java中IP地址与整型的相互转化

在网上找到的IP地址与整型之间的转化，另外加上一个自己写的根据IP和子网掩码获取IP网段的方法

package cn.cloudex.util;


public class IPUtil {
	
	//十进制ip地址转化为长整型（59.225.0.0-->1004601344L）
	public static long getStringIpToLong(String ip) {  
		String[] ips = ip.split("\\.");  
		long num =  16777216L*Long.parseLong(ips[0]) + 65536L*Long.parseLong(ips[1]) + 256*Long.parseLong(ips[2]) + Long.parseLong(ips[3]);  
		return num;  
	}  

	//长整型转化为十进制ip地址（1004601344L-->59.225.0.0）
	public static String getLongIpToString(long ipLong) {     
		long mask[] = {0x000000FF,0x0000FF00,0x00FF0000,0xFF000000};  
		long num = 0;  
		StringBuffer ipInfo = new StringBuffer();  
		for(int i=0;i<4;i++){  
			num = (ipLong & mask[i])>>(i*8);  
			if(i>0) ipInfo.insert(0,".");  
				ipInfo.insert(0,Long.toString(num,10));  
		}  
		return ipInfo.toString();  
	}
	
	//根据IP和子网掩码获取IP网段
	public static String getIPStartAndEnd(String ip,String mask){
		long s1 = getStringIpToLong(ip);
		long s2 = getStringIpToLong(mask);
		String erj = Long.toBinaryString(s2);
		long s3 = s1 & s2;
		long start = getStringIpToLong(getLongIpToString(s3));
		String wl = Long.toBinaryString(s3);
		if(wl.length()<32) {
			int le = 32-wl.length();
			for(int i=0; i<le; i++) {
				wl = "0"+wl;
			}
		}
		String gbl = wl.substring(0,erj.indexOf("0"))+wl.substring(erj.indexOf("0"),wl.length()).replace("0", "1");
		long s4 = Long.parseLong(gbl, 2);
		long end = getStringIpToLong(getLongIpToString(s4));
		return start+"|"+end;
	}
	
	public static void main(String[]arg) {
		System.out.println(IPUtil.getIPStartAndEnd("59.224.192.0", "255.255.192.0"));
		System.out.println(IPUtil.getStringIpToLong("1.12.0.0"));
		System.out.println(IPUtil.getLongIpToString(1004584960L));
		System.out.println(IPUtil.getLongIpToString(1004601343L));
	}
}