\x 的解碼

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\xE4\xBD\xA0\xE5\xA5\xBD 解碼
感謝 http://www.bejson.com/convert/ox2str/

p e4 bd a0
P -100 -61 -32
P 11100100 10111101 10100000
J -28 -67 -96
J 10011100 11000011 11100000

p e5 a5 bd
P -101 -37 -61
P 11100101 10100101 10111101
J -27 -91 -67
J 10011011 11011011 11000011

Java:你好[-28, -67, -96, -27, -91, -67]

\xE4\xBD\xA0\xE5\xA5\xBD –> e4bda0e5a5bd –> 你好

與python的關係

python2

普通字符串常量,默認utf-8
    >>> a = 'aa'
    >>> type(a[0])
    <type 'str'>


bytes
    >>> bytes #（str == bytes）爲 Ture
    <type 'str'>

bytearray
    <type 'bytearray'>

    r'xxx';
        非轉義的原始字符串 
    u'xxx';
        不是僅僅是針對中文, 可以針對任何的字符串，代表是對字符串進行unicode編碼。

python3

普通字符串常量 <class 'str'>,默認unicode
    >>> a = 'aa'
    >>> type(a[0])
    <class 'str'>
bytes ：<class 'bytes'>
bytearray：<class 'bytearray'>

    r'xxx';
    u'xxx';
    b'xxx';
        python3.x裏默認的str是unicode, bytes是(py2.x)的str, b”“前綴代表的就是bytes 
        python2.x裏, b前綴沒什麼具體意義， 只是爲了兼容python3.x的這種寫法

HBase中取出來了字符串中文不能直接顯示

所有這裏實現瞭解析\x中文 英文字符集 混合編碼，，，

   #-*-coding:utf-8-*-

# python2 實現

def dvstr(r):
    barr = bytearray();
    rlen = len(r);
    i = 0;
    while i < rlen:
        if r[i] == '\\' and r[i+1] == 'x':
            barr.append(r[i+2])
            barr.append(r[i+3])
            i+=4;
        else:
            hexc = hex(ord(r[i]))
            barr.append(hexc[2])
            barr.append(hexc[3])
            i+=1;
    hexstr = str(barr);
    return hexstr.decode('hex')

def evstr(s):
    barr = bytearray();
    for c in s:
        size = ord(c);
        if size >0 and size < 127:
            barr.append(c)
        else:
            hexc = hex(size)
            barr.append("\\")
            barr.append("x")
            barr.append(hexc[2])
            barr.append(hexc[3])
    return str(barr)

rstr = r'\xe4\xbd\xa0\xe5\xa5\xbd\xe5\x95\x8a121A\xe5\x8f\xb7'
sstr = dvstr(rstr)
print(sstr)
sstr = "你好啊121A號";
rstr = evstr(sstr);
print(rstr)

# python3 實現

def dvstr(r):
    barr = bytearray();
    rlen = len(r);
    i = 0;
    while i < rlen:
        if r[i] == '\\' and r[i+1] == 'x':
            barr.append(ord(r[i+2]))
            barr.append(ord(r[i+3]))
            i+=4;
        else:
            hexc = hex(ord(r[i]))
            barr.append(ord(hexc[2]))
            barr.append(ord(hexc[3]))
            i+=1;
    hexstr = str(barr,'utf-8');
    return bytes.fromhex(hexstr).decode('utf-8')

def evstr(s):
    s = s.encode("UTF-8")
    barr = bytearray();
    for c in s:
        size = c;
        if size >0 and size < 127:
            barr.append(c)
        else:
            hexc = hex(size)
            barr.append(92)# \ 92 x 120
            barr.append(120)
            barr.append(ord(hexc[2]))
            barr.append(ord(hexc[3]))
    return str(barr,'utf-8')

sstr = "你A";
rstr = evstr(sstr);
print(rstr)
rstr = r'\xe4\xbd\xa0A'
sstr = dvstr(rstr)
print(sstr)

java端解碼

    /**
     * @ 解碼字符串
     */
    public static String drstr(String rstr) {
        byte[] bs = rstr.getBytes();
        ByteBuffer buf = ByteBuffer.allocate(bs.length);
        for (int i = 0; i < bs.length; i++) {
            if (bs[i] == 92 && bs[i + 1] == 120) {
                Integer in = Integer.valueOf((char) bs[i + 2] + "" + (char) bs[i + 3], 16);
                in = in & 0xFF;
                buf.put(in.byteValue());
                i += 3;
            } else {
                buf.put(bs[i]);
            }
        }
        return new String(buf.array()).trim();
    }

    /**
     * @ 字符串重編碼
     */
    public static String erstr(String str) {
        final byte[] prefix = "\\x".getBytes();
        ByteBuffer buf = ByteBuffer.allocate(str.length()*24);//
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            if (ch >= 0 && ch <= 127) {
                Integer num = (int) ch;
                buf.put(num.byteValue());
            } else {
                byte[] cbs = String.valueOf(ch).getBytes();
                for (byte b : cbs) {
                    int v = b & 0xFF;
                    String hv = Integer.toHexString(v).toUpperCase();
                    buf.put(prefix);
                    buf.put(hv.getBytes());
                }
            }
        }
        return new String(buf.array()).trim();
    }