使用jasperreposts生成报表方法二，三

第二种方法：在后台工具类中将我们要需要的报表类型转成byte数组，然后再jsp页面重组得到报表，补充一下我这里的是直接让报表在浏览器中在线打开的（三种方法都是）
工具类：
package com.unite.util_jasperreports;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperExportManager;
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.export.JRXlsExporter;
import net.sf.jasperreports.engine.export.JRXlsExporterParameter;

public class JrtsUtil {

       
        public static byte[] generatePDF(String reportTitle, String reportFilePath,List<Object> list) throws FileNotFoundException  {
              // TODO Auto-generated method stub
              //begCustNo,endCustNo分别为查询传入的开始编号，结束编号.
              //jdbcCustomerDao = new JdbcCustomerDao();
             
              Map parameters = new HashMap();//参数设定
              parameters.put("lie", "select * from User");//报表标题
             
              //List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
               try {
                   JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
                  
                   JasperPrint jasperPrint = JasperFillManager.fillReport(reportFilePath, parameters, ds);
                  
                  
                  
                   return JasperExportManager.exportReportToPdf(jasperPrint);
              return null;
               } catch (JRException e) {
                   e.printStackTrace();
                   return null;
              }
         }
       
        public static void main(String[] args) {
            try {
                generatePDF("dsf","/iReport/report1.jasper",new ArrayList());
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
       
        public static  byte[] generateHtml(String reportTitle, String reportFilePath,List<Object> list)  {
            // jdbcCustomerDao = new JdbcCustomerDao();
         
            Map parameters = new HashMap();//参数设定
             parameters.put("lie", "select * from User");
         
          //List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);//获取数据
         
          JRHtmlExporter exporter = new JRHtmlExporter();
         
          ByteArrayOutputStream oStream = new ByteArrayOutputStream();
         
          try {
           JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
          
           JasperPrint jasperPrint = JasperFillManager.fillReport(reportFilePath, parameters, ds);
          
          exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,Boolean.FALSE);
          
           exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
          
           exporter.setParameter(JRExporterParameter.CHARACTER_ENCODING, "GBK");
          
           exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
          
           exporter.exportReport();
          
           byte[] bytes = oStream.toByteArray();
          
           return bytes;
          } catch (JRException e) {
            e.printStackTrace();
            return null;
          }
         }
       
       
        public static byte[] generateExcel(String reportTitle, String reportFilePath,List<Object> list) {
          //jdbcCustomerDao = new JdbcCustomerDao();
           
          Map parameters = new HashMap();//参数设定
          parameters.put("lie", "select * from User");
         
          //List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
         
          JRXlsExporter exporter = new JRXlsExporter(); // Excel
         
          ByteArrayOutputStream oStream = new ByteArrayOutputStream();
         
          try {
           JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
          
           JasperPrint jasperPrint = JasperFillManager.fillReport(reportFilePath, parameters, ds);
          
           exporter.setParameter(JRExporterParameter.JASPER_PRINT,
                   jasperPrint);
           exporter.setParameter(JRExporterParameter.OUTPUT_STREAM,
                   oStream);
          exporter.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,
             Boolean.TRUE);
           exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,
             Boolean.FALSE);
           exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,
             Boolean.FALSE);
          
           exporter.exportReport();
          
           byte[] bytes = oStream.toByteArray();
          
           return bytes;

          } catch (JRException e) {
           e.printStackTrace();
           return null;
          }
         }
}
jsp页面：
exclede :
<%
      //String filePath=getServletContext().getRealPath("/")+"report1.jasper";
      String filePath = "/iReport/report1.jasper";//模板的路径
      
      byte[] bytes=null;
      //String begNo=request.getParameter("beginCustNo");
      //String endNo=request.getParameter("endCustNo");
      String type="html";
   
        List list = new ArrayList();//数据数组

      if(type.equals("Pdf")){
          bytes= JrtsUtil.generatePDF("客户资料明细表",filePath,list);
      }else if(type.equals("Excel")){
             bytes=JrtsUtil.generateExcel("客户资料明细表",filePath,list);
      }else{
          bytes=JrtsUtil.generateHtml("客户资料明细表",filePath,list);
      }
   
    try{
         if(bytes!=null){
              if(type.equals("Pdf")){
                 // response.setContentType("application/pdf");
                 response.encodeRedirectUrl("report1.pdf");
                 //response.encodeUrl()
              }else if(type.equals("Excel")){
                 response.setContentType("application/vnd.ms-excel");
              }else if(type.equals("html")){
                   response.setContentType("text/html");
                response.setContentLength(bytes.length);
                ServletOutputStream ouputStream = response.getOutputStream();
                ouputStream.write(bytes,0,bytes.length);
                ouputStream.flush();
                ouputStream.close();
              }
         }else{
              out.println("error");
         }
     }catch(Exception e){
         out.print("错误信息："+e.getMessage());
     }finally{
         out.clear();//在tomcat5下jsp中出现此错误一般都是在jsp中使用了输出流（如输出图片验证码，文件下载等），
                        //没有妥善处理好的原因。
        out = pageContext.pushBody();
     }
  %>

