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在servlet中使用jfreereport直接产生pdf文件报表
首先说些废话。
基于java开发的web的应用系统的打印问题一直困扰着我。原因是基于web的应用是瘦客户端应用，逻辑集中在服务器上，而打印是基于客户端的行为。
目前基于web的精确打印解决方案主要有两类：一是加强客户端的逻辑；二是在服务器端产生适于精确打印的文件。
流行的打印工具中用applet实现、用浏览器插件实现或是开发嵌入浏览器的客户端的方法属于第一类；而在服务器端产生图片文件、pdf或ps等
精确打印文件的方法属于第二类。
以上流行的解决方案的比较：
方案 打印效果 浏览器依赖 部署代价 维护代价
applet实现 页面控制困难 需要java plug-in插件 无需客户端部署 客户端调整
浏览器插件实现 同本地打印，效果好 依赖特定类型版本的浏览器 客户端动态部署 客户端调整
图片文件实现 页面控制困难 无 无 无
pdf文件实现 同本地打印，效果好 需要acroreader插件 无需客户端部署 无
pdf文件是流行的文件格式，浏览器和pdf阅读器已成为客户端必备的安装内容。对于通用的打印解决方案我认为pdf文件的方式具有更大的灵活性和可用性。
废话到此为止，下面就给出一个servlet通过模板生成pdf文件的实现：
我选择的是报表工具是jfreereport，当然若简单的文本可以使用itext直接产生。
1. jfreereport与was5.0.x的集成
was5.0.x依据j2ee 1.3规范，jaxp/dom/sax的版本分别为1.1/2/2，与jfreereport依赖的gunjaxp.jar中的一致，其他的包也不存在冲突。因此可以将这些
包直接加到web项目的包目录/web-inf/lib中。
jfreereport的包很多，与读取模板、生成报表和生成pdf文件相关的有：
gnujaxp.jar
itext-1.2.2.jar
itextasian.jar
jcommon-0.9.7.jar
jfreereport-0.8.4_11-core.jar
jfreereport-0.8.4_11-misc-configstore-base.jar
jfreereport-0.8.4_11-output-pageable-base.jar
jfreereport-0.8.4_11-output-pageable-pdf.jar
jfreereport-0.8.4_11-output-support-itext.jar
jfreereport-0.8.4_11-output-support-pagelayout.jar
jfreereport-0.8.4_11-parser-base.jar
jfreereport-0.8.4_11-parser-ext.jar
pixie-0.8.1.jar
jfreereport中自带的itext-1.02b.jar版本低，可以替换为新版本，itextasian.jar是生成中文所必须的。
2. 编码和汉字问题
由于我的环境是英文系统(win2k en version + sp4)加装中文支持，为了在开发环境中支持中文必须使用utf-8编码。因此需要对jfreereport中的一些参数进行配置。
需要将org\jfree\report\modules\output\support\itext\configuration.properties文件中的org.jfree.report.modules.output.support.itext.encoding参数设为gbk (或gb18030，请量力而行，我的环境未安装gb18030的支持)。
需要将显示中文的区域的字体和编码分别设为"stsong-light"和"unigb-ucs2-h"。此字体和编码是生成pdf文件时显示中文所必须的，与jfreereport的gui工具的显示无关。
3. 程序示例
我选用了jfreereport中的java look and feel graphics repository的例子，并将部分内容换为中文。以下是直接生成pdf的servlet代码和我变更的报表模板。
//- genpdfbyjfreereporttemplateservlet.java
package acme.web.servlets;
import java.io.ioexception;
import java.net.url;
import javax.servlet.servlet;
import javax.servlet.servletexception;
import javax.servlet.servletoutputstream;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.jfree.report.boot;
import org.jfree.report.jfreereport;
import org.jfree.report.demo.swingiconsdemotablemodel;
import org.jfree.report.modules.output.pageable.base.pageablereportprocessor;
import org.jfree.report.modules.output.pageable.pdf.pdfoutputtarget;
import org.jfree.report.modules.parser.base.reportgenerator;
import org.jfree.report.util.log;
import org.jfree.report.util.reportconfiguration;
import org.jfree.xml.elementdefinitionexception;
/**
* @version 1.0
* @author lee s
*/
public class genpdfbyjfreereporttemplateservlet extends httpservlet implements servlet
{
/**
* @see javax.servlet.http.httpservlet#void (javax.servlet.http.httpservletrequest, javax.servlet.http.httpservletresponse)
*/
public void doget(httpservletrequest req, httpservletresponse resp)
throws servletexception, ioexception
{
resp.setcontenttype("application/pdf");
servletoutputstream out = resp.getoutputstream();
try
{
// initialize jfreereport
boot.start();
reportconfiguration.getglobalconfig().setloglevel("error");
// update the log system to use the new settings ...
