Jasperreports+jaspersoft studio学习教程（八）- 报表分页和大量数据内存处理

其他 2018-08-08 10:06:15 阅读次数: 0

9.1 设计报表模板

9.1.1 使用Table组件新建模板（步骤参考教程七）如下：

9.1.2 模板自带变量

$V{PAGE_NUMBER} ：代表当前页数（可以是页码也可以是页数，通过TextField的计算时间的不同值来设置）

$V{PAGE_COUNT} ：当前页面中记录的数目

$V{groupname_COUNT} ：   代表当前组的记录数

$V{COLUMN_NUMBER} ：列号码

$V{COLUMN_COUNT} ：当前列中记录的数目（是当前页里行的序号，在新页上会重置为1）

$V{REPORT_COUNT} ：当前文档中数据源记录数目。

这里主要使用 $V{PAGE_NUMBER} 来做报表分页

对于$V{PAGE_NUMBER}:当evaluationTime="Now"时，即是计算当页所在哪一页。 (now:即时执行此表达式)

当evaluationTime="Report"时，计算最后一页，即总页数。(Report:整个报表执行完后才执行此表达式)

9.1.3 拖动6个Text Field组件到Page Footer Band中

设置 第几页 ，注意 其 Evaluation Time 选中 Now。

设置 共几页 ，注意 其 Evaluation Time 选中 Report。

9.1.4 设置 首页、上一页、下一页、末页 需要使用超链接

新建一个模板，把 首页 拷贝过去（这里使用DemoReport1.jrxml）

点击首页显示Properties ,搜索HyperLink PageException

设置 链接 为 “https://www.baidu.com/”

保存后，以 HTML 方式 Preview 后,点击首页跳转到百度。

9.1.5 设置 首页、上一页、下一页、末页

在 Hyperlink PageExpression 框中输入时需要注意，我们需要设定变量才能正确的导向是哪一页

以下是各选择在HyperlinkPage Expression框中输入的信息

首页   : "/JasperWeb/JasperServlet9?page=0"

上一页 :  "/JasperWeb/JasperServlet9?page="+($V{PAGE_NUMBER}-Long.valueOf("1"))

下一页 :  "/JasperWeb/JasperServlet9?page="+($V{PAGE_NUMBER}+Long.valueOf("1"))

末页   : "/JasperWeb/JasperServlet9?page=lastPage"

保存模板文件后拷贝到JasperWeb项目中

9.2 编写java代码，实现分页逻辑及大量数据内存处理

 

访问servlet,如下：

将第三页存储在磁盘中。


 

