Java转换全角半角

public class ChangeCode {    public static void main(String[] args) {        String QJstr = "abcdefghijklmnopqrstuvwxyz,.'?";        String QJstr2="ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ";        String result1 = Q2B(QJstr2);        String result2 = B2Q(QJstr);        System.out.println(result1);        System.out.println("\n"+result2);    }    private static String Q2B(String QJstr) {// 全角-->半角        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;    }    private static String B2Q(String QJstr){// 半角-->全角        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();           }            System.out.println(Tstr);            System.out.println("b[0]="+b[0]);            System.out.println("b[1]="+b[1]);            System.out.println("b[2]="+b[2]);            System.out.println("b[3]="+b[3]);            if (b[3] == 0) {                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;    }}