java – 生成随机IP地址

private void callingGeoService() {
        int p1 = 255;
        int p2 = 0;
        int p3 = 0;
        int inc = 5;

        String ipAddress = generateIPAddress(p1,p2,p3);

        p3 += inc;
        if (p3 > 255) {
            p3 = 0;
            p2 += inc;
            if (p2 > 255) {
                p2 = 0;
                p1--;
                if (p1 <= 0) {
                    p1 = 0;
                }
            }
        }
    }

//这是generateIPAddress方法

private String generateIPAddress(int p1,int p2,int p3) {

    StringBuilder sb = null;

    int b1 = (p1 >> 24) & 0xff;
    int b2 = (p2 >> 16) & 0xff;
    int b3 = (p3 >>  8) & 0xff;
    int b4 = 0;

    String ip1 = Integer.toString(b1);
    String ip2 = Integer.toString(b2);
    String ip3 = Integer.toString(b3);
    String ip4 = Integer.toString(b4);

    //Now the IP is b1.b2.b3.b4
    sb = new StringBuilder();
    sb.append(ip1).append(".").append(ip2).append(".").append(ip3).append(".").append(ip4);
    // System.out.println(sb);

    return sb.toString();

}

我想要一些随机ipAddress基本上所以我有硬编码的起始ipAddress位的形式为p1,p3,最后一位应为0.