takeco @Wiki
http://w.atwiki.jp/takeco/
takeco @Wiki
ja
2005-08-19T22:06:39+09:00
1124456799
-
暗号化
https://w.atwiki.jp/takeco/pages/6.html
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.CipherOutputStream;
import javax.crypto.CipherInputStream;
public class Angou{
public static void main(String args[]){
try{
KeyGenerator kg = KeyGenerator.getInstance("DES");
SecretKey key = kg.generateKey();
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
File file = new File("Angou.txt");
cipher.init(Cipher.ENCRYPT_MODE,key);
BufferedWriter bw = new BufferedWriter(
new OutputStreamWriter(
new CipherOutputStream(
new FileOutputStream(file),cipher)));
bw.write("暗号化します");
bw.newLine();
bw.write("これが暗号化だ！！");
bw.close();
cipher.init(Cipher.DECRYPT_MODE,key);
BufferedReader br = new BufferedReader(
new InputStreamReader(
new CipherInputStream(
new FileInputStream(file),cipher)));
//一旦一行読込まないとbr.ready()が機能しない
System.out.println(br.readLine());
while(br.ready()){
System.out.println(br.readLine());
}
br.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
2005-08-19T22:06:39+09:00
1124456799
-
java.text.DateFormat
https://w.atwiki.jp/takeco/pages/5.html
import java.util.Date;
import java.text.DateFormat;
public class DF{
public static void main(String args[]){
String t,d,td;
Date date = new Date();
System.out.println(date);
t = DateFormat.getTimeInstance().format(date);
System.out.println(t);
d = DateFormat.getDateInstance().format(date);
System.out.println(d);
td = DateFormat.getDateTimeInstance().format(date);
System.out.println(td);
//---------------------
// case:getTimeInstance
//---------------------
System.out.println("case:getTimeInstance");
try{
date = DateFormat.getTimeInstance().parse(t);
System.out.println("T t:" + date);
}catch(Exception e){}
try{
date = DateFormat.getTimeInstance().parse(d);
System.out.println("T d:" + date);
}catch(Exception e){}
try{
date = DateFormat.getTimeInstance().parse(td);
System.out.println("T td:" + date);
}catch(Exception e){}
try{
date = DateFormat.getTimeInstance().parse(date.toString());
System.out.println("T :" + date);
}catch(Exception e){}
//---------------------
// case:getDateInstance
//---------------------
System.out.println("case:getDateInstance");
try{
date = DateFormat.getDateInstance().parse(t);
System.out.println("D t:" + date);
}catch(Exception e){}
try{
date = DateFormat.getDateInstance().parse(d);
System.out.println("D d:" + date);
}catch(Exception e){}
try{
date = DateFormat.getDateInstance().parse(td);
System.out.println("D td:" + date);
}catch(Exception e){}
try{
date = DateFormat.getDateInstance().parse(date.toString());
System.out.println("D :" + date);
}catch(Exception e){}
//---------------------
// case:getDateTimeInstance
//---------------------
System.out.println("case:getDateTimeInstance");
try{
date = DateFormat.getDateTimeInstance().parse(t);
System.out.println("DT t:" + date);
}catch(Exception e){} try{
date = DateFormat.getDateTimeInstance().parse(d);
System.out.println("DT d:" + date);
}catch(Exception e){} try{
date = DateFormat.getDateTimeInstance().parse(td);
System.out.println("DT td:" + date);
}catch(Exception e){} try{
date = DateFormat.getDateTimeInstance().parse(date.toString());
System.out.println("DT :" + date);
}catch(Exception e){}
}
}
2005-07-20T23:03:20+09:00
1121868200