如何在新 window 中打开导出为 pdf 的 jasper 报告

Question

我一直在将 jasper 报告导出为 pdf，但它在同一个 window 中打开，这对我来说是个问题，因为如果我想转到上一页，我无法转到上一页，所以我想在新的 window 中打开 pdf 页面，但我不知道如何在新的 window 中打开它。

sample1.jsp

<%@ page  import="java.io.*"%> 
<%@ page  import="java.sql.Connection"%> 
<%@ page  import="java.sql.DriverManager"%>
<%@ page  import="java.util.HashMap"%>
<%@ page  import="java.util.Map"%>
<%@ page  import="net.sf.jasperreports.engine.*"%>
<%@ page import="net.sf.jasperreports.engine.*" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="java.text.ParseException" %>
<%@ page import="java.io.File" %>
<%@ page import="java.io.FileInputStream" %>
<%@ page import="java.io.FileNotFoundException" %>
<%@ page import="java.io.InputStream" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.SQLException" %>
<%@ page import="java.io.FileOutputStream" %>
<%@ page import="java.io.ByteArrayOutputStream" %>
<%@ page import="java.io.OutputStream" %>
<%@ page import="java.util.HashMap" %>
<%@ page import="java.util.Map" %>
<%@ page import="net.sf.jasperreports.engine.util.*" %> 
<%@ page import="net.sf.jasperreports.engine.export.*" %>
<%@page import = "net.sf.jasperreports.engine.design.JRDesignQuery"%>
<%@page import = "net.sf.jasperreports.engine.xml.JRXmlLoader"%>
<%@page import = "net.sf.jasperreports.engine.design.JasperDesign"%>
<%@page import = "net.sf.jasperreports.view.JasperViewer"%>
<%@page import = "net.sf.jasperreports.engine.JRException"%>
<%@page import = "net.sf.jasperreports.engine.JRResultSetDataSource"%>
<%@page import = "net.sf.jasperreports.engine.JasperCompileManager"%>
<%@page import = "net.sf.jasperreports.engine.JasperExportManager"%>
<%@page import = "net.sf.jasperreports.engine.JasperFillManager"%>
<%@page import = "net.sf.jasperreports.engine.JasperPrint"%>
<%@page import = "net.sf.jasperreports.engine.JasperReport"%>
<%@page import = "net.sf.jasperreports.engine.data.JRCsvDataSource"%>
<%@page import = "net.sf.jasperreports.engine.export.ooxml.JRDocxExporter"%>
<%@page import = "net.sf.jasperreports.engine.export.JRPdfExporter"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
Connection conn = null;
String cate=(String)session.getAttribute("cat");
String stat=(String)session.getAttribute("sta");
String dayy=(String)session.getAttribute("da");
String monthh=(String)session.getAttribute("mon");
String yearr=(String)session.getAttribute("yea");
String dayy1=(String)session.getAttribute("da1");
String monthh1=(String)session.getAttribute("mon1");
String yearr1=(String)session.getAttribute("yea1");
System.out.println("2 is:"+cate);
System.out.println("4 is:"+stat);
System.out.println("5 is:"+dayy);
System.out.println("6 is:"+monthh);
System.out.println("7 is:"+yearr);
System.out.println("8 is:"+dayy1);
System.out.println("9 is:"+monthh1);
System.out.println("10 is:"+yearr1);
try 
{
    Class.forName("com.mysql.jdbc.Driver");
    conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/marketing_database","root","root");
    String sql="select * from lead where Status='" + stat.replaceAll("\'","''") + "'";
           sql+=" AND Category='" + cate.replaceAll("\'","''") + "'";
           sql+=" AND DATE(Lead_Date)>='" + yearr + "-" + monthh + "-" + dayy + "'"; 
           sql+=" AND DATE(Lead_Date)<='" + yearr1 + "-" + monthh1 + "-" + dayy1 + "'";
    String jrxmlFile ="D:/dev/tools/jasper files/report3.jrxml";
    InputStream input = new FileInputStream(new File(jrxmlFile));
    JasperDesign jasperDesign = JRXmlLoader.load(input);

    System.out.println("Compiling Report Designs");
    JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);

    System.out.println("Creating JasperPrint Object");
    HashMap<String,Object> map = new HashMap<String,Object>();
    map.put("sql",sql);
            byte[] bytes = JasperRunManager.runReportToPdf(jasperReport, map, conn);

            response.setContentType("application/pdf");
            response.setContentLength(bytes.length);
            ServletOutputStream outStream = response.getOutputStream();
            outStream.write(bytes, 0, bytes.length);
            outStream.flush();
            outStream.close();
}
catch(Exception e) 
{e.printStackTrace();} 

        %>
</body>
</html>

view.jsp

 <script type="text/javascript">

    function setAction(nPage){

        document.forms[0].action = nPage;
    }
</script>
</head>
<body>
<form>
<%
String category=request.getParameter("category");
session.setAttribute("cat",category);
String status=request.getParameter("status");
session.setAttribute("sta",status);
System.out.println("status is:"+status);
String day=request.getParameter("day");
session.setAttribute("da",day);
String month=request.getParameter("month");
session.setAttribute("mon",month);
String year=request.getParameter("year");
session.setAttribute("yea",year);
String day1=request.getParameter("day1");
session.setAttribute("da1",day1);
String month1=request.getParameter("month1");
session.setAttribute("mon1",month1);
String year1=request.getParameter("year1");
session.setAttribute("yea1",year1);
%>
<select onchange="setAction(this.value)">
<option value=''> Make a selection </option>
<option value='sample1.jsp'> PDF</option>
<option value='XLS_LEAD.jsp'> XLS </option>
<option value='DOC_LEAD.jsp'> DOC </option>
<option value='XLSX_LEAD.jsp'> XLSX </option>
</select>
<br/>

<input type="submit" value="Submit">
</form>
</body>

Answer 1

考虑到您的 view.jsp

我可以看到您已经将所有变量放入会话中，您只是使用表单 select 您需要转到哪个页面。

你可以这样做...

<script type="text/javascript">
 function generateReport() {
  var e = document.getElementById("idOfYourSelectYouNeedToAddedIt");
  var strPage = e.options[e.selectedIndex].value;
  window.open(strPage);
  return false; //This make you stay on this page;
  //return true; //Set the action tag in the form to the page you like to go to!
 }
</script>


 <form name="myForm"  onsubmit="return generateReport()">
      <select id = "idOfYourSelectYouNeedToAddedIt">
      <option value=''> Make a selection </option>
      ..... the other option values
 </form>

请注意，如果您想转到另一个页面，您可以简单地将操作标签添加到您的 form 标签中，并在 generateReport() 函数中添加 return true

例子

 <form name="myForm" action="thisIsWhereILikeToGo.jsp"  onsubmit="return generateReport()">

注意：您应该删除 onchange="setAction(this.value) 代码，它已经没有用了，并考虑检查 strPage 是否为空，没有 selection...

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