log.getjfreereportlog().init();
final url in =
getclass().getresource("/acme/web/resources/swing-icons.xml");
if (in == null)
{
throw new exception("swing-icons.xml can't be found.");
}
final jfreereport report = parsereport(in);
report.setdata(new swingiconsdemotablemodel());
pdfoutputtarget target =
new pdfoutputtarget(out, report.getdefaultpageformat());
target.configure(report.getreportconfiguration());
target.open();
pageablereportprocessor proc = new pageablereportprocessor(report);
proc.setoutputtarget(target);
proc.processreport();
target.close();
}
catch (exception ex)
{
system.err.println("generate pdf failed: " + ex);
}
finally
{
try
{
out.close();
}
catch (exception e)
{
system.err.println("output pdf failed: " + e);
}
}
}
/**
* @see javax.servlet.http.httpservlet#void (javax.servlet.http.httpservletrequest, javax.servlet.http.httpservletresponse)
*/
public void dopost(httpservletrequest req, httpservletresponse resp)
throws servletexception, ioexception
{
doget(req, resp);
}
/**
* reads the report from the swing-icons.xml report template.
*
* @param templateurl the template location.
*
* @return a report.
* @throws elementdefinitionexception if the report generator encountered an error.
* @throws ioexception if there was an io error while reading from the url.
*/
private jfreereport parsereport(final url templateurl)
throws ioexception, elementdefinitionexception
{
final reportgenerator generator = reportgenerator.getinstance();
return generator.parsereport(templateurl);
}
}
//-
swing-icons.
xml
<?xml version="1.0" encoding="utf-8"?>
<!doctype report-definition
public "-//jfreereport//dtd report definition//en//extended"
"http://jfreereport.sourceforge.net/extreport.dtd">
<!-- ***************************************************************** -->
<!-- * swing-icons.xml * -->
<!-- * a sample report definition used as an introduction to * -->
<!-- * jfreereport. * -->
<!-- ***************************************************************** -->
<report-definition name="first report">
<!-- ************************ -->
<!-- * parser configuration * -->
<!-- ************************ -->
<parser-config>
<object-factory class="org.jfree.report.modules.parser.ext.factory.objects.defaultclassfactory"/>
<element-factory class="org.jfree.report.modules.parser.ext.factory.elements.defaultelementfactory"/>
<stylekey-factory class="org.jfree.report.modules.parser.ext.factory.stylekey.defaultstylekeyfactory"/>
<stylekey-factory class="org.jfree.report.modules.parser.ext.factory.stylekey.pageablelayoutstylekeyfactory"/>
<template-factory class="org.jfree.report.modules.parser.ext.factory.templates.defaulttemplatecollection"/>
<datasource-factory class="org.jfree.report.modules.parser.ext.factory.datasource.defaultdatasourcefactory"/>
</parser-config>
<!-- ************************ -->
<!-- * report configuration * -->
<!-- ************************ -->
<report-config>
<defaultpageformat orientation="portrait"
pageformat="letter"
topmargin="72"
bottommargin="72"
leftmargin="72"
rightmargin="72"/>
</report-config>
<!-- ********** -->
<!-- * styles * -->
<!-- ********** -->
<styles>
<style name="medium-line">
<compound-key name="min-size">
<basic-object name="height">0.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
<basic-key name="paint">black</basic-key>
<basic-key name="stroke" class="java.awt.basicstroke">0.5</basic-key>
<basic-key name="draw-shape">true</basic-key>
<basic-key name="scale">true</basic-key>
</style>
<style name="background-rectangle">
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">0.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">-100.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
<basic-key name="fill-shape">true</basic-key>
<basic-key name="scale">true</basic-key>
</style>
</styles>
<!-- ********************** -->
<!-- * report description * -->
<!-- ********************** -->
<report-description>
<!-- ================= -->
<!-- = report header = -->
<!-- ================= -->
<report-header name="report-header-band">
<style>
<compound-key name="min-size">
<basic-object name="height">112.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
</style>
<default-style>
<basic-key name="font">sansserif</basic-key>
<basic-key name="font-size">10</basic-key>
<basic-key name="valignment">bottom</basic-key>
</default-style>
<element name="title1" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">2.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">18.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
<basic-key name="alignment">center</basic-key>
<basic-key name="font-size">18</basic-key>
<basic-key name="font-bold">true</basic-key>
</style>
<template references="label">
<basic-object name="content">java look and feel graphics repository</basic-object>
</template>
</element>
<element name="description1" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">32.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">10.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">this report lists the icons contained in the java look and feel graphics repository.</basic-object>
</template>
</element>
