SpringBoot整合Filter的兩種方式

方式一 ：通過注解方式實現

項目名稱：032-springboot-filter-01

1.通過注解方式創建一個Filer

在com.abc.springboot.filter包下創建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("您已進入filter過濾器，您的請求正常，請繼續遵循規則....");
        filterChain.doFilter(servletRequest,servletResponse);
    }
}

2.在主應用程序Application類上添加@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.啟動應用SpringBoot，瀏覽器訪問測試

因為過濾所有請求，所以隨便輸入一個地址，控制臺都會輸出

方式二 ：通過Spring Boot的配置類實現

項目名稱：033-springboot-filter-02

1.創建一個普通的Filter

在com.abc.springboot.filter包下，創建HeFilter類

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已進入Filter過濾器，您的請求正常，請繼續遵循規則...");

        filterChain.doFilter(servletRequest,servletResponse);
    }
}

2.編寫一個Spring Boot的配置類，在該類中注冊Filter

在com.abc.springboot.config包下創建FilterConfig配置類

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 //該注解將此類標記為配置類
public class FilterConfig {


    @Bean
    public FilterRegistrationBean heFilterRegistration() {

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

        filterRegistrationBean.addUrlPatterns("/*");

        return filterRegistrationBean;
    }
}

3.啟動應用SpringBoot，瀏覽器訪問測試

因為過濾所有請求，所以隨便輸入一個地址，控制臺都會輸出