java:string2hexString 中文字符转码问题解决

java 中提供了一些字符串转码的工具类，比如：Base64,UrlEncoder & UrlDecoder。但是这些类，真的非常有局限性，转码之后的字符串，往往不能被当成文件路径识别。
于是将 字符串转成16进制的字符串就显得非常有必要了。因为16进制的字符串就是数字以及英文字母a-f组成的。所以，当成路径去解析是完全可以的。

import java.io.UnsupportedEncodingException;
import java.util.Arrays;

/**
 * Created by cat on 2017/8/25.
 */
public class TransStringTool {

    public static void main(String[] args) throws UnsupportedEncodingException, InterruptedException {
        String origin = "你好啊啊啊啊;axxx---===><;";

        byte[] bytes = origin.getBytes();
        String hex = bytesToHexString(bytes);
        System.out.println(Arrays.toString(bytes) + " , " + hex);

        byte[] bb = hexStringToBytes(hex);
        String rr = new String(bb);

        System.err.println(Arrays.toString(bb) + " , " + rr);
        System.err.println("##########################################################");
        System.err.println("##########################################################");

        Thread.sleep(10);

        String result = "origin:" + origin + "\n"
                + "hexStr:" + str2HexStr(origin) + "\n"
                + "reOrigin:" + hexStr2Str(str2HexStr(origin));
        System.out.println(result);
    }

    public static String str2HexStr(String origin) {
        byte[] bytes = origin.getBytes();
        String hex = bytesToHexString(bytes);
        return hex;
    }

    public static String hexStr2Str(String hex) {
        byte[] bb = hexStringToBytes(hex);
        String rr = new String(bb);
        return rr;
    }

    private static String bytesToHexString(byte[] src) {
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || src.length <= 0) {
            return null;
        }
        for (int i = 0; i < src.length; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }

    private static byte[] hexStringToBytes(String hexString) {
        if (hexString == null || hexString.equals("")) {
            return null;
        }
        hexString = hexString.toUpperCase();
        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;
    }

    /**
     * Convert char to byte
     *
     * @param c char
     * @return byte
     */
    private static byte charToByte(char c) {
        return (byte) "0123456789ABCDEF".indexOf(c);
    }

• 这个代码不是完全原创的，也借鉴了网上的部分代码。不过使用起来的效果是极好的。

输出如下：

origin:你好啊啊啊啊;axxx---===><;
hexStr:e4bda0e5a5bde5958ae5958ae5958ae5958a3b617878782d2d2d3d3d3d3e3c3b
reOrigin:你好啊啊啊啊;axxx---===><;