最近在做判断时间是今天，昨天，明天，在网上找了一个例子用的时候不怎么对，特此出一个自己在之前网上例子中
修改的代码，不想去找原作者就此发一个博客。
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class CalendarTest {
/**
* @param args
*/
public static void main(String[] args) {
String time = formatDateTime("2017-01-17 15:45:30");
System.out.println("time:"+time);
time = formatDateTime("2017-01-16 15:45:30");
System.out.println("time:"+time);
time = formatDateTime("2017-01-11 15:43:30");
System.out.println("time:"+time);
}
/**
* 格式化时间
* @param time
*@return
*/
private static String formatDateTime(String time) {
SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
if(time==null ||"".equals(time)){
return"";
}
Date date = null;
try {
date = format.parse(time);
} catch (ParseException e) {
e.printStackTrace();
}
Calendar current = Calendar.getInstance();
Calendar today = Calendar.getInstance(); //今天
today.set(Calendar.YEAR, current.get(Calendar.YEAR));
today.set(Calendar.MONTH, current.get(Calendar.MONTH));
today.set(Calendar.DAY_OF_MONTH,current.get(Calendar.DAY_OF_MONTH));
// Calendar.HOUR——12小时制的小时数 Calendar.HOUR_OF_DAY——24小时制的小时数
today.set( Calendar.HOUR_OF_DAY, 23);
today.set( Calendar.MINUTE, 59);
today.set(Calendar.SECOND, 59);
Calendar yesterday = Calendar.getInstance(); //昨天
yesterday.set(Calendar.YEAR, current.get(Calendar.YEAR));
yesterday.set(Calendar.MONTH, current.get(Calendar.MONTH));
yesterday.set(Calendar.DAY_OF_MONTH,current.get(Calendar.DAY_OF_MONTH)-1);
yesterday.set( Calendar.HOUR_OF_DAY, 23);
yesterday.set( Calendar.MINUTE, 59);
yesterday.set(Calendar.SECOND, 59);
current.setTime(date);
if(current.after(today)){
return "明天 "+time.split(" ")[1];
}else if(current.before(today) && current.after(yesterday)){
return "今天 "+time.split(" ")[1];
}else{
int index = time.indexOf("-")+1;
return "昨天 "+time.substring(index, time.length());
}
}
}