Java POI导出富文本的内容到word文档-Toy模板网

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一、需求：

当创建使用富文本编辑器，操作完的数据，传输到后台都是带有html标签的。

如：<h1>标题头</h1><h2>第二个标题</h2><a href="www.baidu.com">百度搜索</a>

我们想把富文本数据转换为Word内容。

二，依赖

<!-- 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>

三、解决方案

Word是完全支持html标签的，但是我们获取到的富文本内容并不是完整的html代码，所有我们需要先补全html标签，然后转码，然后输出。文章来源地址https://www.toymoban.com/news/detail-707603.html

1，接口类

package com.zl.exportword;

import org.apache.commons.lang3.StringUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * @author lei
 * @version 1.0
 * @date 2022/11/14 10:25
 */
@RestController
@RequestMapping("/export")
public class ExportController {

    @RequestMapping(value = "/exportWord")
    public void export(HttpServletRequest request, HttpServletResponse response) throws Exception {
        try {
            String tmpContent = "<h1>如何将富文本内容导出到word文档</h1><p style=\"color:red;font-size:20px;\">采用poi将富文本内容导出到word文档</p><div style=\"background-color:green;\">这是有背景颜色的div内容</div>\n" +
                    "<img src=\"这里写base64后的图片编码\">这是base64编码后的图片";

            // 获取img图片标签
            // 1.Jsoup解析html
            Document document = Jsoup.parse(tmpContent);
            // 获取所有img图片标签
            Elements img = document.getElementsByTag("img");
            int index = 0;
            List<String> imgBase64List = new ArrayList<>();
            for (Element element : img) {
                imgBase64List.add(element.attr("src"));
                // 处理特殊符号
                String attrData = element.attr("src");
                // base64编码后可能包含 + 特殊字符,所以需要转义
                attrData = attrData.replaceAll("\\+", "\\\\+");
                tmpContent = tmpContent.replaceAll(attrData, "{{image_src" + index + "}}");
                index++;
            }
            // 缩放图片大小,然后重新base64编码后替换到富文本内容里面导出word
            index = 0;
            String prefix = "data:image/png;base64,"; // base64编码前缀
            for (String base64 : imgBase64List) {
                if (StringUtils.isNotBlank(base64)) {
                    // 缩小图片
                    base64 = base64.replaceAll(prefix, "");
                    BufferedImage bufferedImage = ImageUtils.bytesToBufferedImage(ImageUtils.base64ToByte(base64));
                    if (bufferedImage == null) {
                        tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", "");
                    } else {
                        int height = bufferedImage.getHeight();
                        int width = bufferedImage.getWidth();
                        // 如果图片宽度大于650,图片缩放
                        //System.out.println("----"+width+"-----"+height);
                        if (width > 650) {
                            //高度等比缩放
                            height = (int)(height*650.0/width);
                            BufferedImage imgZoom = ImageUtils.resizeImage(bufferedImage, 700, height);
                            String imageToBase64 = ImageUtils.imageToBase64(ImageUtils.imageToBytes(imgZoom));
                            tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", prefix + imageToBase64);
                        } else {
                            tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", prefix + base64);
                        }
                    }
                } else {
                    tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", "");
                }
                index++;
            }
            // 执行导出操作
            WordUtil.exportHtmlToWord(request, response, tmpContent, "富文本内容导出word");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    /**
     * 倒入本地测试
     * @throws Exception
     */
    @RequestMapping(value = "/export")
    public void export() throws Exception {
        try {
            StringBuilder sb = new StringBuilder("<h1>如何将富文本内容导出到word文档</h1><p style=\"color:red;font-size:20px;\">采用poi将富文本内容导出到word文档</p><div style=\"background-color:green;\">这是有背景颜色的div内容</div>\n" +
                    "<img src=\"").append("");
　　　　　　　//提前转换过base64编码的图片，由于编码文本太长，我提前存储到txt中，再通过io流读取出来
            File file = new File("/Users/lei/base.txt");
            FileInputStream fileInputStream = new FileInputStream(file);
            BufferedInputStream bis = new BufferedInputStream(fileInputStream);
            byte[] bytes = new byte[1024];
            int len = -1;
            while ((len=bis.read(bytes))!=-1){
                sb.append(new String(bytes, 0, len));
            }


            sb.append("\">这是base64编码后的图片");
            String tmpContent = sb.toString();

