IPV4轉換程序

  最近在一個項目中被IP轉換給折騰死了，有些用LONG存儲，還有些用int, 還有些用String存儲。

看着真火大啊，轉換來轉換去的，看的頭都暈了。爲了偷懶還是自己寫幾行代碼，弄個工具轉換一下

算了，磨刀不誤砍柴功嘛。下面是轉換的代碼:

public class IPConvertor{
	// IP Long to String
	public String iPLong2Str(long ipAddr) {  
		StringBuffer sb = new StringBuffer("");  
		sb.append(String.valueOf((ipAddr >>> 24)));  
		sb.append(".");  
		sb.append(String.valueOf((ipAddr & 0x00FFFFFF) >>> 16));  
		sb.append(".");  
		sb.append(String.valueOf((ipAddr & 0x0000FFFF) >>> 8));  
		sb.append(".");  
		sb.append(String.valueOf((ipAddr & 0x000000FF)));  
		return sb.toString();  
	} 
	//String IP to Long
	public  long iPStr2Long(String strIPAddr) {  
		long[] ip = new long[4];
		int pos1 = strIPAddr.indexOf(".");  
		int pos2 = strIPAddr.indexOf(".", pos1 + 1);  
		int pos3 = strIPAddr.indexOf(".", pos2 + 1);  
		ip[0] = Long.parseLong(strIPAddr.substring(0, pos1));  
		ip[1] = Long.parseLong(strIPAddr.substring(pos1+1, pos2));  
		ip[2] = Long.parseLong(strIPAddr.substring(pos2+1, pos3));  
		ip[3] = Long.parseLong(strIPAddr.substring(pos3+1));  
		return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];  
	}  
	//IP INT to String
	public String iPInt2Str(int ipAddr) {  
		StringBuffer sb = new StringBuffer("");  
		sb.append(String.valueOf((ipAddr >>> 24)));  
		sb.append(".");  
		sb.append(String.valueOf((ipAddr & 0x00FFFFFF) >>> 16));  
		sb.append(".");  
		sb.append(String.valueOf((ipAddr & 0x0000FFFF) >>> 8));  
		sb.append(".");  
		sb.append(String.valueOf((ipAddr & 0x000000FF)));  
		return sb.toString();  
	} 
	//String IP to INT
	public  int iPStr2Int(String strIPAddr) {  
		int[] ip = new int[4];
		int pos1 = strIPAddr.indexOf(".");  
		int pos2 = strIPAddr.indexOf(".", pos1 + 1);  
		int pos3 = strIPAddr.indexOf(".", pos2 + 1);  
		ip[0] = Integer.parseInt(strIPAddr.substring(0, pos1));  
		ip[1] = Integer.parseInt(strIPAddr.substring(pos1+1, pos2));  
		ip[2] = Integer.parseInt(strIPAddr.substring(pos2+1, pos3));  
		ip[3] = Integer.parseInt(strIPAddr.substring(pos3+1));  
		return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];  
	}  
	public static void main(String[] args) {
		IPConvertor ipConvertor = new IPConvertor();
		int ipInt = ipConvertor.iPStr2Int("115.173.195.36");
		String strIPInt = ipConvertor.iPInt2Str(-100527956);
		long ipLong = ipConvertor.iPStr2Long("115.173.195.36");
		String strIPLong = ipConvertor.iPLong2Str(-100527956);
		System.out.println(ipInt);
		System.out.println(strIPInt);
		System.out.println(ipLong);
		System.out.println(strIPLong);
	}
}