java - 无法删除我的 ip_address 中的前导零

Question

该函数应该从 IPv4 地址中删除前导零。例如，地址 007.006.02.90 应该转换为 7.6.2.90。似乎问题出在这一行:

public static String zero_cutter(String ip) {
    String ipnew;
    String []  spliti = ip.split(".");
    int[] myArray = new int[4];

    for (int i = 0; i < 4; i++) {
        myArray [i] = Integer.parseInt(spliti [i]);
    }

    for (int i = 0; i < 4; i++) {
        spliti [i]  = Integer.toString(myArray [i]);
    }
    ipnew = spliti [0] + "." + spliti [1] + "." + spliti [2] +    "." + spliti [3];

    return ipnew;
}

Answer 1

您必须转义模式中的 . 字符，因为点是匹配任何字符的特殊字符(根据 java.util.regex.Pattern javadoc )。

Predefined character classes

. Any character (may or may not match line terminators)

一种方法是在模式中使用 \\:

String[] spliti = ip.split("\\.");\

但是您可以将代码替换为 InetAddress类:

String ip = "007.006.002.090";
InetAddress addr = InetAddress.getByName(ip);
System.out.println(addr.getHostAddress()); // 7.6.2.90