Question

java中 hex 转换成字符串 怎么转

Answer 1

public class Test {
    private static String hexString = "0123456789ABCDEFabcdef";
    public static void main(String[] args) {
        String msg= "亲，你好";
        System.out.println(encode(msg));
        System.out.println(decode(encode(msg)));
    }

    public static String encode(String str) {
        byte[] bytes = str.getBytes();
        StringBuilder sb = new StringBuilder(bytes.length * 2);
        //转换hex编码
        for (byte b : bytes) {
            sb.append(Integer.toHexString(b + 0x800).substring(1));
        }
        str = sb.toString();
        return str;
    }
    //把hex编码转换为string
    public static String decode(String bytes) {
        bytes = bytes.toUpperCase();
        ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length() / 2);
        // 将每2位16进制整数组装成一个字节
        for (int i = 0; i < bytes.length(); i += 2)
            baos.write((hexString.indexOf(bytes.charAt(i)) << 4 | hexString.indexOf(bytes.charAt(i + 1))));
        return new String(baos.toByteArray());
    }
}

Answer 2

private static String hexString = "0123456789ABCDEF";
public static void main(String[] args) {
System.out.println(encode("中文"));
System.out.println(decode(encode("中文")));
}
/*
* 将字符串编码成16进制数字,适用于所有字符（包括中文）
*/
public static String encode(String str) {
// 根据默认编码获取<a href="https://www.baidu.com/s?wd=%E5%AD%97%E8%8A%82%E6%95%B0%E7%BB%84&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Ydn1D4nWDvuWN9mvRvnWDv0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHT4rjR3n101njc4PHnLrHTYPs" target="_blank" class="baidu-highlight">字节数组</a>
byte[] bytes = str.getBytes();
StringBuilder sb = new StringBuilder(bytes.length * 2);
// 将<a href="https://www.baidu.com/s?wd=%E5%AD%97%E8%8A%82%E6%95%B0%E7%BB%84&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Ydn1D4nWDvuWN9mvRvnWDv0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHT4rjR3n101njc4PHnLrHTYPs" target="_blank" class="baidu-highlight">字节数组</a>中每个字节拆解成2位16进制整数
for (int i = 0; i < bytes.length; i++) {
sb.append(hexString.charAt((bytes[i] & 0xf0) >> 4));
sb.append(hexString.charAt((bytes[i] & 0x0f) >> 0));
}
return sb.toString();
}

/*
* 将16进制数字解码成字符串,适用于所有字符（包括中文）
*/
public static String decode(String bytes) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length() / 2);
// 将每2位16进制整数组装成一个字节
for (int i = 0; i < bytes.length(); i += 2)
baos.write((hexString.indexOf(bytes.charAt(i)) << 4 | hexString
.indexOf(bytes.charAt(i + 1))));
return new String(baos.toByteArray());
}

Answer 3

将hex转换为byte，然后再将byte转换为字符串，就可以了