utils.java

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package com.briup.run.common.ip;

import java.io.UnsupportedEncodingException;
import java.util.StringTokenizer;

public class Utils {
	/** IP鏁版嵁搴撴枃浠� */
	public static String IP_FILE=("/"+Utils.class.getResource("")+"ip.dat").substring(6);
	//	 string buffer
    private static StringBuilder sb = new StringBuilder();
	
	 /**
     * @param ip ip鐨勫瓧鑺傛暟缁勫舰寮�
     * @return 瀛楃涓插舰寮忕殑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();
    }
    
    /**
     * 浠巌p鐨勫瓧绗︿覆褰㈠紡寰楀埌瀛楄妭鏁扮粍褰㈠紡
     * @param ip 瀛楃涓插舰寮忕殑ip
     * @return 瀛楄妭鏁扮粍褰㈠紡鐨刬p
     */
    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;
    }
    /**
     * 瀵瑰師濮嬪瓧绗︿覆杩涜缂栫爜杞崲锛屽鏋滃け璐ワ紝杩斿洖鍘熷鐨勫瓧绗︿覆
     * @param s 鍘熷瀛楃涓�
     * @param srcEncoding 婧愮紪鐮佹柟寮�
     * @param destEncoding 鐩爣缂栫爜鏂瑰紡
     * @return 杞崲缂栫爜鍚庣殑瀛楃涓诧紝澶辫触杩斿洖鍘熷瀛楃涓�
     */
    public static String getString(String s, String srcEncoding, String destEncoding) {
        try {
            return new String(s.getBytes(srcEncoding), destEncoding);
        } catch (UnsupportedEncodingException e) {
            return s;
        }
    }
    /**
     * 鏍规嵁鏌愮缂栫爜鏂瑰紡灏嗗瓧鑺傛暟缁勮浆鎹㈡垚瀛楃涓�
     * @param b 瀛楄妭鏁扮粍
     * @param offset 瑕佽浆鎹㈢殑璧峰浣嶇疆
     * @param len 瑕佽浆鎹㈢殑闀垮害
     * @param encoding 缂栫爜鏂瑰紡
     * @return 濡傛灉encoding涓嶆敮鎸侊紝杩斿洖涓�涓己鐪佺紪鐮佺殑瀛楃涓�
     */
    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);
        }
    }
}