Java类中的SQL Server连接问题

SQL server在Java应用程序上运行，而不是WEB应用程序（SERVLET）NETBEANS。问题是什么？

我正在学习WEB编程课程，在这个项目中，我遇到了很多错误。其中一个相当令人印象深刻的错误正在讨论中1.我找到了问题的解决办法

对于在Netbeans中创建的Java应用程序，此代码运行良好，不会在Web应用程序Java类中运行：

import java.sql.*;

/**

*

* @author HafizAhmad

*/

public class SQLConnection {

/**

* @param args the command line arguments

*/

public static void main(String[] args) {

// TODO code application logic here

Connection conn = null;

try {

String dbURL = "jdbc:sqlserver://localhost:1433;databaseName=Flight_Management";

String user = "TestingUser";

String pass = "4546";

conn = DriverManager.getConnection(dbURL,user,pass);

if (conn != null) {

DatabaseMetaData dm = (DatabaseMetaData) conn.getMetaData();

System.out.println("Driver name: " + dm.getDriverName());

System.out.println("Driver version: " + dm.getDriverVersion());

System.out.println("Product name: " + dm.getDatabaseProductName());

System.out.println("Product version: " + dm.getDatabaseProductVersion());

}

} catch (SQLException ex) {

ex.printStackTrace();

} finally {

try {

if (conn != null && !conn.isClosed()) {

conn.close();

}

} catch (SQLException ex) {

ex.printStackTrace();

}

}

}

}

但在Web应用程序中，我首先在源代码包中创建java类，并将代码更改为：

import java.sql.Connection;

import java.sql.DatabaseMetaData;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.util.logging.Level;

import java.util.logging.Logger;

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

/**

*

* @author HafizAhmad

*/

public class database {

database(){

Connection conn = null;

try {

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

String dbURL = "jdbc:sqlserver://localhost:1433;databaseName=Flight_Management";

String user = "TestingUser";

String pass = "4546";

conn = DriverManager.getConnection(dbURL,user,pass);

if (conn != null) {

DatabaseMetaData dm = (DatabaseMetaData) conn.getMetaData();

System.out.println("Driver name: " + dm.getDriverName());

System.out.println("Driver version: " + dm.getDriverVersion());

System.out.println("Product name: " + dm.getDatabaseProductName());

System.out.println("Product version: " + dm.getDatabaseProductVersion());

}

} catch (SQLException ex) {

ex.printStackTrace();

} catch (ClassNotFoundException ex) {

Logger.getLogger(page.class.getName()).log(Level.SEVERE, null, ex);

} finally {

try {

if (conn != null && !conn.isClosed()) {

conn.close();

}

} catch (SQLException ex) {

ex.printStackTrace();

}

}

}

}

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您不需要创建答案。您可以在问题本身中包含代码。