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 ));
}
}