            // 获取img图片标签
            // 1.Jsoup解析html
            Document document = Jsoup.parse(tmpContent);
            // 获取所有img图片标签
            Elements imgs = document.getElementsByTag("img");
            int index = 0;
            List<String> imgBase64List = new ArrayList<>();
            for (Element element : imgs) {
                imgBase64List.add(element.attr("src"));
                // 处理特殊符号
                String attrData = element.attr("src");
                // base64编码后可能包含 + 特殊字符,所以需要转义
                attrData = attrData.replaceAll("\\+", "\\\\+");
                tmpContent = tmpContent.replaceAll(attrData, "{{image_src" + index + "}}");
                index++;
            }
            // 缩放图片大小,然后重新base64编码后替换到富文本内容里面导出word
            index = 0;
            String prefix = "data:image/png;base64,"; // base64编码前缀
            for (String base64 : imgBase64List) {
                if (StringUtils.isNotBlank(base64)) {
                    // 缩小图片
                    base64 = base64.replaceAll(prefix, "");
                    BufferedImage bufferedImage = ImageUtils.bytesToBufferedImage(ImageUtils.base64ToByte(base64));
                    if (bufferedImage == null) {
                        tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", "");
                    } else {
                        int height = bufferedImage.getHeight();
                        int width = bufferedImage.getWidth();
                        // 如果图片宽度大于650,图片缩放
                        System.out.println("----"+width+"-----"+height);
                        if (width > 650) {
                            //高度等比缩放
                            height = (int)(height*650.0/width);
                            BufferedImage imgZoom = ImageUtils.resizeImage(bufferedImage, 650, height);
                            String imageToBase64 = ImageUtils.imageToBase64(ImageUtils.imageToBytes(imgZoom));
                            tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", prefix + imageToBase64);
                        } else {
                            tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", prefix + base64);
                        }
                    }
                } else {
                    tmpContent = tmpContent.replaceAll("\\{\\{image_src" + index + "}}", "");
                }
                index++;
            }
            // 执行导出操作
            WordUtil.exportHtmlToWord("/Users/lei/", tmpContent, "富文本内容导出word.docx");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

2，工具类

package com.zl.exportword;

import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.poifs.filesystem.DocumentEntry;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;


/**
 * poi操作word工具类
 * @author lei
 * @version 1.0
 * @date 2022/11/14 10:23
 */
public class WordUtil {

    /**
     * 导出富文本内容到word
     * @param request
     * @param response
     * @param content 输出内容
     * @param fileName 导出文件名称
     * @throws Exception
     */
    public static void exportHtmlToWord(HttpServletRequest request, HttpServletResponse response, String content, String fileName) throws Exception {
        //图片转为base64方法
        //String imagebase64 = getImageStr(imagePath); 
        // 拼接html格式内容
        StringBuffer sbf = new StringBuffer();
        // 这里拼接一下html标签,便于word文档能够识别
        sbf.append("<html " +
                "xmlns:v=\"urn:schemas-microsoft-com:vml\" xmlns:o=\"urn:schemas-microsoft-com:office:office\" xmlns:w=\"urn:schemas-microsoft-com:office:word\" xmlns:m=\"http://schemas.microsoft.com/office/2004/12/omml\" xmlns=\"http://www.w3.org/TR/REC-html40\"" + //将版式从web版式改成页面试图
                ">");
        sbf.append("<head>" +
                "<!--[if gte mso 9]><xml><w:WordDocument><w:View>Print</w:View><w:TrackMoves>false</w:TrackMoves><w:TrackFormatting/><w:ValidateAgainstSchemas/><w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid><w:IgnoreMixedContent>false</w:IgnoreMixedContent><w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText><w:DoNotPromoteQF/><w:LidThemeOther>EN-US</w:LidThemeOther><w:LidThemeAsian>ZH-CN</w:LidThemeAsian><w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript><w:Compatibility><w:BreakWrappedTables/><w:SnapToGridInCell/><w:WrapTextWithPunct/><w:UseAsianBreakRules/><w:DontGrowAutofit/><w:SplitPgBreakAndParaMark/><w:DontVertAlignCellWithSp/><w:DontBreakConstrainedForcedTables/><w:DontVertAlignInTxbx/><w:Word11KerningPairs/><w:CachedColBalance/><w:UseFELayout/></w:Compatibility><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><m:mathPr><m:mathFont m:val=\"Cambria Math\"/><m:brkBin m:val=\"before\"/><m:brkBinSub m:val=\"--\"/><m:smallFrac m:val=\"off\"/><m:dispDef/><m:lMargin m:val=\"0\"/> <m:rMargin m:val=\"0\"/><m:defJc m:val=\"centerGroup\"/><m:wrapIndent m:val=\"1440\"/><m:intLim m:val=\"subSup\"/><m:naryLim m:val=\"undOvr\"/></m:mathPr></w:WordDocument></xml><![endif]-->" +
                "</head>");
        sbf.append("<body>");
        // 富文本内容
        sbf.append(content);
        sbf.append("</body></html>");

        // 必须要设置编码,避免中文就会乱码
        byte[] b = sbf.toString().getBytes("GBK");
        // 将字节数组包装到流中
        ByteArrayInputStream bais = new ByteArrayInputStream(b);
        POIFSFileSystem poifs = new POIFSFileSystem();
        DirectoryEntry directory = poifs.getRoot();
        // 这代码不能省略,否则导出乱码。
        DocumentEntry documentEntry = directory.createDocument("WordDocument", bais);
        //输出文件
        request.setCharacterEncoding("utf-8");
        // 导出word格式
        response.setContentType("application/msword");
        response.addHeader("Content-Disposition", "attachment;filename=" +
                new String(fileName.getBytes("GB2312"),"iso8859-1") + ".doc");
        ServletOutputStream ostream = response.getOutputStream();
        poifs.writeFilesystem(ostream);
        bais.close();
        ostream.close();
    }

