Display Excel sheet in the Browser?
11,778
Solution 1
The way you are trying to do it doesn't make any sense. You can't mix HTML with Excel like that. Better create a servlet instead of a JSP page and let this servlet output only the Excel file and nothing else.
Something like this:
import java.io.*;
import javax.servlet.http.*;
import javax.servlet.*;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
// ... plus all the other libs you need
public class ExcelServlet extends HttpServlet {
public void doGet (HttpServletRequest req,
HttpServletResponse res)
throws ServletException, IOException
{
HSSFWorkbook book;
// ...
// fill the book
// ...
res.setContentType("application/vnd.ms-excel");
book.write(res.getOutputStream());
res.getOutputStream().close();
}
}
Solution 2
HSSFWorkbook book;
HSSFSheet sheet;
HSSFRow row;
CreationHelper createHelper = book.getCreationHelper();
You are using the book object before initializing it.
Solution 3
I'd recommend not doing it this way.
Scriptlet code in JSPs is simply wrong.
Putting database access in a page like this isn't good, either.
A better approach would be Spring MVC and its JExcelView.
Author by
Venkat
Self-driven developer with a passion for clean code principles.
Updated on June 10, 2022Comments
-
Venkat about 2 years
I need to display the newly generated excel (from tables using Apache POI) in a web browser (whatever it is, Firefox, Opera or IE). I've created the JSP file with
contentType="application/vnd.ms-excel"But I'm not getting it.
Here's my code snippet :
<%@page session="true" contentType="application/vnd.ms-excel" pageEncoding="UTF-8"%> <%@page import="org.apache.poi.ss.usermodel.CellStyle"%> <%@page import="java.sql.DriverManager"%> <%@page import="java.sql.ResultSet"%> <%@page import="java.sql.Statement"%> <%@page import="java.sql.Connection"%> <%@page import="org.apache.poi.ss.usermodel.CreationHelper"%> <%@page import="org.apache.poi.hssf.usermodel.HSSFCell"%> <%@page import="org.apache.poi.hssf.usermodel.HSSFRow"%> <%@page import="org.apache.poi.hssf.usermodel.HSSFWorkbook"%> <%@page import="org.apache.poi.hssf.usermodel.HSSFSheet"%> <html> <head> <%! int r=0; HSSFWorkbook book; HSSFSheet sheet; HSSFRow row; CreationHelper createHelper = book.getCreationHelper(); Connection conn; Statement stmt; ResultSet rs; %> <title>Report</title> <% book = new HSSFWorkbook(); sheet = book.createSheet("Report"); %> </head> <body> <% try { // Header of the Excel File row = sheet.createRow(r); row.createCell(0).setCellValue("Visit ID"); row.createCell(1).setCellValue("Carrier Name"); row.createCell(2).setCellValue("Phone Number"); row.createCell(3).setCellValue("Patient Name"); row.createCell(4).setCellValue("Subscriber ID"); row.createCell(5).setCellValue("Subscriber Name"); row.createCell(6).setCellValue("Chart Number"); row.createCell(7).setCellValue("Date Of Birth"); row.createCell(8).setCellValue("Subscriber Employer"); row.createCell(9).setCellValue("Service Date"); row.createCell(10).setCellValue("Provider Name"); row.createCell(11).setCellValue("CPT Code"); row.createCell(12).setCellValue("Aging Date"); row.createCell(13).setCellValue("Total"); row.createCell(14).setCellValue("Follow Up Notes"); row.createCell(15).setCellValue("Internal Status Code"); CellStyle cellStyle = book.createCellStyle(); cellStyle.setDataFormat(createHelper.createDataFormat().getFormat("MM/dd/yyyy")); Statement stNotes; ResultSet rsNotes; Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/maintain", "root", "root"); stmt = conn.createStatement(); stNotes = conn.createStatement(); rs = stmt.executeQuery("SELECT b.VisitID, b.CarrierName, b.PhoneNum, b.PatientName, " + "b.SubscriberID, b.SubscriberName, b.ChartNum, b.DoB, b.SubscriberEmp, " + "b.ServiceDate, b.ProviderName, b.CPTCode, b.BillingDate, b.BalanceAmt " + "FROM billing b INNER JOIN followup f ON b.VisitID = f.VisitID GROUP BY VisitID"); while(rs.next()) { r++; row = sheet.createRow(r); row.createCell(0).setCellValue(rs.getString("VisitID")); row.createCell(1).setCellValue(rs.getString("CarrierName")); row.createCell(2).setCellValue(rs.getString("PhoneNum")); row.createCell(3).setCellValue(rs.getString("PatientName")); row.createCell(4).setCellValue(rs.getString("SubscriberID")); row.createCell(5).setCellValue(rs.getString("SubscriberName")); row.createCell(6).setCellValue(rs.getString("ChartNum")); row.createCell(7).setCellValue(rs.getString("DoB")); row.createCell(8).setCellValue(rs.getString("SubscriberEmp")); row.createCell(9).setCellValue(rs.getString("ServiceDate")); row.createCell(9).setCellStyle(cellStyle); row.createCell(10).setCellValue(rs.getString("ProviderName")); row.createCell(11).setCellValue(rs.getString("CPTCode")); row.createCell(12).setCellValue(rs.getString("BillingDate")); row.createCell(12).setCellStyle(cellStyle); row.createCell(13).setCellValue(rs.getString("BalanceAmt")); rsNotes = stNotes.executeQuery("SELECT Date, InternalStatusCode, FollowUpNote " + "FROM followup WHERE VisitID='" + rs.getString("VisitID") + "' ORDER BY Date"); while(rsNotes.next()) { row.createCell(14).setCellValue(rsNotes.getString("Date") + " - " + rsNotes.getString("FollowUpNote")); row.createCell(15).setCellValue(rs.getString("VisitID")); } } } catch(ClassNotFoundException cnf) { out.print("<br> Error : MySQL Driver not found. <br>"); } catch(Exception ex) { out.print("Error : <br>" + ex); } %> </body> </html>I'm getting this exception with Tomcat 6.0.26 :
exception org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:156) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) root cause java.lang.NullPointerException org.apache.jsp.GetReport_jsp.<init>(GetReport_jsp.java:29) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) java.lang.reflect.Constructor.newInstance(Constructor.java:513) java.lang.Class.newInstance0(Class.java:355) java.lang.Class.newInstance(Class.java:308) org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)Did I miss something or anything wrong? Can anybody help me to get rid of this problem?
Thanx in advance.