Spring Security认证：用户名获得无SPRING_SECURITY_LAST_USERNAME [英] Spring security authentication: get username without SPRING_SECURITY_LAST_USERNAME

问题描述

我在春天框架新。我创建了我的web应用程序的登录页面，我希望用户对应用程序的任何行动之前登录。如果用户输入凭据好一切它的确定和工作，但如果进入坏的我想显示一条消息，并保持用户名输入元素上。显示一个消息是没有问题的，但我不能够保持用户名在我的JPS文件，而无需使用pcated变量SPRING_SECURITY_LAST_USERNAME去$ P $。

I'm new at spring framework. I'm creating a login page for my webapp and I want the user to login before any action on the app. If the user enters good credentials everything it's ok and working, but if enters bad ones I want to display a message and keep the username on the input element. Displaying a message is not a problem, but I'm not able to keep the username in my jps file without using the deprecated variable SPRING_SECURITY_LAST_USERNAME.

希望有人能帮助我，我使用Spring 3。

Hope someone can help me, I'm using Spring 3.

更新：要求说，我不希望显示的URL的用户名

UPDATE: the requirements says I don't want to display the username on the url.

推荐答案

去$ P $的文档pcated不断告诉你应该怎么做：

The documentation of the deprecated constant tells exactly what you should do:

/**
 * @deprecated If you want to retain the username, cache it in a customized {@code AuthenticationFailureHandler}
 */
@Deprecated
public static final String SPRING_SECURITY_LAST_USERNAME_KEY =
           "SPRING_SECURITY_LAST_USERNAME";

事情是这样的：

public class UserNameCachingAuthenticationFailureHandler
    extends SimpleUrlAuthenticationFailureHandler {

    public static final String LAST_USERNAME_KEY = "LAST_USERNAME";

    @Autowired
    private UsernamePasswordAuthenticationFilter usernamePasswordAuthenticationFilter;

    @Override
    public void onAuthenticationFailure(
            HttpServletRequest request, HttpServletResponse response,
            AuthenticationException exception)
            throws IOException, ServletException {

        super.onAuthenticationFailure(request, response, exception);

        String usernameParameter =
            usernamePasswordAuthenticationFilter.getUsernameParameter();
        String lastUserName = request.getParameter(usernameParameter);

        HttpSession session = request.getSession(false);
        if (session != null || isAllowSessionCreation()) {
            request.getSession().setAttribute(LAST_USERNAME_KEY, lastUserName);
        }
    }
}

在您的安全配置：

<security:http ...>
    ...
    <security:form-login
        authentication-failure-handler-ref="userNameCachingAuthenticationFailureHandler"
    ...
    />
</security:http>

<bean 
    id="userNameCachingAuthenticationFailureHandler"
    class="so.UserNameCachingAuthenticationFailureHandler">
    <property name="defaultFailureUrl" value="/url/to/login?error=true"/>
</bean>

在你的login.jsp：

In your login.jsp:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="true" %>

...

<%--in the login form definition--%>
<input id="j_username" name="j_username" type="text" 
    value="<c:out value="${sessionScope.LAST_USERNAME}"/>"/>

这篇关于Spring Security认证：用户名获得无SPRING_SECURITY_LAST_USERNAME的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！