[ 编码 ]原字节不变信息不变

作者: 一个好汉 | 来源:发表于2021-08-29 00:06 被阅读0次

[ 编码 ]原字节不变信息不变
文笔——仿写
Java-IO流-基本类型数据流-DataOutputStrea
读《论语》――半部《论语》治天下
关于设置 sublime text3 编码格式为utf-8
条件不变≠结果不变
随缘不变，不变随缘。
思维不变，结果不变
随缘不变，不变随缘
过程不变，结果不变

测试在编码转换过程是否会丢失信息

事实证明是会的
但是只要在转换的过程原字节不会发生变化还是可以还原出原来的结果的

/**
     * 编码之间的转换
     *
     * 只要在转换的过程 原字节不会发生变化 还是可以还原出原来的结果的
     */
    public static void conversion() {
        List<String> srcStrings = Arrays.asList("少年", "少µ年", "少");
        Map<Charset, Charset[]> charsetMap = new LinkedHashMap<Charset, Charset[]>(){{
            put(StandardCharsets.UTF_8, new Charset[]{StandardCharsets.UTF_8, new GBK(), StandardCharsets.ISO_8859_1});
            put(new GBK(), new Charset[]{StandardCharsets.UTF_8, new GBK(), StandardCharsets.ISO_8859_1});
            put(StandardCharsets.ISO_8859_1, new Charset[]{StandardCharsets.UTF_8, new GBK(), StandardCharsets.ISO_8859_1});
        }};
        charsetMap.forEach((key, value) -> {
            Arrays.stream(value).forEach(
                    middleCharset->srcStrings.forEach(e -> translate(e, key, middleCharset)));
        });
    }

private static void translate(String src, Charset srcCharset, Charset middleCharset) {
        log.info("src :{}, srcCharset: {}, middleCharset: {}",
                src, srcCharset.name(), middleCharset.name());
        byte[] uBytes = src.getBytes(srcCharset);
        log.info("src bytes:{}",
                HexUtil.encodeHexStr(uBytes));
        String gStr = new String(uBytes, middleCharset);
        log.info("after decode : {}", gStr);
        byte[] afterGbkDecodeBytes = gStr.getBytes(middleCharset);
        log.info("after middle conversion bytes:{}", HexUtil.encodeHexStr(afterGbkDecodeBytes));
        String finalStr = new String(afterGbkDecodeBytes, srcCharset);
        log.info("final String:{}", finalStr);

        if (src.equals(finalStr)) {
            log.error("[equals]--- src :{}, srcCharset: {}, middleCharset: {}",
                    src, srcCharset.name(), middleCharset.name());
        }
    }

结果:

