convertutil.java

java转换工具

package hfh.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

/*
 * 转换工具类
 * 
 * @author HFH
 */
public class ConvertUtil {

	private ConvertUtil() {

	}

	public final static char[] BCD_2_ASC = "0123456789abcdef".toCharArray();

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// 测试十六进制字符转换为字节
		char achar = 'A';
		System.out.println("字符" + achar + "的byte值为" + ConvertUtil.char2byte(achar));		

	}

	/**
	 * 将字符转换为字节，将十六进制字符串转为字节数组时用
	 * 
	 * @author hfh, 2007-10-25
	 * 
	 * @param achar
	 * @return
	 */
	private static byte char2byte(char achar) {
		byte b = (byte) "0123456789ABCDEF".indexOf(Character.toUpperCase(achar));
		return b;
	}

	/**
	 * 将16进制字符串转换成字节数组
	 * 
	 * @author hfh, 2007-10-25
	 * 
	 * @param hexStr
	 * @return
	 */
	public static final byte[] hexStr2Bytes(String hexStr) {
		int len = (hexStr.length() / 2);
		byte[] result = new byte[len];
		char[] achar = hexStr.toCharArray();
		for (int i = 0; i < len; i++) {
			int pos = i * 2;
			result[i] = (byte) (char2byte(achar[pos]) << 4 | char2byte(achar[pos + 1]));
		}
		return result;
	}

	/**
	 * 将字节数组转换成16进制字符串
	 * 
	 * @author hfh, 2007-10-25
	 * 
	 * @param bArray
	 * @return
	 */
	public static final String bytes2HexStr(byte[] bArray) {
		StringBuffer sb = new StringBuffer(bArray.length);
		String sTemp;
		for (int i = 0; i < bArray.length; i++) {
			sTemp = Integer.toHexString(0xFF & bArray[i]);
			if (sTemp.length() < 2)
				sb.append(0);
			sb.append(sTemp.toUpperCase());
		}
		return sb.toString();
	}

	/**
	 * 将字节数组转换成16进制字符串
	 * 
	 * 各字节间用指定分隔符分隔,便于查看
	 * 
	 * @author hfh, 2007-10-25
	 * 
	 * @param bArray
	 * @param delimiter
	 * @return
	 */
	public static final String bytes2HexStr(byte[] bArray, String delimiter) {
		StringBuffer sb = new StringBuffer(bArray.length);
		String sTemp;
		for (int i = 0; i < bArray.length; i++) {
			sTemp = Integer.toHexString(0xFF & bArray[i]);
			if (sTemp.length() < 2)
				sb.append(0);

			sb.append(sTemp.toUpperCase());

			// 嵌入分隔符
			if (i < bArray.length - 1)
				sb.append(delimiter);
		}
		return sb.toString();
	}

	/**
	 * 将字节数组转换为对象
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param bytes
	 * @return
	 * @throws IOException
	 * @throws ClassNotFoundException
	 */
	public static final Object bytes2Object(byte[] bytes) throws IOException, ClassNotFoundException {
		ByteArrayInputStream in = new ByteArrayInputStream(bytes);
		ObjectInputStream oi = new ObjectInputStream(in);
		Object o = oi.readObject();
		oi.close();
		return o;
	}

	/**
	 * 将可序列化对象转换成字节数组
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param s
	 * @return
	 * @throws IOException
	 */
	public static final byte[] object2Bytes(Serializable s) throws IOException {
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		ObjectOutputStream ot = new ObjectOutputStream(out);
		ot.writeObject(s);
		ot.flush();
		ot.close();
		return out.toByteArray();
	}

	/**
	 * 将可序列化对象转换成16进制字符串
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param s
	 * @return
	 * @throws IOException
	 */
	public static final String object2HexStr(Serializable s) throws IOException {
		return bytes2HexStr(object2Bytes(s));
	}

	/**
	 * 将16进制字符串转换成对象
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param hexStr
	 * @return
	 * @throws IOException
	 * @throws ClassNotFoundException
	 */
	public static final Object hexStr2Object(String hexStr) throws IOException, ClassNotFoundException {
		return bytes2Object(ConvertUtil.hexStr2Bytes(hexStr));
	}

	/**
	 * BCD码转为10进制串(阿拉伯数字串)
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param bytes
	 * @return
	 */
	public static String bcd2DigitStr(byte[] bytes) {
		StringBuffer temp = new StringBuffer(bytes.length * 2);

		for (int i = 0; i < bytes.length; i++) {
			temp.append((byte) ((bytes[i] & 0xf0) >>> 4));
			temp.append((byte) (bytes[i] & 0x0f));
		}
		return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp.toString().substring(1) : temp
				.toString();
	}

	/**
	 * 10进制串转为BCD码
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param asc
	 * @return
	 */
	public static byte[] str2Bcd(String asc) {
		int len = asc.length();
		int mod = len % 2;

		if (mod != 0) {
			asc = "0" + asc;
			len = asc.length();
		}

		byte abt[] = new byte[len];
		if (len >= 2) {
			len = len / 2;
		}

		byte bbt[] = new byte[len];
		abt = asc.getBytes();
		int j, k;

		for (int p = 0; p < asc.length() / 2; p++) {
			if ((abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {
				j = abt[2 * p] - '0';
			} else if ((abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {
				j = abt[2 * p] - 'a' + 0x0a;
			} else {
				j = abt[2 * p] - 'A' + 0x0a;
			}

			if ((abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {
				k = abt[2 * p + 1] - '0';
			} else if ((abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {
				k = abt[2 * p + 1] - 'a' + 0x0a;
			} else {
				k = abt[2 * p + 1] - 'A' + 0x0a;
			}

			int a = (j << 4) + k;
			byte b = (byte) a;
			bbt[p] = b;
		}
		return bbt;
	}

	/**
	 * BCD码转ASC码
	 *
	 * @author hfh, 2007-10-25
	 *
	 * @param bytes
	 * @return
	 */
	public static String bcd2Asc(byte[] bytes) {
		StringBuffer temp = new StringBuffer(bytes.length * 2);

		for (int i = 0; i < bytes.length; i++) {
			int h = ((bytes[i] & 0xf0) >>> 4);
			int l = (bytes[i] & 0x0f);
			temp.append(BCD_2_ASC[h]).append(BCD_2_ASC[l]);
		}
		return temp.toString();
	}
	
	/**
	 * 将字符串转换为布尔值
	 *
	 * @author hfh, 2007-10-26
	 *
	 * @param value
	 * @return
	 */
	public static boolean str2boolean(String value) {
		return value.equalsIgnoreCase("true") || value.equals("1");
	}
	
}