JasperReport导出报表

我们已经看到在前面的章节中，如何打印和查看的JasperReport生成的文档。在这里，我们将看到如何在其他格式，如PDF，HTML和XLS转换或导出这些报告。 Facade类net.sf.jasperreports.engine.JasperExportManager提供实现这一功能。导出方式转变JasperPrint对象（.jrprint文件）导入到不同的格式。

下面的代码（JasperReportExport.java）演示了JasperReport文档的导出过程。该JasperExportManager提供的方法将报表导出成PDF，HTML和XML。导出到使用的类net.sf.jasperreports.engine.export.JRXlsExporter的XLS格式。此代码生成以下三个文件：

• sample_report.pdf

• sample_report.htmll

• sample_report.xls

导出为其他格式

让我们来写一个报表模板。在JRXML文件的内容 (C: oolsjasperreports-5.0.1 estjasper_report_template.jrxml) 如下:

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN"
"http://jasperreports.sourceforge.net/dtds/jasperreport.dtd"> <jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports
http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="jasper_report_template" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20"> <queryString> <![CDATA[]]> </queryString> <field name="country" class="java.lang.String"> <fieldDescription><![CDATA[country]]></fieldDescription> </field> <field name="name" class="java.lang.String"> <fieldDescription><![CDATA[name]]></fieldDescription> </field> <columnHeader> <band height="23"> <staticText> <reportElement mode="Opaque" x="0" y="3" width="535" height="15" backcolor="#70A9A9" /> <box> <bottomPen lineWidth="1.0" lineColor="#CCCCCC" /> </box> <textElement /> <text><![CDATA[]]> </text> </staticText> <staticText> <reportElement x="414" y="3" width="121" height="15" /> <textElement textAlignment="Center" verticalAlignment="Middle"> <font isBold="true" /> </textElement> <text><![CDATA[Country]]></text> </staticText> <staticText> <reportElement x="0" y="3" width="136" height="15" /> <textElement textAlignment="Center" verticalAlignment="Middle"> <font isBold="true" /> </textElement> <text><![CDATA[Name]]></text> </staticText> </band> </columnHeader> <detail> <band height="16"> <staticText> <reportElement mode="Opaque" x="0" y="0" width="535" height="14" backcolor="#E5ECF9" /> <box> <bottomPen lineWidth="0.25" lineColor="#CCCCCC" /> </box> <textElement /> <text><![CDATA[]]> </text> </staticText> <textField> <reportElement x="414" y="0" width="121" height="15" /> <textElement textAlignment="Center" verticalAlignment="Middle"> <font size="9" /> </textElement> <textFieldExpression class="java.lang.String"> <![CDATA[$F{country}]]> </textFieldExpression> </textField> <textField> <reportElement x="0" y="0" width="136" height="15" /> <textElement textAlignment="Center" verticalAlignment="Middle" /> <textFieldExpression class="java.lang.String"> <![CDATA[$F{name}]]> </textFieldExpression> </textField> </band> </detail> </jasperReport>

接着，POJO文件 C: oolsjasperreports-5.0.1 estsrccomyiibaiDataBean.java 的内容如下：

package com.yiibai; public class DataBean { private String name; private String country; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getCountry() { return country; } public void setCountry(String country) { this.country = country; } }

文件 C: oolsjasperreports-5.0.1 estsrccomyiibaiDataBeanList.java 的内容如下：

package com.yiibai; import java.util.ArrayList; public class DataBeanList { public ArrayList<DataBean> getDataBeanList() { ArrayList<DataBean> dataBeanList = new ArrayList<DataBean>(); dataBeanList.add(produce("Manisha", "India")); dataBeanList.add(produce("Dennis Ritchie", "USA")); dataBeanList.add(produce("V.Anand", "India")); dataBeanList.add(produce("Shrinath", "California")); return dataBeanList; } /**
    * This method returns a DataBean object,
    * with name and country set in it.
    */ private DataBean produce(String name, String country) { DataBean dataBean = new DataBean(); dataBean.setName(name); dataBean.setCountry(country); return dataBean; } }

写一个主类文件JasperReportFill.java，它从类（DataBeanList）获取java bean集合，并将其传递到Jasper 报表引擎，填补了报表模板。把它保存到目录 C: oolsjasperreports-5.0.1 estsrccomyiibai.

