前言
上周我们探讨了如何用IReport设计PDF报表，我们了解了IReport报表的设计流程，也学会了如何构建多数据集报表，本周我们来探讨下如何在我们的项目中使用我们设计的报表。
创建项目，编写业务代码
首先我们要先创建web项目，我创建的servlet/jsp项目，具体pom文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>io.github.syske</groupId>
<artifactId>ireport-use-in-web</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>net.sf.jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>5.6.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.16</version>
</dependency>
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itextasian</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
编辑web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>IreportServlet</servlet-name>
<servlet-class>io.github.syske.servlet.IreportServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>IreportServlet</servlet-name>
<url-pattern>/ireport</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
编写数据库连接工具：
package io.github.syske.db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* @program: ireportuseinweb
* @description:
* @author: syske
* @create: 2019-12-28 12:04
*/
public class DBHelper {
private static String driver = "com.mysql.jdbc.Driver"; //数据库驱动
//连接数据库的URL地址
private static final String url = "jdbc:mysql://localhost:3307/test?serverTimezone=Asia/Shanghai";
private static final String usename = "root";
private static final String password = "root"; //数据库密码
private static Connection connection =null;
//静态代码块负责加载驱动
static{//静态块中的代码会优先被执行
try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//单例模式返回数据库连接对象
public static Connection getConnection(){
if(connection==null){
try {
connection = DriverManager.getConnection(url,usename,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return connection;
}
return connection;
}
public static void main(String[] args) {
ResultSet resultSet = null;
try{
Connection connection = DBHelper.getConnection();
Statement statement = connection.createStatement();
resultSet = statement.executeQuery("SELECT * FROM goods;");
while(resultSet.next()){
System.out.println(resultSet.getString("name"));
}
}catch(Exception e){
e.printStackTrace();
}
}
}
编写servlet：
package io.github.syske.servlet;
import io.github.syske.db.DBHelper;
import io.github.syske.util.IReportUtil;
import net.sf.jasperreports.engine.JRException;
import javax.servlet.ServletContext;
import java.io.IOException;
import java.sql.Connection;
import java.util.HashMap;
import java.util.Map;
public class IreportServlet extends javax.servlet.http.HttpServlet {
protected void doPost(javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
}
protected void doGet(javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
Map<String, Object> parameters = new HashMap<String, Object>();
Connection connection = DBHelper.getConnection();
parameters.put("username", request.getParameter("username"));
try {
ServletContext context = request.getSession().getServletContext();
String sourceFileName = context.getRealPath("ireport/"
+ "ireport-demo.jasper");
IReportUtil.exportPdfFileServer(sourceFileName, "D:/test.pdf",parameters, connection);
} catch (JRException e) {
e.printStackTrace();
}
}
}
然后编写我们IReport的工具类：
package io.github.syske.util;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperRunManager;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.util.Map;
import java.util.UUID;
/**
* @program: ireportuseinweb
* @description:
* @author: syske
* @create: 2019-12-28 11:17
*/
public class IReportUtil {
/**
* IReport报表生成pdf
*
* @param reprotfileName 报表文件名称
* @param exportFileName pdf保存完整路径，包含文件名及后缀
* @param parameters 报表入参参数集
* @param connection 数据库连接
* @return
* @throws IOException
* @throws JRException
*/
public static String exportPdfFileServer(
String reprotfileName, String exportFileName,
Map<String, Object> parameters, Connection connection)
throws IOException, JRException {
String sourceFileName = reprotfileName;
// 根据文件创建文件的输出流
JasperRunManager.runReportToPdfFile(sourceFileName, exportFileName,
parameters, connection);
return exportFileName;
}
/**
* IReport报表生成pdfStream
*
* @param reprotfileName 报表文件名称
* @param parameters 报表入参参数集
* @param connection 数据库连接
* @return
* @throws IOException
* @throws JRException
*/
public static FileOutputStream exportPdfFileServer(String reprotfileName,
Map<String, Object> parameters, Connection connection)
throws IOException, JRException {
FileInputStream sourceFileInputStream = new FileInputStream(
reprotfileName);
String exportFileName = UUID.randomUUID().toString() + ".pdf";
FileOutputStream exportFileOutputStream = new FileOutputStream(
exportFileName);
// 根据文件创建文件的输出流
JasperRunManager.runReportToPdfStream(sourceFileInputStream,
exportFileOutputStream, parameters, connection);
return exportFileOutputStream;
}
}
导入报表的编译文件，也就是.jasper结尾的文件，下面是今天演示报表的源文件(.jrxml)：
<?xml version="1.0" encoding="UTF-8"?>
<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="ireport-demo" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="b3d5e4e1-d3f8-446d-952d-724571f940fb">
<property name="ireport.zoom" value="1.2100000000000006"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<subDataset name="test" uuid="3234304e-333d-4afa-87f3-890e416942ad">
<queryString>
<![CDATA[select count(*) count from user]]>
</queryString>
<field name="count" class="java.lang.Long"/>
</subDataset>
<parameter name="username" class="java.lang.String">
