过滤器

目录

• 原生注解
• boot方式

原生注解

tomcat那篇有对urlPatterns的详解
1:添加注解，实现接口
@WebFilter(urlPatterns = "/*")
public class TIFAuthenticationFilter implements Filter {}

2：启动类上加注解
@ServletComponentScan

boot方式

点击查看代码

import javax.servlet.*;
import javax.servlet.FilterConfig;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

public class TestFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("TestFilter过滤器 方法执行前...");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        System.out.println("TestFilter过滤器 方法执行后...");
    }
}
//配置config 
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FilterConfig {
    @Bean
    public FilterRegistrationBean testFilter(){
        FilterRegistrationBean filterRegistry = new FilterRegistrationBean();
        filterRegistry.setFilter(new TestFilter());
        filterRegistry.setOrder(1);
        filterRegistry.setName("testFilter");
        filterRegistry.addUrlPatterns("/*");
        return filterRegistry;
    }
}