springboot实现增加黑名单和白名单功能

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

package org.cyl.test.fliter;
import jakarta.servlet.*;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

public class BlackWhiteListFilter implements Filter {

    private List<String> blackList = Arrays.asList("blocked-ip1", "blocked-ip2");
    private List<String> whiteList = Arrays.asList("127.0.0.1", "0:0:0:0:0:0:0:1");

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        String clientIP = request.getRemoteAddr();

        // 检查黑名单
        if (blackList.contains(clientIP)) {
            response.getWriter().write("Your IP is blacklisted.");
            return;
        }

        // 检查白名单
        if (!whiteList.contains(clientIP)) {
            response.getWriter().write("Your IP is not whitelisted.");
            return;
        }

        chain.doFilter(request, response);
    }

    // 可以实现 init 和 destroy 方法，根据需要进行处理
}

package org.cyl.test.config;
import org.cyl.test.fliter.BlackWhiteListFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class WebConfig {

    @Bean
    public FilterRegistrationBean<BlackWhiteListFilter> myFilter() {
        FilterRegistrationBean<BlackWhiteListFilter> registrationBean = new FilterRegistrationBean<>();
        registrationBean.setFilter(new BlackWhiteListFilter());
        registrationBean.addUrlPatterns("/*");
        return registrationBean;
    }
}

package org.cyl.test.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @GetMapping("/allowed-endpoint")
    public String sayHello(){
        return "Hello";
    }
}