序
本文展示一下如何将char进行半角与全角转换。
术语
全角
- SBC case
- Sexagesimal to Binary Converter
- 60进制转为2进制
半角
- DBC case
- Decimal to Binary Converter
- 10进制转为2进制
工具类
public class AsciiUtil {
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;
public static final char ASCII_END = 126;
public static final char UNICODE_START = 65281;
public static final char UNICODE_END = 65374;
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
*
* @param src
* @return DBC case
*/
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.
*
* @param src
* @return SBC case string
*/
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);
}
}
验证
@Test
public void testDBC(){
System.out.println(AsciiUtil.sbc2dbcCase("ｈｅｌｌｏ ｗｏｒｌｄ"));
System.out.println(AsciiUtil.dbc2sbcCase("hello world"));
}
输出
hello world
ｈｅｌｌｏ ｗｏｒｌｄ
