转载：https://blog.csdn.net/shiyun123zw/article/details/79180123

在实际项目中，一般使用java对象作为数据源的方式更多，这种方式会更加灵活多变。对于mvc结构更为契合。上面介绍了用JDBC数据源时，用到了Fields对象。本篇主要是使用Fileds对象来匹配JavaBean对象。

5.1 在项目中新建user对象（添加get,set方法），结构如下：

5.2 新建报表模板DemoReport4.jrxml

5.2.1按照user对象新建Fileds（注意数据类型一致）

5.2.2 去掉多余的band,只保留Title,Detail,PageFooter。去掉band的前后距，步骤：模板（DemoReport4）右键 -> Show Propertes -> Page Format -> Edit Page Format

5.2.3 将Filed拖动到 Detail 1 Band。并设计模板，保持Filed的高与Detail Band的高一致

设置页码，打开组件面板 在Composite Elements栏找到Page Number 拖入到 Page Footer 中

保存,并将jrxml文件放入到项目webroot下新建的jrxml目录中。

5.3 编写servlet注入JavaBean数据源。新建JasperServlet3

5.3.1 JasperServlet3的doget如下：

此处代码略；往下看；

5.3.2 启动tomcat并访问

Maven结构代码如下：

User.java

package com.accord.demo;

public class User {
	private String name;
	
	public User() {
		super();
	}

	public User(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}

JasperServletJavaBean.java

package com.accord.servlet;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.accord.demo.User;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperRunManager;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;

public class JasperServletJavaBean extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public JasperServletJavaBean() {
        super();
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	doPost(request, response);
	}

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	ServletContext context = this.getServletConfig().getServletContext(); 	
		try {
			//JasperCompileManager.compileReportToFile("E:/report/DbReport.jrxml");
			JasperCompileManager.compileReportToFile(context.getRealPath("/jasper/DemoReport04.jrxml"));
		} catch (JRException e1) {
			e1.printStackTrace();
		}//编译jrxml文件，生成jasper文件

		File reportFile = new File(context.getRealPath("/jasper/DemoReport04.jasper"));
		if (!reportFile.exists())
			throw new JRRuntimeException("FileWebappReport.jasper "
					+ "not found. The report design must be compiledfirst.");
		String jasperPath = context.getRealPath("/jasper/DemoReport04.jasper");
		
		FileInputStream isRef = null;
		ServletOutputStream sosRef = null;
		try {
			isRef = new FileInputStream(reportFile);
			sosRef = response.getOutputStream();
			//组装list数据源
			List<User> list = new ArrayList<User>();
			for (int i = 1;i<=100;i++) {
				User user = new User();
				user.setName("小明" + i);
				list.add(user);
			}
 			//javabean为数据源注入报表数据
			JasperRunManager.runReportToPdfStream(isRef, sosRef, null,new JRBeanCollectionDataSource(list));
			response.setContentType("application/pdf");
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			sosRef.flush();
			sosRef.close();
		}
	}
}

DemoReport04.jrxml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0  -->
<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="DemoReport04" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="a4cc8842-e711-43ea-bab5-c3fb8a0707c1">
	<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
	<property name="com.jaspersoft.studio.data.defaultdataadapter" value="msql"/>
	<queryString language="SQL">
		<![CDATA[select * from company]]>
	</queryString>
	<field name="name" class="java.lang.String">
		<property name="com.jaspersoft.studio.field.label" value="name"/>
		<property name="com.jaspersoft.studio.field.tree.path" value="company"/>
	</field>
	<background>
		<band splitType="Stretch"/>
	</background>
	<title>
		<band height="54" splitType="Stretch">
			<staticText>
				<reportElement x="216" y="12" width="122" height="30" uuid="2af80fa7-f0d5-4b35-a084-bf1818a9296e"/>
				<textElement>
				   <font fontName="宋体" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
				</textElement>
				<text><![CDATA[名称明细表]]></text>
			</staticText>
		</band>
	</title>
	<detail>
		<band height="84" splitType="Stretch">
			<textField>
				<reportElement x="240" y="64" width="100" height="20" uuid="d8be8542-ab13-4c4e-bdca-ad95a363ddc5"/>
				<textElement>
				   <font fontName="宋体" pdfFontName="STSong-Light" pdfEncoding="UniGB-UCS2-H" isPdfEmbedded="true"/>
				</textElement>
				<textFieldExpression><![CDATA[$F{name}]]></textFieldExpression>
			</textField>
		</band>
	</detail>
	<pageFooter>
		<band height="54" splitType="Stretch">
			<textField>
				<reportElement x="441" y="23" width="100" height="30" uuid="5eeb73dc-d3e6-452d-87b9-6ee4fb03021c"/>
				<textFieldExpression><![CDATA[$V{PAGE_NUMBER}]]></textFieldExpression>
			</textField>
		</band>
	</pageFooter>
</jasperReport>

pom.xml

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>JasperReports</groupId>
  <artifactId>JasperReports02</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>JasperReports02 Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </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>5.1.30</version>
	</dependency>
	
	<!-- 解决中文乱码 -->
	<dependency> 
	    <groupId>com.lowagie</groupId>
	    <artifactId>itextasian</artifactId>
	    <version>1.5.2</version>
	</dependency>
	
	<dependency>
	    <groupId>javax.servlet</groupId>
	    <artifactId>servlet-api</artifactId>
	    <version>2.5</version>
	</dependency>
    
  </dependencies>
  <build>
    <finalName>JasperReports02</finalName>
  </build>
</project>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
  	<servlet-name>JasperServlet</servlet-name>
  	<display-name>JasperServlet</display-name>
  	<description></description>
  	<servlet-class>com.accord.servlet.JasperServlet</servlet-class>
  </servlet>
  <servlet>
  	<servlet-name>JasperServletDb</servlet-name>
  	<display-name>JasperServletDb</display-name>
  	<description></description>
  	<servlet-class>com.accord.servlet.JasperServletDb</servlet-class>
  </servlet>
  <servlet>
  	<servlet-name>JasperServletJavaBean</servlet-name>
  	<display-name>JasperServletJavaBean</display-name>
  	<description></description>
  	<servlet-class>com.accord.servlet.JasperServletJavaBean</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>JasperServlet</servlet-name>
  	<url-pattern>/JasperServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
  	<servlet-name>JasperServletDb</servlet-name>
  	<url-pattern>/JasperServletDb</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
  	<servlet-name>JasperServletJavaBean</servlet-name>
  	<url-pattern>/JasperServletJavaBean</url-pattern>
  </servlet-mapping>
</web-app>