<element name="description2" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">44.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">10.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">for more information about the repository, refer to:</basic-object>
</template>
</element>
<element name="url1" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">68.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">10.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
<basic-key name="alignment">center</basic-key>
<basic-key name="font">monospaced</basic-key>
<basic-key name="font-size">9</basic-key>
</style>
<template references="label">
<basic-object name="content">http://developer.java.sun.com/developer/techdocs/hi/repository/</basic-object>
</template>
</element>
<element name="description3" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">92.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">10.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">the design of this report is described in the jfreereport pdf documentation.</basic-object>
</template>
</element>
</report-header>
<!-- ================= -->
<!-- = report footer = -->
<!-- ================= -->
<report-footer name="report-footer-band">
<style>
<compound-key name="min-size">
<basic-object name="height">30.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
</style>
<default-style>
<basic-key name="font">sansserif</basic-key>
<basic-key name="font-size">12</basic-key>
<basic-key name="font-bold">true</basic-key>
<basic-key name="valignment">bottom</basic-key>
</default-style>
<element name="rect1" type="shape/generic">
<style>
<extends name="background-rectangle"/>
<basic-key name="paint">#ccffcc</basic-key>
</style>
<template references="rectangle"/>
</element>
<element type="shape/generic">
<style>
<extends name="medium-line"/>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">0.0</basic-object>
</compound-key>
</style>
<template references="horizontal-line"/>
</element>
<element type="shape/generic">
<style>
<extends name="medium-line"/>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">30.0</basic-object>
</compound-key>
</style>
<template references="horizontal-line"/>
</element>
<element name="reporttotallabel" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">10.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">12.0</basic-object>
<basic-object name="width">-50.0</basic-object>
</compound-key>
<basic-key name="alignment">left</basic-key>
</style>
<template references="label">
<basic-object name="content">report total:</basic-object>
</template>
</element>
<element name="reportcountfield" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-50.0</basic-object>
<basic-object name="y">10.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-30.0</basic-object>
</compound-key>
<basic-key name="alignment">center</basic-key>
<basic-key name="font-size">9</basic-key>
</style>
<template references="number-field">
<basic-object name="field">overallcount</basic-object>
<basic-object name="format">#0</basic-object>
<basic-object name="nullvalue">-</basic-object>
</template>
</element>
<element name="reportsumfield" type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-80.0</basic-object>
<basic-object name="y">10.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-20.0</basic-object>
</compound-key>
<basic-key name="font-size">9</basic-key>
<basic-key name="alignment">right</basic-key>
<basic-key name="valignment">bottom</basic-key>
</style>
<template references="number-field">
<basic-object name="field">overallsum</basic-object>
<basic-object name="format">#,##0</basic-object>
<basic-object name="nullvalue">-</basic-object>
</template>
</element>
</report-footer>
<!-- =============== -->
<!-- = page header = -->
<!-- =============== -->
<page-header>
<style>
<compound-key name="min-size">
<basic-object name="height">18.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
<basic-key name="display-on-firstpage">false</basic-key>
<basic-key name="display-on-lastpage">true</basic-key>
</style>
<default-style>
<basic-key name="font-bold">true</basic-key>
<basic-key name="font-size">9</basic-key>
<basic-key name="font">sansserif</basic-key>
<basic-key name="font-italic">false</basic-key>
<basic-key name="paint">black</basic-key>
<basic-key name="valignment">bottom</basic-key>
</default-style>
<element type="shape/generic">
<style>
<extends name="background-rectangle"/>
<basic-key name="paint">#afafaf</basic-key>
</style>
<template references="rectangle"/>
</element>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">0.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">14.0</basic-object>
<basic-object name="width">-50.0</basic-object>
</compound-key>
<basic-key name="alignment">left</basic-key>
</style>
<template references="label">
<basic-object name="content">java look and feel graphics repository</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-80.0</basic-object>
<basic-object name="y">0.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">14.0</basic-object>
<basic-object name="width">-20.0</basic-object>
</compound-key>
<basic-key name="alignment">right</basic-key>
</style>
<template references="date-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="format">d-mmm-yyyy</basic-object>
