?? utils.java
字號(hào):
package com.briup.run.common.util.ip;
import java.io.UnsupportedEncodingException;
import java.util.StringTokenizer;
public class Utils {
/** IP??????? */
public static String IP_FILE=(Utils.class.getResource("")+"ip.dat").substring(6);
// string buffer
private static StringBuilder sb = new StringBuilder();
/**
* @param ip ip????????????
* @return ????????ip
*/
public static String getIpStringFromBytes(byte[] ip) {
sb.delete(0, sb.length());
sb.append(ip[0] & 0xFF);
sb.append('.');
sb.append(ip[1] & 0xFF);
sb.append('.');
sb.append(ip[2] & 0xFF);
sb.append('.');
sb.append(ip[3] & 0xFF);
return sb.toString();
}
/**
* ??ip?????????????????????
* @param ip ????????ip
* @return ????????????ip
*/
public static byte[] getIpByteArrayFromString(String ip) {
byte[] ret = new byte[4];
StringTokenizer st = new StringTokenizer(ip, ".");
try {
ret[0] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
ret[1] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
ret[2] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
ret[3] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
/**
* ?????????б??????????????????????????
* @param s ?????
* @param srcEncoding ??????
* @param destEncoding ???????
* @return ???????????????????????
*/
public static String getString(String s, String srcEncoding, String destEncoding) {
try {
return new String(s.getBytes(srcEncoding), destEncoding);
} catch (UnsupportedEncodingException e) {
return s;
}
}
/**
* ???????????????????????????
* @param b ???????
* @param offset ?????????λ??
* @param len ?????????
* @param encoding ?????
* @return ???encoding???????????????????????
*/
public static String getString(byte[] b, int offset, int len, String encoding) {
try {
return new String(b, offset, len, encoding);
} catch (UnsupportedEncodingException e) {
return new String(b, offset, len);
}
}
}
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