filter加載springbean
阿新 • • 發佈:2017-09-14
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tomcat容器初始化順序監聽器–>過濾器–>servlet,因此springMVCservlet初始化之前,過濾器就已經初始化過了,如果在過濾器中需要註入spring容器管理的bean是註入不進去的,因此需要在spring監聽器中初始化需要註入的bean,才能在過濾器中註入,而且過濾器的定義需要使用spring定義的DelegatingFilterProxy來實現,web.xml部分代碼如下
<filter>
<filter-name>testFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>testFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
其余部分只需要在spring容器中加載testFilter就行了,例子testFilter如下:
註意此處的filter必須為實現javax.Filter的類,而且初始化需要放在spring監聽器中,即必須在過濾器初始化之前初始化
@Component
public class TestFilter implements Filter
{
private static final Logger logger = LogManager.getLogger(TestFilter.class);
@Autowired
private UserService userService;
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)
throws ServletException, IOException
{
logger.info(JSONArray.fromObject(userService.list()));
filterChain.doFilter(request, response);
}
@Override
public void init(FilterConfig filterConfig)
throws ServletException
{
logger.info("初始化filter");
}
@Override
public void destroy()
{
logger.info("destroyfilter");
}
}
如果要保留Filter原有的init,destroy方法的調用,還需要配置初始化參數targetFilterLifecycle為true,該參數默認為false,代碼例子如下:
<filter>
<filter-name>testFilter</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>
</filter>
<filter-mapping>
<filter-name>testFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
filter加載springbean