转换日期为字符串使用
DateFormat#format方法：
String pattern = "MM/dd/yyyy HH:mm:ss";// Create an instance of SimpleDateFormat used for formatting // the string representation of date according to the chosen patternDateFormat df = new SimpleDateFormat(pattern);// Get the today date using Calendar object.Date today = Calendar.getInstance().getTime(); // Using DateFormat format method we can create a string // representation of a date with the defined format.String todayAsString = df.format(today);// Print the result!System.out.println("Today is: " + todayAsString);
