ireport制作报表的流程:
首先,我们用ireport设计报表的样式,通过编译生成.jasper文件,为java做准备。
其次,我们在java中定义report公共类,来解析.jasper文件。
最后,通过流输出到页面显示。
1.用ireport设计简单报表:在这里我们选用ireport3.0,因为3.0比较稳定。
1.1,首先,新建一个报表文件,如下图:有title、pageHeader、columnHeader......等等栏。
1.2,title栏是用来放置标题的;pageHeader栏是放副标题和日期等;columnHeader栏是放表头的;detail栏是放详细信息(向下遍历数据显示);summary栏是放置图和交叉报表的;左下角的文件结构有“参数”、“字段”和变量,参数是用来定义一些静态文本的,可以通过后台进行传值,字段是定义VO的属性,变量是用来参与运算的;
1.2.1首先我们来定义一个参数叫做title,选择参数--->"添加"----->parameter,如下图:
在弹出的对话框的参数名中输入title后点击确定,然后将title参数拖拽到title栏中,如下图:
在这里我们可以设置title的字体、大小和位置等。
1.2.2用同样的方法我们建立两个字段:username和password:
分别拖拽到detail栏中,并调整大小、位置和边界:
接下来我们可在对于的列上加上表头:点击工具栏的“T”静态文本,在columnHeader栏中画出:
以上一个简单的报表就画好了,我们点击工具栏的“执行报表”按钮,编译成.jasper文件。
1.3,接下来我们定义java类Reports.java:
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JExcelApiExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.export.JRXlsExporterParameter;
import net.sf.jasperreports.engine.util.JRLoader;
public class Reports {
/**//*
* 生成HTML报表显示
*/
public void selectHtmlReport(List list,HttpServletResponse response,String url,Map map){
response.setContentType("text/html;charset=utf-8");
File reportFile = new File(url);
JasperReport jasperReport = null;
try {
jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
} catch (JRException e) {
e.printStackTrace();
}
JRBeanCollectionDataSource jrbean = new JRBeanCollectionDataSource(list);
JasperPrint jasperPrint = null;
try {
jasperPrint = JasperFillManager.fillReport(jasperReport,map,jrbean);
} catch (JRException e) {
e.printStackTrace();
}
JRHtmlExporter exporter = new JRHtmlExporter();
PrintWriter out = null;
try {
out = response.getWriter();
} catch (IOException e) {
e.printStackTrace();
}
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
exporter.setParameter(JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,Boolean.TRUE);
try {
exporter.exportReport();
} catch (JRException e) {
e.printStackTrace();
}
}
/**//*
* 导出EXCEL报表
*/
public void selectExcelReport(List list,HttpServletResponse response,String url,Map map,String reportName){
try{
//加载jasper文件
File reportFile = new File(url);
JasperReport jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
//装载数据
JRBeanCollectionDataSource jrbean = new JRBeanCollectionDataSource(list);
//构造jasperPrint对象
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, map, jrbean);
//输出流
ByteArrayOutputStream oStream = new ByteArrayOutputStream();
//构造输出对象
JExcelApiExporter exporter = new JExcelApiExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,"./image?image=");
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
exporter.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,Boolean.TRUE); // 删除记录最下面的空行
exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,Boolean.FALSE);// 删除多余的ColumnHeader
exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,Boolean.FALSE);// 显示边框
exporter.exportReport();
//excel文件名
String fileName = reportName + ".xls";
response.reset();
response.setHeader("Content-Disposition", "attachment;filename=\"" + URLEncoder.encode(fileName,"utf-8") + "\"");
//写输出流
byte[] bytes = oStream.toByteArray();
if(bytes != null && bytes.length > 0) {
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setContentLength(bytes.length);
ServletOutputStream ouputStream = response.getOutputStream();
ouputStream.write(bytes,0,bytes.length);
ouputStream.flush();
ouputStream.close();
}else{
}
}catch(Exception ex){
ex.printStackTrace();
}
}
/**
* 功能:生成默认图形报表的处理方法
* 方法名:selectHtmlReport
* @param List list 数据集
* @param HttpServletResponse response
* @param HttpServletRequest request
* @param String url 解析的报表文件
* @param Map map 报表用的参数
* @author 郭洪治 2010-03-15
* @return void
*/
public void selectHtmlReport(List list,HttpServletResponse response,HttpServletRequest request,String url,Map map){
response.setContentType("text/html;charset=utf-8");
File reportFile = new File(url);
JasperReport jasperReport = null;
try {
jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
} catch (JRException e) {
e.printStackTrace();
}
JRBeanCollectionDataSource jrbean = new JRBeanCollectionDataSource(list);
JasperPrint jasperPrint = null;
//设置报表图形默认存放物理目录
String outPutDir = request.getSession().getServletContext().getRealPath("/")+"/reportimg/";
//加载图形报表的相对目录
String sourceDir = request.getContextPath()+"/reportimg/";
try {
File file = new File(outPutDir);
//判断此目录是否存在
if(!file.exists()){
file.mkdir();
}
jasperPrint = JasperFillManager.fillReport(jasperReport,map,jrbean);
} catch (JRException e) {
e.printStackTrace();
}
JRHtmlExporter exporter = new JRHtmlExporter();
PrintWriter out = null;
try {
out = response.getWriter();
} catch (IOException e) {
