JAva各種文字列符号化変換

import java.io.UnsupportedEncodingException;
/**
 *         
 */
public class ChangeCharset {
 /** 7 ASCII  ，   ISO646-US、Unicode          */
 public static final String US_ASCII = "US-ASCII";
 /** ISO       No.1，    ISO-LATIN-1 */
 public static final String ISO_8859_1 = "ISO-8859-1";
 /** 8   UCS      */
 public static final String UTF_8 = "UTF-8";
 /** 16   UCS     ，Big Endian（          ）     */
 public static final String UTF_16BE = "UTF-16BE";
 /** 16   UCS     ，Little-endian（          ）     */
 public static final String UTF_16LE = "UTF-16LE";
 /** 16   UCS     ，                  */
 public static final String UTF_16 = "UTF-16";
 /**         */
 public static final String GBK = "GBK";
 /**
  *         US-ASCII 
  */
 public String toASCII(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, US_ASCII);
 }
 /**
  *         ISO-8859-1 
  */
 public String toISO_8859_1(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, ISO_8859_1);
 }
 /**
  *         UTF-8 
  */
 public String toUTF_8(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, UTF_8);
 }
 /**
  *         UTF-16BE 
  */
 public String toUTF_16BE(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, UTF_16BE);
 }
 /**
  *         UTF-16LE 
  */
 public String toUTF_16LE(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, UTF_16LE);
 }
 /**
  *         UTF-16 
  */
 public String toUTF_16(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, UTF_16);
 }
 /**
  *         GBK 
  */
 public String toGBK(String str) throws UnsupportedEncodingException{
  return this.changeCharset(str, GBK);
 }
   
 /**
  *             
  * @param str           
  * @param newCharset     
  * @return
  * @throws UnsupportedEncodingException
  */
 public String changeCharset(String str, String newCharset)
   throws UnsupportedEncodingException {
  if (str != null) {
   //            。
      …… 
   byte[] bs = str.getBytes();
   //            
   return new String(bs, newCharset);
  }
  return null;
 }
 /**
  *             
  * @param str           
  * @param oldCharset    
  * @param newCharset     
  * @return
  * @throws UnsupportedEncodingException
  */
 public String changeCharset(String str, String oldCharset, String newCharset)
   throws UnsupportedEncodingException {
  if (str != null) {
   //            。         。
   byte[] bs = str.getBytes(oldCharset);
   //            
   return new String(bs, newCharset);
  }
  return null;
 }
 public static void main(String[] args) throws UnsupportedEncodingException {
  ChangeCharset test = new ChangeCharset();
  String str = "This is a     String!";
  System.out.println("str: " + str);
  String gbk = test.toGBK(str);
  System.out.println("   GBK : " + gbk);
  System.out.println();
  String ascii = test.toASCII(str);
  System.out.println("   US-ASCII : " + ascii);
  gbk = test.changeCharset(ascii,ChangeCharset.US_ASCII, ChangeCharset.GBK);
  System.out.println("  ASCII        GBK : " + gbk);
  System.out.println();
  String iso88591 = test.toISO_8859_1(str);
  System.out.println("   ISO-8859-1 : " + iso88591);
  gbk = test.changeCharset(iso88591,ChangeCharset.ISO_8859_1, ChangeCharset.GBK);
  System.out.println("  ISO-8859-1        GBK : " + gbk);
  System.out.println();
  String utf8 = test.toUTF_8(str);
  System.out.println("   UTF-8 : " + utf8);
  gbk = test.changeCharset(utf8,ChangeCharset.UTF_8, ChangeCharset.GBK);
  System.out.println("  UTF-8        GBK : " + gbk);
  System.out.println();
  String utf16be = test.toUTF_16BE(str);
  System.out.println("   UTF-16BE :" + utf16be);
  gbk = test.changeCharset(utf16be,ChangeCharset.UTF_16BE, ChangeCharset.GBK);
  System.out.println("  UTF-16BE        GBK : " + gbk);
  System.out.println();
  String utf16le = test.toUTF_16LE(str);
  System.out.println("   UTF-16LE :" + utf16le);
  gbk = test.changeCharset(utf16le,ChangeCharset.UTF_16LE, ChangeCharset.GBK);
  System.out.println("  UTF-16LE        GBK : " + gbk);
  System.out.println();
  String utf16 = test.toUTF_16(str);
  System.out.println("   UTF-16 :" + utf16);
  gbk = test.changeCharset(utf16,ChangeCharset.UTF_16LE, ChangeCharset.GBK);
  System.out.println("  UTF-16        GBK : " + gbk);
  String s = new String("  ".getBytes("UTF-8"),"UTF-8");
  System.out.println(s);
 }
}