java全角半角间的转换

package test;

import java.util.*;

public class MultiDimArray {
/**  
* 半角全角转换及替换半角全角空白  
* @author maochangming  
*/  

     public static void main(String[] args) throws Exception {   
         try {   
             //去首尾空格，不管是全角半角：   
             String s = "nihaoｈｋ　　　　ｎｉｈｅｈｅ　　　　　";   
             System.out.println("s.length=" + s.length());   
             // s = s.replaceAll("^//s*|//s*$", "");   
             s = s.replaceAll("(^[ |　]*|[ |　]*$)", "");   
             s = s.replaceAll("　", "");   
             System.out.println("s.length=" + s.length());   
             System.out.println("s===" + s);   
   
             String QJstr = "HELLO";   
             String QJstr1 = "ＨＥＬＬＯ";   
   
             String result = BQchange(QJstr);   
             String result1 = QBchange(QJstr1);   
   
             System.out.println(QJstr + "/n" + result);   
             System.out.println(QJstr1 + "/n" + result1);   
         } catch (Exception ex) {   
             throw new Exception("ERROR:" + ex.getMessage());   
         }   
     }   
   
     /**  
      * 半角转全角  
      * @param QJstr  
      * @return  
      */  
     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;   
     }   
   
     /**  
      * 全角转半角  
      * @param QJstr  
      * @return  
      */  
     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;   
     }   
   
}