shiro 在web的初始化流程
基本知识:
web.xml的加载顺序
context-param -> listener -> filter -> servlet
filter 生命周期
- 容器初始化时调用 init
- 每次请求时 doFilter
- 容器卸载时调用 destory
web.xml 中 shiro的配置
<filter>
<filter-name>shiroFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
<init-param>
<param-name>targetFilterLifecycle</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>targetBeanName</param-name>
<param-value>shiroFilter</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>shiroFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
spring-mvc 配置
装配了 shiroFilter 对象,和内置的属性
<bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
<property name="securityManager" ref="securityManager" />
<!-- loginUrl认证提交地址,如果没有认证将会请求此地址进行认证,请求此地址将由formAuthenticationFilter进行表单认证 -->
<property name="loginUrl" value="/login.action" />
<!-- 认证成功统一跳转到first.action,建议不配置,shiro认证成功自动到上一个请求路径 -->
<property name="successUrl" value="/index.action" />
<!-- 通过unauthorizedUrl指定没有权限操作时跳转页面 -->
<property name="unauthorizedUrl" value="/refuse.action" />
<!-- 过虑器链定义,从上向下顺序执行,一般将/**放在最下边 -->
<property name="filterChainDefinitions">
<value>
<!-- 静态资源放行 -->
/login/account = anon
/user = perms["user:view"]
<!--商品查询需要商品查询权限 ,取消url拦截配置,使用注解授权方式 -->
<!-- /itemEdit.action = perms[item:edit] -->
<!-- 请求 logout.action地址,shiro去清除session -->
/logout = logout
<!-- /** = authc 所有url都必须认证通过才可以访问 -->
/** = authc
<!-- 所有url都可以匿名访问 -->
<!-- /** = anon -->
</value>
</property>
</bean>
<!-- securityManager安全管理器 -->
<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
<!-- 注入realm -->
<property name="realm" ref="customRealm" />
<property name="sessionManager" ref="sessionManager"/>
</bean>
<!-- 会话管理器 -->
<bean id="sessionManager"
class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
<!-- session的失效时长,单位毫秒 -->
<property name="globalSessionTimeout" value="600000" />
<!-- 删除失效的session -->
<property name="deleteInvalidSessions" value="true" />
</bean>
<!-- realm -->
<bean id="customRealm" class="org.apache.shiro.realm.text.IniRealm">
<constructor-arg index="0" value="classpath:shiro.ini"/>
</bean>
shiro.ini配置
[users]
root = root, admin
guest = guest, guestrole
[roles]
admin = user:*
guestrole = system:*
主体
org.springframework.web.filter.DelegatingFilterProxy 是一个实现了Filter接口的类
实际上在web运行过程中,运行代理bean的所有操作
代理bean配置为: targetBeanName
接下来介绍 DelegatingFilterProxy 在生命周期中是如何调用代理bean相应的方法的
init
父类GenericFilterBean 实现了init
GenericFilterBean
public final void init(FilterConfig filterConfig) throws ServletException {
Assert.notNull(filterConfig, "FilterConfig must not be null");
if (logger.isDebugEnabled()) {
logger.debug("Initializing filter '" + filterConfig.getFilterName() + "'");
}
this.filterConfig = filterConfig;
// Set bean properties from init parameters.
try {
PropertyValues pvs = new FilterConfigPropertyValues(filterConfig, this.requiredProperties);
BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this);
ResourceLoader resourceLoader = new ServletContextResourceLoader(filterConfig.getServletContext());
bw.registerCustomEditor(Resource.class, new ResourceEditor(resourceLoader, this.environment));
initBeanWrapper(bw);
bw.setPropertyValues(pvs, true);
}
catch (BeansException ex) {
String msg = "Failed to set bean properties on filter '" +
filterConfig.getFilterName() + "': " + ex.getMessage();
logger.error(msg, ex);
throw new NestedServletException(msg, ex);
}
// Let subclasses do whatever initialization they like.
initFilterBean();
if (logger.isDebugEnabled()) {
logger.debug("Filter '" + filterConfig.getFilterName() + "' configured successfully");
}
}
级别2
initFilterBean();
DelegatingFilterProxy
@Override
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);
}
}
}
}
级别3
this.delegate = initDelegate(wac);
获取web.xml 里面配置的targetBeanName: shiroFilter, 用shiroFilter.init
DelegatingFilterProxy
protected Filter initDelegate(WebApplicationContext wac) throws ServletException {
Filter delegate = wac.getBean(getTargetBeanName(), Filter.class);
if (isTargetFilterLifecycle()) {
delegate.init(getFilterConfig());
}
return delegate;
}
doFilter
- 判断是否有代理类,没有就初始化
- 用代理类的doFilter
DelegatingFilterProxy
@Override
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) {
if (this.delegate == null) {
WebApplicationContext wac = findWebApplicationContext();
if (wac == null) {
throw new IllegalStateException("No WebApplicationContext found: " +
"no ContextLoaderListener or DispatcherServlet registered?");
}
this.delegate = initDelegate(wac);
}
delegateToUse = this.delegate;
}
}
// Let the delegate perform the actual doFilter operation.
invokeDelegate(delegateToUse, request, response, filterChain);
}
级别2
invokeDelegate(delegateToUse, request, response, filterChain);
DelegatingFilterProxy
protected void invokeDelegate(
Filter delegate, ServletRequest request, ServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
delegate.doFilter(request, response, filterChain);
}
destory
DelegatingFilterProxy
protected void destroyDelegate(Filter delegate) {
if (isTargetFilterLifecycle()) {
delegate.destroy();
}
}
public void destroy() {
Filter delegateToUse = this.delegate;
if (delegateToUse != null) {
destroyDelegate(delegateToUse);
}
}
总结
org.springframework.web.filter.DelegatingFilterProxy 使用代理模式
实际上调用的是web.xml配置的 targetBeanName 的init,doFilter,destory
参考网站:
- shiro spring 配置结合: https://www.cnblogs.com/qlqwjy/p/7257502.html
- maven shiro spring 配置: https://blog.csdn.net/userrefister/article/details/72760424