DemoReport9.jrxml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.4.0.final using JasperReports Library version 6.4.1  -->
<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="DemoReport9" pageWidth="842" pageHeight="595" orientation="Landscape" columnWidth="802" leftMargin="20" rightMargin="20" topMargin="0" bottomMargin="0" uuid="d7c90b7d-72ba-419f-94bd-d1d1ebac1597">
	<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
	<property name="com.jaspersoft.studio.unit." value="pixel"/>
	<property name="com.jaspersoft.studio.unit.pageHeight" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.pageWidth" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.topMargin" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.bottomMargin" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.leftMargin" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.rightMargin" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.columnWidth" value="pixel"/>
	<property name="com.jaspersoft.studio.unit.columnSpacing" value="pixel"/>
	<style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">
		<box>
			<pen lineWidth="0.5" lineColor="#000000"/>
			<topPen lineWidth="0.5" lineColor="#000000"/>
			<leftPen lineWidth="0.5" lineColor="#000000"/>
			<bottomPen lineWidth="0.5" lineColor="#000000"/>
			<rightPen lineWidth="0.5" lineColor="#000000"/>
		</box>
	</style>
	<style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">
		<box>
			<pen lineWidth="0.5" lineColor="#000000"/>
			<topPen lineWidth="0.5" lineColor="#000000"/>
			<leftPen lineWidth="0.5" lineColor="#000000"/>
			<bottomPen lineWidth="0.5" lineColor="#000000"/>
			<rightPen lineWidth="0.5" lineColor="#000000"/>
		</box>
	</style>
	<style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">
		<box>
			<pen lineWidth="0.5" lineColor="#000000"/>
			<topPen lineWidth="0.5" lineColor="#000000"/>
			<leftPen lineWidth="0.5" lineColor="#000000"/>
			<bottomPen lineWidth="0.5" lineColor="#000000"/>
			<rightPen lineWidth="0.5" lineColor="#000000"/>
		</box>
	</style>
	<subDataset name="Dataset1" uuid="38de2d28-85cc-4464-90e5-b3a328724707">
		<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
		<queryString>
			<![CDATA[]]>
		</queryString>
		<field name="userId" class="java.lang.Integer"/>
		<field name="userName" class="java.lang.String"/>
		<field name="grade" class="java.lang.String"/>
		<field name="college" class="java.lang.String"/>
		<field name="mobile" class="java.lang.String"/>
	</subDataset>
	<queryString>
		<![CDATA[]]>
	</queryString>
	<field name="tableData" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
	<field name="date" class="java.lang.String"/>
	<title>
		<band height="60" splitType="Stretch">
			<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
			<textField>
				<reportElement x="0" y="10" width="800" height="40" uuid="b96cd39e-8959-469c-bdb2-747d5750e575">
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑" size="24"/>
				</textElement>
				<textFieldExpression><![CDATA["用户信息表"]]></textFieldExpression>
			</textField>
		</band>
	</title>
	<pageHeader>
		<band height="30" splitType="Stretch">
			<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
			<textField>
				<reportElement x="640" y="0" width="160" height="30" uuid="aa748f9a-c2ff-4b50-bf34-b586e1e221cd"/>
				<textElement textAlignment="Right" verticalAlignment="Middle">
					<font fontName="微软雅黑"/>
				</textElement>
				<textFieldExpression><![CDATA["日期："+$F{date}]]></textFieldExpression>
			</textField>
		</band>
	</pageHeader>
	<detail>
		<band height="50" splitType="Stretch">
			<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
			<componentElement>
				<reportElement x="0" y="0" width="800" height="50" uuid="1adbebf1-674c-4aac-9b79-2afa0b77f6e6">
					<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
					<property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>
					<property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>
					<property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>
					<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
				</reportElement>
				<jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
					<datasetRun subDataset="Dataset1" uuid="65713b63-7b23-4cef-9297-cd0b0a50742d">
						<dataSourceExpression><![CDATA[$F{tableData}]]></dataSourceExpression>
					</datasetRun>
					<jr:column width="160" uuid="adf9bff4-2683-400d-8c4d-0c0984e93f0d">
						<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
						<property name="com.jaspersoft.studio.components.table.model.column.name" value="Column1"/>
						<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
						<jr:columnHeader style="Table_CH" height="30" rowSpan="1">
							<property name="com.jaspersoft.studio.unit.width" value="px"/>
							<textField>
								<reportElement x="0" y="0" width="160" height="30" uuid="0b36445f-cb93-4cc7-8467-1001e0bc9138"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑" size="14"/>
								</textElement>
								<textFieldExpression><![CDATA["学号"]]></textFieldExpression>
							</textField>
						</jr:columnHeader>
						<jr:detailCell style="Table_TD" height="20">
							<property name="com.jaspersoft.studio.unit.width" value="px"/>
							<property name="com.jaspersoft.studio.unit.height" value="px"/>
							<textField>
								<reportElement x="0" y="0" width="160" height="20" uuid="06cfd83a-dde4-44d9-bc68-52fe7ae14a8e"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑"/>
								</textElement>
								<textFieldExpression><![CDATA[$F{userId}]]></textFieldExpression>
							</textField>
						</jr:detailCell>
					</jr:column>
					<jr:column width="160" uuid="10201ee5-5600-4d8d-966d-e8d3f6976801">
						<property name="com.jaspersoft.studio.components.table.model.column.name" value="Column2"/>
						<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
						<jr:columnHeader style="Table_CH" height="30" rowSpan="1">
							<property name="com.jaspersoft.studio.unit.width" value="px"/>
							<textField>
								<reportElement x="0" y="0" width="160" height="30" uuid="14d03642-b623-4b5b-b719-2fe8bbaa0a4e"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑" size="14"/>
								</textElement>
								<textFieldExpression><![CDATA["姓名"]]></textFieldExpression>
							</textField>
						</jr:columnHeader>
