//SourceCode1
package SqlTest;
import java.awt.dnd.DnDConstants;
import java.sql.*;
import java.util.function.DoubleConsumer;

public class ConectTest {

 public static void main(String [] args)
{
  String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
  String dbURL="jdbc:sqlserver://localhost:1433;DatabaseName=SPJ";
  String userName="sa";
  String userPwd="zhao1234";
//  Statement stmt=null;
  PreparedStatement pstmt = null;
  ResultSet rs=null;
  Connection dbCon=null;

 try
{
    Class.forName(driverName);
    System.out.println("加载驱动成功！");
}catch(Exception e){
    e.printStackTrace();
    System.out.println("加载驱动失败！");
}

 
try{
      dbCon=DriverManager.getConnection(dbURL,userName,userPwd);
        System.out.println("连接数据库成功！");
}catch(Exception e)
{
    e.printStackTrace();
    System.out.print("SQL Server连接失败！");
}

//SourceCode2
package Shopping;
import java.sql.*;
public class Conn {
    public static Connection getSqlConnect() {
        Connection Con = null;
        String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        String dbURL = "jdbc:sqlserver://localhost:1433;DatabaseName=SPJ";
        String userName = "sa";
        String userPwd = "zhao1234";
        try {
            Class.forName(driverName);
            System.out.println("加载驱动成功！");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("加载驱动失败！");
        }

        try {
            Con = DriverManager.getConnection(dbURL, userName, userPwd);
            System.out.println("连接数据库成功！");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.print("SQL Server连接失败！");
        }
        return Con;
    }

    // 测试数据库连接
    public static void main(String[] args) {
        Conn aConn=new Conn();
        aConn.getSqlConnect();
    }
}
同样的配置和运行环境，两个文件，第一个连接通过，第二个就显示失败，是代码的问题吗？我不是很了解java。或者是其他的什么问题吗？各位大佬，帮忙看下好吗？谢谢大家了!

java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
加载驱动失败！
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
    at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Unknown Source)
    at Shopping.Conn.getSqlConnect(Conn.java:13)
    at Shopping.Conn.main(Conn.java:33)
java.sql.SQLException: No suitable driver found for jdbc:sqlserver://localhost:1433;DatabaseName=SPJ
    at java.sql/java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql/java.sql.DriverManager.getConnection(Unknown Source)
    at Shopping.Conn.getSqlConnect(Conn.java:21)
    at Shopping.Conn.main(Conn.java:33)
SQL Server连接失败！
就是这样，但是另一个完全通过。两个配置是完全一样的。

谢谢你啊，我看了下，是忘了导入jar包了，这个问题解决了

[此贴子已经被作者于2019-6-14 00:55编辑过]