用Base64编码图片

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.stream.FileImageOutputStream;
import org.apache.commons.codec.binary.Base64;

public class Base64Demo_01 {
    public static void main(String[] args) throws FileNotFoundException {
        //将图片文件转化为字节数组，并对其进行Base64编码处理
        File file = new File("c:\\a.jpg");
        FileInputStream fin = null;
        byte[] data = null;
        try {
            fin = new FileInputStream(file);
            data = new byte[fin.available()];
            fin.read(data);
            fin.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        //查看编码后生成字符串
        String encodeStr = Base64.encodeBase64String(data);
        System.out.println(encodeStr);
        File outFile = new File("c:\\save.txt");
        FileOutputStream fos = new FileOutputStream(outFile);
        try {
            fos.write(encodeStr.getBytes());
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        
        //按字节编码
        byte[] encodeImage = Base64.encodeBase64(data);
        //生成编码后的jpg图片
        File imgFile = new File("c:\\b.jpg");
        try {
            FileImageOutputStream fos1 = new FileImageOutputStream (imgFile);
            fos1.write(encodeImage);
            fos1.flush();
            fos1.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        System.out.println();
        

    }
}