Spring Security教程（9）---- 自定义AccessDeniedHandler

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在Spring默认的AccessDeniedHandler中只有对页面请求的处理，而没有对Ajax的处理。而在项目开发是Ajax又是我们要常用的技术，所以我们可以通过自定义AccessDeniedHandler来处理Ajax请求。我们在Spring默认的AccessDeniedHandlerImpl上稍作修改就可以了。

public class DefaultAccessDeniedHandler implements AccessDeniedHandler {/* (non-Javadoc) * @see org.springframework.security.web.access.AccessDeniedHandler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.springframework.security.access.AccessDeniedException) */private String errorPage;    //~ Methods ========================================================================================================    public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException accessDeniedException)            throws IOException, ServletException {    boolean isAjax = ControllerTools.isAjaxRequest(request);    if(isAjax){    Message msg = MessageManager.exception(accessDeniedException);    ControllerTools.print(response, msg);    }else if (!response.isCommitted()) {            if (errorPage != null) {                // Put exception into request scope (perhaps of use to a view)                request.setAttribute(WebAttributes.ACCESS_DENIED_403, accessDeniedException);                // Set the 403 status code.                response.setStatus(HttpServletResponse.SC_FORBIDDEN);                // forward to error page.                RequestDispatcher dispatcher = request.getRequestDispatcher(errorPage);                dispatcher.forward(request, response);            } else {                response.sendError(HttpServletResponse.SC_FORBIDDEN, accessDeniedException.getMessage());            }        }    }    /**     * The error page to use. Must begin with a "/" and is interpreted relative to the current context root.     *     * @param errorPage the dispatcher path to display     *     * @throws IllegalArgumentException if the argument doesn't comply with the above limitations     */    public void setErrorPage(String errorPage) {        if ((errorPage != null) && !errorPage.startsWith("/")) {            throw new IllegalArgumentException("errorPage must begin with '/'");        }        this.errorPage = errorPage;    }}

这里我们直接将异常信息通过PrintWriter输出到前台，然后在前台做统一的处理就可以了。在前台对后台消息统一处理的方法可以参考我的这篇文章http://blog.csdn.net/jaune161/article/details/18135607

最后在配置文件中配置下

<sec:http auto-config="true" access-decision-manager-ref="accessDecisionManager"><sec:access-denied-handler ref="accessDeniedHandler"/><sec:session-management invalid-session-url="/login.jsp" /><sec:intercept-url pattern="/app.jsp" access="AUTH_LOGIN"/><sec:intercept-url pattern="/**" access="AUTH_GG_FBGBGG"/><sec:form-login login-page="/login.jsp" authentication-failure-url="/login.jsp"default-target-url="/index.jsp"/></sec:http><!-- 自定义权限不足处理程序 --><bean id="accessDeniedHandler" class="com.zrhis.system.security.RequestAccessDeniedHandler"><property name="errorPage" value="/WEB-INF/error/403.jsp"></property></bean>

session-management本来计划在之前就讲的，但是准备深入讲下session-management所以就一直没有讲。今天既然提到了就简单的说下session-management最简单的配置，就是上面的配置invalid-session-url表示Session失效时跳转的连接。随后会深入讲下这个。

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