java判断IP是否在某个网段中 .

[java] view plaincopyprint?
01./** 
02.     * 判断ip是否在指定网段中 
03.     * @author dh 
04.     * @param iparea 
05.     * @param ip 
06.     * @return boolean 
07.     */  
08.    public static boolean ipIsInNet(String iparea, String ip) {  
09.        if (iparea == null)  
10.            throw new NullPointerException("IP段不能为空！");  
11.        if (ip == null)  
12.            throw new NullPointerException("IP不能为空！");  
13.        iparea = iparea.trim();  
14.        ip = ip.trim();  
15.        final String REGX_IP = "((25[0-5]|2[0-4]//d|1//d{2}|[1-9]//d|//d)//.){3}(25[0-5]|2[0-4]//d|1//d{2}|[1-9]//d|//d)";  
16.        final String REGX_IPB = REGX_IP + "//-" + REGX_IP;  
17.        if (!iparea.matches(REGX_IPB) || !ip.matches(REGX_IP))  
18.            return false;  
19.        int idx = iparea.indexOf('-');  
20.        String[] sips = iparea.substring(0, idx).split("//.");  
21.        String[] sipe = iparea.substring(idx + 1).split("//.");  
22.        String[] sipt = ip.split("//.");  
23.        long ips = 0L, ipe = 0L, ipt = 0L;  
24.        for (int i = 0; i < 4; ++i) {  
25.            ips = ips << 8 | Integer.parseInt(sips[i]);  
26.            ipe = ipe << 8 | Integer.parseInt(sipe[i]);  
27.            ipt = ipt << 8 | Integer.parseInt(sipt[i]);  
28.        }  
29.        if (ips > ipe) {  
30.            long t = ips;  
31.            ips = ipe;  
32.            ipe = t;  
33.        }  
34.        return ips <= ipt && ipt <= ipe;  
35.    }