java 时间与字符串之间的转换

1. long字符串转换成yyyy-MM-dd HH:mm:ss格式输出

import java.text.SimpleDateFormat;
import java.util.Date;
//将long字符串转换成格式时间输出
public class LongToString {
public static void main(String argsp[]){
String time="1256006105375";

Date date=new Date(Long.parseLong(time));
SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
time=formatter.format(date);
System.out.println(time);
}
}

2. 字符串转换成时间
import java.text.SimpleDateFormat;
import java.util.Date;

import ognl.ParseException;

public class StringToDate {
public static void main(String argsp[]) throws Exception{
String time="2010-11-20 11:10:10";

Date date=null;
SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
date=formatter.parse(time);
System.out.println(date);
}
}

3. 取得当前系统时间，返回yyyy-MM-dd HH:mm:ss字符串
import java.text.SimpleDateFormat;
import java.util.Date;

public class StringToDate {
public static void main(String argsp[]) throws Exception{

Date date=new Date();
SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time=formatter.format(date);
System.out.println(time);
}
}

4. 取得当前系统时间，返回 HH:mm:ss字符串
import java.text.SimpleDateFormat;
import java.util.Date;

public class StringToDate {
public static void main(String argsp[]) throws Exception{

Date date=new Date();
SimpleDateFormat formatter=new SimpleDateFormat("HH:mm:ss");
String time=formatter.format(date);
System.out.println(time);
}
}


5.将20101125102503转换成2010-11-25 10:25:03输出
import java.text.SimpleDateFormat;
import java.util.Date;

public class StringToDate {
public static void main(String argsp[]) throws Exception{

String time="20101125102503";
SimpleDateFormat formatter1=new SimpleDateFormat("yyyy-HH-dd HH:mm:ss");
SimpleDateFormat formatter2=new SimpleDateFormat("yyyyHHddHHmmss");
time=formatter1.format(formatter2.parse(time));
System.out.println(time);
}
}