						<jr:detailCell style="Table_TD" height="20">
							<textField>
								<reportElement x="0" y="0" width="160" height="20" uuid="06001ccc-e18d-4f17-b579-151a8a0d1d57"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑"/>
								</textElement>
								<textFieldExpression><![CDATA[$F{userName}]]></textFieldExpression>
							</textField>
						</jr:detailCell>
					</jr:column>
					<jr:column width="160" uuid="3a5875e8-f8d4-4289-a2c0-339f203a0a9c">
						<property name="com.jaspersoft.studio.components.table.model.column.name" value="Column3"/>
						<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
						<jr:columnHeader style="Table_CH" height="30" rowSpan="1">
							<property name="com.jaspersoft.studio.unit.width" value="px"/>
							<textField>
								<reportElement x="0" y="0" width="160" height="30" uuid="fecac7e3-9c5f-4ae5-b9bf-e740cb1acaa9"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑" size="14"/>
								</textElement>
								<textFieldExpression><![CDATA["年级"]]></textFieldExpression>
							</textField>
						</jr:columnHeader>
						<jr:detailCell style="Table_TD" height="20">
							<textField>
								<reportElement x="0" y="0" width="160" height="20" uuid="449cd8b8-e07e-44d6-a654-9382041e19b6"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑"/>
								</textElement>
								<textFieldExpression><![CDATA[$F{grade}]]></textFieldExpression>
							</textField>
						</jr:detailCell>
					</jr:column>
					<jr:column width="160" uuid="8d0acd4a-e38f-452e-8f83-b9f471cc6e6c">
						<property name="com.jaspersoft.studio.components.table.model.column.name" value="Column4"/>
						<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
						<jr:columnHeader style="Table_CH" height="30" rowSpan="1">
							<property name="com.jaspersoft.studio.unit.width" value="px"/>
							<textField>
								<reportElement x="0" y="0" width="160" height="30" uuid="71f6ec6b-9fff-4033-a6b3-4859cef156b9"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑" size="14"/>
								</textElement>
								<textFieldExpression><![CDATA["学院"]]></textFieldExpression>
							</textField>
						</jr:columnHeader>
						<jr:detailCell style="Table_TD" height="20">
							<textField>
								<reportElement x="0" y="0" width="160" height="20" uuid="c4d5d4f7-e9fe-4a19-b8d6-09e8043ea51a"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑"/>
								</textElement>
								<textFieldExpression><![CDATA[$F{college}]]></textFieldExpression>
							</textField>
						</jr:detailCell>
					</jr:column>
					<jr:column width="160" uuid="f05e42f0-7427-4e35-a528-fed13c202a0a">
						<property name="com.jaspersoft.studio.components.table.model.column.name" value="Column5"/>
						<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
						<jr:columnHeader style="Table_CH" height="30" rowSpan="1">
							<property name="com.jaspersoft.studio.unit.width" value="px"/>
							<textField>
								<reportElement x="0" y="0" width="160" height="30" uuid="ab76786f-1468-43cb-965e-6469f9f21363"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑" size="14"/>
								</textElement>
								<textFieldExpression><![CDATA["手机"]]></textFieldExpression>
							</textField>
						</jr:columnHeader>
						<jr:detailCell style="Table_TD" height="20">
							<textField>
								<reportElement x="0" y="0" width="160" height="20" uuid="5db1623e-b62b-449c-82ed-e796243710e7"/>
								<textElement textAlignment="Center" verticalAlignment="Middle">
									<font fontName="微软雅黑"/>
								</textElement>
								<textFieldExpression><![CDATA[$F{mobile}]]></textFieldExpression>
							</textField>
						</jr:detailCell>
					</jr:column>
				</jr:table>
			</componentElement>
		</band>
	</detail>
	<pageFooter>
		<band height="54" splitType="Stretch">
			<textField hyperlinkType="Reference">
				<reportElement x="620" y="5" width="30" height="20" uuid="e77c471c-6f7a-4611-aa73-fb7e3a88c93d">
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑"/>
				</textElement>
				<textFieldExpression><![CDATA["首页"]]></textFieldExpression>
				<hyperlinkReferenceExpression><![CDATA["/JasperWeb/JasperServlet9?page=0"]]></hyperlinkReferenceExpression>
			</textField>
			<textField hyperlinkType="Reference">
				<reportElement x="650" y="5" width="50" height="20" uuid="6709103c-8b77-4690-b2e4-468bd8e5544e">
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑" size="10"/>
				</textElement>
				<textFieldExpression><![CDATA["上一页"]]></textFieldExpression>
				<hyperlinkReferenceExpression><![CDATA["/JasperWeb/JasperServlet9?page="+($V{PAGE_NUMBER}-Long.valueOf("1"))]]></hyperlinkReferenceExpression>
			</textField>
			<textField hyperlinkType="Reference">
				<reportElement x="700" y="5" width="50" height="20" uuid="4263bf73-f221-41b4-9df2-4eaeea435a9f">
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑"/>
				</textElement>
				<textFieldExpression><![CDATA["下一页"]]></textFieldExpression>
				<hyperlinkReferenceExpression><![CDATA["/JasperWeb/JasperServlet9?page="+($V{PAGE_NUMBER}+Long.valueOf("1"))]]></hyperlinkReferenceExpression>
			</textField>
			<textField hyperlinkType="Reference">
				<reportElement x="750" y="5" width="30" height="20" uuid="704e48cb-9208-4703-b260-05662ea65334">
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑"/>
				</textElement>
				<textFieldExpression><![CDATA["末页"]]></textFieldExpression>
				<hyperlinkReferenceExpression><![CDATA["/JasperWeb/JasperServlet9?page=lastPage"]]></hyperlinkReferenceExpression>
			</textField>
			<textField>
				<reportElement x="510" y="5" width="50" height="20" uuid="b1b31a99-915b-479b-8eb2-e7496ec9021f">
					<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑"/>
				</textElement>
				<textFieldExpression><![CDATA["第"+$V{PAGE_NUMBER}+"页"]]></textFieldExpression>
			</textField>
			<textField evaluationTime="Report">
				<reportElement x="560" y="5" width="60" height="20" uuid="6f34ea83-3dde-4765-b882-82997673eeaf">
					<property name="com.jaspersoft.studio.unit.y" value="pixel"/>
					<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
				</reportElement>
				<textElement textAlignment="Center" verticalAlignment="Middle">
					<font fontName="微软雅黑" size="10"/>
				</textElement>
				<textFieldExpression><![CDATA["共"+$V{PAGE_NUMBER}+"页"]]></textFieldExpression>
			</textField>
		</band>
	</pageFooter>
</jasperReport>

