Question

java 判断字符串是不是是IP

Answer 1

public static void main(String[] args) {
String myIP = "160.1.1.1";
boolean state = isIp(myIP);
System.out.println(state);
}

public static boolean isIp(String ip){//判断是否是一个IP
boolean b = false;
ip = trimSpaces(ip);
if(ip.matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}")){
String s[] = ip.split("\\.");
if(Integer.parseInt(s[0])<255)
if(Integer.parseInt(s[1])<255)
if(Integer.parseInt(s[2])<255)
if(Integer.parseInt(s[3])<255)
b = true;
}
return b;
}
public static String trimSpaces(String ip){//去掉IP字符串前后所有的空格
while(ip.startsWith(" ")){
ip= ip.substring(1,ip.length()).trim();
}
while(ip.endsWith(" ")){
ip= ip.substring(0,ip.length()-1).trim();
}
return ip;
}

希望能帮到你！

Answer 2

正则表达式判断，，