<defaultValueExpression><![CDATA[$P{username}]]></defaultValueExpression>
</parameter>
<queryString>
<![CDATA[select username,age,salary from user
where username=$P{username}]]>
</queryString>
<field name="username" class="java.lang.String">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="age" class="java.lang.Integer">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="salary" class="java.lang.Float">
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<variable name="age_sum" class="java.lang.Integer" calculation="Sum">
<variableExpression><![CDATA[$F{age}]]></variableExpression>
</variable>
<variable name="salary_sum" class="java.lang.Double" calculation="Sum">
<variableExpression><![CDATA[$F{salary}]]></variableExpression>
</variable>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch">
<staticText>
<reportElement x="0" y="37" width="555" height="42" uuid="d75420a9-d1af-4f0f-8fec-97ae35f49159"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font fontName="宋体" size="24" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[IReport测试]]></text>
</staticText>
</band>
</title>
<pageHeader>
<band height="35" splitType="Stretch">
<staticText>
<reportElement x="0" y="0" width="555" height="34" uuid="89ebed96-9d55-48e8-b083-199c0686fd6f"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[我是页眉]]></text>
</staticText>
</band>
</pageHeader>
<columnHeader>
<band height="31" splitType="Stretch">
<staticText>
<reportElement x="71" y="0" width="137" height="31" uuid="133aed5c-0d6a-4c06-aa47-e19ca168ecba"/>
<box>
<topPen lineWidth="0.75"/>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[用户名]]></text>
</staticText>
<staticText>
<reportElement x="208" y="0" width="137" height="31" uuid="2f6c838c-0c4e-4f45-86e7-ccf1c850bb0f"/>
<box>
<topPen lineWidth="0.75"/>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[年龄]]></text>
</staticText>
<staticText>
<reportElement x="345" y="0" width="137" height="31" uuid="bc8fa3d4-9683-49e0-8cd0-80eb9a30b5c1"/>
<box>
<topPen lineWidth="0.75"/>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
<rightPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[薪资]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="28" splitType="Stretch">
<textField>
<reportElement x="71" y="0" width="137" height="27" uuid="c7b969ee-07b5-446d-b5b6-3863ecfc0371"/>
<box>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$F{username}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="208" y="0" width="137" height="27" uuid="f2c06cb4-4894-4c9c-b654-11de56e73426"/>
<box>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$F{age}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="345" y="0" width="137" height="27" uuid="07e927e8-f179-4deb-8a7d-b736c68d5f8d"/>
<box>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
<rightPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$F{salary}]]></textFieldExpression>
</textField>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch">
<staticText>
<reportElement x="211" y="15" width="100" height="20" uuid="caf39b65-a514-4caa-a9b7-d62bf84e6a70"/>
<textElement textAlignment="Center">
<font fontName="宋体" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[column footer]]></text>
</staticText>
</band>
</columnFooter>
<pageFooter>
<band height="54" splitType="Stretch">
<componentElement>
<reportElement x="0" y="0" width="555" height="54" uuid="e8c621d6-d885-443c-815e-df7bf7b08e7f"/>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="test" uuid="5dab7dc4-f964-4bec-a700-dc9cd8473d3a">
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
</datasetRun>
<jr:listContents height="54" width="555">
<staticText>
<reportElement x="14" y="14" width="131" height="20" uuid="42ac7b35-c6d9-4159-adf9-86e646c9bd04"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H"/>
</textElement>
<text><![CDATA[多数据集测试-汇总人数：]]></text>
</staticText>
<textField>
<reportElement x="160" y="14" width="100" height="20" uuid="ed58dfe5-904b-4657-aa1a-aa59aef2b05c"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<textFieldExpression><![CDATA[$F{count}]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</pageFooter>
<summary>
<band height="42" splitType="Stretch">
<textField>
<reportElement x="208" y="0" width="137" height="42" uuid="b6171b32-2c50-49e3-98aa-d742d2f68421"/>
<box>
<topPen lineWidth="0.0"/>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$V{age_sum}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="71" y="0" width="137" height="42" uuid="0a7d649d-ef2d-47ed-9b72-657c8955d452"/>
<box>
<topPen lineWidth="0.0"/>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" isBold="true" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<text><![CDATA[汇总]]></text>
</staticText>
<textField pattern="###0.00;-###0.00">
<reportElement x="345" y="0" width="137" height="42" uuid="3859ce87-c7d9-44dc-b35b-341c8c2a4cd2"/>
<box>
<topPen lineWidth="0.0"/>
<leftPen lineWidth="0.75"/>
<bottomPen lineWidth="0.75"/>
<rightPen lineWidth="0.75"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font size="14" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
</textElement>
<textFieldExpression><![CDATA[$V{salary_sum}]]></textFieldExpression>
</textField>
</band>
</summary>
</jasperReport>
编写jsp文件：
<%--
Created by IntelliJ IDEA.
