POI Excel 学习

引入依赖

    org.apache.poi
    poi
    3.9

工作簿(Workbook)表示使用HSSF Workbook类创建的Excel文件

1、创建工作簿

package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
public class CreateWorkBook {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		Workbook wb = new HSSFWorkbook();
	    try(OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
	        wb.write(fileOut);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

2、创建工作表

package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class NewSheet {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		Workbook wb = new HSSFWorkbook();
	    try  (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
	        Sheet sheet1 = wb.createSheet("First Sheet");
	        Sheet sheet2 = wb.createSheet("Second Sheet");
	        wb.write(fileOut);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

3、创建单元格（实际上是定位到单元格）

package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class NewCellExample {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		Workbook wb = new HSSFWorkbook();
	    try  (OutputStream os = new FileOutputStream("Learnfk.xls")) {
	        Sheet sheet = wb.createSheet("New Sheet");
	        Row row     = sheet.createRow(2);
	        Cell cell   = row.createCell(5);
	        cell.setCellValue("Javatpoint");
	        wb.write(os);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

4、日期单元格

package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class DateCellExample {
	
	public static void main(String[] args) throws FileNotFoundException, IOException {
		Workbook wb = new HSSFWorkbook();
		CreationHelper createHelper = wb.getCreationHelper();
	    try(OutputStream os = new FileOutputStream("Learnfk.xls")){
	        Sheet sheet = wb.createSheet("New Sheet");
	        Row row     = sheet.createRow(0);
	        Cell cell   = row.createCell(0);
	        CellStyle cellStyle = wb.createCellStyle();
	        cellStyle.setDataFormat(
	            createHelper.createDataFormat().getFormat("d/m/yy h:mm"));
	        cell = row.createCell(1);
	        cell.setCellValue(new Date());
	        cell.setCellStyle(cellStyle);
	        wb.write(os);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

5、单元格对齐、高度和宽度

复制代码
package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;

public class AlignExample {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		Workbook wb = new HSSFWorkbook();
	    try  (OutputStream os = new FileOutputStream("Learnfk.xls")) {
	        Sheet sheet = wb.createSheet("New Sheet");
	        Row row = sheet.createRow(0);
	        Cell cell = row.createCell(0);
	        cell.setCellValue("Javatpoint");
	        CellStyle cellStyle = wb.createCellStyle();
	        row = sheet.createRow(5); 
	        cell = row.createCell(0);
	       //左上对齐
	        HSSFCellStyle style1 = (HSSFCellStyle) wb.createCellStyle();
	        sheet.setColumnWidth(0, 8000);
	        cell.setCellValue("Top Left");
	        cell.setCellStyle(style1);
	        row = sheet.createRow(6); 
	        cell = row.createCell(1);
	        row.setHeight((short) 800);
	        wb.write(os);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}

}

6、单元格边框样式

复制代码
package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class BorderExample {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		    Workbook wb = new HSSFWorkbook();
		    Sheet sheet = wb.createSheet("Sheet");
		    Row row     = sheet.createRow(1);
		    Cell cell   = row.createCell(1);
		    cell.setCellValue(101);
		   //单元格的样式边框。
		    CellStyle style = wb.createCellStyle();
		    style.setBorderBottom(BorderStyle.THIN);
		    style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		    style.setBorderRight(BorderStyle.THIN);
		    style.setRightBorderColor(IndexedColors.BLUE.getIndex());
		    style.setBorderTop(BorderStyle.MEDIUM_DASHED);
		    style.setTopBorderColor(IndexedColors.BLACK.getIndex());
		    cell.setCellStyle(style);
		    try (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
		        wb.write(fileOut);
		    }catch(Exception e) {
		    	System.out.println(e.getMessage());
		    }
	}
}

7、单元格颜色

package poiexample;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ColorExample {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		try (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
		    Workbook wb = new XSSFWorkbook();
		    Sheet sheet = wb.createSheet("Sheet");
		    Row row = sheet.createRow(1);
		    CellStyle style = wb.createCellStyle();
		   //设置背景颜色
		    style.setFillBackgroundColor(IndexedColors.GREEN.getIndex());
		    style.setFillPattern(FillPatternType.BIG_SPOTS);
		    Cell cell = row.createCell(1);
		    cell.setCellValue("Javatpoint");
		    cell.setCellStyle(style);
		   //设置前景色
		    style = wb.createCellStyle();
		    style.setFillForegroundColor(IndexedColors.BLUE.getIndex());
		    style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
		    cell = row.createCell(2);
		    cell.setCellValue("A Technical Portal");
		    cell.setCellStyle(style);
                    wb.write(fileOut);
                 }catch(Exception e) {
		    	System.out.println(e.getMessage());
		}
	}
}

