java struts2 JasperReports 生成pdf文件

jasperreport


JAVA生成PDF，最常见的是采用itext组件来动态构建PDF文件，但仅仅用itext生成的PDF，只能靠人为的一点一点来用代码来控制PDF的格式，不能达到可视化的效果。

因此，在这里，我主要介绍的是采用jasperreport模版来定制生成PDF。

1、用ireport定制一个jasperreport的模版

2、用java操作此模版

第1步，这里就不做介绍，很简单的，几乎是所看即所得的视图操作



第2步，大家请看我的java代码，已经测试过，没有问题

注意：下面代码是运行在java1.5或更高版本

需要额外导入jasperreports-3.0.0.jar,itext-1.3.1.jar,iTextAsian.jar三个jar包

package product.file.report.jasperreport; 


import java.io.OutputStream; 

import java.util.ArrayList; 

import java.util.HashMap; 

import java.util.Iterator; 

import java.util.List; 

import java.util.Map; 

import java.util.Set; 


import product.file.report.ReportGenerater; 

import net.sf.jasperreports.engine.JRDataSource; 

import net.sf.jasperreports.engine.JRException; 

import net.sf.jasperreports.engine.JasperExportManager; 

import net.sf.jasperreports.engine.JasperPrint; 

import net.sf.jasperreports.engine.JasperReport; 

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

import net.sf.jasperreports.engine.fill.JRFiller; 

import net.sf.jasperreports.engine.util.JRLoader; 


@SuppressWarnings("unchecked") 

public class JasperGenerater implements ReportGenerater{ 


 //生成PDF 

 public void generatePdf(String template, String output, Map param, Map<String, List<Map>> datasource){ 


 JasperReport jasper = this.loadTemplate(template); //加载japserreport模版 

 JasperPrint jPrint = this.fileReport(jasper, param, datasource); //填充数据 

 try { 

 JasperExportManager.exportReportToPdfFile(jPrint, output); //生成PDF文件 

 } catch (JRException e) { 

 throw new RuntimeException(); 

 } 

 } 


 //生成Html 

 public void generateHtml(String template, String output, Map param, Map<String, List<Map>> datasource){ 

 JasperReport jasper = this.loadTemplate(template); //加载japserreport模版 

 JasperPrint jPrint = this.fileReport(jasper, param, datasource); //填充数据 

 try { 

 JasperExportManager.exportReportToHtmlFile(jPrint, output); //生成html文件 

 } catch (JRException e) { 

 throw new RuntimeException(); 

 } 

 } 


 //生成PDF输出流 

 public void generatePdf(String template, OutputStream os, Map param, Map<String, List<Map>> datasource){ 


 JasperReport jasper = this.loadTemplate(template); //加载japserreport模版 

 JasperPrint jPrint = this.fileReport(jasper, param, datasource); //填充数据 

 try { 

 JasperExportManager.exportReportToPdfStream(jPrint, os); //生成PDF文件流 

 } catch (JRException e) { 

 throw new RuntimeException(); 

 } 

 } 


 //加载报表模版 

 private JasperReport loadTemplate(String template){ 

 try { 

 JasperReport jasper = (JasperReport)JRLoader.loadObject(template); 

 return jasper; 

 } catch (JRException e) { 

 throw new RuntimeException("JRException"); 

 } 

 } 


 //填充报表数据 

 private JasperPrint fileReport(JasperReport jasper, Map param, Map<String, List<Map>> datasource){ 

 Set keyset = datasource.keySet(); 

 Iterator itor = keyset.iterator(); 

 while(itor.hasNext()){ 

 String tokey = String.valueOf(itor.next()); 

 JRDataSource jrDs = new JRMapCollectionDataSource(datasource.get(tokey)); 

 param.put(tokey, jrDs); 

 } 


 try { 

 JasperPrint jPrint = JRFiller.fillReport(jasper, param); 

 return jPrint; 

 } catch (JRException e) { 

 throw new RuntimeException(); 

 } 

 } 


 //测试Main 

 public static void main(String[] args){ 

 JasperGenerater jasperGenerater = new JasperGenerater(); 

 String template = "D://编程工具//ireport//user.jasper"; //jasper模版 

 String outputfile = "D://测试.PDF"; //输出路径 


 Map<String,List<Map>> datasource = new HashMap<String,List<Map>>(); //数据源；可为多List 

 List<Map> list = new ArrayList<Map>(); 

 for(int i=0; i<10; i++){ 

 Map cur = new HashMap(); 

 cur.put("USER_ID", "USER"+i); 

 cur.put("USER_NAME", "用户"+i); 

 cur.put("LOGIN_COUNT", i); 

 list.add(cur); 

 } 

 datasource.put("REPORT_DATA_SOURCE", list); //指定数据源 


 Map param = new HashMap(); //参数 


 param.put("title", "用户登陆统计"); 

 param.put("date", "2009.01.01——2009.08.08"); 

 jasperGenerater.generatePdf(template, outputfile, param, datasource); //生成PDF文件 


 } 



}