Java操作Excel(Apache Poi详解)

1.导入依赖

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.8</version>
        </dependency>

2.Excel表单元格控制

2.1 最基础的行列控制

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();
        //创建工作表(Sheet)
        HSSFSheet sheet = workbook.createSheet("Test");
        // 创建行,从0开始
        HSSFRow row = sheet.createRow(0);
        // 创建行的单元格,也是从0开始
        HSSFCell cell = row.createCell(0);
        // 设置单元格内容
        cell.setCellValue("CsdnerM");
        // 设置单元格内容,重载
        row.createCell(1).setCellValue(false);
        // 设置单元格内容,重载
        row.createCell(2).setCellValue(new Date());
        // 设置单元格内容,重载
        row.createCell(3).setCellValue(12.345);
        
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.2 设置格式

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(0);
//设置日期格式--使用Excel内嵌的格式
        HSSFCell cell = row.createCell(0);
        cell.setCellValue(new Date());
        HSSFCellStyle style = workbook.createCellStyle();
        style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));
        cell.setCellStyle(style);
//设置保留2位小数--使用Excel内嵌的格式
        cell = row.createCell(1);
        cell.setCellValue(12.3456789);
        style = workbook.createCellStyle();
        style.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00"));
        cell.setCellStyle(style);
//设置货币格式--使用自定义的格式
        cell = row.createCell(2);
        cell.setCellValue(12345.6789);
        style = workbook.createCellStyle();
        style.setDataFormat(workbook.createDataFormat().getFormat("￥#,##0"));
        cell.setCellStyle(style);
//设置百分比格式--使用自定义的格式
        cell = row.createCell(3);
        cell.setCellValue(0.123456789);
        style = workbook.createCellStyle();
        style.setDataFormat(workbook.createDataFormat().getFormat("0.00%"));
        cell.setCellStyle(style);
//设置中文大写格式--使用自定义的格式
        cell = row.createCell(4);
        cell.setCellValue(12345);
        style = workbook.createCellStyle();
        style.setDataFormat(workbook.createDataFormat().getFormat("[DbNum2][$-804]0"));
        cell.setCellStyle(style);
//设置科学计数法格式--使用自定义的格式
        cell = row.createCell(5);
        cell.setCellValue(12345);
        style = workbook.createCellStyle();
        style.setDataFormat(workbook.createDataFormat().getFormat("0.00E+00"));
        cell.setCellStyle(style);

        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.3 合并单元格

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row=sheet.createRow(0);
//合并列
        HSSFCell cell=row.createCell(0);
        cell.setCellValue("合并列");
        CellRangeAddress region=new CellRangeAddress(0, 0, 0, 5);
        sheet.addMergedRegion(region);
//合并行
        cell=row.createCell(6);
        cell.setCellValue("合并行");
        region=new CellRangeAddress(0, 5, 7, 7);
        sheet.addMergedRegion(region);
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.4 单元格对齐

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row=sheet.createRow(0);
        HSSFCell cell=row.createCell(0);
        cell.setCellValue("单元格对齐");
        HSSFCellStyle style=workbook.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
        style.setWrapText(true);//自动换行
        style.setIndention((short)5);//缩进
        style.setRotation((short)0);//文本旋转，这里的取值是从-90到90，而不是0-180度。
        cell.setCellStyle(style);
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.5 设置边框

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row=sheet.createRow(0);
        HSSFCell cell=row.createCell(1);
        cell.setCellValue("设置边框");
        HSSFCellStyle style=workbook.createCellStyle();
        style.setBorderTop(HSSFCellStyle.BORDER_DOTTED);//上边框
        style.setBorderBottom(HSSFCellStyle.BORDER_THICK);//下边框
        style.setBorderLeft(HSSFCellStyle.BORDER_DOUBLE);//左边框
        style.setBorderRight(HSSFCellStyle.BORDER_SLANTED_DASH_DOT);//右边框
        style.setTopBorderColor(HSSFColor.RED.index);//上边框颜色
        style.setBottomBorderColor(HSSFColor.BLUE.index);//下边框颜色
        style.setLeftBorderColor(HSSFColor.GREEN.index);//左边框颜色
        style.setRightBorderColor(HSSFColor.PINK.index);//右边框颜色
        cell.setCellStyle(style);
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.6 设置字体

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row=sheet.createRow(0);

