在我的项目中，我正在使用 jasper 报告，我编写了代码来通过 JButton“打印客户”启动 jasper 报告，但是有很多错误，错误是
<块引用>错误
net.sf.jasperreports.engine.JRException: Error loading object from file : res\customer.jrxml
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:131)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:103)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:307)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:772)
at view.CustomerReposrt$2.mouseClicked(CustomerReposrt.java:63)
at java.desktop/java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:278)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6617)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
at java.desktop/java.awt.Component.processEvent(Component.java:6379)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4990)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4822)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4919)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4557)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4489)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2769)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4822)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.io.StreamCorruptedException: invalid stream header: 3C3F786D
at java.base/java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:966)
at java.base/java.io.ObjectInputStream.<init>(ObjectInputStream.java:405)
at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.<init>(ContextClassLoaderObjectInputStream.java:58)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:126)
... 35 more
贾斯珀报告代码
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.16.0.final using JasperReports Library version 6.16.0-48579d909b7943b64690c65c71e07e0b80981928 -->
<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="customer" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="dcd25edb-27be-46bd-aea7-8bb63a227644">
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Customer Adapter "/>
<queryString language="SQL">
<![CDATA[select * from customer]]>
</queryString>
<field name="name" class="java.lang.String">
<property name="com.jaspersoft.studio.field.name" value="name"/>
<property name="com.jaspersoft.studio.field.label" value="name"/>
<property name="com.jaspersoft.studio.field.tree.path" value="customer"/>
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<field name="address" class="java.lang.String">
<property name="com.jaspersoft.studio.field.name" value="address"/>
<property name="com.jaspersoft.studio.field.label" value="address"/>
<property name="com.jaspersoft.studio.field.tree.path" value="customer"/>
<fieldDescription><![CDATA[]]></fieldDescription>
</field>
<variable name="name1" class="java.lang.Integer" resetType="Column" calculation="Count">
<variableExpression><![CDATA[$F{name}]]></variableExpression>
</variable>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch">
<staticText>
<reportElement x="216" y="20" width="151" height="41" uuid="c26299f7-0288-4284-83fd-a68b6fd60c33"/>
<textElement>
<font fontName="Andalus" size="20" isBold="true"/>
</textElement>
<text><![CDATA[Customer Test]]></text>
</staticText>
</band>
</title>
<pageHeader>
<band height="35" splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="61" splitType="Stretch">
<staticText>
<reportElement x="220" y="10" width="100" height="30" uuid="0b82e110-dabd-43fe-b43b-9fd52e97b839">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="eab7558a-fdc0-4ae6-9673-8156f36eeed0"/>
</reportElement>
<text><![CDATA[name]]></text>
</staticText>
<staticText>
<reportElement x="438" y="0" width="100" height="30" uuid="e03c8d1e-b9b1-49cd-81a6-76dcefeab68e">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="cedacd22-bfc0-414b-aaf0-5fec63b4b4e2"/>
</reportElement>
<text><![CDATA[address]]></text>
</staticText>
<line>
<reportElement x="-10" y="40" width="585" height="7" uuid="dd22e933-1ea2-4cd7-9730-61daaf0dcad9">
<property name="com.jaspersoft.studio.unit.height" value="px"/>
</reportElement>
</line>
</band>
</columnHeader>
<detail>
<band height="125" splitType="Stretch">
<textField>
<reportElement x="10" y="20" width="100" height="30" uuid="8bd6e1b0-5f10-4b95-990b-0ee685ec2481"/>
<textFieldExpression><![CDATA[$V{name1}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="200" y="30" width="100" height="30" uuid="2c43145d-534c-4a94-af83-627a1a2f52bd">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="eab7558a-fdc0-4ae6-9673-8156f36eeed0"/>
</reportElement>
<textFieldExpression><![CDATA[$F{name}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="438" y="18" width="100" height="30" uuid="3e7b8e0c-ce9c-40c8-b94d-868d34fe4e28">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="cedacd22-bfc0-414b-aaf0-5fec63b4b4e2"/>
</reportElement>
<textFieldExpression><![CDATA[$F{address}]]></textFieldExpression>
</textField>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band height="54" splitType="Stretch"/>
</pageFooter>
<summary>
<band height="42" splitType="Stretch"/>
</summary>
</jasperReport>
JButton 所在的 Java 类
package view;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import org.apache.commons.collections.map.HashedMap;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.view.JasperViewer;
import util.MysqlHelper;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Map;
public class CustomerReposrt extends JFrame {
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
CustomerReposrt frame = new CustomerReposrt();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public CustomerReposrt() {
setTitle("Customer report");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 610, 484);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JButton btnNewButton = new JButton("Print customer");
btnNewButton.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
String report="res\\customer.jrxml";
Map map=new HashedMap();
try {
JasperPrint jp=JasperFillManager.fillReport(report, map,MysqlHelper.openDb());
JasperViewer jv=new JasperViewer(jp,false);
jv.setVisible(true);
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (JRException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
btnNewButton.setFont(new Font("Tahoma", Font.PLAIN, 18));
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnNewButton.setBounds(220, 27, 201, 36);
contentPane.add(btnNewButton);
}
}
这是我的 Dadabase 连接类
package util;
import java.sql.*;
public class MysqlHelper {
private static String driver="com.mysql.jdbc.Driver";
private static String url="jdbc:mysql://localhost/customerdb";
private static java.sql.Connection connection=null;
public static Connection openDb() throws ClassNotFoundException {
try {
Class.forName(driver);
connection=DriverManager.getConnection(url,"root","root");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return connection;
}
public static void closeDb() {
if (connection!=null) {
try {
connection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
发布报告的主要代码
String report="res\\customer.jrxml";
Map map=new HashedMap();
try {
JasperPrint jp=JasperFillManager.fillReport(report, map,MysqlHelper.openDb());
JasperViewer jv=new JasperViewer(jp,false);
jv.setVisible(true);
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (JRException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
我也在github上上传了这个项目，Click here*