We need a separate servlet class to open a report of jasper for each button in report or not?

Mr President.

We need a separate servlet class to open a report of jasper for each button in report or not?

My code for the servlet is as under which works very well for a single report.

package ash.view;


import ash.model.SchoolAppModuleImpl;


import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;


import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;


import java.util.HashMap;
import java.util.Locale;
import java.util.Map;


import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.design.JasperDesign;
import net.sf.jasperreports.engine.xml.JRXmlLoader;


import oracle.jbo.client.Configuration;


@WebServlet(name = "ReportServlet", urlPatterns = { "/reportservlet" })
public class ReportServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=UTF-8";


    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }
    
    protected Connection getConnection() {
        
        PreparedStatement st = null;
        String amDef = "ash.model.SchoolAppModule";
        String config = "SchoolAppModuleLocal";
        SchoolAppModuleImpl am = (SchoolAppModuleImpl ) Configuration.createRootApplicationModule(amDef, config);
        
        st = am.getDBTransaction().createPreparedStatement("select 1 from dual", 0);
        Connection conn = null;    
    
        try {
            conn = st.getConnection();
            return conn;
        } catch (SQLException e) {
        }   
    
        return null;
    }


    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String var0 = "";
        try {
            var0 = request.getParameter("classId");
        } catch (Exception e) {
            e.printStackTrace();
        }
        response.setContentType(CONTENT_TYPE);
        Map parameters = new HashMap();
               parameters.put("format", "pdf");
               parameters.put("WEBDIR", getServletContext().getRealPath("/"));
               parameters.put("REPORT_LOCALE", new Locale("ar"));
        
        
               parameters.put("classId", new String(var0));
               Connection conn = null;
               InputStream is = null;
               try
               {
                 conn = getConnection();
                 is = getServletContext().getResourceAsStream("/WEB-INF/reports/ClassDataReport.jrxml");
        
        
                 response.setContentType("application/pdf");
                 response.addHeader("Content-Disposition", "attachment; filename=ClassDataReport.pdf");
                  
                 JasperDesign jasperDesign = JRXmlLoader.load(is);
                 JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
                 JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);                    
                 JasperExportManager.exportReportToPdfStream(jasperPrint, response.getOutputStream());
                          
                 conn.close();
               }
               catch (Exception e) {
                 e.printStackTrace();
               } finally {
                 closeConnection(conn);
                 try {
                     if(is !=null){
                         is.close();
                     }                   
                    
                 } catch (Exception localException1)
                 {
                 }
               }
        
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head><title>ReportServlet</title></head>");
        out.println("<body>");
        out.println("<p>The servlet has received a GET. This is the reply.</p>");
        out.println("</body></html>");
        out.close();
    }
    
    protected static void closeConnection(Connection conn) {
        try {
            if(conn !=null){
                conn.close();
            }           
        } catch (Exception ex) {
            //  System.out.println("Developer Msg : Exception in printReport1Servlet.closeConnection()");
        }
    }
}

Concerning

It will be something like this:

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          String var0 = "";
          String reportName = "";
          try {
              reportName = request.getParameter("reportName");
          } catch (Exception e) {
              e.printStackTrace();
          }
          response.setContentType(CONTENT_TYPE);
          Map parameters = new HashMap();
                 parameters.put("format", "pdf");
                 parameters.put("WEBDIR", getServletContext().getRealPath("/"));
                 parameters.put("REPORT_LOCALE", new Locale("ar"));

                 if(reportName.equals("report1"))
                 {
                   var0 = request.getParameter("classId");
                   parameters.put("classId", new String(var0));
                 }

                 if(reportName.equals("report2"))
                 {
                   Object value1 = request.getParameter("value1");
                   Object value2= request.getParameter("value2");
                   parameters.put("p1", value1);
                   parameters.put("p2", value2);
                 }

                 Connection conn = null;
                 InputStream is = null;
                 try
                 {
                   conn = getConnection();
                   is = getServletContext().getResourceAsStream("/WEB-INF/reports/"+reportName+".jrxml");

                   response.setContentType("application/pdf");
                   response.addHeader("Content-Disposition", "attachment; filename="+reportName+".pdf");

                   JasperDesign jasperDesign = JRXmlLoader.load(is);
                   JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
                   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);
                   JasperExportManager.exportReportToPdfStream(jasperPrint, response.getOutputStream());

                   conn.close();
                 }
                 catch (Exception e) {
                   e.printStackTrace();
                 } finally {
                   closeConnection(conn);
                   try {
                       if(is !=null){
                           is.close();
                       }                   

                   } catch (Exception localException1)
                   {
                   }
                 }

          PrintWriter out = response.getWriter();
          out.println("");
          out.println("ReportServlet");
          out.println("");
          out.println("
The servlet has received a GET. This is the reply.
");
          out.println("");
          out.close();
      }

And the button that will call the report should be something like this;

Tags: Java

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