        HSSFCell cell = row.createCell(1);
        cell.setCellValue("设置字体");
        HSSFCellStyle style = workbook.createCellStyle();
        HSSFFont font = workbook.createFont();
        font.setFontName("华文行楷");//设置字体名称
        font.setFontHeightInPoints((short)28);//设置字号
        font.setColor(HSSFColor.RED.index);//设置字体颜色
        font.setUnderline(FontFormatting.U_SINGLE);//设置下划线
        font.setTypeOffset(FontFormatting.SS_SUPER);//设置上标下标
        font.setStrikeout(true);//设置删除线
        style.setFont(font);
        cell.setCellStyle(style);

        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.7 设置图案样式

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row=sheet.createRow(0);

        HSSFCell cell = row.createCell(1);
        HSSFCellStyle style = workbook.createCellStyle();
        style.setFillForegroundColor(HSSFColor.GREEN.index);//设置图案颜色
        style.setFillBackgroundColor(HSSFColor.RED.index);//设置图案背景色
        style.setFillPattern(HSSFCellStyle.SQUARES);//设置图案样式
        cell.setCellStyle(style);

        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

2.8 设置宽度和高度

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(1);
        HSSFCell cell = row.createCell(1);
        cell.setCellValue("123456789012345678901234567890");
        sheet.setColumnWidth(1, 31 * 256);//设置第一列的宽度是31个字符宽度
        row.setHeightInPoints(50);//设置行的高度是50个点
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

3.使用Excel公式

3.1 基本计算

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(0);
        HSSFCell cell = row.createCell(0);
        cell.setCellFormula("2+3*4");//设置公式
        cell = row.createCell(1);
        cell.setCellValue(10);
        cell = row.createCell(2);
        cell.setCellFormula("A1*B1");//设置公式
        
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

3.2 sum行数

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(0);
        row.createCell(0).setCellValue(1);
        row.createCell(1).setCellValue(2);
        row.createCell(2).setCellValue(3);
        row.createCell(3).setCellValue(4);
        row.createCell(4).setCellValue(5);
        row = sheet.createRow(1);
        row.createCell(0).setCellFormula("sum(A1,C1)");//等价于"A1+C1"
        row.createCell(1).setCellFormula("sum(B1:D1)");//等价于"B1+C1+D1"

        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

3.3 日期函数

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFCellStyle style=workbook.createCellStyle();
        style.setDataFormat(workbook.createDataFormat().getFormat("yyyy-mm-dd"));
        HSSFRow row = sheet.createRow(0);
        Calendar date=Calendar.getInstance();//日历对象
        HSSFCell cell=row.createCell(0);
        date.set(2011,2, 7);
        cell.setCellValue(date.getTime());
        cell.setCellStyle(style);//第一个单元格开始时间设置完成
        cell=row.createCell(1);
        date.set(2014,4, 25);
        cell.setCellValue(date.getTime());
        cell.setCellStyle(style);//第一个单元格结束时间设置完成
        cell=row.createCell(3);
        cell.setCellFormula("CONCATENATE(DATEDIF(A1,B1,\"y\"),\"年\")");
        cell=row.createCell(4);
        cell.setCellFormula("CONCATENATE(DATEDIF(A1,B1,\"m\"),\"月\")");
        cell=row.createCell(5);
        cell.setCellFormula("CONCATENATE(DATEDIF(A1,B1,\"d\"),\"日\")");


        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

3.4 字符串函数

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(0);
        row.createCell(0).setCellValue("abcdefg");
        row.createCell(1).setCellValue("aa bb cc dd ee fF GG");
        row.createCell(3).setCellFormula("UPPER(A1)");
        row.createCell(4).setCellFormula("PROPER(B1)");


        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

3.5 获取返回值

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(0);
        row.createCell(0).setCellValue(7);//A1
        row.createCell(1).setCellValue(8);//B1
        HSSFCell cell=row.createCell(2);
        cell.setCellFormula("A1*B1+14");
        HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(workbook);
        cell = e.evaluateInCell(cell);//若Excel文件不是POI创建的，则不必调用此方法
        System.out.println("公式计算结果："+cell.getNumericCellValue());


        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

4.使用图形

4.1 画线

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFPatriarch patriarch=sheet.createDrawingPatriarch();
        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0,(short)1, 0,(short)4, 4);
        HSSFSimpleShape line = patriarch.createSimpleShape(anchor);
        line.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);//设置图形类型
        line.setLineStyle(HSSFShape.LINESTYLE_SOLID);//设置图形样式
        line.setLineWidth(6350);//在POI中线的宽度12700表示1pt,所以这里是0.5pt粗的线条。


