CharsetUtil 的 UTF-32 解码格式

最新推荐文章于 2024-07-19 08:16:23 发布

Henry_Lin_Wind

最新推荐文章于 2024-07-19 08:16:23 发布

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文章标签： Charset UTF-32

本文链接：https://blog.youkuaiyun.com/Henry_Lin_Wind/article/details/87866260

本文探讨了在Netty框架中使用字符解码工具类CharsetUtil的方法，详细介绍了常见的字符集如UTF_8、UTF_16、ISO_8859_1等，并解释了如何通过Charset.forName()方法调用未直接提供的UTF_32。

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在学习Netty的时候用到了 Charset 字符解码工具类

ctx.write(Unpooled.copiedBuffer("Hello, I am client!", CharsetUtil.UTF_8));

从源码中可以看出常用的格式有：UTF_16，UTF_8，ISO_8859_1，US_ASCII。如果需要用到UTF_32，则无法直接调用。

public final class CharsetUtil {

    /**
     * 16-bit UTF (UCS Transformation Format) whose byte order is identified by
     * an optional byte-order mark
     */
    public static final Charset UTF_16 = Charset.forName("UTF-16");

    /**
     * 16-bit UTF (UCS Transformation Format) whose byte order is big-endian
     */
    public static final Charset UTF_16BE = Charset.forName("UTF-16BE");

    /**
     * 16-bit UTF (UCS Transformation Format) whose byte order is little-endian
     */
    public static final Charset UTF_16LE = Charset.forName("UTF-16LE");

    /**
     * 8-bit UTF (UCS Transformation Format)
     */
    public static final Charset UTF_8 = Charset.forName("UTF-8");

    /**
     * ISO Latin Alphabet No. 1, as known as <tt>ISO-LATIN-1</tt>
     */
    public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");

    /**
     * 7-bit ASCII, as known as ISO646-US or the Basic Latin block of the
     * Unicode character set
     */
    public static final Charset US_ASCII = Charset.forName("US-ASCII");
}

进一步查看Charset.forName()方法

public static Charset forName(String charsetName) {
        Charset cs = lookup(charsetName);
        if (cs != null)
            return cs;
        throw new UnsupportedCharsetException(charsetName);
}

CharsetUtil.UTF_32可以由Charset.forName("UTF-32")来替代。

CharsetUtil.UTF_8 = Charset.forName("UTF-32")