面试题: 怎么把系统时间写入文件中? 面试遇到这样一个问题1. 怎么把系统当前时间写入文件中?按这个格式 yyyy-MM-dd HH:mm:ss2. 怎么读这个文件把它解析成一个DATE类型 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 晕,居然有公司出这么简单面试题?这些都是用的很烂的代码了,就是日期和String互换Date d=new Date();SimpleDateFormat sf=new SimpleDateFormat("yy-mm-dd hh:mm:ss");String s=sf.parse(d); import java.io.*;import java.util.*;import java.text.*;public class DateInFile{ public static void main(String[] args){ File file = new File("D:/train/csdn/date.txt"); try{ BufferedWriter bw = new BufferedWriter(new FileWriter("D:\\train\\csdn\\date.txt")); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date d = new Date(); String msg = sdf.format(d); bw.write(msg); bw.flush();System.out.println(msg+"已写入文件!"); bw.close(); BufferedReader buf = new BufferedReader(new FileReader("D:\\train\\csdn\\date.txt")); String s = buf.readLine(); Date dd = sdf.parse(s);System.out.println(dd+"已从文件取出!"); buf.close(); } catch(Exception e){ e.printStackTrace(); } }} 2楼 答案不错 就是IO的操作 以及 date的 format 1楼的好像不对吧,parse方法怎么返回是String类型呢 C#代码,using System;using System.Collections.Generic;using System.Text;using System.IO;using System.Windows.Forms;using System.Runtime.InteropServices;namespace ConvertUnicodeToByte{ class IniFile { static void Main(string[] args) { string riqi = ""; string path = ""; riqi = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss "); //path = Application.StartupPath + "timedate.ini"; path = @"C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\Projects\ConvertUnicodeToByte\ConvertUnicodeToByte\bin\Debug\timedate.ini"; WriteIniData("Now", "datetime", riqi, path); Console.WriteLine(); Console.WriteLine(ReadIniData("Now", "datetime", "", path)); Console.ReadLine(); } [DllImport("kernel32")]//返回0表示失败,非0为成功 private static extern long WritePrivateProfileString(string section, string key, string val, string filePath); [DllImport("kernel32")]//返回取得字符串缓冲区的长度 private static extern long GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath); // 写入*.ini文件 public static bool WriteIniData(string Section, string Key, string Value, string iniFilePath) { if (File.Exists(iniFilePath)) { long OpStation = WritePrivateProfileString(Section, Key, Value, iniFilePath); if (OpStation == 0) { return false; } else { return true; } } else { return false; } } // 读取*.ini文件中的相应节下面的键值 public static string ReadIniData(string Section, string Key, string NoText, string iniFilePath) { if (File.Exists(iniFilePath)) { StringBuilder temp = new StringBuilder(1024); GetPrivateProfileString(Section, Key, NoText, temp, 1024, iniFilePath); return temp.ToString(); } else { return String.Empty; } } }} mysql 权限问题 MVC结构中DAO是属于model还是controller 获取get方式提交的汉字为什么遇到奇数位的汉字最后一个位汉字就显示不出来 菜鸟的.IOException问题 给一个JPanel添加一个键盘事件!怎么添加(在线等) 请问这个class如何修改为servlet? 求救,怎么实现iterator的双重循环 请问java中的构造器如何理解? java thread正常中止的问题:run()中的代码一直在执行,如果中止? 输入一个字符串 关于SWING窗体的一些问题 if语句实现问题
Date d=new Date();
SimpleDateFormat sf=new SimpleDateFormat("yy-mm-dd hh:mm:ss");
String s=sf.parse(d);
import java.util.*;
import java.text.*;
public class DateInFile{
public static void main(String[] args){
File file = new File("D:/train/csdn/date.txt");
try{
BufferedWriter bw = new BufferedWriter(new FileWriter("D:\\train\\csdn\\date.txt"));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d = new Date();
String msg = sdf.format(d);
bw.write(msg);
bw.flush();
System.out.println(msg+"已写入文件!");
bw.close();
BufferedReader buf = new BufferedReader(new FileReader("D:\\train\\csdn\\date.txt"));
String s = buf.readLine();
Date dd = sdf.parse(s);
System.out.println(dd+"已从文件取出!");
buf.close();
}
catch(Exception e){
e.printStackTrace();
}
}
}
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Runtime.InteropServices;namespace ConvertUnicodeToByte
{
class IniFile
{
static void Main(string[] args)
{
string riqi = "";
string path = "";
riqi = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss ");
//path = Application.StartupPath + "timedate.ini";
path = @"C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\Projects\ConvertUnicodeToByte\ConvertUnicodeToByte\bin\Debug\timedate.ini";
WriteIniData("Now", "datetime", riqi, path);
Console.WriteLine();
Console.WriteLine(ReadIniData("Now", "datetime", "", path));
Console.ReadLine();
} [DllImport("kernel32")]//返回0表示失败,非0为成功
private static extern long WritePrivateProfileString(string section, string key,
string val, string filePath); [DllImport("kernel32")]//返回取得字符串缓冲区的长度
private static extern long GetPrivateProfileString(string section, string key,
string def, StringBuilder retVal, int size, string filePath); // 写入*.ini文件
public static bool WriteIniData(string Section, string Key, string Value, string iniFilePath)
{
if (File.Exists(iniFilePath))
{
long OpStation = WritePrivateProfileString(Section, Key, Value, iniFilePath);
if (OpStation == 0)
{
return false;
}
else
{
return true;
}
}
else
{
return false;
}
} // 读取*.ini文件中的相应节下面的键值
public static string ReadIniData(string Section, string Key, string NoText, string iniFilePath)
{
if (File.Exists(iniFilePath))
{
StringBuilder temp = new StringBuilder(1024);
GetPrivateProfileString(Section, Key, NoText, temp, 1024, iniFilePath);
return temp.ToString();
}
else
{
return String.Empty;
}
} }
}