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Java实现的IP4地址合法判断新思路

news 2025/9/2 13:45:36

文章目录

一，需求概述
二，代码实现
三，运行结果

一，需求概述

给定一字符串，判断是否为合法的IP4地址。

二，代码实现


import java.util.List;
import java.util.Objects;
import java.util.Random;
import java.util.stream.Collectors;
import java.util.stream.Stream;import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.junit.jupiter.api.Test;import lombok.extern.slf4j.Slf4j;/*** ip4地址合法判断<br>* 注意：0.0.0.0（表示本地网络）、255.255.255.255（表示本地广播）是合法的* * @see [类、类#方法、类#成员]*/
@Slf4j
public class IP4Test
{@Testpublic void test001(){for (int i = 0; i < 10; i++){List<String> nums = new Random().ints(4, -10, 300).mapToObj(Objects::toString).collect(Collectors.toList());String ip4 = StringUtils.join(nums, ".");log.info("IP4地址: {} ==> {}", ip4, isIp4(ip4));}}private Boolean isIp4(String ip4){String[] ipArrs = StringUtils.split(ip4, ".");return StringUtils.countMatches(ip4, ".") == 3 // 3dots&& ipArrs.length == 4 // 4位&& Stream.of(ipArrs).filter(it -> StringUtils.equals(it, String.valueOf(NumberUtils.toInt(it)))).map(NumberUtils::toInt).filter(it -> (0 <= it && it <= 255))// [0, 255].count() == 4;}
}

三，运行结果

2025-09-01 21:20:21.386  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 163.278.264.254 ==> false
2025-09-01 21:20:21.393  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 82.31.212.204 ==> true
2025-09-01 21:20:21.393  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 147.4.7.257 ==> false
2025-09-01 21:20:21.393  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 205.127.278.4 ==> false
2025-09-01 21:20:21.393  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 147.142.72.191 ==> true
2025-09-01 21:20:21.393  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 33.26.-10.33 ==> false
2025-09-01 21:20:21.394  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 130.281.293.240 ==> false
2025-09-01 21:20:21.394  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 192.203.292.3 ==> false
2025-09-01 21:20:21.394  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 158.99.278.165 ==> false
2025-09-01 21:20:21.394  INFO 1220 --- [           main] c.f.t.IP4Test                            : IP4地址: 188.131.294.172 ==> false