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Spring boot中filter類不能注入@Autowired變數

問題描述

專案中的登入是用了shiro以及filter攔截器。輸入正確的賬號密碼之後卻不能正常登入。除錯程式碼發現是filter類中定義的變數userService沒有值,為null,該變數採用的方式是@Autowired自動注入。由此我認為shiro配置類還是有點問題。

解決辦法

在shiroConfig.java(shiro相關bean的定義類)中加入一個bean用來自動注入filter中的變數

    @Bean
    public FilterRegistrationBean myLoginRegistrationBean() {
        FilterRegistrationBean filterRegistration = new
FilterRegistrationBean(); filterRegistration.setFilter(new DelegatingFilterProxy("shiroFilter")); // 該值預設為false,表示生命週期由SpringApplicationContext管理,設定為true則表示由ServletContainer管理 filterRegistration.addInitParameter("targetFilterLifecycle", "true"); filterRegistration.setAsyncSupported(true
); filterRegistration.setEnabled(true); filterRegistration.setDispatcherTypes(DispatcherType.REQUEST); // filterRegistration.addUrlPatterns("/*");// 可以自己靈活的定義很多,避免一些根本不需要被Shiro處理的請求被包含進來 // filterRegistration.setName("MyLoginFilter"); // filterRegistration.setOrder(1);
return filterRegistration; }

這裡面需要注意的是:

filterRegistration.setFilter(new DelegatingFilterProxy("shiroFilter"));

這行程式碼,裡面的shiroFilter表示另一個bean。如果你只有一個filter類,可以直接將shiroFilter替換為你的filter物件,如:

filterRegistration.setFilter(new MyUserFilter());

更正:
上面那行單獨給filter注入值的寫法不對!,應該是先給這個filter定義一個bean:

 @Bean(name = "myUserFilter")
      public MyUserFilter myUserFilterBean() {
        MyUserFilter bean=new MyUserFilter();
        return new MyUserFilter();
 }

然後:

filterRegistration.setFilter(myUserFilterBean());

因為博主專案中有三個filter類,所以不能用第二種new 物件定義,即時寫了三個這種bean,還是隻有一個filter中的變數能夠被注入!所以只能用new DelegatingFilterProxy(“shiroFilter”)方式,因為shiroFilter中已經有了三個filter的定義。其餘的相關bean如下:

    @Bean(name = "formAuthenticationFilter")
      public MyLoginFilter myLoginFilterBean() {
        MyLoginFilter bean=new MyLoginFilter();
        bean.setUsernameParam("username");
        bean.setPasswordParam("password");
        bean.setRememberMeParam("rememberMe");
        bean.setLoginUrl("/admin/login");
        bean.setSuccessUrl("/admin/index.view");
        return bean;
    }

    @Bean(name = "sysUserFilter")
      public SysUserFilter sysUserFilterBean() {
    //  SysUserFilter bean=new SysUserFilter();
        return new SysUserFilter();
    }

    @Bean(name = "myUserFilter")
      public MyUserFilter myUserFilterBean() {
    //  MyUserFilter bean=new MyUserFilter();
        return new MyUserFilter();
    }

    @SuppressWarnings("null")
    @Bean(name = "shiroFilter")
    public ShiroFilterFactoryBean shiroFilterFactoryBean(@Qualifier("securityManager") DefaultWebSecurityManager securityManager) {
        logger.info("注入Shiro的Web過濾器-->shiroFilter", ShiroFilterFactoryBean.class);
        ShiroFilterFactoryBean bean=new ShiroFilterFactoryBean();
        bean.setSecurityManager(securityManager);
        bean.setLoginUrl("/admin/login");
        Map<String, Filter> filters = bean.getFilters();//獲取filters
        filters.put("authc", myLoginFilterBean());     //filters中放入三個filter
        filters.put("sysUser", sysUserFilterBean());
        filters.put("user", myUserFilterBean());
        bean.setFilters(filters);
        LinkedHashMap<String, String> filterChainDefinitionMap=new LinkedHashMap<>();
        filterChainDefinitionMap.put("/admin/login", "authc");
        filterChainDefinitionMap.put("/admin/api/**", "sysUser");
        filterChainDefinitionMap.put("/admin/**", "user");
        bean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return bean;
    }