java加、解密

import java.security.*;
import javax.crypto.*;
import sun.misc.*;

/**
* 使用DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储. 方法: void
* getKey(String strKey)从strKey的字条生成一个Key String getEncString(String
* strMing)对strMing进行加密,返回String密文 String getDesString(String
* strMi)对strMin进行解密,返回String明文 byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[]
* getDesCode(byte[] byteD)byte[]型的解密
*/
public class Encrypt {
private Key key;
private byte[] byteMi = null;
private byte[] byteMing = null;
private String strMi = "";
private String strM = "";

// 根据参数生成KEY
public void setKey(String strKey) {
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
_generator.init(new SecureRandom(strKey.getBytes()));
this.key = _generator.generateKey();
_generator = null;
} catch (Exception e) {
e.printStackTrace();
}
}

// 加密String明文输入,String密文输出
public void setEncString(String strMing) {
BASE64Encoder base64en = new BASE64Encoder();
try {
this.byteMing = strMing.getBytes("UTF8");
this.byteMi = this.getEncCode(this.byteMing);
this.strMi = base64en.encode(this.byteMi);
} catch (Exception e) {
e.printStackTrace();
} finally {
this.byteMing = null;
this.byteMi = null;
}
}

// 加密以byte[]明文输入,byte[]密文输出
private byte[] getEncCode(byte[] byteS) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byteS);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}

// 解密:以String密文输入,String明文输出
public void setDesString(String strMi) {
BASE64Decoder base64De = new BASE64Decoder();
try {
this.byteMi = base64De.decodeBuffer(strMi);
this.byteMing = this.getDesCode(byteMi);
this.strM = new String(byteMing, "UTF8");
} catch (Exception e) {
e.printStackTrace();
} finally {
base64De = null;
byteMing = null;
byteMi = null;
}
}

// 解密以byte[]密文输入,以byte[]明文输出
private byte[] getDesCode(byte[] byteD) {
Cipher cipher;
byte[] byteFina = null;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}

// 返回加密后的密文strMi
public String getStrMi() {
return strMi;
}

// 返回解密后的明文
public String getStrM() {
return strM;
}

public static void main(String[] args) {
Encrypt pt = new Encrypt();
String key = "06xbc"; // 初始化密钥。
pt.setKey(key); // 调用set函数设置密钥。
pt.setEncString("呵呵哒");// 将要加密的明文传送给Encrypt.java进行加密计算。
String Mi = pt.getStrMi(); // 调用get函数获取加密后密文。
System.out.println(Mi);
pt.setDesString(Mi); // 将要解密的密文传送给Encrypt.java进行解密计算。
String M = pt.getStrM(); // 调用get函数获取解密后明文。
System.out.println(M);
}
}
Encrypt pt = new Encrypt();
String key = "jmcjr2015"; // 初始化密钥。
pt.setKey(key);// 调用set函数设置密钥。

--加密
pt.setEncString(""）;//对支付串内东西加密
pt.getStrMi();//获得加密后的东西

--解密
pt.setDesString(）;//对加密的东西解密
pt.getStrM();//获得解密后的原东西