获取GB2312编码所有汉字

private static final Charset CHARSET = Charset.forName("GB2312");

    /**
     * 获取GB2312所有汉字
     * “高位字节”的范围是0xB0-0xF7，“低位字节”的范围是0xA0-0xFE
     */
    private static List<String> getGB2312() {
        List<String> words = new ArrayList<>();
        byte[] bytes = new byte[2];
        for (int b1 = 176; b1 < 248; b1++) {
            bytes[0] = (byte) b1;
            for (int b2 = 161; b2 < 255; b2++) {
                bytes[1] = (byte) b2;
                words.add(new String(bytes, CHARSET));
            }
        }
        return words;
    }

    /**
     * 对于gb2312来讲,首字节码位从0×81至0×FE，尾字节码位分别是0×40至0×FE
     */
    public static boolean isGB2312(String str) {
        boolean isGB2312 = false;
        char[] chars = str.toCharArray();
        for (char c : chars) {
            byte[] bytes = ("" + c).getBytes(CHARSET);
            if (bytes.length == 2) {
                int[] ints = new int[2];
                ints[0] = bytes[0] & 0xff;
                ints[1] = bytes[1] & 0xff;
                if (ints[0] >= 0x81 && ints[0] <= 0xFE && ints[1] >= 0x40 && ints[1] <= 0xFE) {
                    isGB2312 = true;
                    break;
                }
            }
        }
        return isGB2312;
    }