Impressao flex

<mx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.managers.PopUpManager;
			
			public function gerar():void{
				var dtIni:String;
				var dtFin:String;
				
				dtIni = dataInicial.text;
				dtFin = dataFinal.text;			
			        var request:URLRequest = new URLRequest("http://localhost:8080/Projeto/ServletRelatorio?relatorio=osData&       dataInicial="+dtIni+"dataFinal="+dtFin"); 
					navigateToURL(request, "_blank");
					PopUpManager.removePopUp(this);
			   }
			}
		]]>
	</mx:Script>

package servlet;

import java.io.IOException;
import java.sql.Connection;
import java.util.Date;
import java.util.HashMap;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperRunManager;
import util.ConexaoFactory;

/**
 * Servlet implementation class for Servlet: geraRelatorio
 * 
 */
public class ServletRelatorio extends HttpServlet {

	static final long serialVersionUID = 1L;
	@SuppressWarnings("unused")
	private static String caminhoJava;
	
     //Para abrir a conexão com o banco é necessario emprementar uma classe no java só para fazer a requesição de abrir as sessões com banco.
	private Connection conexao;

	public ServletRelatorio() {
		conexao = ConexaoFactory.getConnection();
	}

	@SuppressWarnings("unchecked")
	public void doGet(HttpServletRequest request, HttpServletResponse response) {

		caminhoJava = this.getServletContext().getRealPath("WEB-INF/classes");
		
                // o getParameter é responsavel por recuperar os parametros passado pela url.
		String relatorio = request.getParameter("relatorio");

                // compara se o relatorio é do gerar Os Por data.
		if(relatorio.equals("osData")){
			try {
				relatorioOsPorData(request, response);
			} catch (JRException e) {
				e.printStackTrace();
			}
		}
	}
	
	

	/**
	 * metodo que gera relatorio de ordem de servico por data
	 * @param request
	 * @param response
	 * @throws JRException 
	 */
	@SuppressWarnings("unchecked")
	private void relatorioOsPorData(HttpServletRequest request, HttpServletResponse response) throws JRException {
		HashMap parametro = new HashMap();
		
		@SuppressWarnings("unused")
		Date dataInicial, dataFinal = null;
		String relatorio = caminhoJava + "\\relatorio/osData.jasper";
		
		String dtInicial = request.getParameter("dataInicial");
		String dtFinal = request.getParameter("dataFinal");
		
                //É necessario emprementar uma classe para formatação das data para [Date]
		dataInicial = util.Funcoes.FormataData(dtInicial);
		dataFinal = util.Funcoes.FormataData(dtFinal);
		
		parametro.put("dataInicial", dataInicial);
		parametro.put("dataFinal", dataFinal);
		
		byte[] pdf = JasperRunManager.runReportToPdf(relatorio, parametro, conexao);
		this.exibirRelatorio(pdf, response);
	}

	/** metodo que exibe os relatorios* */
	public void exibirRelatorio(byte[] relatorio, HttpServletResponse response) {
			ServletOutputStream out = null;
			response.setContentType("application/pdf");
			try {
				out = response.getOutputStream();
				out.write(relatorio);
			} catch (IOException e) {
				e.printStackTrace();
			}	
	}
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConexaoFactory {
	
	public ConexaoFactory(){
		init();
	}
	
	static Connection con = null;
	
	public void init(){
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			System.out.println("Ocorreu erro ao carregar o driver!" + e.getMessage());
		}
	}
	
	public static Connection getConnection(){
		try {
		  if((con == null)||(con.isClosed())){
			con = DriverManager.getConnection("jdbc:mysql://localhost/projeto","root","");
			System.out.println("Conexão obtida com sucesso!");
		  }

		} catch (SQLException e) {
			System.out.println("SQLException"+e.getMessage());
		}catch (Exception e) {
			System.out.println("SQLException"+e.getMessage());
		}
		return con;
	}
	
	public void closeConnection(){
		try {
			if((con == null)&&(!con.isClosed())){
				con.close();
				System.out.println("Conexão encerrada!");
			}
		} catch (Exception e) {
			System.out.println("SQLException"+e.getMessage());
		}
	}
}

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Funcoes {

	/** metodo que transforma string para date * */
	public static Date FormataData(String data) {

		Date dataF = null;
		try {

			SimpleDateFormat formato = new SimpleDateFormat("dd/MM/yyyy");
			dataF = (java.util.Date) formato.parse(data);

		} catch (ParseException e) {
			e.printStackTrace();
		}
		return dataF;
	}
}

HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Error instantiating servlet class servlet.ServletRelatorio
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	java.lang.Thread.run(Unknown Source)


root cause 

java.lang.NoClassDefFoundError: net/sf/jasperreports/engine/JRException
	java.lang.Class.getDeclaredConstructors0(Native Method)
	java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
	java.lang.Class.getConstructor0(Unknown Source)
	java.lang.Class.newInstance0(Unknown Source)
	java.lang.Class.newInstance(Unknown Source)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	java.lang.Thread.run(Unknown Source)


root cause 

java.lang.ClassNotFoundException: net.sf.jasperreports.engine.JRException
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
	java.lang.Class.getDeclaredConstructors0(Native Method)
	java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
	java.lang.Class.getConstructor0(Unknown Source)
	java.lang.Class.newInstance0(Unknown Source)
	java.lang.Class.newInstance(Unknown Source)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	java.lang.Thread.run(Unknown Source)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.29 logs.


--------------------------------------------------------------------------------

Apache Tomcat/6.0.29