java图片生成图片base64

你可以使用Java的`java.awt.Image`和`javax.imageio.ImageIO`类来生成图片，并将其转换为Base64编码。以下是一个示例代码：

import java.awt.*;
import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import java.util.Base64;

public class ImageToBase64 {
    public static void main(String[] args) {
        try {
            // 读取原始图片
            File inputFile = new File("input.jpg");
            BufferedImage originalImage = ImageIO.read(inputFile);

            // 创建新的图片
            BufferedImage newImage = new BufferedImage(originalImage.getWidth(), originalImage.getHeight(), BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics = newImage.createGraphics();
            graphics.drawImage(originalImage, 0, 0, null);
            graphics.dispose();

            // 将图片转换为Base64编码
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(newImage, "jpg", baos);
            byte[] imageBytes = baos.toByteArray();
            String base64Image = Base64.getEncoder().encodeToString(imageBytes);

            System.out.println("Base64编码的图片:\n" + base64Image);
        } catch (IOException e) {