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Java控制台输入，输出

黑马_2046 — Thu, 29 Mar 2007 10:36:00 GMT

import (t��ng)java.io.BufferedReader; (t��ng)
import (t��ng)java.io.IOException; (t��ng)
import (t��ng)java.io.InputStreamReader; (t��ng)

public (t��ng)class (t��ng)EnterConsole (t��ng)
{ (t��ng)
public (t��ng)static (t��ng)void (t��ng)main(String[] (t��ng)args) (t��ng)throws (t��ng)I(y��ng)OException (t��ng)
{ (t��ng)
EnterConsole (t��ng)enterConsole (t��ng)= (t��ng)new (t��ng)EnterConsole(); (t��ng)
enterConsole.printConsoleChar(); (t��ng)
} (t��ng)
/** (t��ng)
* (t��ng)从控制对接收一行字�W�串�Q�然后输出到控制�?qi��ng)W?
* (t��ng)@throws (t��ng)I(y��ng)OException (t��ng)
*/ (t��ng)
public (t��ng)void (t��ng)printConsoleLine() (t��ng)throws (t��ng)I(y��ng)OException (t��ng)
{ (t��ng)
BufferedReader (t��ng)br (t��ng)= (t��ng)new (t��ng)BufferedReader(new (t��ng)I(y��ng)nputStreamReader(System.in)); (t��ng)
String (t��ng)str (t��ng)= (t��ng)null; (t��ng)
System.out.println("Enter (t��ng)your (t��ng)value:"); (t��ng)
str (t��ng)= (t��ng)br.readLine(); (t��ng)
System.out.println("your (t��ng)value (t��ng)is (t��ng):"+str); (t��ng)
} (t��ng)
/** (t��ng)
* (t��ng)从控制台接收一个字�W��?
* (t��ng)然后打印到控制台上�?
* (t��ng)@throws (t��ng)I(y��ng)OException (t��ng)
*/ (t��ng)
public (t��ng)void (t��ng)printConsoleChar() (t��ng)throws (t��ng)I(y��ng)OException (t��ng)
{ (t��ng)
System.out.print("Enter (t��ng)a (t��ng)Char:"); (t��ng)
char (t��ng)i (t��ng)= (t��ng)(char) (t��ng)System.in.read(); (t��ng)
System.out.println("your (t��ng)char (t��ng)is (t��ng):"+i); (t��ng)
} (t��ng)
}

黑马_2046 2007-03-29 18:36 发表评论

黑马_2046 — Wed, 28 Mar 2007 05:17:00 GMT

2�Q? DES��法��?br />DES卛_��l�加密算法，明文密文都��?4位数据分�l�；采用对称��法�Q�加密和解密��法相同�Q�但是��用的密钥不同�Q�密钥��?6位数�Q�由于算法只使用�?ji��n)简单的数据逻辑和算术运��，所以实现�v来相对简单。本文就使用DES��法来给��Z��个加解密工具�c�R�?br />3.java 实现的对字符串加解密工具�c?br />
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
import java.security.spec.*;
import com.sun.crypto.provider.SunJCE;
import java.io.Serializable;

/**
* 提供加密��法�Q�可以对输入的字�W�串�q�行加密、解密操�?br />*/
public class EncryptData
{
byte[] encryptKey;
DESedeKeySpec spec;
SecretKeyFactory keyFactory;
SecretKey theKey;
Cipher cipher;
IvParameterSpec IvParameters;

public EncryptData()
{
try
{
// ��(g��)��是否有 TripleDES 加密的供应程�?br /> // 如无�Q�明��地安装SunJCE 供应�E�序
try{ Cipher c = Cipher.getInstance("DESede"); }
catch (Exception e)
{
System.err.println("Installling SunJCE provider.");
Provider sunjce = new com.sun.crypto.provider.SunJCE();
Security.addProvider(sunjce);
}
// 创徏一个密�?br /> encryptKey = "This is a test DESede Key".getBytes();

// ��Z��一密钥创徏一个指定的 DESSede key
spec = new DESedeKeySpec(encryptKey);

// 得到 DESSede keys
keyFactory = SecretKeyFactory.getInstance("DESede");

// 生成一�?DESede 密钥对象
theKey = keyFactory.generateSecret(spec);

// 创徏一�?DESede 密码
cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");

// �?CBC 模式创徏一个用于初始化�?vector 对象
IvParameters =
new IvParameterSpec(new byte[]{12,34,56,78,90,87,65,43} );
}
catch (Exception exc)
{
// 记录加密或解密操作错�?br /> }
}

/**
* 加密��法
* @param password �{�待加密的密�?br /> * @return 加密以后的密�?br /> * @throws Exception
*/
public byte[] encrypt(String password)
{
String encrypted_password = null;
byte[] encrypted_pwd = null;

try
{
// 以加密模式初始化密钥
cipher.init(Cipher.ENCRYPT_MODE,theKey,IvParameters);

// 加密前的密码�Q�旧�Q?br /> byte[] plainttext = password.getBytes();

// 加密密码
encrypted_pwd = cipher.doFinal(plainttext);

// 转成字符�Ԍ��得到加密后的密码�Q�新�Q?br /> encrypted_password = new String(encrypted_pwd);
}
catch(Exception ex)
{
// 记录加密错误
}
return encrypted_pwd;
}

/**
* 解密��法
* @param password 加过密的密码
* @return 解密后的密码
*/
public String decrypt(byte[] password)
{
String decrypted_password = null;
try
{
// 以解密模式初始化密钥
cipher.init(Cipher.DECRYPT_MODE,theKey,IvParameters);

// 构造解密前的密�?br /> byte[] decryptedPassword = password;

// 解密密码
byte[] decrypted_pwd = cipher.doFinal(decryptedPassword);
// 得到�l�果
decrypted_password = new String(decrypted_pwd);
}
catch(Exception ex)
{
// 记录解密错误
}
return decrypted_password;
}
}

黑马_2046 2007-03-28 13:17 发表评论

黑马_2046 — Fri, 23 Mar 2007 09:21:00 GMT

摘要: < html > < header > <% @ (t��ng)Language = JScript (t��ng) %> ... 阅读全文

黑马_2046 2007-03-23 17:21 发表评论

用JSSE定制SSL�q�接(�?

黑马_2046 — Thu, 15 Mar 2007 14:31:00 GMT

摘要: ssl 阅读全文

黑马_2046 2007-03-15 22:31 发表评论

使用SSL构徏安全的Socket(�?

黑马_2046 — Thu, 15 Mar 2007 13:15:00 GMT

摘要: ssl 阅读全文

黑马_2046 2007-03-15 21:15 发表评论