效果：

程式碼部分：

public static void main(String[] args) {
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
    String beforedate=sdf.format(new Date());
    System.out.println("轉換之前："+beforedate);
    String enddate=dataToUpper(beforedate);
    System.out.println("轉換之後："+enddate);
}
// 日期轉化為大小寫
public static String dataToUpper(String dateString) {
 
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    Date dateTime = null;
    try {
        dateTime = simpleDateFormat.parse(dateString);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    Calendar ca = Calendar.getInstance();
    ca.setTime(dateTime);
    int year = ca.get(Calendar.YEAR);
 
    int month = ca.get(Calendar.MONTH) + 1;
    int day = ca.get(Calendar.DAY_OF_MONTH);
    return numToUpper(year) + "年" + monthToUppder(month) + "月" + dayToUppder(day) + "日";
}

// 將數字轉化為大寫（字型格式可自己定義）
public static String numToUpper(int num) {
    //String u[] = {"零","壹","貳","叄","肆","伍","陸","柒","捌","玖"};
    String u[] = {"零","一","二","三","四","五","六","七","八","九"};
 
    char[] str = String.valueOf(num).toCharArray();
    String rstr = "";
    for (int i = 0; i < str.length; i++) {
        rstr = rstr + u[Integer.parseInt(str[i] + "")];
    }
    return rstr;
}

// 月轉化為大寫
public static String monthToUppder(int month) {
    if(month < 10) {
        return numToUpper(month);
    } else if(month == 10){
        return "十";
    } else {
        return "十" + numToUpper(month - 10);
    }
}

// 日轉化為大寫
public static String dayToUppder(int day) {
    if(day < 20) {
        return monthToUppder(day);
    } else {
        char[] str = String.valueOf(day).toCharArray();
        if(str[1] == '0') {
            return numToUpper(Integer.parseInt(str[0] + "")) + "十";
        }else {
            return numToUpper(Integer.parseInt(str[0] + "")) + "十" + numToUpper(Integer.parseInt(str[1] + ""));
        }
    }
}