在JSP中实现DES加密解密的例子

DES.java

package Lion.Security.Cryptography;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
/**
* DES加密的，文件中共有两个方法,加密、解密
* @author Lion
* @author www.lionsky.net
*/
public class DES {
    private String Algorithm = "DES";
    private KeyGenerator keygen;
    private SecretKey deskey;
    private Cipher c;
    private byte[] cipherByte;

    /**
     * 初始化 DES 实例
     */
    public DES() {
          init();
    }

    public void init() {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        try {
               keygen = KeyGenerator.getInstance(Algorithm);
               deskey = keygen.generateKey();
               c = Cipher.getInstance(Algorithm);
         }
         catch(NoSuchAlgorithmException ex){
            ex.printStackTrace();
        }
         catch(NoSuchPaddingException ex){
            ex.printStackTrace();
        }
       }

    /**
     * 对 String 进行加密
     * @param str 要加密的数据
     * @return 返回加密后的 byte 数组
     */
     public byte[] createEncryptor(String str) {
        try {
             c.init(Cipher.ENCRYPT_MODE, deskey);
             cipherByte = c.doFinal(str.getBytes());
        }
        catch(java.security.InvalidKeyException ex){
            ex.printStackTrace();
        }
        catch(javax.crypto.BadPaddingException ex){
            ex.printStackTrace();
        }
        catch(javax.crypto.IllegalBlockSizeException ex){
            ex.printStackTrace();
        }
        return cipherByte;
     }

    /**
     * 对 Byte 数组进行解密
     * @param buff 要解密的数据
     * @return 返回加密后的 String
     */
     public String createDecryptor(byte[] buff) {
        try {
           c.init(Cipher.DECRYPT_MODE, deskey);
           cipherByte = c.doFinal(buff);
        }
        catch(java.security.InvalidKeyException ex){
            ex.printStackTrace();
        }
        catch(javax.crypto.BadPaddingException ex){
            ex.printStackTrace();
        }
        catch(javax.crypto.IllegalBlockSizeException ex){
            ex.printStackTrace();
        }
        return (new String(cipherByte));
     }
}

DES.jsp

<%@ page contentType="text/html; charset=gb2312" %>
<jsp:useBean id="DES" scope="page" class="Lion.Security.Cryptography.DES" />
<html>
<head><title>DES File</title></head>

<body bgcolor="#FFFFFF">
<div align="center"><center>
<%
String Test = request.getParameter("Test");
if(Test==null || Test.equals("")) {
%>
    <form name="form" method="post">
    <input type="text" name="Test" size="25" value=""/>
    <input type="submit" name="button" value=" 确定 "/>
    </form>
    <%
}else{
            out.println("加密前的数据："+Test +"<br/>");
            out.println("加密后的数据："+DES.createEncryptor(Test) +"<br/>");
            out.println("解密后的数据："+DES.createDecryptor(DES.createEncryptor(Test)) +"<br/>");
      }
    %>
</center></div>
</body>
</html>

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