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); }}