        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

4.2 画矩形

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFPatriarch patriarch=sheet.createDrawingPatriarch();
        HSSFClientAnchor anchor = new HSSFClientAnchor(255,122,255, 122, (short)1, 0,(short)4, 3);
        HSSFSimpleShape rec = patriarch.createSimpleShape(anchor);
        rec.setShapeType(HSSFSimpleShape.OBJECT_TYPE_RECTANGLE);
        rec.setLineStyle(HSSFShape.LINESTYLE_DASHGEL);//设置边框样式
        rec.setFillColor(255, 0, 0);//设置填充色
        rec.setLineWidth(25400);//设置边框宽度
        rec.setLineStyleColor(0, 0, 255);//设置边框颜色

        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

4.3 画圆形

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();


        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFPatriarch patriarch=sheet.createDrawingPatriarch();
        HSSFClientAnchor anchor = new HSSFClientAnchor(255,122,255, 122, (short)1, 0,(short)4, 3);
        HSSFSimpleShape rec = patriarch.createSimpleShape(anchor);
        rec.setShapeType(HSSFSimpleShape.OBJECT_TYPE_OVAL);//设置图片类型
        rec.setLineStyle(HSSFShape.LINESTYLE_DASHGEL);//设置边框样式
        rec.setFillColor(255, 0, 0);//设置填充色
        rec.setLineWidth(25400);//设置边框宽度
        rec.setLineStyleColor(0, 0, 255);//设置边框颜色

        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

4.4 画网格

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        HSSFRow row = sheet.createRow(2);
        row.createCell(1);
        row.setHeightInPoints(240);
        sheet.setColumnWidth(2, 9000);
        int linesCount = 20;
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
//因为HSSFClientAnchor中dx只能在0-1023之间,dy只能在0-255之间，这里采用比例的方式
        double xRatio = 1023.0 / (linesCount * 10);
        double yRatio = 255.0 / (linesCount * 10);
// 画竖线
        int x1 = 0;
        int y1 = 0;
        int x2 = 0;
        int y2 = 200;
        for (int i = 0; i < linesCount; i++) {
    
    
            HSSFClientAnchor a2 = new HSSFClientAnchor();
            a2.setAnchor((short) 2, 2, (int) (x1 * xRatio),
                    (int) (y1 * yRatio), (short) 2, 2, (int) (x2 * xRatio),
                    (int) (y2 * yRatio));
            HSSFSimpleShape shape2 = patriarch.createSimpleShape(a2);
            shape2.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
            x1 += 10;
            x2 += 10;
        }
// 画横线
        x1 = 0;
        y1 = 0;
        x2 = 200;
        y2 = 0;
        for (int i = 0; i < linesCount; i++) {
    
    
            HSSFClientAnchor a2 = new HSSFClientAnchor();
            a2.setAnchor((short) 2, 2, (int) (x1 * xRatio),
                    (int) (y1 * yRatio), (short) 2, 2, (int) (x2 * xRatio),
                    (int) (y2 * yRatio));
            HSSFSimpleShape shape2 = patriarch.createSimpleShape(a2);
            shape2.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
            y1 += 10;
            y2 += 10;
        }
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

4.5 插入图片

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        //创建Excel文件(Workbook)
        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet("Test");// 创建工作表(Sheet)
        FileInputStream stream = new FileInputStream("C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\11.jpg");
        byte[] bytes = new byte[(int) stream.getChannel().size()];
        stream.read(bytes);//读取图片到二进制数组
        int pictureIdx = workbook.addPicture(bytes, HSSFWorkbook.PICTURE_TYPE_JPEG);
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, (short) 0, 0, (short) 5, 5);
        HSSFPicture pict = patriarch.createPicture(anchor, pictureIdx);
        pict.resize();//自动调节图片大小,图片位置信息可能丢失
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

5.Excel行列操作

5.1 锁定列

public class Test00 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //文件路径
        String filePath = "C:\\Users\\masiyi\\IdeaProjects\\demo\\src\\main\\resources\\test.xls";
        HSSFWorkbook workbook = new HSSFWorkbook();// 创建Excel文件(Workbook)
        HSSFSheet sheet= workbook.createSheet("Test0");// 创建工作表(Sheet)
        sheet.createFreezePane(2, 3, 15, 25);//冻结行列
        FileOutputStream out = new FileOutputStream(filePath);
        //保存Excel文件
        workbook.write(out);

        out.close();//关闭文件流
        System.out.println("OK!");
    }
}

参考：Apache POI使用详解