Spring Boot 整合Filter

两种方法

方法一：

　　正常创建好Filter类，配置完成

package clc.user.filter;


import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * ClassName: FirstFilter<br/>
 * Description: <br/>
 * date: 2019/4/1 5:31 PM<br/>
 *
 * @author chengluchao
 * @since JDK 1.8
 */
@WebFilter(filterName = "FirstFilter", urlPatterns = {"/FirstFilter", "/FirstServlet"})
public class FirstFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init-FirstFilter");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("doFilter-FirstFilter");
    }

    @Override
    public void destroy() {
        System.out.println("destroy-FirstFilter");
    }
}

启动类使用注解ServletComponentScan

@SpringBootApplication
@ServletComponentScan
public class UserServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(UserServiceApplication.class, args);
    }
}

方法二：

写好Filte但不进行配置，在启动类中进行配置

package clc.user.filter;


import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * ClassName: SecondFilter<br/>
 * Description: <br/>
 * date: 2019/4/1 5:31 PM<br/>
 *
 * @author chengluchao
 * @since JDK 1.8
 */
public class SecondFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init-SecondFilter");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("doFilter-SecondFilter");
    }

    @Override
    public void destroy() {
        System.out.println("destroy-SecondFilter");
    }
}

@SpringBootApplication
public class UserServiceApplication2 {

    @Bean
    public ServletRegistrationBean getServletRegistrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
        bean.addUrlMappings("/SecondServlet");
        return bean;
    }


    @Bean
    public FilterRegistrationBean getFilterRegistrationBean() {
        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
        bean.addUrlPatterns("/SecondServlet","/123");
        return bean;
    }

    public static void main(String[] args) {
        SpringApplication.run(UserServiceApplication2.class, args);
    }
}

注意，所有的路径必须以"/"开头