java编码转化方案-备用

 import java.io.UnsupportedEncodingException;

 /**
  * 转换字符串的编码
  */
 public class changeCharSet {
  /** 7位ASCII字符，也叫作ISO646-US、Unicode字符集的基本拉丁块 */
  public static final String US_ASCII = "US-ASCII";

  /** ISO 拉丁字母表 No.1，也叫作 ISO-LATIN-1 */
  public static final String ISO_8859_1 = "ISO-8859-1";

  /** 8 位 UCS 转换格式 */
  public static final String UTF_8 = "UTF-8";

  /** 16 位 UCS 转换格式，Big Endian（最低地址存放高位字节）字节顺序 */
  public static final String UTF_16BE = "UTF-16BE";

  /** 16 位 UCS 转换格式，Little-endian（最高地址存放低位字节）字节顺序 */
  public static final String UTF_16LE = "UTF-16LE";

  /** 16 位 UCS 转换格式，字节顺序由可选的字节顺序标记来标识 */
  public static final String UTF_16 = "UTF-16";

  /** 中文超大字符集 */
  public static final String GBK = "GBK";

  /**
   * 将字符编码转换成US-ASCII码
   */
  public String toASCII(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, US_ASCII);
  }
  /**
   * 将字符编码转换成ISO-8859-1码
   */
  public String toISO_8859_1(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, ISO_8859_1);
  }
  /**
   * 将字符编码转换成UTF-8码
   */
  public String toUTF_8(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, UTF_8);
  }
  /**
   * 将字符编码转换成UTF-16BE码
   */
  public String toUTF_16BE(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, UTF_16BE);
  }
  /**
   * 将字符编码转换成UTF-16LE码
   */
  public String toUTF_16LE(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, UTF_16LE);
  }
  /**
   * 将字符编码转换成UTF-16码
   */
  public String toUTF_16(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, UTF_16);
  }
  /**
   * 将字符编码转换成GBK码
   */
  public String toGBK(String str) throws UnsupportedEncodingException{
   return this.changeCharSet(str, GBK);
  }

  /**
   * 字符串编码转换的实现方法
   * @param str  待转换编码的字符串
   * @param newCharset 目标编码
   * @return
   * @throws UnsupportedEncodingException
   */
  public String changeCharSet(String str, String newCharset)
    throws UnsupportedEncodingException {
   if (str != null) {
    //用默认字符编码解码字符串。
    byte[] bs = str.getBytes();
    //用新的字符编码生成字符串
    return new String(bs, newCharset);
   }
   return null;
  }
  /**
   * 字符串编码转换的实现方法
   * @param str  待转换编码的字符串
   * @param oldCharset 原编码
   * @param newCharset 目标编码
   * @return
   * @throws UnsupportedEncodingException
   */
  public String changeCharSet(String str, String oldCharset, String newCharset)
    throws UnsupportedEncodingException {
   if (str != null) {
    //用旧的字符编码解码字符串。解码可能会出现异常。
    byte[] bs = str.getBytes(oldCharset);
    //用新的字符编码生成字符串
    return new String(bs, newCharset);
   }
   return null;
  }

  public static void main(String[] args) throws UnsupportedEncodingException {
   changeCharSet test = new changeCharSet();
   String str = "This is a 中文的 String!";
   System.out.println("str: " + str);
   String gbk = test.toGBK(str);
   System.out.println("转换成GBK码: " + gbk);
   System.out.println();
   String ascii = test.toASCII(str);
   System.out.println("转换成US-ASCII码: " + ascii);
   gbk = test.changeCharSet(ascii,changeCharSet.US_ASCII, changeCharSet.GBK);
   System.out.println("再把ASCII码的字符串转换成GBK码: " + gbk);
   System.out.println();
   String iso88591 = test.toISO_8859_1(str);
   System.out.println("转换成ISO-8859-1码: " + iso88591);
   gbk = test.changeCharSet(iso88591,changeCharSet.ISO_8859_1, changeCharSet.GBK);
   System.out.println("再把ISO-8859-1码的字符串转换成GBK码: " + gbk);
   System.out.println();
   String utf8 = test.toUTF_8(str);
   System.out.println("转换成UTF-8码: " + utf8);
   gbk = test.changeCharSet(utf8,changeCharSet.UTF_8, changeCharSet.GBK);
   System.out.println("再把UTF-8码的字符串转换成GBK码: " + gbk);
   System.out.println();
   String utf16be = test.toUTF_16BE(str);
   System.out.println("转换成UTF-16BE码:" + utf16be);
   gbk = test.changeCharSet(utf16be,changeCharSet.UTF_16BE, changeCharSet.GBK);
   System.out.println("再把UTF-16BE码的字符串转换成GBK码: " + gbk);
   System.out.println();
   String utf16le = test.toUTF_16LE(str);
   System.out.println("转换成UTF-16LE码:" + utf16le);
   gbk = test.changeCharSet(utf16le,changeCharSet.UTF_16LE, changeCharSet.GBK);
   System.out.println("再把UTF-16LE码的字符串转换成GBK码: " + gbk);
   System.out.println();
   String utf16 = test.toUTF_16(str);
   System.out.println("转换成UTF-16码:" + utf16);
   gbk = test.changeCharSet(utf16,changeCharSet.UTF_16LE, changeCharSet.GBK);
   System.out.println("再把UTF-16码的字符串转换成GBK码: " + gbk);
   String s = new String("中文".getBytes("UTF-8"),"UTF-8");
   System.out.println(s);
  }
 }