptlet.java這個類實現自己的相應的功能即可。
?先來看一個簡單的例子：
先看看模板文件的處理： iReport+jasperReport之scriptlet
新建時填寫的這個類是下面我們要介紹的繼承自JRDefaultScriptlet.java類，也就是在模板文件中我們要加上如下代碼

scriptletClass="org.bulktree.ireport.scriptlet.ScriptletReportDemo"

完整的模板文件如下：scriptletDemo.jrxml

<? xml?version="1.0"?encoding="UTF-8"?? ?>
<!-- ?Created?with?iReport?-?A?designer?for?JasperReports? -->
<! DOCTYPE?jasperReport?PUBLIC?"http://JasperReports//DTD?Report?Design//EN"?"http://jasperreports.sourceforge.net/dtds/jasperreport.dtd" >
< jasperReport
????????? name ="scriptletDemo"
?????????columnCount ="1"
?????????printOrder ="Vertical"
?????????orientation ="Portrait"
?????????pageWidth ="595"
?????????pageHeight ="842"
?????????columnWidth ="535"
?????????columnSpacing ="0"
?????????leftMargin ="30"
?????????rightMargin ="30"
?????????topMargin ="20"
?????????bottomMargin ="20"
?????????whenNoDataType ="NoPages"
?????????scriptletClass ="org.bulktree.ireport.scriptlet.ScriptletReportDemo"
?????????isTitleNewPage ="false"
?????????isSummaryNewPage ="false" >
???? < property? name ="ireport.scriptlethandling" ?value ="2" ? />
???? < property? name ="ireport.encoding" ?value ="UTF-8" ? />
???? < import? value ="java.util.*" ? />
???? < import? value ="net.sf.jasperreports.engine.*" ? />
???? < import? value ="net.sf.jasperreports.engine.data.*" ? />

???? < parameter? name ="ReportTitle" ?isForPrompting ="true" ?class ="java.lang.String" />

???????? < background >
???????????? < band? height ="0" ??isSplitAllowed ="true" ? >
???????????? </ band >
???????? </ background >
???????? < title >
???????????? < band? height ="20" ??isSplitAllowed ="true" ? >
???????????????? < textField? isStretchWithOverflow ="false" ?isBlankWhenNull ="false" ?evaluationTime ="Now" ?hyperlinkType ="None" ??hyperlinkTarget ="Self" ? >
???????????????????? < reportElement
???????????????????????? mode ="Opaque"
????????????????????????x ="193"
????????????????????????y ="0"
????????????????????????width ="134"
????????????????????????height ="18"
????????????????????????backcolor ="#FFCC33"
????????????????????????key ="textField" />
???????????????????? < box ></ box >
???????????????????? < textElement? textAlignment ="Center" ?verticalAlignment ="Middle" >
???????????????????????? < font? pdfFontName ="Helvetica-Bold" ?size ="12" ?isBold ="true" />
???????????????????? </ textElement >
???????????????? < textFieldExpression??? class ="java.lang.String" > <![CDATA[ $P{ReportTitle} ]]> </ textFieldExpression >
???????????????? </ textField >
???????????? </ band >
???????? </ title >
???????? < pageHeader >
???????????? < band? height ="0" ??isSplitAllowed ="true" ? >
???????????? </ band >
???????? </ pageHeader >
???????? < columnHeader >
???????????? < band? height ="0" ??isSplitAllowed ="true" ? >
???????????? </ band >
???????? </ columnHeader >
???????? < detail >
???????????? < band? height ="264" ??isSplitAllowed ="true" ? >
???????????????? < textField? isStretchWithOverflow ="false" ?isBlankWhenNull ="false" ?evaluationTime ="Now" ?hyperlinkType ="None" ??hyperlinkTarget ="Self" ? >
???????????????????? < reportElement
???????????????????????? x ="85"
????????????????????????y ="20"
????????????????????????width ="329"
????????????????????????height ="61"
????????????????????????forecolor ="#FF0099"
????????????????????????key ="textField-1" />
???????????????????? < box ></ box >
???????????????????? < textElement? textAlignment ="Center" ?verticalAlignment ="Middle" >
???????????????????????? < font? pdfFontName ="Helvetica-Bold" ?size ="20" ?isBold ="true" />
???????????????????? </ textElement >
???????????????? < textFieldExpression??? class ="java.lang.String" > <![CDATA[ $P{REPORT_SCRIPTLET}.showInfor() ]]> </ textFieldExpression >
???????????????? </ textField >
???????????? </ band >
???????? </ detail >
???????? < columnFooter >
???????????? < band? height ="0" ??isSplitAllowed ="true" ? >
???????????? </ band >
???????? </ columnFooter >
???????? < pageFooter >
???????????? < band? height ="0" ??isSplitAllowed ="true" ? >
???????????? </ band >
???????? </ pageFooter >
???????? < summary >
???????????? < band? height ="50" ??isSplitAllowed ="true" ? >
???????????? </ band >
???????? </ summary >
</ jasperReport >

