java对于半角和全角的转换

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本文章转载自：http://www.blogjava.net/action/archive/2006/06/01/49743.html

非常感谢上面链接的文章，在我项目中帮助了我。

方法一：

// 半角转全角public static final String BQchange(String QJstr) {String outStr = "";String Tstr = "";byte[] b = null;for (int i = 0; i< QJstr.length(); i++) {try {Tstr = QJstr.substring(i, i + 1);b = Tstr.getBytes("unicode");} catch (java.io.UnsupportedEncodingException e) {e.printStackTrace();}if (b[3] != -1) {b[2] = (byte) (b[2] - 32);b[3] = -1;try {outStr = outStr + new String(b, "unicode");} catch (java.io.UnsupportedEncodingException e) {e.printStackTrace();}} elseoutStr = outStr + Tstr;}return outStr;}// 全角转半角public static final String QBchange(String QJstr) {String outStr = "";String Tstr = "";byte[] b = null;for (int i = 0; i< QJstr.length(); i++) {try {Tstr = QJstr.substring(i, i + 1);b = Tstr.getBytes("unicode");} catch (java.io.UnsupportedEncodingException e) {e.printStackTrace();}if (b[3] == -1) {b[2] = (byte) (b[2] + 32);b[3] = 0;try {outStr = outStr + new String(b, "unicode");} catch (java.io.UnsupportedEncodingException e) {e.printStackTrace();}} elseoutStr = outStr + Tstr;}return outStr;}}

方法二：

//  转全角的函数(SBC case)// 任意字符串// 全角字符串// 全角空格为12288，半角空格为32// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248public static String ToSBC(String input) {// 半角转全角：char[] c = input.toCharArray();for (int i = 0; i< c.length; i++) {if (c[i] == 32) {c[i] = (char) 12288;continue;}if (c[i]< 127)c[i] = (char) (c[i] + 65248);}return new String(c);}// 转半角的函数(DBC case)// 任意字符串// 半角字符串// 全角空格为12288，半角空格为32// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248public static String ToDBC(String input) {//全角转半角char[] c = input.toCharArray();for (int i = 0; i< c.length; i++) {if (c[i] == 12288) {c[i] = (char) 32;continue;}if (c[i]> 65280&& c[i]< 65375)c[i] = (char) (c[i] - 65248);}return new String(c);}

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