src/org/nutz/lang/Strings.java
public static String toHalfWidthString(CharSequence str) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            sb.append(toHalfWidthCharacter(str.charAt(i)));
        }
        return sb.toString();
    }
public static String toHalfWidthString(CharSequence str) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            sb.append(toHalfWidthCharacter(str.charAt(i)));
        }
        return sb.toString();
    }
转换为半角字符串

@param str
待转换字符串
@return 转换后的字符串