jsp将图片转为base64

可以使用Java的Base64类将图片转为base64编码。以下是一个示例代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Base64;

public class ImageToBase64 {
    public static void main(String[] args) {
        String imagePath = "path/to/image.jpg";
        String base64Image = getImageAsBase64(imagePath);
        System.out.println(base64Image);
    }

    private static String getImageAsBase64(String imagePath) {
        File file = new File(imagePath);
        try (FileInputStream imageInFile = new FileInputStream(file)) {
            byte[] imageData = new byte[(int) file.length()];
            imageInFile.read(imageData);
            return Base64.getEncoder().encodeToString(imageData);
        } catch (IOException e) {
            System.out.println("Error while reading image");
            return null;
        }
    }
}