shiro spring-web集成

系统管理员 2022-05-21 01:30 249阅读 0赞

*  shiro 在web的初始化流程
    
     *  基本知识:
        
         *  web.xml的加载顺序
         *  filter 生命周期
     *  web.xml 中 shiro的配置
     *  spring-mvc 配置
     *  shiro.ini配置
 *  主体
    
     *  init
     *  doFilter
     *  destory
 *  总结
 *  参考网站:

# 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 ###

1.  容器初始化时调用 init
2.  每次请求时 doFilter
3.  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" />
            
            <property name="loginUrl" value="/login.action" />
            
            <property name="successUrl" value="/index.action" />
            
            <property name="unauthorizedUrl" value="/refuse.action" />
    
            
            <property name="filterChainDefinitions">
                <value>
                    
                    /login/account = anon
    
                    /user = perms["user:view"]
                    
                    
    
                    
                    /logout = logout
    
                    
                    /** = authc
    
                    
                    
                </value>
            </property>
        </bean>
    
        
        <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
            
            <property name="realm" ref="customRealm" />
            <property name="sessionManager" ref="sessionManager"/>
        </bean>
    
        
        <bean id="sessionManager" class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
            
            <property name="globalSessionTimeout" value="600000" />
            
            <property name="deleteInvalidSessions" value="true" />
        </bean>
    
        
        <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 #

![DelegatingFilterProxy类图][DelegatingFilterProxy]

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 ##

1.  判断是否有代理类,没有就初始化
2.  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][https_www.cnblogs.com_qlqwjy_p_7257502.html]
 *  maven shiro spring 配置: [https://blog.csdn.net/userrefister/article/details/72760424][https_blog.csdn.net_userrefister_article_details_72760424]

[DelegatingFilterProxy]: https://gitee.com/ls9527/src-analysis/raw/master/shiro/uml/class/DelegatingFilterProxy.png
[https_www.cnblogs.com_qlqwjy_p_7257502.html]: https://www.cnblogs.com/qlqwjy/p/7257502.html
[https_blog.csdn.net_userrefister_article_details_72760424]: https://blog.csdn.net/userrefister/article/details/72760424