User: syske
Date: 2019-12-28
Time: 12:11
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>IReport Test</title>
</head>
<body>
<form action="/ireport"method="get">
用户名：<input name="username" type="text"><br>
<input type="submit" name="导出">
</form>
</body>
</html>
项目结构如下：
总结
今天的项目总体来说没有什么难度，核心部分就是工具类，但还是有几个问题需要注意：
第一、IReport默认的语言是groovy，xml格式报表文件jasperReport标签有个language属性，默认是groovy（language="groovy"），所以在你发布项目时需要在lib下加入groovy-all-2.0.1.jar，和版本应该关系不大，不然会提示找不到class的错误：
java.lang.NoClassDefFoundError: org/codehaus/groovy/control/CompilationFailedException
java.lang.Class.getDeclaredConstructors0(Native Method)
java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
java.lang.Class.getConstructor0(Class.java:3075)
java.lang.Class.getConstructor(Class.java:1825)
net.sf.jasperreports.engine.JasperCompileManager.getCompiler(JasperCompileManager.java:814)
net.sf.jasperreports.engine.JasperCompileManager.getEvaluator(JasperCompileManager.java:377)
net.sf.jasperreports.engine.fill.JRFillDataset.createCalculator(JRFillDataset.java:462)
net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:405)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:89)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:104)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:62)
net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:179)
net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:81)
net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:457)
net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:418)
net.sf.jasperreports.engine.JasperRunManager.runToPdfStream(JasperRunManager.java:210)
net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:729)
io.github.syske.util.IReportUtil.exportPdfFileServer(IReportUtil.java:65)
io.github.syske.servlet.IreportServlet.doGet(IreportServlet.java:29)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52
还有一种解决方法是将该属性值改为java，但我发下修改保存后，该属性不见了，可能删除掉该属性也可以。以上两种方法都测试过，没有问题。
第二、只要你的报表中有中文或者你有将pdf Font name这个属性改成STSong-Light，那么你就要在lib下加入iTextAsian.jar，而且版本不要太高，太高包名可能发生变化，否则会报如下错误：
net.sf.jasperreports.engine.JRRuntimeException: Could not load the following font :
pdfFontName : STSong-Light
pdfEncoding : UniGB-UCS2-H
isPdfEmbedded : true
net.sf.jasperreports.engine.export.JRPdfExporter.getFont(JRPdfExporter.java:2116)
net.sf.jasperreports.engine.export.JRPdfExporter.getChunk(JRPdfExporter.java:1906)
net.sf.jasperreports.engine.export.JRPdfExporter.getPhrase(JRPdfExporter.java:1875)
net.sf.jasperreports.engine.export.SimplePdfTextRenderer.getPhrase(SimplePdfTextRenderer.java:89)
net.sf.jasperreports.engine.export.SimplePdfTextRenderer.render(SimplePdfTextRenderer.java:99)
net.sf.jasperreports.engine.export.JRPdfExporter.exportText(JRPdfExporter.java:2238)
net.sf.jasperreports.engine.export.JRPdfExporter.exportElements(JRPdfExporter.java:950)
net.sf.jasperreports.engine.export.JRPdfExporter.exportPage(JRPdfExporter.java:909)
net.sf.jasperreports.engine.export.JRPdfExporter.exportReportToStream(JRPdfExporter.java:786)
net.sf.jasperreports.engine.export.JRPdfExporter.exportReport(JRPdfExporter.java:513)
net.sf.jasperreports.engine.JasperExportManager.exportToPdfStream(JasperExportManager.java:198)
net.sf.jasperreports.engine.JasperRunManager.runToPdfStream(JasperRunManager.java:212)
net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:729)
io.github.syske.util.IReportUtil.exportPdfFileServer(IReportUtil.java:65)
io.github.syske.servlet.IreportServlet.doGet(IreportServlet.java:29)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
注：（ 以上项目源码均可在Syske/learning-dome-code（github）找到）[https://github.com/Syske/learning-dome-code]