1 在web.xml文件中配置
问题:为什么DelegatingFilterProxy的filter-name必须是springSecurityFilterChain?
DelegatingFilterProxy并不是真正的Filter，在其initFilterBean方法中会从WebApplicationContext根据delegate 来获取到
protected void initFilterBean() throws ServletException {
synchronized (this.delegateMonitor) {
if (this.delegate == null) {
// If no target bean name specified, use filter name.
if (this.targetBeanName == null) {
this.targetBeanName = getFilterName();
}
// Fetch Spring root application context and initialize the delegate early,
// if possible. If the root application context will be started after this
// filter proxy, we'll have to resort to lazy initialization.
WebApplicationContext wac = findWebApplicationContext();
if (wac != null) {
this.delegate = initDelegate(wac);
}
}
}
}
在上这代码中 this.targetBeanName=getFilterName() 就是获取名称叫做 springSecurityFilterChain
通过在 doFilter 就去中我们会发现真正干活的其实是 delegate 这个 Filter, 而 delegate 其实就是 FilterChainProxy
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
// Lazily initialize the delegate if necessary.
Filter delegateToUse = this.delegate;
if (delegateToUse == null) {
synchronized (this.delegateMonitor) {
delegateToUse = this.delegate;
if (delegateToUse == null) {
WebApplicationContext wac = findWebApplicationContext();
if (wac == null) {
throw new IllegalStateException("No WebApplicationContext found: " +
"no ContextLoaderListener or DispatcherServlet registered?");
}
delegateToUse = initDelegate(wac);
}
this.delegate = delegateToUse;
}
}
// Let the delegate perform the actual doFilter operation.
invokeDelegate(delegateToUse, request, response, filterChain);
}
FilterChainProxy 是 spring 在解析配置文件时装配到上下文中，并且 beanName 为 springSecurityFilterChain ，
因此在 web.xml 中需要配置 filter-name 为 springSecurityFilterChain
2.在spring-security.xml文件中配置
在配置文件中我们主要使用标签来过多成配置
<!-- 配置不拦截的资源 -->
<security:http pattern="/login.jsp" security="none"/>
<security:http pattern="/failer.jsp" security="none"/>
<security:http pattern="/css/**" security="none"/>
<security:http pattern="/img/**" security="none"/>
<security:http pattern="/plugins/**" security="none"/>
<security:http auto-config="true" use-expressions="false">
<security:intercept-url pattern="/**" access="ROLE_USER,ROLE_ADMIN"/>
<security:form-login
login-page="/login.jsp"
login-processing-url="/login.do"
default-target-url="/index.jsp"
authentication-failure-url="/failer.jsp"
authentication-success-forward-url="/pages/main.jsp"
/>
</security:http>
http 标签是自定义标签，我们可以在 spring-security-config 包中查看
http\://www.springframework.org/schema/security=org.springframework.security.config.SecurityName
spaceHandler
继续查看 SecurityNamespaceHandler 类，在其 init 方法
public void init() {
loadParsers();
}
在 loadParsers() 方法中，指定由 HttpSecurityBeanDefinitionParser 进行解析
parsers.put(Elements.HTTP, new HttpSecurityBeanDefinitionParser())
在 HttpSecurityBeanDefinitionParser 完成具体解析的 parse 方法中
registerFilterChainProxyIfNecessary(pc, pc.extractSource(element));
这里就是注册了名为 springSecurityFilterChain 的 filterChainProxy 类
接下我们在看一下注册一系列 Filter 的地方 createFilterChain ，在这个方法中我们重点关注
AuthenticationConfigBuilder authBldr = new AuthenticationConfigBuilder(element,
forceAutoConfig, pc, httpBldr.getSessionCreationPolicy(),
httpBldr.getRequestCache(), authenticationManager,
httpBldr.getSessionStrategy(), portMapper, portResolver,
httpBldr.getCsrfLogoutHandler());
我们可以查看 AuthenticationConfigBuilder 创建代码
public AuthenticationConfigBuilder(Element element, boolean forceAutoConfig,
ParserContext pc, SessionCreationPolicy sessionPolicy,
BeanReference requestCache, BeanReference authenticationManager,
BeanReference sessionStrategy, BeanReference portMapper,
BeanReference portResolver, BeanMetadataElement csrfLogoutHandler) {
this.httpElt = element;
this.pc = pc;
this.requestCache = requestCache;
autoConfig = forceAutoConfig
| "true".equals(element.getAttribute(ATT_AUTO_CONFIG));
this.allowSessionCreation = sessionPolicy != SessionCreationPolicy.NEVER && sessionPolicy != SessionCreationPolicy.STATELESS;
this.portMapper = portMapper;
this.portResolver = portResolver;
this.csrfLogoutHandler = csrfLogoutHandler;
createAnonymousFilter();
createRememberMeFilter(authenticationManager);
createBasicFilter(authenticationManager);
createFormLoginFilter(sessionStrategy, authenticationManager);
createOpenIDLoginFilter(sessionStrategy, authenticationManager);
createX509Filter(authenticationManager);
createJeeFilter(authenticationManager);
createLogoutFilter();
createLoginPageFilterIfNeeded();
createUserDetailsServiceFactory();
createExceptionTranslationFilter();
}
