import java.sql.Connection;
import java.sql.DriverManager;

public class Test {

public static void main(String[] args) {

    try {
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        System.out.println("加载驱动成功");
        String url ="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=CYWL";
        String username ="sa";
        String password ="1234";
        Connection conn = DriverManager.getConnection(url,username,password);
        System.out.println("连接数据库成功");
        conn.close();
    } catch (Exception e) {
        e.printStackTrace();
        System.out.print("连接失败");
    }
}

}

=======================================================
加载驱动成功
com.microsoft.sqlserver.jdbc.SQLServerException: 用户 'sa' 登录失败。
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:196)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:246)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:83)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:2532)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:1929)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$000(SQLServerConnection.java:41)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:1917)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:4026)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1416)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1061)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:833)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:716)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:841)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
at Test.main(Test.java:14)
连接失败