【Java】String和Date、Timestamp之间的转换

首先，定义一个Format的日期格式：

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

一、String与Date（java.util.Date）互转

        // String ---> Date
        String sinceTime = "2014-01-26 14:34:14";
        Date date = new Date();
        System.out.println("date = " + date);
        try {
            date = df.parse(sinceTime); // 将sinceTime转为date类型
        } catch (ParseException e) {
            System.out.println("sinceTime = " + sinceTime);
        }
        System.out.println("date format = " + date);
        System.out.println("date to long = " + date.getTime());

        // Date ---> String
        String dateStr = "";
        dateStr = df.format(date);
        System.out.println("date String = " + dateStr);

二、String与Timestamp互转

        // String ---> Timestamp
        Timestamp ts = new Timestamp(System.currentTimeMillis());
        String timeStr = "2014-01-26 14:34:14";
        ts = Timestamp.valueOf(timeStr);
        System.out.println("timestamp = " + ts);

        // Timestamp ---> String
        String tsStr = "";
        try {
            // 方法一
            tsStr = df.format(ts);
            System.out.println("Timestamp -> String " + tsStr);
            // 方法二
            tsStr = ts.toString();
            System.out.println("Timestamp -> String " + tsStr);
        } catch (Exception e) {
            e.printStackTrace();
        }

三、Date（ java.util.Date ）和Timestamp互转

        // Timestamp ---> Date
        try {
            date = ts;
            System.out.println("Timestamp -> Date " + date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        // Date ---> Timestamp
        Timestamp ts2 = new Timestamp(date.getTime());
        System.out.println("Date -> Timestamp " + ts2);

参考博客：http://yunnick.iteye.com/blog/1074495