SpringBoot+EasyPOI轻松实现Excel和Word导出PDF

<dependencies>
    <!-- Spring Boot Web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <!-- EasyPOI（Excel 导出） -->
    <dependency>
        <groupId>cn.afterturn</groupId>
        <artifactId>easypoi-base</artifactId>
        <version>4.4.0</version> <!-- 最新稳定版 -->
    </dependency>
    <dependency>
        <groupId>cn.afterturn</groupId>
        <artifactId>easypoi-web</artifactId>
        <version>4.4.0</version>
    </dependency>
    
    <!-- Aspose.Cells（Excel 转 PDF） -->
    <dependency>
        <groupId>com.aspose</groupId>
        <artifactId>aspose-cells</artifactId>
        <version>23.10</version>
    </dependency>
    
    <!-- Aspose.Words（Word 转 PDF） -->
    <dependency>
        <groupId>com.aspose</groupId>
        <artifactId>aspose-words</artifactId>
        <version>23.10</version>
    </dependency>
</dependencies>

@Data
@TableName("sys_employee")
// Excel 导出配置（文件名、工作表名）
@ExcelEntity(name = "员工信息表", sheetName = "员工信息")
public class Employee {
    @Excel(name = "ID", orderNum = "0", width = 10)  // 列名、顺序、列宽
    private Long id;

    @Excel(name = "姓名", orderNum = "1", width = 15)
    private String name;

    @Excel(name = "年龄", orderNum = "2", width = 10, replace = {"0_未知", "1_男", "2_女"})  // 数据替换
    private Integer gender;

    @Excel(name = "部门", orderNum = "3", width = 20)
    private String department;

    @Excel(name = "入职时间", orderNum = "4", width = 20, format = "yyyy-MM-dd")  // 日期格式
    private Date hireDate;
}

@Component
public class ExcelExportUtils {
    private static final Logger log = LoggerFactory.getLogger(ExcelExportUtils.class);

    /**
     * 生成 Excel Workbook（基于 EasyPOI）
     * @param dataList 数据列表
     * @param entityClass 实体类（含 @ExcelEntity 注解）
     * @return Workbook
     */
    public static <T> Workbook generateExcelWorkbook(List<T> dataList, Class<T> entityClass) {
        ExportParams exportParams = new ExportParams();
        exportParams.setSheetName("员工信息");  // 工作表名（与 @ExcelEntity 一致）
        exportParams.settitle("员工信息表");    // Excel 标题（顶部大标题）

        // 使用 EasyPOI 生成 Workbook
        return ExcelExportUtil.exportExcel(exportParams, entityClass, dataList);
    }
}

@Component
public class ExcelToPdfConverter {
    private static final Logger log = LoggerFactory.getLogger(ExcelToPdfConverter.class);

    /**
     * 将 Workbook 转换为 PDF 字节流（Aspose.Cells）
     * @param workbook Excel Workbook
     * @return PDF 字节流
     */
    public static ByteArrayOutputStream convertToPdf(Workbook workbook) throws Exception {
        // 1. 创建 PDF 保存选项（可选配置）
        PdfSaveOptions saveOptions = new PdfSaveOptions();
        saveOptions.setOnePagePerSheet(true);       // 每个工作表一页
        saveOptions.setFormat(PdfFormat.PdfA2B);    // 符合 PDF/A-2B 标准（可选）
        saveOptions.setCompressImages(true);        // 压缩图片（减小文件大小）
        saveOptions.setImageCompression(PdfImageCompressionType.MEDIUM);  // 图片压缩级别

        // 2. 转换为 PDF 字节流
        ByteArrayOutputStream pdfOutputStream = new ByteArrayOutputStream();
        workbook.save(pdfOutputStream, saveOptions);
        return pdfOutputStream;
    }
}

@RestController
@RequestMapping("/export")
public class ExportController {
    @Autowired
    private ExcelExportUtils excelExportUtils;
    @Autowired
    private ExcelToPdfConverter pdfConverter;

    @GetMapping("/excel-to-pdf")
    public void exportEmployeeToPdf(HttpServletResponse response) throws Exception {
        // 1. 模拟数据（实际从数据库查询）
        List<Employee> dataList = new ArrayList<>();
        dataList.add(new Employee(1L, "张三", 25, "技术部", new Date()));
        dataList.add(new Employee(2L, "李四", 30, "市场部", new Date()));

