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System.out.println(URLEncoder.encode("a+b c", "UTF-8"));
System.out.println(UrlEscapers.urlFormParameterEscaper().escape("a+b c"));
System.out.println(UrlEscapers.urlFragmentEscaper().escape("a+b c"));
System.out.println(UrlEscapers.urlPathSegmentEscaper().escape("a+b c"));
----
a%2Bb+c
a%2Bb+c
a+b%20c
a+b%20c

public class Unicode{

public static String encode( String s){
    StringBuffer uni_s = new StringBuffer();
    String temp_s = null;
    for( int i=0 ; i < s.length() ; i++){
        temp_s = Integer.toHexString( s.charAt(i) );
        uni_s.append( "\\u"+(temp_s.length()==4 ? temp_s : "00" + temp_s ) );
    }
    return uni_s.toString();
}

public static String decode( String uni){
    StringBuffer str = new StringBuffer();
    for( int i= uni.indexOf("\\u") ; i > -1 ; i = uni.indexOf("\\u") ){    // euc-kr(%u), utf-8(//u)
        str.append( uni.substring( 0, i ) );
        str.append( String.valueOf( (char)Integer.parseInt( uni.substring( i + 2, i + 6 ) ,16) ) );
        uni = uni.substring( i +6);
    }
    str.append( uni );
    return str.toString();
} 


public static void main(String[] args) throws Exception{
	String cmd = args[0];
	if("d".equals(cmd))
		System.out.println(Unicode.decode(args[1]));
	else if("e".equals(cmd))
		System.out.println(Unicode.encode(args[1]));
}

}