e.printStackTrace();
}
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR_NAME,outPutDir);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,sourceDir);
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
exporter.setParameter(JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,Boolean.TRUE);
try {
exporter.exportReport();
} catch (JRException e) {
e.printStackTrace();
}
}
/**
* 功能:生成指定目录图形报表查询的处理方法
* @param List list 数据集
* @param HttpServletResponse response
* @param HttpServletRequest request
* @param String url 解析的报表文件
* @param Map map 报表用的参数
* @param String imgDir 图形生成的目录
* @author 郭洪治2010-01-20
* @return void
*/
public void selectHtmlReport(List list,HttpServletResponse response,HttpServletRequest request,String url,Map map,String imgDir){
response.setContentType("text/html;charset=utf-8");
File reportFile = new File(url);
JasperReport jasperReport = null;
//生成图形目录
String outPutDir = request.getSession().getServletContext().getRealPath("/")+"/"+imgDir;
//图形源目录
String sourceDir = request.getContextPath()+"/"+imgDir;
try {
jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
} catch (JRException e) {
e.printStackTrace();
}
JRBeanCollectionDataSource jrbean = new JRBeanCollectionDataSource(list);
JasperPrint jasperPrint = null;
try {
jasperPrint = JasperFillManager.fillReport(jasperReport,map,jrbean);
} catch (JRException e) {
e.printStackTrace();
}
JRHtmlExporter exporter = new JRHtmlExporter();
PrintWriter out = null;
try {
out = response.getWriter();
} catch (IOException e) {
e.printStackTrace();
}
//设置图片存入的物理目录
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR_NAME,outPutDir);
//设置图片显示的目录
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,sourceDir);
//生成图片到目录
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
exporter.setParameter(JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,Boolean.TRUE);
try {
exporter.exportReport();
} catch (JRException e) {
e.printStackTrace();
}
}
/**
* 功能:导出多sheet报表的处理方法
* 方法名:selectAllExcelReport
* @param List list 数据集
* @param HttpServletResponse response
* @param String url 解析的报表文件
* @param String reportName 生成excel保存的名字
* @author 郭洪治
* 创建时间:Nov 3, 2009 2:08:31 PM
*/
@SuppressWarnings("unchecked")
public void selectAllExcelReport(List list,HttpServletResponse response,String url,String reportName){
try{
//加载jasper文件
File reportFile = new File(url);
JasperReport jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
List jasperPrintList = new ArrayList();
int listSize = list.size();
String sheetNamesArray[] = new String[listSize];
for(int i = 0; i < listSize; i++){
Map eachMap = (Map)list.get(i);
List eachList = (List)eachMap.get("ls");
sheetNamesArray[i] = (String)eachMap.get("title");
//装载数据
JRBeanCollectionDataSource jrbean = new JRBeanCollectionDataSource(eachList);
//构造jasperPrint对象
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, eachMap, jrbean);
jasperPrintList.add(jasperPrint);
}
//输出流
ByteArrayOutputStream oStream = new ByteArrayOutputStream();
//构造输出对象
JExcelApiExporter exporter = new JExcelApiExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,"./image?image=");
exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, jasperPrintList);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
exporter.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,Boolean.TRUE); // 删除记录最下面的空行
exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,Boolean.FALSE);// 删除多余的ColumnHeader
exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,Boolean.FALSE);// 显示边框
exporter.setParameter(JRXlsExporterParameter.SHEET_NAMES, sheetNamesArray);
exporter.exportReport();
//写输出流
byte[] bytes = oStream.toByteArray();
if(bytes != null && bytes.length > 0) {
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setContentLength(bytes.length);
//excel文件名
String fileName = reportName + ".xls";
response.setHeader("Content-Disposition", "attachment;filename=\"" + URLEncoder.encode(fileName,"utf-8") + "\"");
ServletOutputStream ouputStream = response.getOutputStream();
ouputStream.write(bytes,0,bytes.length);
ouputStream.flush();
ouputStream.close();
}
}catch(Exception ex){
ex.printStackTrace();
}
}
}
1.4,在action中调用:
Map<String,String> parameters = new HashMap<String,String>();//定义参数map
parameters.put("title", "我的报表"); //添加参数
String url = “WEB-INF/report/test.jasper";//定义报表文件路径
Reports report = new Reports();//创建报表类对象
report.selectHtmlReport(list, response, url, parameters);//调用生成表方法
其中list是从数据库中查询的值,放的是VO对象,VO对象的属性和.jasper报表文件中定义的字段要一一对应。
在这里VO类的定义略。
导出报表调用的方法:report.selectExcelReport(list, response, url, parameters );
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