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How to determine whether ip is legal in java

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2019-12-30 15:27:164843browse

How to determine whether ip is legal in java

java判断IP地址是否合法的方法:(推荐:java视频教程

/**
	 * 判断IP地址的合法性,这里采用了正则表达式的方法来判断 return true,合法
	 */
	public static boolean ipCheck(String text) {
		if (text != null && !text.isEmpty()) {
			// 定义正则表达式
			String regex = "^(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|[1-9])\\."
					+ "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\." +"(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."
					+ "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)$";
			// 判断ip地址是否与正则表达式匹配
			if (text.matches(regex)) {
				// 返回判断信息
				return true;
			} else {
				// 返回判断信息
				return false;
			}
		}
		return false;
	}

matches() 方法用于检测字符串是否匹配给定的正则表达式。

调用

public static void main(String[] args) {
		String b = "191.168.32.1";
		if (!Tool.ipCheck(b)) {
			System.out.println("错误");
		}else {
			System.out.println("正确");
		}
	}

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