[英]validating IP address with existing range of ip address
我需要檢查IP地址是否位於IP范圍內。
例如10-20.3.5.6包含IP作為
10.3.5.6 11.3.5.6。 。 。 20.3.5.6
我需要知道以下幾點:
1)1-10.0-255.0.0-255是我在DB中擁有的IP范圍。 我需要檢查IP“ 10.0.7.8”是否在上述指定范圍內。
2)考慮另一種情況是我在DB中有10-20.10-20.10-20.10-20。 我需要檢查10-20.10.10-30.10-50范圍內的任何IP是否在上述范圍內?
讓我們嘗試這樣的事情...
ArrayList<String> IPlist = getIPTable(); //IPTable has entries
Pair IPranges[4] = new Pair[4]();
//Pair isa class that holds two things, like numbers;
//parse your DB entries into the IPranges
IPranges[0].low = 10; IPranges[0].hi = 20;
IPranges[1].low = 3; IPranges[1].hi = 3;
IPranges[2].low = 5; IPranges[2].hi = 5;
IPranges[3].low = 6; IPranges[3].hi = 6;
for(String IP : IPlist)
{
String octet[4]; //read the octets in the String[] octet using substring();
boolean continue = true;
for(int i = 0 ; i < 4 && continue; i++)
if(Integer.parseInt(octet[i]) >= IPtable[i].low && Integer.parseInt(octet[i]) <= IPtable[i].hi)
{
//this is good, do stuff here
}
else
continue = false; //the IP failed to pass the filter, no need to process the rest of it
//safely add the IP to the lsit of valid IPs.
validIP.add(IP);
}
private class Pair
{
public int low, hi;
public Pair(int low, int hi)
{
this.low = low; this.hi = hi;
}
} //feel free to extend this class to do the checking for you.
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