utils.java

论坛软件系统亦称电子公告板(BBS)系统

package cn.jsprun.utils;

import java.io.UnsupportedEncodingException;
public class Utils {
    public static byte[] getIpByteArrayFromString(String ip) {
        byte[] ret = new byte[4];
        java.util.StringTokenizer st = new java.util.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) {
        }
        return ret;
    }
    
    public static String getString(String s, String srcEncoding, String destEncoding) {
        try {
            return new String(s.getBytes(srcEncoding), destEncoding);
        } catch (UnsupportedEncodingException e) {
            return s;
        }
    }
    
    public static String getString(byte[] b, String encoding) {
        try {
            return new String(b, encoding);
        } catch (UnsupportedEncodingException e) {
            return new String(b);
        }
    }
    
    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);
        }
    }
    public static String getIpStringFromBytes(byte[] ip) {
    	StringBuffer sb = new StringBuffer();
    	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();
    }
}