萬能java字串編碼轉換工具類

package com.zuidaima.util;
 
import java.io.UnsupportedEncodingException;
 
/**
 * 轉換字串的編碼
 */
public class ChangeCharset {
	/** 7位ASCII字元，也叫作ISO646-US、Unicode字符集的基本拉丁塊 */
	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 轉換格式 */
	public static final String UTF_8 = "UTF-8";
 
	/** 16 位 UCS 轉換格式，Big Endian（最低地址存放高位位元組）位元組順序 */
	public static final String UTF_16BE = "UTF-16BE";
 
	/** 16 位 UCS 轉換格式，Little-endian（最高地址存放低位位元組）位元組順序 */
	public static final String UTF_16LE = "UTF-16LE";
 
	/** 16 位 UCS 轉換格式，位元組順序由可選的位元組順序標記來標識 */
	public static final String UTF_16 = "UTF-16";
 
	/** 中文超大字符集 */
	public static final String GBK = "GBK";
 
	/**
	 * 將字元編碼轉換成US-ASCII碼
	 */
	public String toASCII(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, US_ASCII);
	}
 
	/**
	 * 將字元編碼轉換成ISO-8859-1碼
	 */
	public String toISO_8859_1(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, ISO_8859_1);
	}
 
	/**
	 * 將字元編碼轉換成UTF-8碼
	 */
	public String toUTF_8(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_8);
	}
 
	/**
	 * 將字元編碼轉換成UTF-16BE碼
	 */
	public String toUTF_16BE(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16BE);
	}
 
	/**
	 * 將字元編碼轉換成UTF-16LE碼
	 */
	public String toUTF_16LE(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16LE);
	}
 
	/**
	 * 將字元編碼轉換成UTF-16碼
	 */
	public String toUTF_16(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16);
	}
 
	/**
	 * 將字元編碼轉換成GBK碼
	 */
	public String toGBK(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, GBK);
	}
 
	/**
	 * 字串編碼轉換的實現方法
	 * 
	 * @param str
	 *            待轉換編碼的字串
	 * @param newCharset
	 *            目標編碼
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String changeCharset(String str, String newCharset)
			throws UnsupportedEncodingException {
		if (str != null) {
			// 用預設字元編碼解碼字串。
			byte[] bs = str.getBytes();
			// 用新的字元編碼生成字串
			return new String(bs, newCharset);
		}
		return null;
	}
 
	/**
	 * 字串編碼轉換的實現方法
	 * 
	 * @param str
	 *            待轉換編碼的字串
	 * @param oldCharset
	 *            原編碼
	 * @param newCharset
	 *            目標編碼
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String changeCharset(String str, String oldCharset, String newCharset)
			throws UnsupportedEncodingException {
		if (str != null) {
			// 用舊的字元編碼解碼字串。解碼可能會出現異常。
			byte[] bs = str.getBytes(oldCharset);
			// 用新的字元編碼生成字串
			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("轉換成GBK碼: " + gbk);
		System.out.println();
		String ascii = test.toASCII(str);
		System.out.println("轉換成US-ASCII碼: " + ascii);
		gbk = test.changeCharset(ascii, ChangeCharset.US_ASCII,
				ChangeCharset.GBK);
		System.out.println("再把ASCII碼的字串轉換成GBK碼: " + gbk);
		System.out.println();
		String iso88591 = test.toISO_8859_1(str);
		System.out.println("轉換成ISO-8859-1碼: " + iso88591);
		gbk = test.changeCharset(iso88591, ChangeCharset.ISO_8859_1,
				ChangeCharset.GBK);
		System.out.println("再把ISO-8859-1碼的字串轉換成GBK碼: " + gbk);
		System.out.println();
		String utf8 = test.toUTF_8(str);
		System.out.println("轉換成UTF-8碼: " + utf8);
		gbk = test.changeCharset(utf8, ChangeCharset.UTF_8, ChangeCharset.GBK);
		System.out.println("再把UTF-8碼的字串轉換成GBK碼: " + gbk);
		System.out.println();
		String utf16be = test.toUTF_16BE(str);
		System.out.println("轉換成UTF-16BE碼:" + utf16be);
		gbk = test.changeCharset(utf16be, ChangeCharset.UTF_16BE,
				ChangeCharset.GBK);
		System.out.println("再把UTF-16BE碼的字串轉換成GBK碼: " + gbk);
		System.out.println();
		String utf16le = test.toUTF_16LE(str);
		System.out.println("轉換成UTF-16LE碼:" + utf16le);
		gbk = test.changeCharset(utf16le, ChangeCharset.UTF_16LE,
				ChangeCharset.GBK);
		System.out.println("再把UTF-16LE碼的字串轉換成GBK碼: " + gbk);
		System.out.println();
		String utf16 = test.toUTF_16(str);
		System.out.println("轉換成UTF-16碼:" + utf16);
		gbk = test.changeCharset(utf16, ChangeCharset.UTF_16LE,
				ChangeCharset.GBK);
		System.out.println("再把UTF-16碼的字串轉換成GBK碼: " + gbk);
		String s = new String("中文".getBytes("UTF-8"), "UTF-8");
		System.out.println(s);
	}
}

輸出結果：