JAVA UTF-8 GB2312 编码互转

 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;

 public class UnicodeChange {

     //UTF-8->GB2312
     public static String utf8Togb2312(String str){

         StringBuffer sb = new StringBuffer();

         for ( int i=0; i

             char c = str.charAt(i);
             switch (c) {
                case '+' :
                    sb.append( ' ' );
                break ;
                case '%' :
                    try {
                         sb.append(( char )Integer.parseInt (
                         str.substring(i+1,i+3),16));
                    }
                    catch (NumberFormatException e) {
                        throw new IllegalArgumentException();
                   }

                   i += 2;

                   break ;

                default :

                   sb.append(c);

                   break ;

              }

         }

         String result = sb.toString();

         String res= null ;

         try {

              byte [] inputBytes = result.getBytes( "8859_1" );

             res= new String(inputBytes, "UTF-8" );

         }

         catch (Exception e){}

         return res;

   }


     //GB2312->UTF-8
     public static String gb2312ToUtf8(String str) {

         String urlEncode = "" ;

         try {

             urlEncode = URLEncoder.encode (str, "UTF-8" );

         } catch (UnsupportedEncodingException e) {

             e.printStackTrace();

         }

         return urlEncode;

     }


     public static void main(String[] args){

             try {

             String str="輸入簡體字,點下面繁體字按鈕進行在線轉換.";//%E4%B8%AD%E5%9B%BD

             str=gb2312ToUtf8(str);

             System.out.println(str);

             str=utf8Togb2312(str);

             System.out.println(str);

             } catch (Exception e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }


         }



 }

转自：http://blog.csdn.net/thl331860203/article/details/7322505