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Wie kann ich jsp mit mysql verbunden werden. Wo liege ich falsch? Meine index.jsp-Seite funktioniert ordnungsgemäß. Aber ich zweifle an <% @ include file = "DB conn"%> was soll in Form Aktion geschrieben werden und meine DB conn.jsp Datei hat einen echten Fehler.Wie kann ich mit Mysql-Datenbank mit JSP verbunden werden? wo liege ich falsch in meinem Code?
Wie kann ich Fehler von diesem Code mit jsp.What Fehler darin entfernen? Ihr Vorschlag ist wichtig für mich, danke.
db conn.jsp
<%@page import="com.mysql.jdbc.Connection"%>
<%@page import="com.mysql.jdbc.Statement"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<%@ page import ="java.sql.*" %>
<%
Connection c1 = null;
Statement st = null;
ResultSet rs = null;
Class.forName("com.mysql.jdbc.Driver");
c1 = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/teacher","root", "abcde");
{
System.out.println("Couldn't find the driver!");
System.out.println("Couldn't connect: print out a stack trace and exit.");
System.out.println("We got an exception while creating a statement:" + "that probably means we're no longer connected.");
st = (Statement) c1.createStatement();
System.out.println("Statement Created Successfully");
{
System.out.println("We got an exception while creating a statement:" + "that probably means we're no longer connected.");
se.printStackTrace();} //Stack Trace Added
if (c1!= null) {
System. out.println("Hooray! We connected to the database!");
} else {
System.out.println("We should never get here.");
}}
%>
<%
try{
String name=request.getParameter("username");
String abc=request.getParameter("password");
String Sql="select * from login where username='"+name+"' AND password='"+abc+"'";
ResultSet rs=c1.st.executeQuery(Sql); //error line
while(rs.next()) {
out.println("aa");}
catch(SQLException ex)
{
out.println(ex);
}
%>
index.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<%@include file="db conn.jsp" %>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form method="GET " action="reg.jsp" autocomplete="on">
<h1>Log in</h1>
<p>
<label for="username" class="uname" data-icon="u" >Username:</label>
<input id="username" name="username" required="required" type="text" placeholder="Username"/>
</p>
<p>
<label for="password" class="youpasswd" data-icon="p">Password:</label>
<input id="password" name="password" required="required" type="password" placeholder="Password" />
</p>
<p class="keeplogin">
<input type="checkbox" name="loginkeeping" id="loginkeeping" value="loginkeeping" />
<label for="loginkeeping">Keep me logged in</label>
</p>
<p class="login button">
<input type="submit" value="Login" />
<input type="button" onclick="location.href='reg.jsp';" value="Sign Up"/>
</p>
<input type="radio" name="gender" value="Teach" checked/> Teacher
<input type="radio" name="gender" value="Student"/>Student
</form>
</body>
</html>
Fehler
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: Exception in JSP: /db conn.jsp:62
62: while(rs.next()) {}
Zeigen Sie den Stacktrace. – csmckelvey
'se.printStackTrace();' Sie können es in Code meine Abwärtsbewegung –
Zeigen Sie die ** Ausgabe ** des StackTrace. Du weißt, der Text, den er auf deine Konsole gedruckt hat. – csmckelvey