String类型时间转换Date计算时间差

package com.xdja.pki.test.util;

import com.alibaba.fastjson.JSONObject;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author wly
 */
public class TestDate {

    public static void main(String[] args) throws ParseException {

        String ss = "{\"notbefore\":\"2019.11.09 15:09:00\",\"notafter\":\"2022.07.24 15:09:00\"}";
        JSONObject json = JSONObject.parseObject(ss);
        String notafter = json.getString("notafter");
        String notbefore = json.getString("notbefore");
        System.out.println("String类型时间-notafter: " + notafter);
        System.out.println("String类型时间-notbefore:" + notbefore);
        //注意格式 yyyy.MM.dd HH:mm:ss 和 String 类型对应
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
        Date parse1 = sdf.parse(notafter);
        Date parse2 = sdf.parse(notbefore);
        int timeSize = (int) ((sdf.parse(notafter).getTime() - sdf.parse(notbefore).getTime()) / (1000 * 3600 * 24));
        System.out.println("Date类型时间-notafter: " + parse1);
        System.out.println("Date类型时间-notbefore:" + parse2);
        System.out.println("时间差timeSize: " + timeSize + " 天");

    }
}

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