1、编码和解码下面的代码示例看：

import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;

import javax.imageio.ImageIO;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

/**

 * @author zxn

 * @version 创建时间：2014-7-2 上午11:40:40

 *

 */

public class ImageUtils {

    /**

     * 将网络图片进行Base64位编码

     *

     * @param imgUrl

     *            图片的url路径，如http://.....xx.jpg

     * @return

     */

    public static String encodeImgageToBase64(URL imageUrl) {// 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

        ByteArrayOutputStream outputStream = null;

        try {

            BufferedImage bufferedImage = ImageIO.read(imageUrl);

            outputStream = new ByteArrayOutputStream();

            ImageIO.write(bufferedImage, "jpg", outputStream);

        } catch (MalformedURLException e1) {

            e1.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        // 对字节数组Base64编码

        BASE64Encoder encoder = new BASE64Encoder();

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

    }

    /**

     * 将本地图片进行Base64位编码

     *

     * @param imgUrl

     *            图片的url路径，如http://.....xx.jpg

     * @return

     */

    public static String encodeImgageToBase64(File imageFile) {// 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

        ByteArrayOutputStream outputStream = null;

        try {

            BufferedImage bufferedImage = ImageIO.read(imageFile);

            outputStream = new ByteArrayOutputStream();

            ImageIO.write(bufferedImage, "jpg", outputStream);

        } catch (MalformedURLException e1) {

            e1.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        // 对字节数组Base64编码

        BASE64Encoder encoder = new BASE64Encoder();

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

    }

    /**

     * 将Base64位编码的图片进行解码，并保存到指定文件夹

     *

     * @param base64

     *            base64编码的图片信息

     * @return

     */

    public static void decodeBase64ToImage(String base64, String path,

            String imgName) {

        BASE64Decoder decoder = new BASE64Decoder();

        try {

            FileOutputStream write = new FileOutputStream(new File(path

                    + imgName));

            byte[] decoderBytes = decoder.decodeBuffer(base64);

            write.write(decoderBytes);

            write.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

2、怎样直接在页面上显示base64编码的图片？

样比例如以下：

<html>

<body>

<img src='data:image/jpg;base64,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'/>

</body>

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