for (Iterator it = targetBeans.values().iterator(); it.hasNext(); ) {
UserKindComparisonAware comparison = (UserKindComparisonAware)it.next();
comparison.setCurrentUserKind(userKind);
}
chain.doFilter(request, response);
}
private synchronized void doInit() throws ServletException {
if ((targetClass == null) || "".equals(targetClass)) {
throw new ServletException("targetClass must be specified");
}
Class _targetClass;
try {
_targetClass = Thread.currentThread().getContextClassLoader().loadClass(targetClass);
} catch (ClassNotFoundException ex) {
throw new ServletException("Class of type " + targetClass + " not found in classloader");
}
targetBeans = BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, _targetClass, true, true);
if (targetBeans.size() == 0) {
throw new ServletException("Bean context must contain at least one bean of type " + targetClass);
}
for (Iterator it = targetBeans.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry)it.next();
if (!(entry.getValue() instanceof UserKindComparisonAware)) {
throw new ServletException("Bean '" + entry.getKey() +
"' does not implement cn.net.cogent.summer.extension.acegisecurity.providers.UserKindComparisonAware");
}
}
// Set initialized to true at the end of the synchronized method, so
// that invocations of doFilter() before this method has completed will not
// cause NullPointerException
initialized = true;
}
protected String obtainUserKind(HttpServletRequest request) {
return request.getParameter(ACEGI_SECURITY_FORM_USERKIND);
}
}
PreAuthenticationProcessingFilter需要在初始化参数中指定targetClass，该参数的值是一个类，该类实现了UserKindComparisonAware接口。PreAuthenticationProcessingFilter找到容器中所有该类的实例，并把捕获的当前登录用户的用户类型标志赋值给它们。PreAuthenticationProcessingFilter的配置如下：
＜bean id="preAuthenticationProcessingFilter"
class="cn.net.cogent.summer.extension.acegisecurity.ui.webapp.PreAuthenticationProcessingFilter"＞
＜property name="targetClass"
value="cn.net.cogent.summer.extension.acegisecurity.providers.dao.MKUDaoAuthenticationProvider"/＞
＜/bean＞
还需要把preAuthenticationProcessingFilter加入到filterChainProxy的配置中：
＜bean id="filterChainProxy" class="org.acegisecurity.util.FilterChainProxy"＞
＜property name="filterInvocationDefinitionSource"＞
＜value＞
CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
PATTERN_TYPE_APACHE_ANT
/**=,preAuthenticationProcessingFilter,authenticationProcessingFilter,
＜/value＞
＜/property＞
＜/bean＞
注意把它放在authenticationProcessingFilter的前面
至此我们初步实现了使用Acegi实现多种用户登录
