java 日期转换工具

package com.example.statistics.util;

import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

@Component
public class DateUtil {

    
    public String getDateStrByTime(Long time, String format) {
        TimeZone timeZoneSH = TimeZone.getTimeZone("Asia/Shanghai");
        SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.CHINA);
        sdf.setTimeZone(timeZoneSH);
        Date date;
        String dateStr = "";
        try {
            if (time != null){
                date = sdf.parse(sdf.format(time));
                dateStr = sdf.format(date);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return date