JAVA实现3DES加密解密

代码如下：

package com.runant.util.encrpt.key;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
/**
* 3DES加密解密工具
* @author ping
*
*/
public class DesEncrypt {
private Key key;
private static final String KEY_ALGORITHM = "DESede";
private static final String CIPHER_ALGORITHM = "DESede/ECB/PKCS5Padding";

/**
* 默认构造函数
*/
public DesEncrypt() {

}
/**
* 构造函数,初始化Key
* @param keyStore
*/
public DesEncrypt(String keyStore) {
this.toKey(keyStore);
}

/**
* 初始化Key对象
* @param keyText
* @return
*/
public void toKey(String keyText) {
DESedeKeySpec dks;
SecretKeyFactory factory =null;
if(check(keyText)){
try {
dks = new DESedeKeySpec(keyText.getBytes());
factory= SecretKeyFactory.getInstance(KEY_ALGORITHM);
this.key = factory.generateSecret(dks);
} catch (Exception e) {
e.printStackTrace();
}
}
}

/**
*
* @param 密钥keyText
* @return 校验密钥格式是否通过
*/
public boolean check(String keyText){
boolean flag = false ;
if(keyText!=null&&!"".equals(keyText.trim())){
if(keyText.trim().length()>=24){
flag = true ;
}
}
return flag ;
}

/**
* 加密
* @param 明文 inputText
* @return 密文 outputText
*/
public String getEncString(String inputText) {
Cipher cipher = null;
String outputText = null ;
try {
cipher =Cipher.getInstance(CIPHER_ALGORITHM) ;
cipher.init(Cipher.ENCRYPT_MODE, this.key) ;
outputText= Base64.encode(cipher.doFinal(inputText.getBytes("UTF8")));
} catch (Exception e) {
e.printStackTrace();
}finally{
cipher= null;
}
return outputText;
}

/**
* 解密
* @param 密文 inputText
* @return 明文 outputText
*/
public String getDesString(String inputText) {
Cipher cipher = null;
String outputText = null ;
try {
cipher =Cipher.getInstance(CIPHER_ALGORITHM) ;
cipher.init(Cipher.DECRYPT_MODE, this.key) ;
outputText= new String(cipher.doFinal(Base64.decode(inputText)));
} catch (Exception e) {
e.printStackTrace();
}finally{
cipher= null;
}
return outputText;
}

}