JasperServlet9.java

package com.jasper.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JRParameter;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.fill.JRFileVirtualizer;

import com.jasper.bean.ModelTableSource;
import com.jasper.bean.Users;

@WebServlet("/JasperServlet9")
public class JasperServlet9 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public JasperServlet9() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		Map<String,Object> parameters = new HashMap<String,Object>(16);
		String pageStr = request.getParameter("page");
		HttpSession session = request.getSession();
		int pageIndex = 0;
		int lastPageIndex = 0;
		
		//list数据源
		List<Users> list = new ArrayList<Users>();
		for(int i = 1 ; i <= 50 ; i++) {
			Users users = new Users(i,"name"+i,"grade"+i,"college"+i,"mobile"+i);
			list.add(users);
		}
		ModelTableSource mts = new ModelTableSource();
		mts.setDate(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
		mts.setTableData(new JRBeanCollectionDataSource(list));
		List<ModelTableSource> mlist = new ArrayList<ModelTableSource>();
		mlist.add(mts);
		
		String jrxmlPath = request.getServletContext().getRealPath("/")+"/jrxml/DemoReport9.jrxml";
		//由jrxml文件编译后生产jasper文件的路径
		String jasperPath = request.getServletContext().getRealPath("/")+"/jasper/DemoReport9.jasper";
		PrintWriter out = null;
		try {
           
			//编译jrxml生产jasper文件
			JasperCompileManager.compileReportToFile(jrxmlPath, jasperPath);
            //JasperPrint将数据全部取出，放到session中
			JasperPrint jasperPrint = (JasperPrint) session.getAttribute("jasperPrint");
			if(null == jasperPrint) {
				jasperPrint = this.getJasperPrint(jasperPath, parameters, mlist);
				session.setAttribute("jasperPrint", jasperPrint);
			}
    		if(null != jasperPrint.getPages()) {
    			lastPageIndex = jasperPrint.getPages().size() - 1;
    		}
    		if(null == pageStr) {
    			pageStr = "0";
    		}
    		try {
    			pageIndex = Integer.valueOf(pageStr);
    			if(pageIndex > 0) {
    				pageIndex = pageIndex -1 ;
    			}
    		} catch (Exception e) {
    			// 如果得到的非数字字符串
    			if("lastPage".equals(pageStr)) {
    				pageIndex = lastPageIndex;
    			}
    		}
    		
