当我尝试运行此程序时，出现此异常。这是微软的例子之一。我已经通过项目属性将sqljdbc4.jar添加到了netbeans的类路径中，以便进行编译和运行。我还测试了可以使用下面的import语句找到该类-编译期间没有错误，因此它必须找到jar。

可能与sqldbc4.jar引用的dll或某些sql dll相关吗？

这是确切的例外，下面是确切的代码(密码除外)。

例外：

run:

java.sql.SQLException: No suitable driver found for jdbc:microsoft:sqlserver://localhost:1433;databaseName=HealthCareDatabase

Error Trace in getConnection() : No suitable driver found for jdbc:microsoft:sqlserver://localhost:1433;databaseName=HealthCareDatabase

Error: No active Connection

at java.sql.DriverManager.getConnection(DriverManager.java:602)

at java.sql.DriverManager.getConnection(DriverManager.java:185)

at javaapplication1.Connect.getConnection(Connect.java:35)

at javaapplication1.Connect.displayDbProperties(Connect.java:50)

at javaapplication1.JavaApplication1.main(JavaApplication1.java:23)

BUILD SUCCESSFUL (total time: 1 second)

码：

package javaapplication1;

import com.microsoft.sqlserver.jdbc.SQLServerDriver;

import java.*;

public class Connect {

private java.sql.Connection con = null;

private final String url = "jdbc:microsoft:sqlserver://";

private final String serverName = "localhost";

private final String portNumber = "1433";

private final String databaseName = "HealthCareDatabase";

private final String userName = "larry";

private final String password = "xxxxxxx";

// Constructor

public Connect() {

}

private String getConnectionUrl() {

return url + serverName + ":" + portNumber + ";databaseName=" + databaseName ;

}

private java.sql.Connection getConnection() {

try {

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

con = java.sql.DriverManager.getConnection(getConnectionUrl(), userName, password);

if (con != null) {

System.out.println("Connection Successful!");

}

} catch (Exception e) {

e.printStackTrace();

System.out.println("Error Trace in getConnection() : " + e.getMessage());

}

return con;

}

public void displayDbProperties() {

java.sql.DatabaseMetaData dm = null;

java.sql.ResultSet rs = null;

try {

con = this.getConnection();

if (con != null) {

dm = con.getMetaData();

System.out.println("Driver Information");

System.out.println("\tDriver Name: " + dm.getDriverName());

System.out.println("\tDriver Version: " + dm.getDriverVersion());

System.out.println("\nDatabase Information ");

System.out.println("\tDatabase Name: " + dm.getDatabaseProductName());

System.out.println("\tDatabase Version: " + dm.getDatabaseProductVersion());

System.out.println("Avalilable Catalogs ");

rs = dm.getCatalogs();

while (rs.next()) {

System.out.println("\tcatalog: " + rs.getString(1));

}

rs.close();

rs = null;

closeConnection();

} else {

System.out.println("Error: No active Connection");

}

} catch (Exception e) {

e.printStackTrace();

}

dm = null;

}

private void closeConnection() {

try {

if (con != null) {

con.close();

}

con = null;

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) throws Exception {

Connect myDbTest = new Connect();

myDbTest.displayDbProperties();

}

}