Java操作excel-POI

添加依赖项

这里直接给出Maven配置文件

 <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
<dependency>
    <groupId>dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>1.6.1</version>
</dependency>
   <dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>3.9</version>
</dependency> 
<dependency>
    <groupId>org.apache.xmlbeans</groupId>
    <artifactId>xmlbeans</artifactId>
    <version>2.3.0</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
</dependency>

读取excel

static void Write(String path) throws InvalidFormatException, IOException 
    {
    	FileInputStream file = new FileInputStream(new File(path));

        Workbook workbook = WorkbookFactory.create(file);//读取excel文件
        Sheet sheet = workbook.getSheetAt(0);//获取第一个sheet页
        //遍历行
        Iterator<Row> rowIterator = sheet.iterator();
        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();
            //遍历列
            Iterator<Cell> cellIterator = row.cellIterator();
            while (cellIterator.hasNext()) {

                Cell cell = cellIterator.next();

                switch (cell.getCellType()) {
                    case Cell.CELL_TYPE_BOOLEAN:
                        System.out.print(cell.getBooleanCellValue() + "		");//输出bool类型值
                        break;
                    case Cell.CELL_TYPE_NUMERIC:
                        System.out.print(cell.getNumericCellValue() + "		");//输出Int类型值
                        break;
                    case Cell.CELL_TYPE_STRING:
                        System.out.print(cell.getStringCellValue() + "		");//输出String类型值
                        break;
                }
            }
            System.out.println("");
        }
		file.close();
		FileOutputStream outFile =new FileOutputStream(new File(path));
		workbook.write(outFile);
		outFile.close();
    }

更新excel

static void Update(String path) throws InvalidFormatException, IOException 
    {
    	FileInputStream file = new FileInputStream(new File(path));

        Workbook workbook = WorkbookFactory.create(file);
        Sheet sheet = workbook.getSheetAt(0);
        
		Cell cell = sheet.getRow(1).getCell(2);//读取第2行第3个
		cell.setCellValue(12554);//将值改成12554
		
		file.close();
		
		FileOutputStream outFile =new FileOutputStream(new File(path));
		workbook.write(outFile);
		outFile.close();
    }

创建一个新的excel

  static void Create(String path)
    {
    	HSSFWorkbook workbook = new HSSFWorkbook();
    	HSSFSheet sheet = workbook.createSheet("伊泽rl");
    	
    	Row row = sheet.createRow(0);
    	
    	Cell cell = row.createCell(0);
    	
    	cell.setCellValue("伊泽rl");
    	
    	try {
    	    FileOutputStream out =new FileOutputStream(new File(path));
    	    workbook.write(out);
    	    out.close();

    	} catch (FileNotFoundException e) {
    	    e.printStackTrace();
    	} catch (IOException e) {
    	    e.printStackTrace();
    	}
    }

添加公式

cell.setCellFormula("A1*B2*C3");

添加背景颜色、单元格样式等操作大家可以查看poi的API

https://poi.apache.org/apidocs/4.0/