下來看看怎么實現我們自己的scriplet

ScriptletReportDemo.java

package ?org.bulktree.ireport.scriptlet;

import ?net.sf.jasperreports.engine.JRDefaultScriptlet;
import ?net.sf.jasperreports.engine.JRScriptletException;

/**
?*?
?*? @author ?bulktree?Email:?laoshulin@gmail.com
?*?@Nov?26,?2008
? */
public ? class ?ScriptletReportDemo? extends ?JRDefaultScriptlet? {

????@Override
???? public ? void ?afterColumnInit()? throws ?JRScriptletException? {
????????System.out.println( " **************************************afterColumnInit()************************************** " );
????}

????@Override
???? public ? void ?afterDetailEval()? throws ?JRScriptletException? {
????????System.out.println( " **************************************afterDetailEval()************************************** " );
????}

????@Override
???? public ? void ?afterGroupInit(String?groupName)? throws ?JRScriptletException? {
????????System.out.println( " **************************************afterDetailEval()************************************** " );
????}

????@Override
???? public ? void ?afterPageInit()? throws ?JRScriptletException? {
????????System.out.println( " **************************************afterPageInit()************************************** " );
????}

????@Override
???? public ? void ?afterReportInit()? throws ?JRScriptletException? {
????????System.out.println( " **************************************afterReportInit()?begin************************************** " );
????????
????????String?str? = ?(String)? this .getParameterValue( " ReportTitle " );
????????System.out.println( " report?title=====>>>> " + str);
????????
????????str? += ?str.subSequence( 0 ,?str.length() - 2 );
???????? this .setParameterValue( " ReportTitle " ,?str);
????????System.out.println( " **************************************afterReportInit()?end************************************** " );
????}

????@Override
???? public ? void ?beforeColumnInit()? throws ?JRScriptletException? {
????????System.out.println( " **************************************beforeColumnInit()************************************** " );
????}

????@Override
???? public ? void ?beforeDetailEval()? throws ?JRScriptletException? {
????????System.out.println( " **************************************beforeDetailEval()************************************** " );
????}

????@Override
???? public ? void ?beforeGroupInit(String?groupName)? throws ?JRScriptletException? {
????????System.out.println( " **************************************beforeGroupInit()************************************** " );
????}

????@Override
???? public ? void ?beforePageInit()? throws ?JRScriptletException? {
????????System.out.println( " **************************************beforePageInit()************************************** " );
????}

????@Override
???? public ? void ?beforeReportInit()? throws ?JRScriptletException? {
????????System.out.println( " **************************************beforeReportInit()************************************** " );
????}

???? public ?String?showInfor()? throws ?JRScriptletException? {
???????? return ? " the?is?scriptlet?scriptlet?scriptlet?the,sscriptlet?report?the?is?ascriptlet?report?this?is?a?scriptlet?report?this?is?a?scriptlet?report " ;
????}
????
}

這段代碼最后一個方法是我們自己的加的，用來在報表上顯示一段文本。我們知道對于一個Field、Parameter、Variable，JasperReport分別采用$F{FieldName}、$P{Parametername}、$V{VariableName}來引用，而如果要引用ScriptletReportDemo.java類的showInfor()返回字符串顯示在報表上，看看這個就知道了 iReport+jasperReport之scriptlet

