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在前面介绍了一些加密解密类的使用，这里综合起来做一个简单的测试，代码如下：

MainActivity：

package com.home.testdes;import android.os.Bundle;import android.util.Log;import android.app.Activity;public class MainActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		DESUtil u = new DESUtil();		String mi = u.getEnc("I love you");		Log.i("加密后", mi);		String ming = u.getDec(mi);		Log.i("解密后", ming);	}}

加密解密工具类：

package com.home.testdes;import java.security.Key;import java.security.spec.AlgorithmParameterSpec;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;import android.util.Base64;/** * 使用DES加密和解密工具类 *  * @author Administrator *  */public class DESUtil {	private Key key;// 密钥的key值	private byte[] DESkey;	private byte[] DESIV = { 0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xAB,			(byte) 0xCD, (byte) 0xEF };	private AlgorithmParameterSpec iv = null;// 加密算法的参数接口	public DESUtil() {		try {			this.DESkey = "abcdefghijk".getBytes("UTF-8");// 设置密钥			DESKeySpec keySpec = new DESKeySpec(DESkey);// 设置密钥参数			iv = new IvParameterSpec(DESIV);// 设置向量			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂			key = keyFactory.generateSecret(keySpec);// 得到密钥对象		} catch (Exception e) {			e.printStackTrace();		}	}	/**	 * 加密String 明文输入密文输出	 * 	 * @param inputString	 *            待加密的明文	 * @return 加密后的字符串	 */	public String getEnc(String inputString) {		byte[] byteMi = null;		byte[] byteMing = null;		String outputString = "";		try {			byteMing = inputString.getBytes("UTF-8");			byteMi = this.getEncCode(byteMing);			byte[] temp = Base64.encode(byteMi, Base64.DEFAULT);			outputString = new String(temp);		} catch (Exception e) {		} finally {			byteMing = null;			byteMi = null;		}		return outputString;	}	/**	 * 解密String 以密文输入明文输出	 * 	 * @param inputString	 *            需要解密的字符串	 * @return 解密后的字符串	 */	public String getDec(String inputString) {		byte[] byteMing = null;		byte[] byteMi = null;		String strMing = "";		try {			byteMi = Base64.decode(inputString.getBytes(), Base64.DEFAULT);			byteMing = this.getDesCode(byteMi);			strMing = new String(byteMing, "UTF8");		} catch (Exception e) {		} finally {			byteMing = null;			byteMi = null;		}		return strMing;	}	/**	 * 加密以byte[]明文输入,byte[]密文输出	 * 	 * @param bt	 *            待加密的字节码	 * @return 加密后的字节码	 */	private byte[] getEncCode(byte[] bt) {		byte[] byteFina = null;		Cipher cipher;		try {			// 得到Cipher实例			cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");			cipher.init(Cipher.ENCRYPT_MODE, key, iv);			byteFina = cipher.doFinal(bt);		} catch (Exception e) {			e.printStackTrace();		} finally {			cipher = null;		}		return byteFina;	}	/**	 * 解密以byte[]密文输入,以byte[]明文输出	 * 	 * @param bt	 *            待解密的字节码	 * @return 解密后的字节码	 */	private byte[] getDesCode(byte[] bt) {		Cipher cipher;		byte[] byteFina = null;		try {			// 得到Cipher实例			cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");			cipher.init(Cipher.DECRYPT_MODE, key, iv);			byteFina = cipher.doFinal(bt);		} catch (Exception e) {			e.printStackTrace();		} finally {			cipher = null;		}		return byteFina;	}}

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