package com.yiibai; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; import net.sf.jasperreports.engine.JRException; import net.sf.jasperreports.engine.JRExporterParameter; import net.sf.jasperreports.engine.JasperExportManager; import net.sf.jasperreports.engine.JasperFillManager; import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource; import net.sf.jasperreports.engine.export.JRXlsExporter; public class JasperReportFill { @SuppressWarnings("unchecked") public static void main(String[] args) { String sourceFileName = "c://tools/jasperreports-5.0.1/" + "test/jasper_report_template.jasper"; String printFileName = null; DataBeanList DataBeanList = new DataBeanList(); ArrayList dataList = DataBeanList.getDataBeanList(); JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(dataList); Map parameters = new HashMap(); try { printFileName = JasperFillManager.fillReportToFile(sourceFileName, parameters, beanColDataSource); if (printFileName != null) { /**
             * 1- export to PDF
             */ JasperExportManager.exportReportToPdfFile(printFileName, "C://sample_report.pdf"); /**
             * 2- export to HTML
             */ JasperExportManager.exportReportToHtmlFile(printFileName, "C://sample_report.htmll"); /**
             * 3- export to Excel sheet
             */ JRXlsExporter exporter = new JRXlsExporter(); exporter.setParameter(JRExporterParameter.INPUT_FILE_NAME, printFileName); exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, "C://sample_report.xls"); exporter.exportReport(); } } catch (JRException e) { e.printStackTrace(); } } }

在这里，我们已经包括了逻辑Jasper 打印文件导出到PDF，HTML和XLS格式。

生成报表

让我们用我们的常规Ant构建过程编译和执行上述文件。 build.xml文件如下图所示：

<?xml version="1.0" encoding="UTF-8"?> <project name="JasperReportTest" default="executereport" basedir="."> <import file="baseBuild.xml"/> <target name="executereport" depends="compile,compilereportdesing,run"> <echo message="Im here"/> </target> <target name="compilereportdesing" description="Compiles the JXML file and
         produces the .jasper file."> <taskdef name="jrc" classname="net.sf.jasperreports.ant.JRAntCompileTask"> <classpath refid="classpath" /> </taskdef> <jrc destdir="."> <src> <fileset dir="."> <include name="*.jrxml" /> </fileset> </src> <classpath refid="classpath" /> </jrc> </target> </project>

进入命令提示符，然后转到目录C: oolsjasperreports-5.0.1 est，其中build.xml已放置。最后执行的命令 ant -Dmain-class=com.yiibai.JasperReportFill. 输出如下所示：

C:	oolsjasperreports-5.0.1	est>ant -Dmain-class=com.yiibai.JasperReportFill
Buildfile: C:	oolsjasperreports-5.0.1	estuild.xml

clean-sample:
   [delete] Deleting directory C:	oolsjasperreports-5.0.1	estclasses
   [delete] Deleting: C:	oolsjasperreports-5.0.1	estjasper_report_template.jasper
   [delete] Deleting: C:	oolsjasperreports-5.0.1	estjasper_report_template.jrprint

compile:
    [mkdir] Created dir: C:	oolsjasperreports-5.0.1	estclasses
    [javac] C:	oolsjasperreports-5.0.1	estaseBuild.xml:28:
    warning: 'includeantruntime' was not set, defaulting t
    [javac] Compiling 4 source files to C:	oolsjasperreports-5.0.1	estclasses

compilereportdesing:
      [jrc] Compiling 1 report design files.
      [jrc] log4j:WARN No appenders could be found for logger
      (net.sf.jasperreports.engine.xml.JRXmlDigesterFactory).
      [jrc] log4j:WARN Please initialize the log4j system properly.
      [jrc] log4j:WARN See http://logging.apache.org/log4j/1.2/faq.htmll#noconfig for more info.
      [jrc] File : C:	oolsjasperreports-5.0.1	estjasper_report_template.jrxml ... OK.

run:
     [echo] Runnin class : com.yiibai.JasperReportFill
     [java] log4j:WARN No appenders could be found for logger
     (net.sf.jasperreports.extensions.ExtensionsEnvironment).
     [java] log4j:WARN Please initialize the log4j system properly.

executereport:
     [echo] Im here

BUILD SUCCESSFUL
Total time: 32 seconds

正如上面执行的结果，会发现三个文件sample_report.pdf，sample_report.htmll，sample_report.xls已生成在 C: 目录.