java怎么连数据库找不到主类_为什么java连接SQL时显示错误: 找不到或无法加载主类？...

package学生信息管理系统;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;/***数据库链接测试*@authorDimple**/publicclass连接{Connectionco...

package 学生信息管理系统;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

/**

* 数据库链接测试

* @author Dimple

*

*/

public class 连接 {

Connection connection;

static {

try {

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

System.out.println("数据库加载成功！");

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

Connection getConn(){

String url="jdbc:sqlserver://localhost:1433;DatabaseName=sstudent";

String userName="sa";

String passWord="123456";

try {

connection=DriverManager.getConnection(url,userName,passWord);

if (connection!=null) {

System.out.println("链接成功！");

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return connection;

}

public static void main(String[] args) {

Test test=new Test();

Connection con=test.getConn();

try {

System.out.println(con.getCatalog());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

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