适用于java me的加密解密

import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.Key;import java.security.NoSuchAlgorithmException;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.NoSuchPaddingException;import javax.crypto.ShortBufferException;import javax.crypto.spec.SecretKeySpec;public class CipherCode {private static CipherCode cipherCode;private Cipher cipher;private Key key;private boolean isEncrpts;private CipherCode() {isEncrpts = true;try {cipher = Cipher.getInstance("DES");} catch (NoSuchAlgorithmException e) {cipherCode = null;e.printStackTrace();} catch (NoSuchPaddingException e) {cipherCode = null;e.printStackTrace();}}public static CipherCode getInstance() {if (cipherCode == null) {cipherCode = new CipherCode();}return cipherCode;}public void setKey(String keyString) {byte[] keyData = keyString.getBytes();key = new SecretKeySpec(keyData, 0, keyData.length, "DES");}public String doFinal(String sourceString) throws InvalidKeyException,IllegalStateException, IllegalBlockSizeException,BadPaddingException, UnsupportedEncodingException {String cryptedString = null;if (isEncrpts)cipher.init(Cipher.ENCRYPT_MODE, key);elsecipher.init(Cipher.DECRYPT_MODE, key);int cypheredBytes = 0;byte[] inputBytes = sourceString.getBytes("iso-8859-1");byte[] outputBytes = new byte[256];while (true) {try {cypheredBytes = cipher.doFinal(inputBytes, 0,inputBytes.length, outputBytes, 0);break;} catch (ShortBufferException e) {outputBytes = new byte[outputBytes.length * 2];}}cryptedString = new String(outputBytes, 0, cypheredBytes, "iso-8859-1");return cryptedString;}public void isEncrpts(boolean isEncrpts) {this.isEncrpts = isEncrpts;}}

 

使用的时候只要调用就行了，isEncrpts（true）为加密，isEncrpts（false）为解密。

还有一点非常重要，这个输出的字符串是iso8859-1编码，无法输出汉字，要再加转换。所以加密也不能是汉字。