过滤器
public class TimeFilter implements Filter {
/* (non-Javadoc)
* @see javax.servlet.Filter#destroy()
*/
@Override
public void destroy() {
System.out.println("time filter destroy");
}
/* (non-Javadoc)
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.println("time filter start");
long start = System.currentTimeMillis();
chain.doFilter(request, response);
System.out.println("time filter 耗时:"+ (System.currentTimeMillis() - start));
System.out.println("time filter finish");
}
/* (non-Javadoc)
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
@Override
public void init(FilterConfig arg0) throws ServletException {
System.out.println("time filter init");
}
}
配置过滤器
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public FilterRegistrationBean timeFilter(){
FilterRegistrationBean registrationBean = new FilterRegistrationBean();
TimeFilter timeFilter = new TimeFilter();
registrationBean.setFilter(timeFilter);
List<String> urls = new ArrayList<>();
urls.add("/*");
registrationBean.setUrlPatterns(urls);
return registrationBean;
}
}
这样写和在过滤器上写一个
@Component注解是一样的，
但是这样写有一个好处，也可以指定过滤器过滤哪些路径
