Apache POI介绍

Apache POI是一个用于操作各种Microsoft Office格式文件的Java API。包括：Excel，Word，PowerPoint等。

功能

1. 操作Excel文件
2. 操作Word文件
3. 操作PowerPoint文件
4. 操作OLE2 Compound Document格式的文件

特点

1. 与Microsoft Office格式文件兼容。
2. 支持读写操作。
3. 提供丰富的API以及易用的操作方式。
4. 提供生成Excel的简化工具。

使用教程

1. 添加依赖

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>

2. 操作Excel文件

读取Excel文件

try {
    FileInputStream fileInputStream = new FileInputStream(new File("path/to/file.xlsx"));
    XSSFWorkbook workbook = new XSSFWorkbook(fileInputStream);
    XSSFSheet sheet = workbook.getSheetAt(0);
    for (Row row : sheet) {
        for (Cell cell : row) {
            switch (cell.getCellType()) {
                case STRING:
                    System.out.print(cell.getStringCellValue() + "\t");
                    break;
                case NUMERIC:
                    System.out.print(cell.getNumericCellValue() + "\t");
                    break;
                default:
                    System.out.println();
            }
        }
        System.out.println();
    }
    fileInputStream.close();
} catch (IOException e) {
    e.printStackTrace();
}

写入Excel文件

XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("Sheet1");
Row row = sheet.createRow(0);
Cell cell = row.createCell(0);
cell.setCellValue("Hello, World!");

try {
    FileOutputStream outputStream = new FileOutputStream("path/to/file.xlsx");
    workbook.write(outputStream);
    outputStream.close();
} catch (IOException e) {
    e.printStackTrace();
}

3. 操作Word文件

读取Word文件

try {
    XWPFDocument document = new XWPFDocument(new FileInputStream(new File("path/to/file.docx")));
    for (XWPFParagraph para : document.getParagraphs()) {
        System.out.println(para.getText());
    }
    document.close();
} catch (IOException e) {
    e.printStackTrace();
}

写入Word文件

XWPFDocument document = new XWPFDocument();
XWPFParagraph paragraph = document.createParagraph();
XWPFRun run = paragraph.createRun();
run.setText("Hello, World!");

try {
    FileOutputStream outputStream = new FileOutputStream("path/to/file.docx");
    document.write(outputStream);
    outputStream.close();
    document.close();
} catch (IOException e) {
    e.printStackTrace();
}

4. 操作PowerPoint文件

读取PowerPoint文件

try {
    XMLSlideShow slideShow = new XMLSlideShow(new FileInputStream(new File("path/to/file.pptx")));
    for (XSLFSlide slide : slideShow.getSlides()) {
        for (XSLFShape shape : slide.getShapes()) {
            if (shape instanceof XSLFTextShape) {
                System.out.println(((XSLFTextShape) shape).getText());
            }
        }
    }
    slideShow.close();
} catch (IOException e) {
    e.printStackTrace();
}

写入PowerPoint文件

XMLSlideShow slideShow = new XMLSlideShow();
XSLFSlide slide = slideShow.createSlide();
XSLFTextShape shape = slide.createTextBox();
shape.setText("Hello, World!");

try {
    FileOutputStream outputStream = new FileOutputStream("path/to/file.pptx");
    slideShow.write(outputStream);
    outputStream.close();
    slideShow.close();
} catch (IOException e) {
    e.printStackTrace();
}

结论

Apache POI是一个强大的Java API，用于操作各种Microsoft Office格式文件。它提供了易于使用的API和简化工具，可帮助程序员快速读取、创建和编辑Excel、Word和PowerPoint文件。如果你想扩展应用程序的功能并增强用户交互性，那么就试试Apache POI吧！