文件加解密
package com.asc;import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;/** * 加解密Excel * @author liuli * */public class ExcelReaderTest {public static void main(String args[]){//encryptExcelFile();decryptExcelFile();}/** * excel加密 */private static void encryptExcelFile() {FileInputStream inputStream=null;//声明一个输入流FileOutputStream outputStream=null;//声明一个输出流//构造密钥,指定算法为AESSecretKeySpec skeySpec=new SecretKeySpec("AgilesClientLons".getBytes(), "AES");try {//设置密码算法为：AES，模式为ECB，填充模式为PKCS5PaddingCipher cipher=Cipher.getInstance("AES/ECB/PKCS5Padding");//初始化cipher为加密算法cipher.init(Cipher.ENCRYPT_MODE, skeySpec);inputStream=new FileInputStream(new File("f://excelTest.xlsx"));//得到未加密码的文件流outputStream=new FileOutputStream(new File("f://excel_encrypt.xlsx"));//构造一个缓冲区byte [] buffer=new byte[1024];int len=0;while((len=inputStream.read(buffer))!=-1){outputStream.write(cipher.update(buffer,0,len));}outputStream.write(cipher.doFinal());outputStream.flush();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(null!=inputStream){try {inputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(null!=outputStream){try {outputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}/** * excel解密 */private static void decryptExcelFile() {FileInputStream inputStream = null;// 声明一个输入流FileOutputStream outputStream = null;// 声明一个输出流// 构造密钥，指定算法为AESSecretKeySpec skeySpec = new SecretKeySpec("AgilesClientLons".getBytes(), "AES");try {// 设置密码算法为AES，模式为ECB，填充模式为：PKCS5PaddingCipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 初始化设置为解密cipher.init(Cipher.DECRYPT_MODE, skeySpec);inputStream = new FileInputStream(new File("F://014901//20110302124720136_TSKF_SAL_CUR_20101201.XLS"));// 得到test.xls的文件流outputStream = new FileOutputStream("F://014901_decrypt//20110302124720136_TSKF_SAL_CUR_20101201_decrypt.xls");// 声明一个缓冲区byte[] buffer = new byte[1024];int lenght = 0;while ((lenght = inputStream.read(buffer)) != -1) {outputStream.write(cipher.update(buffer, 0, lenght));//复制}outputStream.write(cipher.doFinal());// 结束加密outputStream.flush();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (null != inputStream) {try {inputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (null != outputStream) {try {outputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}/** * file change byte * * @param f * @return */public byte[] getBytesFromFile(File f) {if (f == null) {return null;}try {FileInputStream stream = new FileInputStream(f);ByteArrayOutputStream out = new ByteArrayOutputStream(2046);byte[] b = new byte[2046];int n;while ((n = stream.read(b)) != -1) {out.write(b, 0, n);}stream.close();out.close();return out.toByteArray();} catch (IOException e) {e.printStackTrace();}return null;}/** * byte change file * * @param b * @param outputFile * @return */public boolean getFileFromBytes(byte[] b, String outputFile) {BufferedOutputStream stream = null;File file = null;try {file = new File(outputFile);if (!file.exists()) {file.mkdirs();}FileOutputStream fstream = new FileOutputStream(file);stream = new BufferedOutputStream(fstream);stream.write(b);return true;} catch (Exception e) {e.printStackTrace();} finally {if (stream != null) {try {stream.close();} catch (IOException e1) {e1.printStackTrace();}}}return false;}}