求救，如何将一个字符串加密？ Java / J2SE / 基础类

可以采用对称算法或者是非对称算法来解决你的问题，我这里有一个项目中使用的对称加密解密算法，你可以直接拿来使用：
/**
*   CryptionData.java
*   @version   1.0
*   @author   2005/4/20   Yao   (WICT)
*/
package   DES;
import   javax.crypto.Cipher;
import   javax.crypto.SecretKey;
import   javax.crypto.SecretKeyFactory;
import   javax.crypto.spec.*;
import   sun.misc.*;
/**
*   DES   encryption   algorithm,   providing   the   encryption   and   decryption
*   algorithm   for   byte   array   and   string
*   @author   :   Yao   (WICT)
*   @version   1.0
*/
public   class   CryptionData   {
//   The   length   of   Encryptionstring   should   be   8   bytes   and   not   be
//   a   weak   key
private   String   EncryptionString;
//   The   initialization   vector   should   be   8   bytes
private   final   byte[]   EncryptionIV   =   "abcdefgh".getBytes();
private   final   static   String   DES   =   "DES/CBC/PKCS5Padding";
/**
*   Saving   key   for   encryption   and   decryption
*   @param   EncryptionString   String
*/
public   CryptionData(String   EncryptionString)   {
this.EncryptionString   =   EncryptionString;
}
/**
*   Encrypt   a   byte   array
*   @param   SourceData   byte[]
*   @throws   Exception
*   @return   byte[]
*/
public   byte[]   EncryptionByteData(byte[]   SourceData)   throws   Exception   {
byte[]   retByte   =   null;
//   Create   SecretKey   object
byte[]   EncryptionByte   =   EncryptionString.getBytes();
DESKeySpec   dks   =   new   DESKeySpec(EncryptionByte);
SecretKeyFactory   keyFactory   =   SecretKeyFactory.getInstance("DES");
SecretKey   securekey   =   keyFactory.generateSecret(dks);
//   Create   IvParameterSpec   object   with   initialization   vector
IvParameterSpec   spec=new   IvParameterSpec(EncryptionIV);
//   Create   Cipter   object
Cipher   cipher   =   Cipher.getInstance(DES);
//   Initialize   Cipher   object
cipher.init(Cipher.ENCRYPT_MODE,   securekey,   spec);
//   Encrypting   data
retByte   =   cipher.doFinal(SourceData);
return   retByte;
}
/**
*   Decrypt   a   byte   array
*   @param   SourceData   byte[]
*   @throws   Exception
*   @return   byte[]
*/
public   byte[]   DecryptionByteData(byte[]   SourceData)   throws   Exception   {
byte[]   retByte   =   null;
//   Create   SecretKey   object
byte[]   EncryptionByte   =   EncryptionString.getBytes();
DESKeySpec   dks   =   new   DESKeySpec(EncryptionByte);
SecretKeyFactory   keyFactory   =   SecretKeyFactory.getInstance("DES");
SecretKey   securekey   =   keyFactory.generateSecret(dks);
//   Create   IvParameterSpec   object   with   initialization   vector
IvParameterSpec   spec=new   IvParameterSpec(EncryptionIV);
//   Create   Cipter   object
Cipher   cipher   =   Cipher.getInstance(DES);
//   Initialize   Cipher   object
cipher.init(Cipher.DECRYPT_MODE,   securekey,   spec);
//   Decrypting   data
retByte   =   cipher.doFinal(SourceData);
return   retByte;
}
/**
*   Encrypt   a   string
*   @param   SourceData   String
*   @throws   Exception
*   @return   String
*/
public   String   EncryptionStringData(String   SourceData)   throws   Exception   {
String   retStr   =   null;
byte[]   retByte   =   null;
//   Transform   SourceData   to   byte   array
byte[]   sorData   =   SourceData.getBytes();
//   Encrypte   data
retByte   =   EncryptionByteData(sorData);
//   Encode   encryption   data
BASE64Encoder   be   =   new   BASE64Encoder();
retStr   =   be.encode(retByte);
return   retStr;
}
/**
*   Decrypt   a   string
*   @param   SourceData   String
*   @throws   Exception
*   @return   String
*/
public   String   DecryptionStringData(String   SourceData)   throws   Exception   {
String   retStr   =   null;
byte[]   retByte   =   null;
//   Decode   encryption   data
BASE64Decoder   bd   =   new   BASE64Decoder();
byte[]   sorData   =   bd.decodeBuffer(SourceData);
//   Decrypting   data
retByte   =   DecryptionByteData(sorData);
retStr   =   new   String(retByte);
return   retStr;
}
}
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