如何将jsp连接到mysql。我哪里错了？我的index.jsp页面工作正常。但我怀疑<%@include file="DB conn"%>应该以表单操作编写什么，而我的DB conn.jsp文件有真正的错误。
如何使用jsp从代码中删除错误。里面的错误是什么？你的建议对我来说很重要，谢谢。
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>
错误
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()) {}
你能在db-conn.jsp中包含try-and-catch块吗？它可能会解决你的问题。