XinYu_RZMES/.svn/pristine/c8/c84d04c5f31777e9e8e3055929c8bfcfe344eda9.svn-base

package xin.glue.cargocnHttpClient;

import java.io.UnsupportedEncodingException;

/**
 * 转换字符串的编码
 * 
 * @author KangMiao
 * @Date 2015-4-15 13:55:56
 * 
 */
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 static String toASCII(String str)
			throws UnsupportedEncodingException {
		return changeCharset(str, US_ASCII);
	}

	/**
	 * 将字符编码转换成ISO-8859-1码
	 */
	public static String toISO_8859_1(String str)
			throws UnsupportedEncodingException {
		return changeCharset(str, ISO_8859_1);
	}

	/**
	 * 将字符编码转换成UTF-8码
	 */
	public static String toUTF_8(String str)
			throws UnsupportedEncodingException {
		return changeCharset(str, UTF_8);
	}

	/**
	 * 将字符编码转换成UTF-16BE码
	 */
	public static String toUTF_16BE(String str)
			throws UnsupportedEncodingException {
		return changeCharset(str, UTF_16BE);
	}

	/**
	 * 将字符编码转换成UTF-16LE码
	 */
	public static String toUTF_16LE(String str)
			throws UnsupportedEncodingException {
		return changeCharset(str, UTF_16LE);
	}

	/**
	 * 将字符编码转换成UTF-16码
	 */
	public static String toUTF_16(String str)
			throws UnsupportedEncodingException {
		return changeCharset(str, UTF_16);
	}

	/**
	 * 将字符编码转换成GBK码
	 */
	public static String toGBK(String str) throws UnsupportedEncodingException {
		return 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 static 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 static 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;
	}

	/**
	 * 字符串编码转换unicode
	 * @param str 待转换编码的字符串
	 * @return
	 */
	public static String stringToUnicode(String s) {
	    String unicode = "";
	    char[] charAry = new char[s.length()];
	    for(int i=0; i<charAry.length; i++) {
		    charAry[i] = (char)s.charAt(i);
		    unicode+="\\u" + Integer.toString(charAry[i], 16);
	    }
	    return unicode;
	}
	/**
	 * unicode编码转换字符串
	 * @param str 待转换编码的字符串
	 * @return
	 */
	public static String unicodeToString(String unicodeStr){
	   StringBuffer sb = new StringBuffer();
	   String str[] = unicodeStr.toUpperCase().split("\\\\U");
	   for(int i=0;i<str.length;i++){
		    if(str[i].equals("")) 
		    	continue;
	    	char c = (char)Integer.parseInt(str[i].trim(),16);
		    sb.append(c);
	   }
	   return sb.toString();
	}
	
	public static void main(String[] args) throws UnsupportedEncodingException {
		String str = "This is a 中文的 String!";
		System.out.println("str: " + str);
		String unicode = ChangeCharset.stringToUnicode(str);
		System.out.println("转换成unicode码: " + unicode);
		System.out.println(unicode.startsWith("\\u"));
		String unicodeTostr = ChangeCharset.unicodeToString(unicode);
		System.out.println("unicode转换成字符串: " + unicodeTostr);
		System.out.println();
		String gbk = ChangeCharset.toGBK(str);
		System.out.println("转换成GBK码: " + gbk);
		System.out.println();
		String ascii = ChangeCharset.toASCII(str);
		System.out.println("转换成US-ASCII码: " + ascii);
		gbk = ChangeCharset.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 = ChangeCharset.toISO_8859_1(str);
		System.out.println("转换成ISO-8859-1码: " + iso88591);
		gbk = ChangeCharset.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 = ChangeCharset.toUTF_8(str);
		System.out.println("转换成UTF-8码: " + utf8);
		gbk = ChangeCharset.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 = ChangeCharset.toUTF_16BE(str);
		System.out.println("转换成UTF-16BE码:" + utf16be);
		gbk = ChangeCharset.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 = ChangeCharset.toUTF_16LE(str);
		System.out.println("转换成UTF-16LE码:" + utf16le);
		gbk = ChangeCharset.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 = ChangeCharset.toUTF_16(str);
		System.out.println("转换成UTF-16码:" + utf16);
		gbk = ChangeCharset.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);
	}
}