Java判断中文及中文字符转unicode

/** 
  * 判断是否为中文字符 
  * @param c 
  * @return 
  */  
public  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.GENERAL_PUNCTUATION  
            || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION  
            || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {  
        return true;  
    }  
    return false;  
}

/** 
  * 把中文转成Unicode码 
  * @param str 
  * @return 
  */  
public String chinaToUnicode(String str){  
     String result="";  
     for (int i = 0; i < str.length(); i++){  
          int chr1 = (char) str.charAt(i);  
          if(chr1>=19968&&chr1<=171941){//汉字范围 \u4e00-\u9fa5 (中文)  
              result+="\\u" + Integer.toHexString(chr1);  
          }else{  
              result+=str.charAt(i);  
          }  
     }  
     return result;  
}