第三种方法：直接在jsp页面上使用

<%
        // 加载.jasper文件
       File jasperRile = new File(ServletActionContext.getServletContext().getRealPath("/iReport/report1.jasper"));
         // 构造JasperReport 文件
       JasperReport jasperReport = (JasperReport)JRLoader.loadObject(jasperRile.getPath());
      
       //参数处理
        Map parameters = new HashMap();
        parameters.put("lie", "select * from User");
      
       // 用数据填充JasperReport文件
       JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters,SSS.testReport1());
      
        // 声明导出对像
       JRXlsExporter exporter = new JRXlsExporter();
       // 设置导出哪个模板
       exporter.setParameter(JRXlsExporterParameter.JASPER_PRINT, jasperPrint);
     
       // 设置导出流
       exporter.setParameter(JRXlsExporterParameter.OUTPUT_STREAM, response.getOutputStream());
      
       // 设置Xls的属性  
       exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);  
       exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE); 
       // 告诉浏览器是导出操EXCEL文件操作
       response.setHeader("Content-Disposition", "attachment; filename=cyjgcyb.xls");
       response.setContentType("application/vnd.ms-excel");
      
       exporter.exportReport();
     
      
       out.clear();//在tomcat5下jsp中出现此错误一般都是在jsp中使用了输出流（如输出图片验证码，文件下载等），
                        //没有妥善处理好的原因。
       out = pageContext.pushBody();
   %>

html格式的：
<%
        // 加载.jasper文件
      File jasperRile = new File("/iReport/report1.jasper");
         // 构造JasperReport 文件
       JasperReport jasperReport = (JasperReport)JRLoader.loadObject(jasperRile.getPath());
      
       //参数处理
        Map parameters = new HashMap();
        parameters.put("lie", "select * from User");
      
       // 用数据填充JasperReport文件
       JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters,SSS.testReport1());
      
       // 声明HTML类型的导出类
       JRHtmlExporter exporter = new JRHtmlExporter();
       // 设置导出JASPER_PRINT
       exporter.setParameter(JRHtmlExporterParameter.JASPER_PRINT, jasperPrint);
     
       // 设置导出流
       exporter.setParameter(JRHtmlExporterParameter.OUTPUT_WRITER, response.getWriter());
       // 设置IS_USING_IMAGES_TO_ALIGN为false,不显示图片
       exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
       // 导出编码
       exporter.setParameter(JRHtmlExporterParameter.CHARACTER_ENCODING, "gb2312");
       // 导出
       exporter.exportReport();
      
       out.clear();//在tomcat5下jsp中出现此错误一般都是在jsp中使用了输出流（如输出图片验证码，文件下载等），
                        //没有妥善处理好的原因。
       out = pageContext.pushBody();
  %>

pdf格式的：
<%
        // 加载.jasper文件
       File jasperRile = new File(ServletActionContext.getServletContext().getRealPath("/iReport/report1.jasper"));
       
     
      try{
           // 构造JasperReport 文件
           JasperReport jasperReport = (JasperReport)JRLoader.loadObject(jasperRile.getPath());
           //参数处理
            Map parameters = new HashMap();
            parameters.put("lie", "select * from User");
           // 用数据填充JasperReport文件
           JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, SSS.testReport1());
       
           // pdf导出设置
            response.setContentType("application/pdf");
            response.setCharacterEncoding("UTF-8");
 
            // 使用JRPdfExproter导出器导出pdf  
            JRPdfExporter exporter = new JRPdfExporter();  
            // 设置JasperPrintList  
            exporter.setParameter(JRPdfExporterParameter.JASPER_PRINT, jasperPrint);  
            // 设置导出流
            exporter.setParameter(JRPdfExporterParameter.OUTPUT_STREAM, response.getOutputStream());
            // 开始导出
            exporter.exportReport();
           
            out.clear();//在tomcat5下jsp中出现此错误一般都是在jsp中使用了输出流（如输出图片验证码，文件下载等），
                        //没有妥善处理好的原因。
               out = pageContext.pushBody();
           
         }catch(Exception e){
               e.printStackTrace();
          }
%>

到此三种方法列举完毕，置于他们之间运用时的差别改天在写