package cn.com;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

public class Base64Test

{

    public static void main(String[] args)

    {

        String strImg = GetImageStr();

        System.out.println(strImg);

        GenerateImage(strImg);

    }

    //图片转化成base64字符串

    public static String GetImageStr()

    {//将图片文件转化为字节数组字符串，并对其进行Base64编码处理

        String imgFile = "d://test.jpg";//待处理的图片

        InputStream in = null;

        byte[] data = null;

        //读取图片字节数组

        try

        {

            in = new FileInputStream(imgFile);

            data = new byte[in.available()];

            in.read(data);

            in.close();

        }

        catch (IOException e)

        {

            e.printStackTrace();

        }

        //对字节数组Base64编码

        BASE64Encoder encoder = new BASE64Encoder();

        return encoder.encode(data);//返回Base64编码过的字节数组字符串

    }

    //base64字符串转化成图片

    public static boolean GenerateImage(String imgStr)

    {   //对字节数组字符串进行Base64解码并生成图片

        if (imgStr == null) //图像数据为空

            return false;

        BASE64Decoder decoder = new BASE64Decoder();

        try

        {

            //Base64解码

            byte[] b = decoder.decodeBuffer(imgStr);

            for(int i=0;i<b.length;++i)

            {

                if(b[i]<0)

                {//调整异常数据

                    b[i]+=256;

                }

            }

            //生成jpeg图片

            String imgFilePath = "d://222.jpg";//新生成的图片

            OutputStream out = new FileOutputStream(imgFilePath);

            out.write(b);

            out.flush();

            out.close();

            return true;

        }

        catch (Exception e)

        {

            return false;

        }

    }

}