    		if (pageIndex < 0) {
    			pageIndex = 0;
    		}
    		if (pageIndex > lastPageIndex) {
    			pageIndex = lastPageIndex;
    		}
    		//将html输出到浏览器上
            JRHtmlExporter exporter = new JRHtmlExporter();
            response.setCharacterEncoding("UTF-8");
    		out = response.getWriter();
    		//分页
    		exporter.setParameter(JRExporterParameter.PAGE_INDEX, pageIndex);
    		exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
    		exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
    		exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
    		exporter.exportReport();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
        	out.flush();
        	out.close();
        }
	}
	
	
	private JasperPrint getJasperPrint(String jasperPath, Map<String, Object> parameters, List<?> list) throws JRException {
		//解决大数据量保留在内存中,只在内存中保留两页，剩下的放入磁盘中
		JRFileVirtualizer virtualizer = new JRFileVirtualizer(2, "D:/");
		parameters.put(JRParameter.REPORT_VIRTUALIZER, virtualizer);
		virtualizer.setReadOnly(true);
		return JasperFillManager.fillReport(jasperPath, parameters, new JRBeanCollectionDataSource(list));	 
	}
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}

}

ModelTableSource.java

package com.jasper.bean;

import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;

public class ModelTableSource {
	/**
	 * 注入table组件的数据源
	 */
	private JRBeanCollectionDataSource tableData;
	/**
	 * 当前时间(查询时间)
	 */
	private String date;
	public JRBeanCollectionDataSource getTableData() {
		return tableData;
	}
	public void setTableData(JRBeanCollectionDataSource tableData) {
		this.tableData = tableData;
	}
	public String getDate() {
		return date;
	}
	public void setDate(String date) {
		this.date = date;
	}
	
	
}

Users.java

package com.jasper.bean;

public class Users {
	
	private Integer userId;
	private String userName;
	private String grade;
	private String college;
	private String mobile;
	public Integer getUserId() {
		return userId;
	}
	public void setUserId(Integer userId) {
		this.userId = userId;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getGrade() {
		return grade;
	}
	public void setGrade(String grade) {
		this.grade = grade;
	}
	public String getCollege() {
		return college;
	}
	public void setCollege(String college) {
		this.college = college;
	}
	public String getMobile() {
		return mobile;
	}
	public void setMobile(String mobile) {
		this.mobile = mobile;
	}
	public Users(Integer userId, String userName, String grade, String college, String mobile) {
		super();
		this.userId = userId;
		this.userName = userName;
		this.grade = grade;
		this.college = college;
		this.mobile = mobile;
	}
	public Users() {
		super();
	}
	
	

}

 代码下载：https://download.csdn.net/download/u013456370/10588521

猜你喜欢

转载自blog.csdn.net/u013456370/article/details/81481804
今日推荐
开源日报 | Chrome内置Gemini的意义不在于Gemini；中国AI追随之路的五大误区；ECharts创始人“下海”养鱼；谷歌I/O开发者大会什么都有，只是没有惊喜
微软回应中国区AI团队“打包赴美”传闻
基于大语言模型的开源知识库问答系统 MaxKB GitHub Star 数量突破 5,000 个！
美国拟限制 AI 大模型出口中国和俄罗斯
苹果将与 OpenAI 达成协议，将 ChatGPT 应用于 iPhone
openKylin 社区生态委员会第六次会议圆满召开
阿里云正式发布通义千问 2.5
Python 3.13 发布首个 Beta：实验性自由线程模式和 JIT、改进交互式解释器
Stack Overflow 拿我的代码去训练 AI 大模型，还封了我的账号
Pop!_OS 的 COSMIC 桌面完成 App Store 上架工作
《2024 年一季度互联网投融资运行情况》研究报告
报告：Django 仍然是 74% 开发者的首选
周排行
laravle中orm简单的增删改查
文本分类 特征选取之CHI开方检验
Spark核心编程-WordCount
大数据开发实战系列之电信客服(1)
读书笔记 - 把时间当作朋友 by 李笑来
python 笔记--if else
SpringBoot/Mybatis/Druid, 多数据源MultiDataSource配置思路
排序三个整数
redis集群搭建【2】-Windows中Redis集群搭建
STM32F030驱动TM1650点亮4联数码管
每日归档
更多
2024-05-16(6)
2024-05-15(24)
2024-05-14(0)
2024-05-13(18)
2024-05-12(0)
2024-05-11(38)
2024-05-10(38)
2024-05-09(35)
2024-05-08(42)
2024-05-07(14)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022