    /**
     * 富文本内容到word（本地）
     * @param content 输出内容
     * @param fileName 导出文件名称
     * @throws Exception
     */
    public static void exportHtmlToWord(String filepath, String content, String fileName) throws Exception {
        // 拼接html格式内容
        StringBuffer sbf = new StringBuffer();
        // 这里拼接一下html标签,便于word文档能够识别
        sbf.append("<html " +
                "xmlns:v=\"urn:schemas-microsoft-com:vml\" xmlns:o=\"urn:schemas-microsoft-com:office:office\" xmlns:w=\"urn:schemas-microsoft-com:office:word\" xmlns:m=\"http://schemas.microsoft.com/office/2004/12/omml\" xmlns=\"http://www.w3.org/TR/REC-html40\"" + //将版式从web版式改成页面试图
                ">");
        sbf.append("<head>" +
                "<!--[if gte mso 9]><xml><w:WordDocument><w:View>Print</w:View><w:TrackMoves>false</w:TrackMoves><w:TrackFormatting/><w:ValidateAgainstSchemas/><w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid><w:IgnoreMixedContent>false</w:IgnoreMixedContent><w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText><w:DoNotPromoteQF/><w:LidThemeOther>EN-US</w:LidThemeOther><w:LidThemeAsian>ZH-CN</w:LidThemeAsian><w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript><w:Compatibility><w:BreakWrappedTables/><w:SnapToGridInCell/><w:WrapTextWithPunct/><w:UseAsianBreakRules/><w:DontGrowAutofit/><w:SplitPgBreakAndParaMark/><w:DontVertAlignCellWithSp/><w:DontBreakConstrainedForcedTables/><w:DontVertAlignInTxbx/><w:Word11KerningPairs/><w:CachedColBalance/><w:UseFELayout/></w:Compatibility><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><m:mathPr><m:mathFont m:val=\"Cambria Math\"/><m:brkBin m:val=\"before\"/><m:brkBinSub m:val=\"--\"/><m:smallFrac m:val=\"off\"/><m:dispDef/><m:lMargin m:val=\"0\"/> <m:rMargin m:val=\"0\"/><m:defJc m:val=\"centerGroup\"/><m:wrapIndent m:val=\"1440\"/><m:intLim m:val=\"subSup\"/><m:naryLim m:val=\"undOvr\"/></m:mathPr></w:WordDocument></xml><![endif]-->" +
                "</head>");
        sbf.append("<body>");
        // 富文本内容
        sbf.append(content);
        sbf.append("</body></html>");

        // 必须要设置编码,避免中文就会乱码
        byte[] b = sbf.toString().getBytes("GBK");
        // 将字节数组包装到流中
        ByteArrayInputStream bais = new ByteArrayInputStream(b);
        POIFSFileSystem poifs = new POIFSFileSystem();
        DirectoryEntry directory = poifs.getRoot();
        // 这代码不能省略,否则导出乱码。
        DocumentEntry documentEntry = directory.createDocument("WordDocument", bais);

        FileOutputStream out = new FileOutputStream(new File(filepath+fileName));
        poifs.writeFilesystem(out);
        bais.close();
        out.close();
    }
}

package com.zl.exportword;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;


/**
 * 图片处理工具类
 * @author lei
 * @date 2022/11/14 10:20
 * @version 1.0
 */
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;
    }

    //图片转化成base64字符串
    public static String getImageStr(String imgPath) throws IOException {
        File file = new File(imgPath);
        String fileContentBase64 = null;
        if(file.exists()){
            String fileType = imgPath.substring(imgPath.length()-3);
            String base64Str = "data:" + fileType + ";base64,";
            String content = null;
            //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
            InputStream in = null;
            byte[] data = null;
            //读取图片字节数组
            try {
                in = new FileInputStream(file);
                data = new byte[in.available()];
                in.read(data);
                in.close();
                //对字节数组Base64编码
                if (data == null || data.length == 0) {
                    return null;
                }
                //content = Base64.encodeBytes(data);
                content = new BASE64Encoder().encode(data);
                if (content == null || "".equals(content)) {
                    return null;
                }
                // 缩小图片
                if (StringUtils.isNotBlank(content)) {
                    BufferedImage bufferedImage = ImageUtils.bytesToBufferedImage(ImageUtils.base64ToByte(content));
                    if (bufferedImage != null){
                        int height = bufferedImage.getHeight();
                        int width = bufferedImage.getWidth();
                        // 如果图片宽度大于650,图片缩放
                        if (width > 500) {
                            //高度等比缩放
                            height = (int)(height*500.0/width);
                            BufferedImage imgZoom = ImageUtils.resizeImage(bufferedImage, 500, height);
                            content = ImageUtils.imageToBase64(ImageUtils.imageToBytes(imgZoom));
                        }
                    }
                }
                fileContentBase64 = base64Str + content;
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (in != null) {
                    in.close();
                }
            }
        }

        return fileContentBase64;
    }
}

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