SpringMVC的filter怎么使用Autowired依賴注入bean

有的時候根據我們業務的需要，我們需要在web項目中定義一個自己的filter,并想在這個filter中使用@Autowired注入bean供我們使用。如果直接使用的話是不行的，需要我們在xml文件中進行配置。下面就根據我的一個項目寫一個示例:

步驟一、定義一個ClientSessionFilter，在這個Filter中注入我們想要的bean

public class ClientSessionFilter implements Filter {private static Logger log = Logger.getLogger(ClientSessionFilter.class);@Autowiredprivate RequestData requestData; //我們想要注入的bean@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {ObjectMapper mapper = new ObjectMapper();HttpServletRequest httpServletReq = (HttpServletRequest) request;String session = httpServletReq.getHeader("S");ClientSession cs;if(StringUtils.isNotBlank(session)) {try {cs = mapper.readValue(session, ClientSession.class);} catch (Exception e) {log.error("Session序列化錯誤" + e);throw new BusinessException(401, "Session序列化錯誤");}if(log.isDebugEnabled()) {log.debug(cs);}requestData.setClientSession(cs);}chain.doFilter(request, response);}@Overridepublic void destroy() {}
}

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步驟二、在spring的配置文件application.xml中配置我們想要的bean和自定義的filter

<bean id="requestData" scope="request" class="cn.ucmed.common.cache.RequestData"><aop:scoped-proxy/> //這個標簽可以參考上一遍博客
</bean><bean id="clientSessionFilter" class="cn.ucmed.baseline.d2d.filter.ClientSessionFilter" />

步驟三、在web.xml中配置fileter

<filter><filter-name>filterProxy</filter-name><filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class><async-supported>true</async-supported><init-param><param-name>targetBeanName</param-name><param-value>clientSessionFilter</param-value></init-param><init-param><param-name>targetFilterLifecycle</param-name><param-value>true</param-value></init-param>
</filter>
<filter-mapping><filter-name>filterProxy</filter-name><url-pattern>/registeryuyue/*</url-pattern>
</filter-mapping>