【技术】Spring Boot 将 Word 转换为 PDF 2.0 版本

时间：2024-04-22 07:24:00

之前写过一篇 Spring Boot 将 Word 转换为 PDF 的文章，但是有评论说导入依赖有问题，还存在依赖冲突的问题。索性再来一个完整版的代码，之前的完整版代码找不到了，又重新整理了一下，依赖导入和之前不太一样，代码写法类似。

1、导入依赖
核心依赖：

<!-- Apache POI -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
</dependency>

<!-- PdfConverter -->
<dependency>
    <groupId>fr.opensagres.xdocreport</groupId>
    <artifactId>org.apache.poi.xwpf.converter.pdf</artifactId>
    <version>1.0.6</version>
</dependency>

完整 pom.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.18</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.riu</groupId>
    <artifactId>spring-boot-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-demo</name>
    <description>spring-boot-demo</description>
    <properties>
        <java.version>8</java.version>
    </properties>
    <dependencies>
        <!-- Web 启动器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Thymeleaf 启动器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!-- Apache POI -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.15</version>
        </dependency>

        <!-- PdfConverter -->
        <dependency>
            <groupId>fr.opensagres.xdocreport</groupId>
            <artifactId>org.apache.poi.xwpf.converter.pdf</artifactId>
            <version>1.0.6</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2、用于上传文件的页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/w2p/convert" method="post" enctype="multipart/form-data">
    <input type="file" name="file"><input type="submit" value="转换"/>
</form>
[[${result}]]
</body>
</html>

3、控制层代码

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

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

@Controller
@RequestMapping("/w2p")
public class FileConversionController {

    /**
     * 跳转 w2p 页面，提交文件
     * @return
     */
    @GetMapping
    public String w2p(){
        return "/w2p/w2p";
    }

    /**
     * 文件转换
     *
     * @param file
     * @return
     */
    @PostMapping("/convert")
    public ResponseEntity<byte[]> convertWordToPdf(@RequestParam("file") MultipartFile file) {
        try {
            // 创建 word 临时文件对象
            File wordFile = File.createTempFile("word", ".docx");
            // 临时 word 文件写入磁盘
            file.transferTo(wordFile);

            // 建 pdf 临时文件对象
            File pdfFile = File.createTempFile("pdf", ".pdf");

            // 调用转换工具类
            WordToPdfConverter converter = new WordToPdfConverter();
            // 转换 PDF
            converter.convertToPdf(wordFile, pdfFile);


            /* PDF 文件下载 */
            FileInputStream fis = new FileInputStream(pdfFile);
            byte[] bytes = new byte[fis.available()];
            fis.read(bytes);


            // 删除 word 临时文件
            wordFile.delete();
            fis.close();
            pdfFile.delete();

            // 设置下载的响应头信息
            HttpHeaders hh = new HttpHeaders();
            hh.setContentDispositionFormData("attachement", pdfFile.getName());

            return new ResponseEntity<byte[]>(bytes,  hh, HttpStatus.OK);
            /* PDF 文件下载 */
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

4、PDF 转换类

import org.apache.poi.xwpf.converter.pdf.PdfConverter;
import org.apache.poi.xwpf.usermodel.XWPFDocument;

import java.io.*;

public class WordToPdfConverter {
    public void convertToPdf(File wordFile, File pdfFile) throws IOException {
        InputStream inputStream = null;
        OutputStream outputStream = null;
        XWPFDocument document = null;
        try {
            // 文件输入流
            inputStream = new FileInputStream(wordFile);
            // 文件输出流
            outputStream = new FileOutputStream(pdfFile);

            document = new XWPFDocument(inputStream);
            PdfConverter.getInstance().convert(document, outputStream, null);
        } catch (IOException e){
            e.printStackTrace();
        } finally {
            // 释放资源
            document.close();
            outputStream.close();
            inputStream.close();
        }
    }
}

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