复制代码 代码如下:

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.CipherInputStream;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import javax.crypto.spec.IvParameterSpec;

public class DesTool {

private static final String PASSKEY = "afasdf";

private static final String DESKEY = "asfsdfsdf";

/**

* @Comments ：对文件进行加密

* @param filePath 要加密的文件路径

* @param fileName 文件

* @param mode 加密模式 加密：Cipher.ENCRYPT_MODE 解密：Cipher.DECRYPT_MODE

* @return

*/

public static String encoderOrdecoder(String filePath, String fileName, int mode) {

InputStream is = null;

OutputStream out = null;

CipherInputStream cis = null;

try {

SecureRandom sr = new SecureRandom();

DESKeySpec dks = new DESKeySpec(DESKEY.getBytes());

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey securekey = keyFactory.generateSecret(dks);

IvParameterSpec iv = new IvParameterSpec(PASSKEY.getBytes());

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

cipher.init(mode, securekey, iv, sr);

File encoderFile = new File(filePath + File.separator + "encoder");

if (!encoderFile.exists()) {

encoderFile.mkdir();

}

is = new FileInputStream(filePath + File.separator + fileName);

out = new FileOutputStream(filePath + File.separator + "encoder"

+ File.separator + fileName);

cis = new CipherInputStream(is, cipher);

byte[] buffer = new byte[1024];

int r;

while ((r = cis.read(buffer)) > 0) {

out.write(buffer, 0, r);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (is != null) {

is.close();

}

if (cis != null) {

cis.close();

}

if (out != null) {

out.close();

}

} catch (Exception e1){

}

}

return filePath + File.separator + "encoder" + File.separator

+ fileName;

}

/**@Comments ：对字符串进行加密

* @param src 源字符串

* @param mode 加密模式 加密：Cipher.ENCRYPT_MODE 解密：Cipher.DECRYPT_MODE

* @return

*/

public static String encoderOrdecoder( String src, int mode) {

String tag="";

InputStream is = null;

OutputStream out = null;

CipherInputStream cis = null;

try {

SecureRandom sr = new SecureRandom();

DESKeySpec dks = new DESKeySpec(DESKEY.getBytes());

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey securekey = keyFactory.generateSecret(dks);

IvParameterSpec iv = new IvParameterSpec(PASSKEY.getBytes());

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

cipher.init(mode, securekey, iv, sr);

cis = new CipherInputStream(new ByteArrayInputStream(src.getBytes()) , cipher);

out=new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int r;

while ((r = cis.read(buffer)) > 0) {

out.write(buffer, 0, r);

}

tag=out.toString();

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (is != null) {

is.close();

}

if (cis != null) {

cis.close();

}

if (out != null) {

out.close();

}

} catch (Exception e1){

}

}

return tag;

}

public static void main(String[] args) {

System.out.println("aaa");

String t=encoderOrdecoder("aaa", Cipher.ENCRYPT_MODE );

System.out.println(t);

System.out.println(encoderOrdecoder(t, Cipher.DECRYPT_MODE ));

}

}