JasperReports - 导出报告
我们在上一章中了解了如何打印和查看 JasperReport 生成的文档。在这里,我们将了解如何将这些报告转换或导出为其他格式,例如 PDF、HTML 和 XLS。提供外观类 net.sf.jasperreports.engine.JasperExportManager 来实现此功能。导出意味着将 JasperPrint 对象(.jrprint 文件)转换为不同的格式。
以下代码(JasperReportExport.java)演示了 JasperReport 文档的导出过程。JasperExportManager 仅提供将报告导出为 PDF、HTML 和 XML 的方法。要导出为 XLS 格式,我们使用了类 net.sf.jasperreports.engine.export.JRXlsExporter。此代码生成以下三个文件 −
- sample_report.pdf
- sample_report.html
- sample_report.xls
导出为其他格式
我们来编写一个报告模板。JRXML 文件(C:\tools\jasperreports-5.0.1\test\jasper_report_template.jrxml)的内容如下 −
<?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>
接下来,POJO 文件 C:\tools\jasperreports-5.0.1\test\src\com.tutorialspoint\DataBean.java 的内容如下所示 −
package com.tutorialspoint; 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:\tools\jasperreports-5.0.1\test\src\com.tutorialspoint\DataBeanList.java 的内容如下 −
package com.tutorialspoint; 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; } }
编写一个主类文件JasperReportFill.java,从类中获取 java bean 集合(DataBeanList)并将其传递给 JasperReports 引擎,以填充报告模板。将其保存到目录C:\tools\jasperreports-5.0.1\test\src\com.tutorialspoint。
package com.tutorialspoint; 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<DataBean> 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.html"); /** * 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,我们包含了将 Jasper 打印文件导出为 pdf、html 和 xls 格式的逻辑。
生成报告
让我们使用常规 ANT 构建过程编译并执行上述文件。build.xml 文件如下所示 −
<?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,然后进入目录C:\tools\jasperreports-5.0.1\test,build.xml放在这里,最后执行命令ant -Dmain-class=com.tutorialspoint.JasperReportFill,输出结果如下 −
C:\tools\jasperreports-5.0.1\test>ant -Dmain-class=com.tutorialspoint.JasperReportFill Buildfile: C:\tools\jasperreports-5.0.1\test\build.xml clean-sample: [delete] Deleting directory C:\tools\jasperreports-5.0.1\test\classes [delete] Deleting: C:\tools\jasperreports-5.0.1\test\jasper_report_template.jasper [delete] Deleting: C:\tools\jasperreports-5.0.1\test\jasper_report_template.jrprint compile: [mkdir] Created dir: C:\tools\jasperreports-5.0.1\test\classes [javac] C:\tools\jasperreports-5.0.1\test\baseBuild.xml:28: warning: 'includeantruntime' was not set, defaulting t [javac] Compiling 4 source files to C:\tools\jasperreports-5.0.1\test\classes 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.html#noconfig for more info. [jrc] File : C:\tools\jasperreports-5.0.1\test\jasper_report_template.jrxml ... OK. run: [echo] Runnin class : com.tutorialspoint.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
执行完成后,在C:\目录下会生成sample_report.pdf,sample_report.html,sample_report.xls三个文件。