JasperReport匯出報表

我們已經看到在前面的章節中，如何列印和檢視的JasperReport生成的文件。在這裡，我們將看到如何在其他格式，如PDF，HTML和XLS轉換或匯出這些報告。 Facade類net.sf.jasperreports.engine.JasperExportManager提供實現這一功能。匯出方式轉變JasperPrint物件（.jrprint檔案）匯入到不同的格式。

下面的程式碼（JasperReportExport.java）演示了JasperReport文件的匯出過程。該JasperExportManager提供的方法將報表匯出成PDF，HTML和XML。匯出到使用的類net.sf.jasperreports.engine.export.JRXlsExporter的XLS格式。此程式碼生成以下三個檔案：

• sample_report.pdf

• sample_report.htmll

• sample_report.xls

匯出為其他格式

讓我們來寫一個報表模板。在JRXML檔案的內容 (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>

接著，POJO檔案 C: oolsjasperreports-5.0.1 estsrccomyiibaiDataBean.java 的內容如下：

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;
   }
}

檔案 C: oolsjasperreports-5.0.1 estsrccomyiibaiDataBeanList.java 的內容如下：

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;
   }
}

寫一個主類檔案JasperReportFill.java，它從類（DataBeanList）獲取java bean集合，並將其傳遞到Jasper 報表引擎，填補了報表模板。把它儲存到目錄 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();
      }
   }
}

在這裡，我們已經包括了邏輯Jasper 列印檔案匯出到PDF，HTML和XLS格式。

生成報表

讓我們用我們的常規Ant構建過程編譯和執行上述檔案。 build.xml檔案如下圖所示：

<?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>

進入命令提示字元，然後轉到目錄C: oolsjasperreports-5.0.1 est，其中build.xml已放置。最後執行的命令 ant -Dmain-class=com.yiibai.JasperReportFill. 輸出如下所示：

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

正如上面執行的結果，會發現三個檔案sample_report.pdf，sample_report.htmll，sample_report.xls已生成在 C: 目錄.