É os eguinte galera…
faiz uma jsp pra conectar no bd e mostrar os dados:
<%@page import="java.sql.*"%>
<%
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try{
Class c = Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){
System.out.println("naum carregou o driver");
}
try{
conn = DriverManager.getConnection("jdbc:odbc:teste");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from clientes");
}
catch(SQLException e){
System.out.println("erro de sql");
}
%>
<html>
<head>
</head>
<body>
<table>
<%while (rs.next()){%>
<tr>
<th>
<%=rs.getString("nome")%>
</th>
<th>
<%=rs.getString("cidade")%>
</th>
</tr>
<%}%>
</table>
</body>
</html>
veja o servlet gerado por ela:
package org.apache.jsp;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.sql.*;
public final class recebe_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent {
private static java.util.Vector _jspx_dependants;
public java.util.List getDependants() {
return _jspx_dependants;
}
public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException {
JspFactory _jspxFactory = null;
PageContext pageContext = null;
HttpSession session = null;
ServletContext application = null;
ServletConfig config = null;
JspWriter out = null;
Object page = this;
JspWriter _jspx_out = null;
PageContext _jspx_page_context = null;
try {
_jspxFactory = JspFactory.getDefaultFactory();
response.setContentType("text/html");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
out.write('\r');
out.write('\n');
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try{
Class c = Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){
System.out.println("naum carregou o driver");
}
try{
conn = DriverManager.getConnection("jdbc:odbc:teste");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from clientes");
}
catch(SQLException e){
System.out.println("erro de sql");
}
out.write("\r\n");
out.write("<html>\r\n");
out.write("<head>\r\n");
out.write("</head>\r\n");
out.write("<body>\r\n");
out.write("<P>\r\n");
out.print(request.getParameter("txtNome"));
out.write('\r');
out.write('\n');
out.print(request.getParameter("txtCidade"));
out.write('\r');
out.write('\n');
out.print(request.getParameter("txtTelefone"));
out.write("</P>\r\n");
out.write("\r\n");
out.write("<table>\r\n");
while (rs.next()){
out.write("\r\n");
out.write("<tr>\r\n");
out.write("\t\r\n");
out.write("</tr>\r\n");
}
out.write("\r\n");
out.write("</table>\r\n");
out.write("\r\n");
out.write("</body>\r\n");
out.write("</html>\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
out.write("\r\n");
} catch (Throwable t) {
if (!(t instanceof SkipPageException)){
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
out.clearBuffer();
if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
}
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
}
}
}
ta danu este erro:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NullPointerException
org.apache.jsp.recebe_jsp._jspService(org.apache.jsp.recebe_jsp:82)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.
Apache Tomcat/5.5.9
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