cas服务端后续

最新推荐文章于 2023-01-22 20:46:00 发布

原创最新推荐文章于 2023-01-22 20:46:00 发布 · 607 阅读

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本文介绍了CAS服务端配置的SafeDispatcherServlet，该Servlet用于转发请求到webflow进行处理。解析了其工作原理，包括初始化过程和服务请求的具体实现，并说明了在web.xml中的配置方式。

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public final class SafeDispatcherServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public static final String CAUGHT_THROWABLE_KEY = "exceptionCaughtByServlet";
    private static final Logger LOGGER = LoggerFactory.getLogger(SafeDispatcherServlet.class);
    private DispatcherServlet delegate = new DispatcherServlet();
    private boolean initSuccess = true;

    public SafeDispatcherServlet() {
    }

    public void init(ServletConfig config) {
        try {
            this.delegate.init(config);
        } catch (Throwable var5) {
            this.initSuccess = false;
            String message = "SafeDispatcherServlet: \nThe Spring DispatcherServlet we wrap threw on init.\nBut for our having caught this error, the servlet would not have initialized.";
            LOGGER.error("SafeDispatcherServlet: \nThe Spring DispatcherServlet we wrap threw on init.\nBut for our having caught this error, the servlet would not have initialized.", var5);
            ServletContext context = config.getServletContext();
            context.log("SafeDispatcherServlet: \nThe Spring DispatcherServlet we wrap threw on init.\nBut for our having caught this error, the servlet would not have initialized.", var5);
            context.setAttribute("exceptionCaughtByServlet", var5);
        }

    }

    public void service(ServletRequest req, ServletResponse resp) throws ServletException, IOException {
        if (this.initSuccess) {
            this.delegate.service(req, resp);
        } else {
            throw new ApplicationContextException("Unable to initialize application context.");
        }
    }
}

cas服务端配置的servlet，

org.jasig.cas.web.init.SafeDispatcherServlet 这个Servlet主要是进行转发，将接收到的请求转交给webflow来处理。

它实际上是spring-webflow的应用

有关spring-webflow的详细介绍，

网上铺天盖地，我就不啰嗦了

cas server端的web.xml文件里面有

<servlet>
  <servlet-name>cas</servlet-name>
  <servlet-class>
   org.jasig.cas.web.init.SafeDispatcherServlet
  </servlet-class>
  <init-param>
   <param-name>publishContext</param-name>
   <param-value>false</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>

这个是login-webflow的入口servlet，映射的url-pattern之一就是

<servlet-mapping>
<servlet-name>cas</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>

即login

spring webflow必须在flow-registry里面注册，

这个是在cas-servlet.xml里面注册的

<webflow:flow-registry id="flowRegistry" flow-builder-services="builder">
<webflow:flow-location path="/WEB-INF/login-webflow.xml" id="login" />
</webflow:flow-registry>

对应的view　properties在propertyFileConfigurer.xml中指定了