时间格式化方式，由Date对象生成Calander对象
package com.single;import java.io.File;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Calendar;public class TestIo{ public static final String SDF_STYLE_SPECIAL_CHAR = "yyyy-MM-dd HH:mm:ss"; public static final String SDF_STYLE_NO_SPACING = "yyyyMMddHHmmss"; public static final String SDF_SHORT_STYLE_SPECIAL_CHAR = "HH:mm:ss"; public static final String SDF_SHORT_STYLE_NO_SPACING = "HHmmss"; public static void main(String[] args) throws IOException { File f = new File("f:/abc/abc.txt"); f.createNewFile(); //利用时间构造calander就应该这样，f.lastModified()获取的是一个long类型 (new Date()).getTime()也是一个long类型 Calendar c = Calendar.getInstance(); c.setTimeInMillis(f.lastModified()); SimpleDateFormat fmt1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); // SimpleDateFormat dateFormate = new SimpleDateFormat("yyyyMMddHHmmss"); // 日期格式 SimpleDateFormat dateFormate = new SimpleDateFormat("yyyy-MM-dd"); // 日期时间格式 SimpleDateFormat dateTimeFormate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); /*有冒号时间格式*/ SimpleDateFormat xx = new SimpleDateFormat("HH:mm:ss"); /*无冒号时间格式*/ SimpleDateFormat ccc = new SimpleDateFormat("HHmmss"); System.out.println(fmt1.format(c.getTime())); }}?