Springboot实现富文本(Html)内容转Word(包含图片)

在Java中经常会碰到富文本使用场景，有些需求则需要将富文本内容转换为Word，并包含图片，没接触过的同学可能一开始会感觉头大，其实可以使用Apache POI库来进行实现。以下是一个简单的例子。

引入本次需要的Maven依赖包

<!--富文本转word begin-->
    <!-- jsoup依赖  主要是解析图片标签，然后缩放图片大小-->
    <dependency>
      <groupId>org.jsoup</groupId>
      <artifactId>jsoup</artifactId>
      <version>1.12.1</version>
    </dependency>
    <!-- poi依赖-->
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi</artifactId>
      <version>4.1.0</version>
    </dependency>
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-ooxml</artifactId>
      <version>4.1.0</version>
    </dependency>
<!--富文本转word end-->

一：创建工具类
1.1、新增图片处理工具类

import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Base64;
import java.net.URL;

/**
 * @ClassName ImageUtils
 * @Description: 图片处理工具类
 * @Author bigearchart
 * @Date 2024/5/20
 * @Version V1.0
 **/
@Component
@Slf4j
public class ImageUtils {
    /**
     * 通过BufferedImage图片流调整图片大小
     */
    public static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) throws IOException {
        Image resultingImage = originalImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_AREA_AVERAGING);
        BufferedImage outputImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
        outputImage.getGraphics().drawImage(resultingImage, 0, 0, null);
        return outputImage;
    }

    /**
     * 返回base64图片
     * @param data
     * @return
     */
    public static String imageToBase64(byte[] data) {
        BASE64Encoder encoder = new BASE64Encoder();
        // 返回Base64编码过的字节数组字符串
        return encoder.encode(data);
    }

    /**
     * base64转换成byte数组
     * @param base64
     * @return
     * @throws IOException
     */
    public static byte[] base64ToByte(String base64) throws IOException {
        BASE64Decoder decoder = new BASE64Decoder();
        // 返回Base64编码过的字节数组字符串
        return decoder.decodeBuffer(base64);
    }

    /**
     * BufferedImage图片流转byte[]数组
     */
    public static byte[] imageToBytes(BufferedImage bImage) {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            ImageIO.write(bImage, "png", out);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return out.toByteArray();
    }

    /**
     * byte[]数组转BufferedImage图片流
     */
    public static BufferedImage bytesToBufferedImage(byte[] ImageByte) {
        ByteArrayInputStream in = new ByteArrayInputStream(ImageByte);
        BufferedImage image = null;
        try {
            image = ImageIO.read(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return image;
    }

    /**
     * 在线图片资源转base
     * @param imageUrl
     * @return
     * @throws IOException
     */
    public static String convertToBase64(String imageUrl) throws IOException {
        URL url = new URL(imageUrl);
        String fileType = imageUrl.substring(imageUrl.length()-3);
        String base64Str = "data:" + fileType + ";base64,";
        InputStream inputStream = url.openStream();
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        byte[] imageBytes = outputStream.toByteArray();
        String base64String = base64Str + Base64.getEncoder().encodeToString(imageBytes);
        return base64String;
    }

    //图片转化成base64字符串
    public static String getImageStr(String imgPath) throws IOException {
        File file = new File(imgPath);
        String fileContentBase64