SpringBoot整合Filter的两种方式

方式一 ：通过注解方式实现

项目名称：032-springboot-filter-01

1.通过注解方式创建一个Filer

在com.abc.springboot.filter包下创建MyFilter

package com.abc.springboot.filter;

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

/**
 * ClassName:MyFilter
 * Package:com.abc.springboot.filter
 * Description:

 */
@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("您已进入filter过滤器，您的请求正常，请继续遵循规则....");
        filterChain.doFilter(servletRequest,servletResponse);
    }
}

2.在主应用程序Application类上添加@ServletComponentScan("basePackages = "com.abc.springboot.filter")

package com.abc.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@ServletComponentScan(basePackages = "com.abc.springboot.filter")
@SpringBootApplication
public class Application {

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

}

3.启动应用SpringBoot，浏览器访问测试

因为过滤所有请求，所以随便输入一个地址，控制台都会输出

方式二 ：通过Spring Boot的配置类实现

项目名称：033-springboot-filter-02

1.创建一个普通的Filter

在com.abc.springboot.filter包下，创建HeFilter类

package com.abc.springboot.filter;

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

/**
 * ClassName:HeFilter
 * Package:com.abc.springboot.filter
 * Description:

 */
@WebFilter(urlPatterns = "/*")
public class HeFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        System.out.println("He已进入Filter过滤器，您的请求正常，请继续遵循规则...");

        filterChain.doFilter(servletRequest,servletResponse);
    }
}

2.编写一个Spring Boot的配置类，在该类中注册Filter

在com.abc.springboot.config包下创建FilterConfig配置类

package com.abc.springboot.config;

import com.abc.springboot.filter.HeFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


/**
 * ClassName:FilterConfig
 * Package:com.abc.springboot.config
 * Description:

 */
@Configuration //该注解将此类标记为配置类
public class FilterConfig {


    @Bean
    public FilterRegistrationBean heFilterRegistration() {

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new HeFilter());

        filterRegistrationBean.addUrlPatterns("/*");

        return filterRegistrationBean;
    }
}

3.启动应用SpringBoot，浏览器访问测试

因为过滤所有请求，所以随便输入一个地址，控制台都会输出