<basic-object name="field">report.date</basic-object>
</template>
</element>
<element type="shape/generic">
<style>
<extends name="medium-line"/>
<basic-key name="stroke" class="java.awt.basicstroke">2.0</basic-key>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">16.0</basic-object>
</compound-key>
<basic-key name="paint">#cfcfcf</basic-key>
</style>
<template references="horizontal-line"/>
</element>
</page-header>
<!-- =============== -->
<!-- = page footer = -->
<!-- =============== -->
<page-footer>
<style>
<basic-key name="display-on-lastpage">true</basic-key>
<basic-key name="display-on-firstpage">true</basic-key>
<compound-key name="min-size">
<basic-object name="height">14.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
</style>
<default-style>
<basic-key name="font-bold">false</basic-key>
<basic-key name="font-size">9</basic-key>
<basic-key name="font">sansserif</basic-key>
<basic-key name="font-italic">false</basic-key>
</default-style>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">3.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-100.0</basic-object>
</compound-key>
<basic-key name="alignment">center</basic-key>
<basic-key name="valignment">bottom</basic-key>
</style>
<template references="number-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="format">page #0</basic-object>
<basic-object name="field">pagenumber</basic-object>
</template>
</element>
</page-footer>
<!-- ========== -->
<!-- = groups = -->
<!-- ========== -->
<groups>
<!-- category group -->
<group name="category">
<fields>
<field>category</field>
</fields>
<group-header>
<style>
<compound-key name="min-size">
<basic-object name="height">30.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
</style>
<default-style>
<!-- use such font name & encoding for displaying chinese -->
<basic-key name="font">stsong-light</basic-key>
<basic-key name="font-encoding">unigb-ucs2-h</basic-key>
<basic-key name="font-size">12</basic-key>
<basic-key name="font-bold">true</basic-key>
<basic-key name="font-italic">false</basic-key>
<basic-key name="paint">black</basic-key>
<basic-key name="alignment">left</basic-key>
<basic-key name="valignment">bottom</basic-key>
</default-style>
<element type="shape/generic">
<style>
<extends name="background-rectangle"/>
<basic-key name="paint">#ccccff</basic-key>
</style>
<template references="rectangle"/>
</element>
<element type="shape/generic">
<style>
<extends name="medium-line"/>
<basic-key name="paint">black</basic-key>
</style>
<template references="horizontal-line"/>
</element>
<element type="shape/generic">
<style>
<extends name="medium-line"/>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">30.0</basic-object>
</compound-key>
<basic-key name="paint">black</basic-key>
</style>
<template references="horizontal-line"/>
</element>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">3.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">12.0</basic-object>
<basic-object name="width">92.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">分类:</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">96.0</basic-object>
<basic-object name="y">3.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">12.0</basic-object>
<basic-object name="width">120.0</basic-object>
</compound-key>
</style>
<template references="string-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="field">category</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<basic-key name="font-size">8</basic-key>
<basic-key name="font-bold">false</basic-key>
<basic-key name="font-italic">true</basic-key>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">20.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-50.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">名称:</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<basic-key name="font-size">8</basic-key>
<basic-key name="font-bold">false</basic-key>
<basic-key name="font-italic">true</basic-key>
<basic-key name="paint">black</basic-key>
<compound-key name="absolute_pos">
<basic-object name="x">-50.0</basic-object>
<basic-object name="y">20.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-30.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">图标:</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<basic-key name="font-size">8</basic-key>
<basic-key name="font-bold">false</basic-key>
<basic-key name="font-italic">true</basic-key>
<basic-key name="alignment">right</basic-key>
<compound-key name="absolute_pos">
<basic-object name="x">-80.0</basic-object>
<basic-object name="y">20.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-20.0</basic-object>
</compound-key>
</style>
<template references="label">
<basic-object name="content">文件大小:</basic-object>
</template>
</element>
</group-header>
<group-footer>
<style>
<compound-key name="min-size">
<basic-object name="height">30.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
<basic-key name="pagebreak-before">false</basic-key>
</style>
<default-style>
<basic-key name="font">sansserif</basic-key>
<basic-key name="font-size">11</basic-key>
<basic-key name="font-bold">true</basic-key>
<basic-key name="font-italic">false</basic-key>
