import java.util.*;
public class Solution { /** * 验证IP地址 * @param IP string字符串 一个IP地址字符串 * @return string字符串 */ public String solve (String IP) { //判断可能是IPV4，子串转化为数字，范围是否在0-255，且不以为0开始 //判断可能是IPV6，判断子串是否匹配[0-9a-fA-F],是否最多4位，是否有多余的0 //既不是IPV4，又不是IPV6 if(IP.indexOf(".")!=-1){ String[] subs = IP.split("\\."); if(subs.length!=4){ return "Neither"; } for(int i=0; i<4; i++){ if(!subs[i].matches("[0-9]*")){ return "Neither"; } if(subs[i].startsWith("0")){ return "Neither"; } int tmp = Integer.parseInt(subs[i]); if(tmp>255 || tmp<=0 ){ return "Neither"; } if(i==3){ return "IPv4"; } } } else if(IP.indexOf(":")!=-1){ String[] subs = IP.split(":"); if(subs.length!=8 ||IP.endsWith(":")){ return "Neither"; } for(int i=0; i<8; i++){ if(!subs[i].matches("[0-9a-fA-F]*")){ return "Neither"; } if(subs[i].length()>4){ return "Neither"; } if(subs[i].startsWith("00")|| subs[i].startsWith("000")|| subs[i].startsWith("0000")){ return "Neither"; } if(subs[i].equals("")){ return "Neither"; } int tmp = Integer.parseInt(subs[i],16); if(tmp>65535 || tmp<0 ){ return "Neither"; } if(i==7){ return "IPv6"; } }
}else{ return "Neither"; } return "Neither"; } }
标签：tmp,return,subs,验证,IP,IP地址,Neither From： https://www.cnblogs.com/northli/p/16879170.html