图片与base64互转

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;

/**
 * @Author ZhengQinfeng
 * @Date 2020/6/18 21:31
 * @dec
 */
public class ImageBase64 {
    /**
     * 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
     *
     * @param imgPath 图片文件
     * @return base64转码字符串
     */
    public static String GetImageStr(String imgPath) {//
        String imgFile = imgPath;// 待处理的图片
        InputStream in = null;
        byte[] data = null;
        String encode = null; // 返回Base64编码过的字节数组字符串
        // 对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        try {
            // 读取图片字节数组
            in = new FileInputStream(imgFile);
            data = new byte[in.available()];
            in.read(data);
            encode = encoder.encode(data);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return encode;
    }

    /**
     * 对字节数组字符串进行Base64解码并生成图片.
     * 使用前端框vant上传图片,转码成base64之后, 需要截取掉"data:image/jpeg;base64,", 不然会失败
     *
     * @param imgData     base64字符串
     * @param imgFilePath 生成的图片文件
     */

    public static void GenerateImage(String imgData, String imgFilePath) { //
        if (imgData == null) {// // 图像数据为空
            return;
        }
        BASE64Decoder decoder = new BASE64Decoder();
        OutputStream out = null;
        try {
            out = new FileOutputStream(imgFilePath);
            // Base64解码
            byte[] b = decoder.decodeBuffer(imgData);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {// 调整异常数据
                    b[i] += 256;
                }
            }
            out.write(b);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) throws IOException {
        String s = GetImageStr("D:\app\image\180817_37bdi0ji0j6bc58jb3j616b71l1dj_640x960.jpg");
        System.out.println(s);
        GenerateImage(s, "D:\app\image\1111.jpg");
    }
}