base64加密图片

package com.way.base64;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.junit.Test;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
 * 目的：将公司的logo图片用base64弄后弄成xml传给客户端。
 * 目前的功能:将图片转成byte字节后加密
 * @author way
 *
 */
public class BASE64Coding {
	
	
	
	/**
	 * 测试成功的做法
	 */
	@Test
	public void encodImageByByte(){
		File src = new File("./user.gif");
		File dest = new File("./test.gif");
		try {
			InputStream inputStream = new FileInputStream(src);
			OutputStream outputStream  = new FileOutputStream(dest);
			BASE64Encoder base64Encoder = new sun.misc.BASE64Encoder();
			BASE64Decoder base64Decoder = new sun.misc.BASE64Decoder();
			
			byte[] b = new byte[new Long(src.length()).intValue()];
			inputStream.read(b);
			inputStream.close();
			String encode = base64Encoder.encode(b);
			byte[] decode = base64Decoder.decodeBuffer(encode);
			outputStream.write(decode);
			outputStream.flush();
			outputStream.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	/**
	 * 最开始的做法 （未成功）
	 * 1 流:与成功的做法不同，不是一次性全读,但是未成功？？？将byte[]容量扩大
	 * 2 String 与byte[]之间转化要加上charSet,并且这里必须是iso-8859-1？？？
	 * 3 最后进行write时仍然是不能成功???
	 */
	@Test
	public void encodeImage(){
		File src = new File("./user.gif");
		File dest = new File("./test.gif");
		try {
			InputStream inputStream = new FileInputStream(src);
			OutputStream outputStream  = new FileOutputStream(dest);
			String collectB = null;
//			StringBuilder builder = new StringBuilder();//未成功
//			byte[] b  = new byte[1024];
//			byte[] b = new byte[new Long(src.length()).intValue()];//成功 
			byte[] b  = new byte[20000];//成功
			int i=0;
			while((i=inputStream.read(b)) != -1){
				System.out.println(i);
				collectB = new String(b,0,i,"ISO-8859-1");
			}
			System.out.println(collectB.getBytes("ISO-8859-1").length);
			outputStream.write(collectB.getBytes("ISO-8859-1"));
			outputStream.flush();
			outputStream.close();
			inputStream.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

}