在afterReportInit方法中我們把parameter字段取出來前后添上五個*號再set進去
????下來寫一個test類測試一下：

package ?org.bulktree.ireport.scriptlet;

import ?java.io.File;
import ?java.io.FileInputStream;
import ?java.io.InputStream;
import ?java.util.HashMap;

import ?net.sf.jasperreports.engine.JREmptyDataSource;
import ?net.sf.jasperreports.engine.JasperCompileManager;
import ?net.sf.jasperreports.engine.JasperFillManager;
import ?net.sf.jasperreports.engine.JasperPrint;
import ?net.sf.jasperreports.engine.JasperReport;
import ?net.sf.jasperreports.view.JasperViewer;

/**
?*?
?*? @author ?bulktree?Email:?laoshulin@gmail.com
?*?@Nov?27,?2008
? */
public ? class ?ScriptletTestMain? {

???? public ? static ? void ?main(String[]?args)? {
????????String?path? = ? " D:/workspace/scriptletDemo.jrxml " ;

????????File?file? = ? new ?File(path);
????????InputStream?in;
???????? try ? {

????????????HashMap?parameters? = ? new ?HashMap();
????????????parameters.put( " ReportTitle " ,? " LAOSHULIN " );
????????????in? = ? new ?FileInputStream(file);
????????????JasperReport?jasperReport? = ?JasperCompileManager.compileReport(in);
????????????JasperPrint?jasperPrint? = ?JasperFillManager.fillReport(jasperReport,
????????????????????parameters,? new ?JREmptyDataSource());
????????????JasperViewer?viewer? = ? new ?JasperViewer(jasperPrint);
????????????viewer.setVisible( true );

????????} ? catch ?(Exception?e)? {
???????????? // ?TODO?Auto-generated?catch?block
????????????e.printStackTrace();
????????}

????}
}


效果不錯吧：

iReport+jasperReport之scriptlet

getParameterValue、setParameterValue方法可以操作Parameter,Field/Variable該怎么set呢？
????看看?JRAbstractScriptlet.java類的這個方法：

public ? void ?setData(
????????Map?parsm,
????????Map?fldsm,
????????Map?varsm,
????????JRFillGroup[]?grps
????????)
???? {
????????parametersMap? = ?parsm;
????????fieldsMap? = ?fldsm;
????????variablesMap? = ?varsm;
????????groups? = ?grps;
????}

????????似乎有點意思，我們可以通過這個方法把我們期望的數據組裝成Map然后set進去，可是要只針對個別字段怎么處理呢，調用此方法似乎不太合常理，仔細查看API卻沒有實際能調用的API吧！這個似乎不太合乎，仔細看看確實沒有調用的，至少目前我還是沒有發現，怎么辦 自己寫吧！
????設置Field方法：

public ? void ?setFieldValue(String?fieldName,?Object?value)? throws ?JRScriptletException
???? {
????????JRFillField?field? = ?(JRFillField) this .fieldsMap.get(fieldName);
???????? if ?(field? == ? null )
???????? {
???????????? throw ? new ?JRScriptletException( " FieldName?not?found?:? " ? + ?fieldName);
????????}
????????
????????field.setValue(value);
????}

????設置Variable方法：

public ? void ?setVariableValue(String?variableName,?Object?value)? throws ?JRScriptletException
???? {
????????JRFillVariable?variable? = ?(JRFillVariable) this .variablesMap.get(variableName);
???????? if ?(variable? == ? null )
???????? {
???????????? throw ? new ?JRScriptletException( " Variable?not?found?:? " ? + ?variableName);
????????}
????????
???????? if ?(value? != ? null ? && ? ! variable.getValueClass().isInstance(value)?)
???????? {
???????????? throw ? new ?JRScriptletException( " Incompatible?value?assigned?to?variable? " ? + ?variableName? + ? " .?Expected? " ? + ?variable.getValueClassName()? + ? " . " );
????????}
????????
????????variable.setValue(value);
????}

????OK！這樣我們就可以針對報表上的每一個字段處理了，測試通過 代碼就不貼了哦,寫上篇的時候忘記這兩個方法是我自己加的，查看API時才發現所以來了個續

iReport+jasperReport之scriptlet


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