java中實現全角半角轉換

 public class Test {
        public static void main(String[] args) {
                String QJstr = "hello";
                String QJstr1 = "ｈｅｈｅ";

                String result = BQchange(QJstr);
                String result1 = QBchange(QJstr1);

                System.out.println(QJstr + "/n" + result);
                System.out.println(QJstr1 + "/n" + result1);
        }

        // 半角轉全角
        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();
                                }
                        } else
                                outStr = outStr + Tstr;
                }
                return outStr;
        }

        // 全角轉半角
        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();
                                }
                        } else
                                outStr = outStr + Tstr;
                }
                return outStr;
        }
}