Java全角半角字符转换

ASCII 编码表：ASCII 编码表

Unicode 编码表：Unicode 编码表

参考博客：https://blog.csdn.net/xyw591238/article/details/51719747

/**
 * 全角、半角转换工具
 */
public class DBCSBCUtil {

    public static final char SBC_SPACE = 12288; // 全角空格 12288

    public static final char DBC_SPACE = 32; // 半角空格 32

    // ASCII character 33-126 <-> unicode 65281-65374
    public static final char ASCII_START = 33; // 可见字符“!”索引

    public static final char ASCII_END = 126; // 可见字符“~”索引

    public static final char UNICODE_START = 65281; // “!”的全角 Unicode 编码表索引

    public static final char UNICODE_END = 65374; // “~”的全角 Unicode 编码表索引

    public static final char DBC_SBC_STEP = 65248; // 全角半角转换间隔

    public static char sbc2dbc(char src){
        if (src == SBC_SPACE) {
            return DBC_SPACE;
        }

        if (src >= UNICODE_START && src <= UNICODE_END) {
            return (char) (src - DBC_SBC_STEP);
        }

        return src;
    }

    /**
     * Convert from SBC case to DBC case
     * 全角转半角
     */
    public static String sbc2dbcCase(String src) {
        if (src == null) {
            return null;
        }
        char[] c = src.toCharArray();
        for (int i = 0; i < c.length; i++) {
            c[i] = sbc2dbc(c[i]);
        }
        return new String(c);
    }

    public static char dbc2sbc(char src){
        if (src == DBC_SPACE) {
            return SBC_SPACE;
        }
        if (src <= ASCII_END) {
            return (char) (src + DBC_SBC_STEP);
        }
        return src;
    }

    /**
     * Convert from DBC case to SBC case.
     * 半角转全角
     */
    public static String dbc2sbcCase(String src) {
        if (src == null) {
            return null;
        }

        char[] c = src.toCharArray();
        for (int i = 0; i < c.length; i++) {
            c[i] = dbc2sbc(c[i]);
        }

        return new String(c);
    }

}