遍歷字串中的所有字元，判斷是否為中文，如果是中文進行轉碼，如果不是就繼續

/**
	 * 將字串中的中文進行編碼
	 * @param s
	 * @return 返回字串中漢字編碼後的字串
	 */
	private String cnToEncode(String s ){
		char[] ch = s.toCharArray();
		String result = "";
		for(int i=0;i<ch.length;i++){
			char temp = ch[i];
			if(isChinese(temp)){
				try {
					String encode = URLEncoder.encode(String.valueOf(temp), "utf-8");
					result = result + encode;
				} catch (UnsupportedEncodingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}else{
				result = result+temp;
			}
		}
		return result;
	}
 

/**
	 * 判斷字元是否為漢字
	 * @param c
	 * @return
	 */
	 private static boolean isChinese(char c) {
	        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
	        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
	                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
	                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
	                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) {
	            return true;
	        }
	        return false;
	  }
 

呼叫：
s = cnToEncode（s）;