package com.Alex.base;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);         }        }