4

Stringに含まれる文字が半角か全角か知りたいです。

だから私はそのようにテストしました：

 /* Checking typing password is valid or not.
 * If length of typing password is less than 6 or
 * is greater than 15 or password is composed by full-width character at least one,
 * it will return false.
 * If it is valid, it will return true.
 * @param cmdl
 * @param oldPassword
 * @return
 */
public boolean isValidNewPassword(String password) {

    if ((password.length() < 6)
            || (password.length() > 15) || (isContainFullWidth(password))) {
        return false;
    }

    return true;
}

/**
 * Checking full-width character is included in string.
 * If full-width character is included in string,
 * it will return true.
 * If is not, it will return false.
 * @param cmdl
 * @return
 */
public boolean isContainFullWidth(String cmdl) {
    boolean isFullWidth = false;
    for (char c : cmdl.toCharArray()) {
        if(!isHalfWidth(c)) {
            isFullWidth = true;
            break;
        }
    }

    return isFullWidth;
}

/**
 * Checking character is half-width or not.
 * Unicode value of half-width range:
 * '\u0000' - '\u00FF'
 * '\uFF61' - '\uFFDC'
 * '\uFFE8' - '\uFFEE'
 * If unicode value of character is within this range,
 * it will be half-width character.
 * @param c
 * @return
 */
public boolean isHalfWidth(char c)
{
    return '\u0000' <= c && c <= '\u00FF'
        || '\uFF61' <= c && c <= '\uFFDC'
        || '\uFFE8' <= c && c <= '\uFFEE' ;
}

ただし、全角、半角すべての文字でOKというわけではありません。

それで、この問題について何か提案があれば教えていただけますか？

日本語などのアジア言語では、半角と全角が使用されます。

日本語の文字を書く場合、全角と半角の2種類があります。

半角文字 = ｱﾃﾞﾁｬｴｳｨｵﾌﾟ</p>

全角文字＝アスダファスヂオップ

どうもありがとう！

4

3 に答える 3

1
于 2016-02-27T05:47:09.380 に答える
1

番号を使用すると、このコードを使用できます

    /**
 * Full-angle string conversion half-corner string
 * 1, half-width characters are starting from 33 to 126 end
 * 2, the full-width character corresponding to the half-width character is from 65281 start to 65374 end
 * 3, the half corner of the space is 32. The corresponding Full-width space is 12288
 * The relationship between Half-width and Full-width is obvious, except that the character offset is 65248 (65281-33 = 65248).
 *
 * @param fullWidthStr Non-empty full-width string
 * @return Half-angle string
 */
public String halfWidth2FullWidth(String fullWidthStr) {
    if (null == fullWidthStr || fullWidthStr.length() <= 0) {
        return "";
    }
    char[] arr = fullWidthStr.toCharArray();
    for (int i = 0; i < arr.length; ++i) {
        int charValue = (int) arr[i];
        if (charValue >= 33 && charValue <= 126) {
            arr[i] = (char) (charValue + 65248);
        } else if (charValue == 32) {
            arr[i] = (char) 12288;
        }
    }
    return new String(arr);
}
于 2020-02-19T04:27:41.223 に答える