        // 2. 生成 Excel Workbook（EasyPOI）
        Workbook workbook = excelExportUtils.generateExcelWorkbook(dataList, Employee.class);

        // 3. 转换为 PDF 字节流（Aspose.Cells）
        ByteArrayOutputStream pdfOutputStream = pdfConverter.convertToPdf(workbook);

        // 4. 设置响应头（下载 PDF）
        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment; filename=employee_report.pdf");
        response.getOutputStream().write(pdfOutputStream.toByteArray());
        response.getOutputStream().flush();
        response.getOutputStream().close();
    }
}

@Component
public class WordDocumentBuilder {
    private static final Logger log = LoggerFactory.getLogger(WordDocumentBuilder.class);

    /**
     * 构建 Word 文档（Aspose.Words）
     * @param content 文档内容（文本+表格）
     * @return Document（Aspose.Words 文档对象）
     */
    public static Document buildWordDocument(String content) throws Exception {
        // 创建空白文档
        Document doc = new Document();
        DocumentBuilder builder = new DocumentBuilder(doc);

        // 写入标题
        builder.getFont().setName("微软雅黑");
        builder.getFont().setSize(16);
        builder.getFont().setBold(true);
        builder.writeln("员工信息报告");

        // 写入正文
        builder.getFont().setSize(12);
        builder.getFont().setBold(false);
        builder.writeln("以下是近期员工信息：");
        builder.writeln();

        // 写入表格（示例数据）
        builder.startTable();
        builder.insertCell();
        builder.write("ID");
        builder.insertCell();
        builder.write("姓名");
        builder.insertCell();
        builder.write("部门");
        builder.endRow();

        builder.insertCell();
        builder.write("1");
        builder.insertCell();
        builder.write("张三");
        builder.insertCell();
        builder.write("技术部");
        builder.endRow();

        builder.endTable();

        return doc;
    }
}

@Component
public class WordToPdfConverter {
    private static final Logger log = LoggerFactory.getLogger(WordToPdfConverter.class);

    /**
     * 将 Aspose.Words Document 转换为 PDF 字节流
     * @param document Word 文档对象
     * @return PDF 字节流
     */
    public static ByteArrayOutputStream convertToPdf(Document document) throws Exception {
        // 1. 配置 PDF 保存选项（可选）
        PdfSaveOptions saveOptions = new PdfSaveOptions();
        saveOptions.setCompressFonts(true);       // 压缩字体
        saveOptions.setUseHighQualityRendering(true);  // 高质量渲染

        // 2. 转换为 PDF 字节流
        ByteArrayOutputStream pdfOutputStream = new ByteArrayOutputStream();
        document.save(pdfOutputStream, saveOptions);
        return pdfOutputStream;
    }
}

@RestController
@RequestMapping("/export")
public class ExportController {
    @Autowired
    private WordDocumentBuilder wordBuilder;
    @Autowired
    private WordToPdfConverter wordPdfConverter;

    @GetMapping("/word-to-pdf")
    public void exportEmployeeToPdf(HttpServletResponse response) throws Exception {
        // 1. 构建 Word 文档（Aspose.Words）
        String content = "员工信息报告内容...";  // 实际从数据库或业务逻辑获取
        Document wordDoc = wordBuilder.buildWordDocument(content);

        // 2. 转换为 PDF 字节流（Aspose.Words）
        ByteArrayOutputStream pdfOutputStream = wordPdfConverter.convertToPdf(wordDoc);

        // 3. 设置响应头（下载 PDF）
        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment; filename=employee_report.pdf");
        response.getOutputStream().write(pdfOutputStream.toByteArray());
        response.getOutputStream().flush();
        response.getOutputStream().close();
    }
}

// 调用 LibreOffice 转换 Excel 到 PDF
public static void convertExcelToPdfWithLibreOffice(String excelPath, String pdfPath) throws IOException {
    String command = String.format(
        "libreoffice --headless --convert-to pdf --outdir %s %s",
        pdfPath, excelPath
    );
    Process process = Runtime.getRuntime().exec(command);
    int exitCode = process.waitFor();
    if (exitCode != 0) {
        throw new RuntimeException("LibreOffice 转换失败");
    }
}