springboot之如何使用Filter
在springboot中使用servlet的话,用servlet3.0比较简单
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
然后创建一个Filter,只要在类上加@WebFilter(filterName = "oneFilter",urlPatterns = "/*")注解就代表这是Filter不用在web.xml中配置Filter了,name属性,就是以前web.xml中Filtername标签,随便起就行,urlPatterns = "/*"这个属性是拦截servlet的路径.
package com.buba.filter; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException; @WebFilter(filterName = "oneFilter",urlPatterns = "/*") public class OneFilter implements Filter { public OneFilter() { System.out.println("实力化Filter!"); } @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("初始化Filter!"); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("执行Filter!"); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { System.out.println("销毁Filter!"); } }