传递变量参数时出错

Question

我有一个界面

    import javax.naming.AuthenticationException;

    import com.unboundid.ldap.sdk.LDAPException;


    public interface AuthenticationServiceManager {

/**
 * Creates the Connection for the specific user logging in, and binds the
 * user's credentials to  object.
 * 
 * @param userName
 *            The user name to authenticate .
 * @param password
 *            The user's password to check .
 * @param args
 *            is an object that holds variable arguments which can be used
 *            to authenticate using both LDAP and OpenId
 * @return boolean The connection status showing whether the user has been
 *         successfully authenticated or not.
 * @throws AuthenticationException
 *             If there is an error authenticating with the passed
 *             parameters
 **/

boolean authenticate(String username, String password, Object... args)
        throws AuthenticationException, LDAPException;

/**
 * Disconnects the connection.
 */
void disconnect();

}

实现该接口的类

    package com.cerner.jira.plugins.esig.servicemanagerimpl;

   import javax.naming.AuthenticationException;

    import com.cerner.jira.plugins.esig.servicemanager.AuthenticationServiceManager;
   import com.unboundid.ldap.sdk.LDAPException;

    public class AuthenticationManagerImpl implements AuthenticationServiceManager {

@Override
public boolean authenticate(String username, String password)
        throws AuthenticationException, LDAPException {

    return false;
}

@Override
public boolean authenticate(String username, String password, String url)
{
    return false;


}

@Override
public void disconnect() {
    // TODO Auto-generated method stub

}

}

我正在尝试创建一个可用于实现连接类的接口。我应该能够将它用于不同的身份验证，如 LDAP、OpenId 等；所以我想传递用户名、密码（如果是 LDAP）和可变数量的参数（如果是 OpenId）。我怎么做？我试过这个。它正在抛出错误。如何初始化对象以保存可变参数？

错误：AuthenticationManagerImpl 类型的方法 authenticate(String, String) 必须重写或实现超类型方法

Answer 1

几种可能性。

一种是重载接口中的方法，通过使用不同的参数集多次声明方法。

另一种是将参数列为可变长度数据结构，例如数组。命令行界面使用public static void main(String[] args) 执行此操作，您可以传递多个命令行参数。你可以这样做：

boolean authenticate(String username, String password, Object[] args)
    throws AuthenticationException, LDAPException;

Answer 2

@Override
public boolean authenticate(String username, String password)
        throws AuthenticationException, LDAPException {

    return false;
}

@Override
public boolean authenticate(String username, String password, String url) {
    return false;
}

AuthenticationServiceManagerinterface 中没有接收 String, String 参数或 String, String, String 参数的方法。相反，您有一个接收可变参数的authenticate 方法，因此，在实现AuthenticationServiceManager 接口的类中，您应该将方法实现为：

@Override
public boolean authenticate(String username, String password, Object ... args) {
    //handle args as you want/need
    //if you don't need it for this specific case, then do nothing with the variable
    //and yes, it is an ugly design =\
    return false;
}

---

另一个设计选项是使用AuthenticationServiceManager 接口与boolean authenticate(String username, String password) 方法和其他方法，您可以根据需要添加更多参数：

public interface AuthenticationServiceManager {
    boolean authenticate(String username, String password)
        throws AuthenticationException, LDAPException;
    boolean authenticate(String username, String password, String url)
        throws AuthenticationException, LDAPException;
    boolean authenticate(String username, String password, String url, String anotherParam)
        throws AuthenticationException, LDAPException;
    //and on and on...
    boolean authenticate(String username, String password, Object... args)
        throws AuthenticationException, LDAPException;

    /**
     * Disconnects the connection.
     */
    void disconnect();
}