src :少年, srcCharset: UTF-8, middleCharset: UTF-8
src bytes:e5b091e5b9b4
after decode : 少年
after middle conversion bytes:e5b091e5b9b4
final String:少年
[equals]--- src :少年, srcCharset: UTF-8, middleCharset: UTF-8
src :少µ年, srcCharset: UTF-8, middleCharset: UTF-8
src bytes:e5b091c2b5e5b9b4
after decode : 少µ年
after middle conversion bytes:e5b091c2b5e5b9b4
final String:少µ年
[equals]--- src :少µ年, srcCharset: UTF-8, middleCharset: UTF-8
src :少, srcCharset: UTF-8, middleCharset: UTF-8
src bytes:e5b091
after decode : 少
after middle conversion bytes:e5b091
final String:少
[equals]--- src :少, srcCharset: UTF-8, middleCharset: UTF-8
src :少年, srcCharset: UTF-8, middleCharset: GBK
src bytes:e5b091e5b9b4
after decode : 灏戝勾
after middle conversion bytes:e5b091e5b9b4
final String:少年
[equals]--- src :少年, srcCharset: UTF-8, middleCharset: GBK
src :少µ年, srcCharset: UTF-8, middleCharset: GBK
src bytes:e5b091c2b5e5b9b4
after decode : 灏懧靛勾
after middle conversion bytes:e5b091c2b5e5b9b4
final String:少µ年
[equals]--- src :少µ年, srcCharset: UTF-8, middleCharset: GBK
src :少, srcCharset: UTF-8, middleCharset: GBK
src bytes:e5b091
after decode : 灏�
after middle conversion bytes:e5b03f
final String:�?
src :少年, srcCharset: UTF-8, middleCharset: ISO-8859-1
src bytes:e5b091e5b9b4
after decode : å°�å¹´
after middle conversion bytes:e5b091e5b9b4
final String:少年
[equals]--- src :少年, srcCharset: UTF-8, middleCharset: ISO-8859-1
src :少µ年, srcCharset: UTF-8, middleCharset: ISO-8859-1
src bytes:e5b091c2b5e5b9b4
after decode : å°�Âµå¹´
after middle conversion bytes:e5b091c2b5e5b9b4
final String:少µ年
[equals]--- src :少µ年, srcCharset: UTF-8, middleCharset: ISO-8859-1
src :少, srcCharset: UTF-8, middleCharset: ISO-8859-1
src bytes:e5b091
after decode : å°�
after middle conversion bytes:e5b091
final String:少
[equals]--- src :少, srcCharset: UTF-8, middleCharset: ISO-8859-1
src :少年, srcCharset: GBK, middleCharset: UTF-8
src bytes:c9d9c4ea
after decode : ��
after middle conversion bytes:efbfbdefbfbdefbfbdefbfbd
final String:锟斤拷锟斤拷
src :少µ年, srcCharset: GBK, middleCharset: UTF-8
src bytes:c9d93fc4ea
after decode : ��?��
after middle conversion bytes:efbfbdefbfbd3fefbfbdefbfbd
final String:锟斤拷?锟斤拷
src :少, srcCharset: GBK, middleCharset: UTF-8
src bytes:c9d9
after decode : ��
after middle conversion bytes:efbfbdefbfbd
final String:锟斤拷
src :少年, srcCharset: GBK, middleCharset: GBK
src bytes:c9d9c4ea
after decode : 少年
after middle conversion bytes:c9d9c4ea
final String:少年
[equals]--- src :少年, srcCharset: GBK, middleCharset: GBK
src :少µ年, srcCharset: GBK, middleCharset: GBK
src bytes:c9d93fc4ea
after decode : 少?年
after middle conversion bytes:c9d93fc4ea
final String:少?年
src :少, srcCharset: GBK, middleCharset: GBK
src bytes:c9d9
after decode : 少
after middle conversion bytes:c9d9
final String:少
[equals]--- src :少, srcCharset: GBK, middleCharset: GBK
src :少年, srcCharset: GBK, middleCharset: ISO-8859-1
src bytes:c9d9c4ea
after decode : ÉÙÄê
after middle conversion bytes:c9d9c4ea
final String:少年
[equals]--- src :少年, srcCharset: GBK, middleCharset: ISO-8859-1
src :少µ年, srcCharset: GBK, middleCharset: ISO-8859-1
src bytes:c9d93fc4ea
after decode : ÉÙ?Äê
after middle conversion bytes:c9d93fc4ea
final String:少?年
src :少, srcCharset: GBK, middleCharset: ISO-8859-1
src bytes:c9d9
after decode : ÉÙ
after middle conversion bytes:c9d9
final String:少
[equals]--- src :少, srcCharset: GBK, middleCharset: ISO-8859-1
src :少年, srcCharset: ISO-8859-1, middleCharset: UTF-8
src bytes:3f3f
after decode : ??
after middle conversion bytes:3f3f
final String:??
src :少µ年, srcCharset: ISO-8859-1, middleCharset: UTF-8
src bytes:3fb53f
after decode : ?�?
after middle conversion bytes:3fefbfbd3f
final String:?ï¿½?
src :少, srcCharset: ISO-8859-1, middleCharset: UTF-8
src bytes:3f
after decode : ?
after middle conversion bytes:3f
final String:?
src :少年, srcCharset: ISO-8859-1, middleCharset: GBK
src bytes:3f3f
after decode : ??
after middle conversion bytes:3f3f
final String:??
src :少µ年, srcCharset: ISO-8859-1, middleCharset: GBK
src bytes:3fb53f
after decode : ?�?
after middle conversion bytes:3f3f3f
final String:???
src :少, srcCharset: ISO-8859-1, middleCharset: GBK
src bytes:3f
after decode : ?
after middle conversion bytes:3f
final String:?
src :少年, srcCharset: ISO-8859-1, middleCharset: ISO-8859-1
src bytes:3f3f
after decode : ??
after middle conversion bytes:3f3f
final String:??
src :少µ年, srcCharset: ISO-8859-1, middleCharset: ISO-8859-1
src bytes:3fb53f
after decode : ?µ?
after middle conversion bytes:3fb53f
final String:?µ?
src :少, srcCharset: ISO-8859-1, middleCharset: ISO-8859-1
src bytes:3f
after decode : ?
after middle conversion bytes:3f
final String:?