JAVA实现网络/本地图片转BASE64存储代码示例

            String encoder = "data:image/jpg;base64,"; //定义图片类型，方便前端直接使用
            ByteArrayOutputStream data = new ByteArrayOutputStream();
            URL url = new URL(picUrl);//picUrl为图片地址
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            InputStream is = connection.getInputStream();
            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = is.read(bytes)) != -1){
                data.write(bytes,0,len);
            }
            is.close();
            BASE64Encoder base64Encoder = new BASE64Encoder();
            encoder = encoder +  base64Encoder.encode(data.toByteArray()).replace("\r\n","").trim();//这里去掉结果里面的"\r\n"，也可以不去，但是不去的话需要使用的时候还是要去掉，所以为了方便就先去掉再存储

    String encoder = "data:image/jpg;base64,"; //定义图片类型，方便前端直接使用
    ByteArrayOutputStream data = new ByteArrayOutputStream();
    String filePath = "filePath";//这里的filePath为本地存放图片的地址
    FileInputStream is = new FileInputStream(filePath);
    byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = is.read(bytes)) != -1){
                data.write(bytes,0,len);
            }
            is.close();
            BASE64Encoder base64Encoder = new BASE64Encoder();
            encoder = encoder +  base64Encoder.encode(data.toByteArray()).replace("\r\n","").trim();//这里去掉结果里面的"\r\n"，也可以不去，但是不去的话需要使用的时候还是要去掉，所以为了方便就先去掉再存储

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Base64;
public class ImageUtil {
    /**
     * 图片转Base64码
     * @param src
     * @return
     */
    public static String convertImageToBase64Str(String src) {
        ByteArrayOutputStream baos = null;
        try {
            String suffix = src.substring(src.lastIndexOf(".") + 1);
            File imageFile = new File(src);
            BufferedImage bufferedImage = ImageIO.read(imageFile);
            baos = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, suffix, baos);
            byte[] bytes = baos.toByteArray();
            return Base64.getEncoder().encodeToString(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (baos != null) {
                    baos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    /**
     * Base64码转图片
     * @param base64String
     * @param newSrc
     */
    public static void convertBase64StrToImage(String base64String, String newSrc) {
        ByteArrayInputStream bais = null;
        try {
            String suffix = newSrc.substring(newSrc.lastIndexOf(".") + 1);
            byte[] bytes = Base64.getDecoder().decode(base64String);
            bais = new ByteArrayInputStream(bytes);
            BufferedImage bufferedImage = ImageIO.read(bais);
            File imageFile = new File(newSrc);
            ImageIO.write(bufferedImage, suffix, imageFile);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (bais != null) {
                    bais.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}