Question

当我尝试运行转发到连接到数据库的jsps的索引时，我在jsps上收到错误，数据库名称和一切都很好。

它给我的错误是 HTTP状态500 - 内部服务器错误 org.apache.jasper.JasperException：在第[25]行处理[/registration.jsp]时发生异常

22：//它返回com.mysql.jdbc.Driver.class。 23： 24：
25：java.sql.Connection conn = DriverManager.getConnection（“jdbc：mysql：// localhost：3306 / employeeexample”，“root”，“1234”）; 26：语句stmt = conn.createStatement（）; 27：
28：// stmt.executeUpdate（“插入users2（user_id，密码，fname，lname，email）”+“values”+“（”+ user +“'，'”+ pwd +“'，'”+ fname +“' ' “+ L-NAME +”，' “+电子邮件+”'）“）;

它给我带来了LOGIN.JSP上的相同错误，但是它提供了直接与连接相对应的行号。

的login.jsp

SELECT TOP 1 ID, HoursWorked FROM HoursWorked ORDER BY HoursWorked DESC

REGISTRATION.JSP

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration.jsp</title>
</head>
<body>
<%@ page import ="java.sql.*" %>
<%@ page import ="javax.sql.*" %>

<%
String user = request.getParameter("user");
//session.putValue("userid",user);
String pwd = request.getParameter("pwd");
String fname = request.getParameter("fname");
String lname = request.getParameter("lname");
String email= request.getParameter("email");

Class.forName("com.mysql.jdbc.Driver");
//it returns com.mysql.jdbc.Driver.class. 

 
   java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/employeeexample", "root","1234");
   Statement stmt = conn.createStatement();
  
  // stmt.executeUpdate("insert into users2(user_id,password,fname,lname,email)" +"values"+"("+user+"','"+pwd+ "','"+fname+"','"+lname+",'"+email+"')");
   stmt.executeUpdate
   ("insert into users2 values"+"('"+user+"','"+pwd+"','"+fname+"','"+lname+"','"+email+"')");
// stmt.executeUpdate("insert into users2(user_id,password) " + "values  ('"+user+"','"+pwd+"')");
  
   
  //stmt.executeUpdate("insert into users values("+pwd+ "','"+fname+"','"+lname+",'"+email+"')");
	ResultSet rs = stmt.executeQuery  ("SELECT * FROM users2 WHERE user_id ='"+ user + "'");
   
	
if(rs.next())
{
	
		out.println("welcome "+user);
	
}
   out.println(user+ " Registered");
  
%>

<a href = "Login.html"> Login</a>

<a href = "Registration.html"> Registration</a>
</body>
</html>

Answer 1

尝试捕获可能有助于了解问题所在：

<%
String user = request.getParameter("user");
//session.putValue("userid",user);
String pwd = request.getParameter("pwd");
String fname = request.getParameter("fname");
String lname = request.getParameter("lname");
String email= request.getParameter("email");

    try {
       Class.forName("com.mysql.jdbc.Driver");

       java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/employeeexample", "root","1234");

       Statement stmt = conn.createStatement();

       // stmt.executeUpdate("insert into users2(user_id,password,fname,lname,email)" +"values"+"("+user+"','"+pwd+ "','"+fname+"','"+lname+",'"+email+"')");
       stmt.executeUpdate
       ("insert into users2 values"+"('"+user+"','"+pwd+"','"+fname+"','"+lname+"','"+email+"')");
       // stmt.executeUpdate("insert into users2(user_id,password) " + "values  ('"+user+"','"+pwd+"')");


       //stmt.executeUpdate("insert into users values("+pwd+ "','"+fname+"','"+lname+",'"+email+"')");
        ResultSet rs = stmt.executeQuery  ("SELECT * FROM users2 WHERE user_id ='"+ user + "'");


        if(rs.next())
        {

                out.println("welcome "+user);

        }
        out.println(user+ " Registered");
    } catch (ClassNotFoundException | SQLException e) {
        e.printStackTrace();
    }

%>

连接到数据库失败，HTTP状态500

1 个答案: