Java 字符串、数值与16进制相互转化

字符串、数值与16进制相互转化

首先创建一个工具类：

package c;

public class DataUtils {

	/*
	 * 字节数组转16进制字符串
	 */
    public static String bytesToHexString(byte[] bArr) {
        if (bArr == null) {
            return null;
        }
        StringBuffer sb = new StringBuffer(bArr.length);
        String sTmp;

        for (int i = 0; i < bArr.length; i++) {
            sTmp = Integer.toHexString(0xFF & bArr[i]);
            if (sTmp.length() < 2)
                sb.append(0);
            sb.append(sTmp);
        }

        return sb.toString();
    }

    /**
     * @param n
     * @Title: intTohex
     * @Description: int型转换成16进制
     * @return: String
     */
    public static String intTohex(int n) {
        StringBuffer s = new StringBuffer();
        String a;
        char[] b = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        while (n != 0) {
            s = s.append(b[n % 16]);
            n = n / 16;
        }
        a = s.reverse().toString();
        if ("".equals(a)) {
            a = "00";
        }
        if (a.length() == 1) {
            a = "0" + a;
        }
        return a;
    }

    /**
     * 字符串转16进制字符串
     *
     * @param strPart
     * @return
     */
    public static String string2HexString(String strPart) {
        StringBuffer hexString = new StringBuffer();
        for (int i = 0; i < strPart.length(); i++) {
            int ch = (int) strPart.charAt(i);
            String strHex = Integer.toHexString(ch);
            hexString.append(strHex);
        }
        return hexString.toString();
    }

    /**
     * 十六进制转字节数组
     *
     * @param src
     * @return
     */
    public static byte[] hexString2Bytes(String src) {
        int l = src.length() / 2;
        byte[] ret = new byte[l];
        for (int i = 0; i < l; i++) {
            ret[i] = (byte) Integer
                    .valueOf(src.substring(i * 2, i * 2 + 2), 16).byteValue();
        }
        return ret;
    }

    /**
     * Hex字符串转byte
     *
     * @param inHex 待转换的Hex字符串
     * @return 转换后的byte
     */
    public static byte hexToByte(String inHex) {
        return (byte) Integer.parseInt(inHex, 16);
    }

    /**
     * hex字符串转byte数组
     *
     * @param inHex 待转换的Hex字符串
     * @return 转换后的byte数组结果
     */
    public static byte[] hexToByteArray(String inHex) {
        int hexlen = inHex.length();
        byte[] result;
        if (hexlen % 2 == 1) {
            //奇数
            hexlen++;
            result = new byte[(hexlen / 2)];
            inHex = "0" + inHex;
        } else {
            //偶数
            result = new byte[(hexlen / 2)];
        }
        int j = 0;
        for (int i = 0; i < hexlen; i += 2) {
            result[j] = hexToByte(inHex.substring(i, i + 2));
            j++;
        }
        return result;
    }

Java 代码：

        byte[] b = {0x12, 0x23, 0x5a};
        // 字节转换为16进制字符串
        String hexStr = bytesToHexString(b);
        System.out.println("hexStr:" + hexStr);
        // int 转 16进制字符串
        String hexStr1 = Integer.toHexString(2345);
        System.out.println("hexStr1:" + hexStr1);
        // 16进制转字节数组
        byte[] c = hexString2Bytes(Integer.toHexString(2345));
        System.out.println("十六进制字节数组：" + c);
        // int 转16进制字符串
        System.out.println(intTohex(2345));
        // int转16进制 后转16进制字节数组
        System.out.println("十六进制字节数组：" + DataUtils.hexToByteArray(Integer.toHexString(2345)));

打印结果：

hexStr:12235a
hexStr1:929
十六进制字节数组：[B@63c12fb0
929
十六进制字节数组：[B@b1a58a3