JavaSE-字符串编码-URL-转换ChangeCharset

package charset;
import java.io.UnsupportedEncodingException;
 
 
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，也叫做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，Litter Endian（最高地址存放地位字节）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";
 
	public static final String GB2312 = "GB2312";
 
	/** 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     */
	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     */
	public String toUTF_8(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_8);
	}
 
	/** 将字符编码转换成UTF-16BE     */
	public String toUTF_16BE(String str) throws UnsupportedEncodingException{
		return this.changeCharset(str, UTF_16BE);
	}
 
	/** 将字符编码转换成UTF-16LE     */
	public String toUTF_16LE(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16LE);
	}
 
	/** 将字符编码转换成UTF-16     */
	public String toUTF_16(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, UTF_16);
	}
 
	/** 将字符编码转换成GBK     */
	public String toGBK(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str, GBK);
	}
 
	/** 将字符编码转换成GB2312     */
	public String toGB2312(String str) throws UnsupportedEncodingException {
		return this.changeCharset(str,GB2312);
	}
 
	/**
     * 字符串编码转换的实现方法
     * @param str    待转换的字符串
     * @param newCharset    目标编码
     */
	public String changeCharset(String str, String newCharset) throws UnsupportedEncodingException {
		if(str != null) {
			//用默认字符编码解码字符串。与系统相关，中文windows默认为GB2312
			byte[] bs = str.getBytes();
			return new String(bs, newCharset);    //用新的字符编码生成字符串
		}
		return null;
	}
 
	/**
     * 字符串编码转换的实现方法
     * @param str    待转换的字符串
     * @param oldCharset    源字符集
     * @param newCharset    目标字符集
     */
	public String changeCharset(String str, String oldCharset, String newCharset) throws UnsupportedEncodingException {
		if(str != null) {
			//用源字符编码解码字符串
			byte[] bs = str.getBytes(oldCharset);
			return new String(bs, newCharset);
		}
		return null;
	}
 
	/**
	 * URL处理
	 */
	public static String getURLEncoderString(String str) {
		String result = "";
		if (null == str) {
			return "";
		}
		try {
			result = java.net.URLEncoder.encode(str, "gb2312");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return result;
	}
 
	public static String URLDecoderString(String str) {
		String result = "";
		if (null == str) {
			return "";
		}
		try {
			result = java.net.URLDecoder.decode(str, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return result;
	}
 
}