java 数据压缩

标签：des   http   java   数据   io   代码   

1.public static void main(String[] args) throws Exception {
String cont = "";
String cont2=jm(yjy(cont));
if(cont.equals(cont2)){
System.out.println("比对成功");
}else{
System.out.println("比对失败");
public static String yjy(String cont) throws Exception {
System.out.println("明文长度:" + cont.length());
// 第一次压缩
cont = ZipUtil2.compress(cont);
System.out.println("压缩后：" + cont.length());
// 第一次加密
cont = DesUtil.encrypt(cont, DesUtil.PWD_KEY);
System.out.println("加密长度：" + cont.length());
// 第二次压缩
cont = ZipUtil2.compress(cont);
System.out.println("再压缩:" + cont.length());
return cont;
public static String jm(String cont) throws Exception {
System.out.println("-----------------------------");
System.out.println("密文长度:" + cont.length());
// 第一次解压缩
cont = ZipUtil2.uncompress(cont);
System.out.println("解压缩：" + cont.length());
// 第一次解密
cont = DesUtil.decrypt(cont, DesUtil.PWD_KEY);
System.out.println("解密后：" + cont.length());
// 第二次解压缩
cont = ZipUtil2.uncompress(cont);
System.out.println("再解压：" + cont.length());
return cont;
2.import java.io.IOException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import Decoder.BASE64Decoder;
import Decoder.BASE64Encoder;
public class DesUtil {
private final static String DES = "DES";
public final static String PWD_KEY = "MZTHPWDJM";
public final static String ID_KEY = "MZTHIDJM";
public static void main(String[] args) throws Exception {
String data = "xkajsdasdk‘al;ks‘dl;kasl;d";
System.err.println("加密："+encrypt(data, PWD_KEY));
System.err.println("解密：" +decrypt(encrypt(data, PWD_KEY), PWD_KEY));**
* Description 根据键值进行加密
* @param data
* @param key
* 加密键byte数组
* @return
* @throws Exception
public static String encrypt(String data, String key) throws Exception {
byte[] bt = encrypt(data.getBytes(), key.getBytes());
String strs = new BASE64Encoder().encode(bt);
return strs;
* Description 根据键值进行解密
* @param data
* @param key
* 加密键byte数组
* @return
* @throws IOException
* @throws Exception
*/
public static String decrypt(String data, String key) throws IOException,
Exception {
if (data == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
byte[] buf = decoder.decodeBuffer(data);
byte[] bt = decrypt(buf, key.getBytes());
return new String(bt);
* Description 根据键值进行加密
* @param data
* @param key
* 加密键byte数组
* @return
* @throws Exception/
private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
* Description 根据键值进行解密
* @param data
* @param key
* 加密键byte数组
* @return http://www.huiyi8.com/jiaoben/
* @throws Exception网页特效代码
private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
return cipher.doFinal(data);

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java 数据压缩

标签：des   http   java   数据   io   代码   

原文地址：http://www.cnblogs.com/cjings/p/3850564.html