<basic-key name="valignment">bottom</basic-key>
</default-style>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">5.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">11.0</basic-object>
<basic-object name="width">100.0</basic-object>
</compound-key>
<basic-key name="alignment">left</basic-key>
</style>
<template references="label">
<basic-object name="content">group total:</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-50.0</basic-object>
<basic-object name="y">5.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-30.0</basic-object>
</compound-key>
<basic-key name="alignment">center</basic-key>
<basic-key name="font-size">9</basic-key>
</style>
<template references="number-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="format">#0</basic-object>
<basic-object name="field">groupcount</basic-object>
</template>
</element>
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-80.0</basic-object>
<basic-object name="y">5.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">9.0</basic-object>
<basic-object name="width">-20.0</basic-object>
</compound-key>
<basic-key name="font-size">9</basic-key>
<basic-key name="alignment">right</basic-key>
</style>
<template references="number-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="format">#,##0</basic-object>
<basic-object name="field">groupsum</basic-object>
</template>
</element>
</group-footer>
</group>
</groups>
<!-- ============= -->
<!-- = item band = -->
<!-- ============= -->
<itemband>
<style>
<compound-key name="min-size">
<basic-object name="height">26.0</basic-object>
<basic-object name="width">0.0</basic-object>
</compound-key>
</style>
<default-style>
<basic-key name="font">stsong-light</basic-key>
<basic-key name="font-encoding">unigb-ucs2-h</basic-key>
<basic-key name="font-size">10</basic-key>
<basic-key name="valignment">bottom</basic-key>
</default-style>
<element type="shape/generic">
<style>
<extends name="medium-line"/>
<basic-key name="stroke" class="java.awt.basicstroke">0.1</basic-key>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">25.0</basic-object>
</compound-key>
<basic-key name="paint">#dfdfdf</basic-key>
</style>
<template references="horizontal-line"/>
</element>
<!-- element to display the name from the tablemodel -->
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">0.0</basic-object>
<basic-object name="y">8.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">10.0</basic-object>
<basic-object name="width">-50.0</basic-object>
</compound-key>
<basic-key name="alignment">left</basic-key>
</style>
<template references="string-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="field">name</basic-object>
</template>
</element>
<!-- element to display icon from the tablemodel -->
<element type="image/generic">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-50.0</basic-object>
<basic-object name="y">1.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">24.0</basic-object>
<basic-object name="width">-30.0</basic-object>
</compound-key>
<basic-key name="alignment">center</basic-key>
<basic-key name="valignment">middle</basic-key>
</style>
<template references="image-field">
<basic-object name="field">icon</basic-object>
</template>
</element>
<!-- element to display the file size from the tablemodel -->
<element type="text/plain">
<style>
<compound-key name="absolute_pos">
<basic-object name="x">-80.0</basic-object>
<basic-object name="y">8.0</basic-object>
</compound-key>
<compound-key name="min-size">
<basic-object name="height">10.0</basic-object>
<basic-object name="width">-20.0</basic-object>
</compound-key>
<basic-key name="alignment">right</basic-key>
</style>
<template references="number-field">
<basic-object name="nullvalue">-</basic-object>
<basic-object name="format">#,##0</basic-object>
<basic-object name="field">size</basic-object>
</template>
</element>
</itemband>
</report-description>
<!-- ************* -->
<!-- * functions * -->
<!-- ************* -->
<functions>
<property-ref name="report.date"/>
<function name="pagenumber" class="org.jfree.report.function.pagefunction"/>
<function name="groupcount" class="org.jfree.report.function.itemcountfunction">
<properties>
<property name="field">name</property>
<property name="group">category</property>
</properties>
</function>
<function name="groupsum" class="org.jfree.report.function.itemsumfunction">
<properties>
<property name="field">size</property>
<property name="group">category</property>
</properties>
</function>
<function name="overallcount" class="org.jfree.report.function.itemcountfunction">
<properties>
<property name="field">name</property>
</properties>
</function>
<function name="overallsum" class="org.jfree.report.function.itemsumfunction">
<properties>
<property name="field">size</property>
</properties>
</function>
</functions>
</report-definition>
4. 总结这是自认为目前最佳的
web应用的打印解决方案，虽然仅使用jfreereport产生pdf文件的功能，但是jfreereport提供的页面自动布置的功能使产生报表的工作较之使用itext直接产生要方便许多。以上的例子理论上可以在任何的符合
j2ee 1.3规范(或部分符合，如
tomcat 4.x)的
应用服务器上运行，我仅仅在was 5.0.x上进行了
测试。仅供大家参考。
参考 jfreereport 0.8.3 reference
guide - http://www.object-refinery.com/ jfreereport/jfreereport-0.8.3-a4.pdf
用
java实现pdf报表 - http://blog.csdn
.net/legendinfo/articles/176184.
aspx
