16进制字符转为int类型 16进制转为String类型 tool类

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本文介绍了一个实用的Java工具类，包含十六进制字符串与整数、字节数组之间的转换方法，以及日期格式化和解析的功能。通过这个工具类，可以轻松实现TCP数据包解析中常见的十六进制数据到字符串的转换，同时也提供了从长整型时间戳到特定格式日期字符串的转换。

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package fc.com.utils;

import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ByteForIntUtils {
	
	//将16进制字符转为int类型
	
	public static int getValueFromByte(int[] a)
	{
		int rst = 0;
		for(int i=0; i<a.length; i++)
		{
			rst *= 256;
			rst += a[i];
		}
		return rst;
	}
	
	
	public static int[] getBuff(String str)
	{
		int len = str.length()/2;
		int[] rst = new int[len];
		char [] cstr = str.toUpperCase().toCharArray();
		for(int i=0; i<len; i++)
		{
			rst[i] = (  toByte(cstr[2*i])<<4| toByte(cstr[2*i+1]));
		}
		return rst;
	}

	public static int toByte(char c)
	{
		return ("0123456789ABCDEF".indexOf(c));
	}
	
	
	
	
	
	
	
	
	 public static String longToDate(long lo){
	        Date date = new Date(lo);
	        SimpleDateFormat sd = new SimpleDateFormat("HH:mm:ss");
	        return sd.format(date);
	 }
		
	 public static String longToDates(long lo){
	        Date date = new Date(lo);
	        SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	        return sd.format(date);
	 }
	 public static String getStringDate(Date t) {
		   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		   String dateString = formatter.format(t);
		   return dateString;
		}
	 public static Date strToDate(String strDate) {
		     SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		     ParsePosition pos = new ParsePosition(0);
		     Date strtodate = formatter.parse(strDate, pos);
		     return strtodate;
		  }
	 

	 //TCP16进制转为String
	public static String bytesToHexString(byte[] src, int len) {
		StringBuffer sb = new StringBuffer("");
		if (src == null || src.length <= 0) {
			
		}
		for (int i = 0; i < len; i++) {
			int v = src[i] & 0xFF;
			String hv = Integer.toHexString(v).toUpperCase();
			if (hv.length() < 2) {
				sb.append(0);
			}
			sb.append(hv);
			sb.append(" ");
		}
		return sb.toString().trim();
	}
	 
	 //TCP16进制转为String
	public static String bytesToHexString(byte[] src) {
		StringBuffer sb = new StringBuffer("");
		if (src == null || src.length <= 0) {
			
		}
		for (int i = 0; i < src.length; i++) {
			int v = src[i] & 0xFF;
			String hv = Integer.toHexString(v).toUpperCase();
			if (hv.length() < 2) {
				sb.append(0);
			}
			sb.append(hv);
			if (i != src.length - 1) {
				sb.append(" ");
			}
		}
		return sb.toString();
	}
	
	public static byte[] hexStringToBytes(String hexString) {
		if (hexString == null || hexString.equals("")) {
		return null;
		}
		hexString = hexString.toUpperCase().replace(" ", "");
		int length = hexString.length() / 2;
		char[] hexChars = hexString.toCharArray();
		byte[] d = new byte[length];
		for (int i = 0; i < length; i++) {
		int pos = i * 2;
		d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
		
		}
		return d;
		}
		private static byte charToByte(char c) {
		return (byte) "0123456789ABCDEF".indexOf(c);
		}


	
	
}