ASCTest

package com.asc.test;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;

public class TestFileAsc {
	/**
	 * 解密
	 * 
	 * @param byteArray
	 * @return
	 */
	public byte[] ascTest(byte[] byteArray) {

		try {
			SecretKeySpec skeySpec = new SecretKeySpec(
					"AgilesClientLons".getBytes(), "AES");
			Cipher cipher = Cipher.getInstance("AES");
			cipher.init(Cipher.DECRYPT_MODE, skeySpec);
			byte[] decryptTemp = cipher.doFinal(byteArray);
			return decryptTemp;
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return null;

	}

	/**
	 * 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;
	}

	public static void main(String[] args) {
		TestFileAsc testFileAsc = new TestFileAsc();
		String filePath = "d://20110307115020172_TSKF_SAL_CUR_20110307030817.xls";
		File file = new File(filePath);
		byte[] ascByte = testFileAsc.getBytesFromFile(file);
		byte[] outByte = testFileAsc.ascTest(ascByte);
		String outPutFilePath = "e://data//txt.txt";
		if(testFileAsc.getFileFromBytes(outByte, outPutFilePath)){
			System.out.println("====file mkdirs ok" );
		}

	}
}