8、合并单元格

package poiexample;
import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
public class MergingCellExample {
	public static void main(String[] args) {
	    try (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
		    Workbook wb = new HSSFWorkbook();
		    Sheet sheet = wb.createSheet("Sheet");	
		    Row row = sheet.createRow(1);
		    Cell cell = row.createCell(1);
		    cell.setCellValue("Two cells have merged");
	          //通过提供单元格索引来合并单元格
		    sheet.addMergedRegion(new CellRangeAddress(1,1,1,2));
		    wb.write(fileOut);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

9、单元格属性

POI Excel 属性单元格 - Apache Excel 入门教程 - 无涯教程网

10、单元格类型（数据类型）

复制代码
package poiexample;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Calendar;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class CellTypeExample {
	public static void main(String[] args) {
		try (OutputStream os = new FileOutputStream("Learnfk.xls")) {
		Workbook wb = new HSSFWorkbook();
	    Sheet sheet = wb.createSheet("Sheet");
	    Row row = sheet.createRow(2);                          
	    row.createCell(0).setCellValue(1.1);//浮点值
	    row.createCell(1).setCellValue(" "+new Date());//日期类型
	    row.createCell(2).setCellValue(" "+Calendar.getInstance());// Calendar
	    row.createCell(3).setCellValue("a string value");//字符串
	    row.createCell(4).setCellValue(true);//布尔类型
	    row.createCell(5).setCellType(CellType.ERROR);//错误
	    wb.write(os);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

11、单元格换行（写入多行数据）

package poiexample;
import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class NewlineExample {
	public static void main(String[] args) {
		try (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
			Workbook wb = new HSSFWorkbook();
			Sheet sheet = wb.createSheet("Sheet");
			Row row     = sheet.createRow(1);
			Cell cell   = row.createCell(1);
			cell.setCellValue("This is first line and \n this is second line");
			CellStyle cs = wb.createCellStyle();
			cs.setWrapText(true);
			cell.setCellStyle(cs);
			row.setHeightInPoints((2*sheet.getDefaultRowHeightInPoints()));
			sheet.autoSizeColumn(2);
	        wb.write(fileOut);
	    }catch(Exception e) {
	    	System.out.println(e.getMessage());
	    }
	}
}

12、读取单元格

package poiexample;
import java.io.FileInputStream;
import java.io.InputStream;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
public class GettingCellContentExample {
	public static void main(String[] args) {
		try (InputStream inp = new FileInputStream("Learnfk.xls")) {
		        Workbook wb = WorkbookFactory.create(inp);
		        Sheet sheet = wb.getSheetAt(0);
		        Row row = sheet.getRow(2);
		        Cell cell = row.getCell(3);
		        if (cell != null)
		        	System.out.println("Data: "+cell);
		        else
		            System.out.println("Cell is empty");
	    }catch(Exception e) {
	    	System.out.println(e);
	    }
	}
}

13、字体

复制代码
package poiexample;
import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class FontExample {
	public static void main(String[] args) {
		try (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
			Workbook wb = new HSSFWorkbook();//创建工作簿
			Sheet sheet = wb.createSheet("Sheet");//创建工作表
			Row row = sheet.createRow(1);//创建行
			Cell cell = row.createCell(1);//创建一个单元格
			CellStyle style = wb.createCellStyle();//创建样式
			cell.setCellValue("Hello, Javatpoint!");
			// 创建字体和设置
			Font font = wb.createFont();
			font.setFontHeightInPoints((short)11);
			font.setFontName("Courier New");
			font.setItalic(true);
			font.setStrikeout(true);
			// 将字体应用于样式
			style.setFont(font);
			// 将样式应用于单元格
			cell.setCellStyle(style);    
	                wb.write(fileOut);
	       }catch(Exception e) {
	        	System.out.println(e.getMessage());
	       }
	}
}

14、设置标题

复制代码
package poiexample;
import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Header;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class HeaderExample {
	public static void main(String[] args) {
		try (OutputStream fileOut = new FileOutputStream("Learnfk.xls")) {
			Workbook wb = new HSSFWorkbook();
			Sheet sheet = wb.createSheet("Sheet");
			//创建标题
			Header header = sheet.getHeader();
			header.setCenter("Center Header");
			header.setLeft  ("Left Header");
			header.setRight ("Right align Header");
			// 创建行
			Row row = sheet.createRow(4);//Creating a row
			Cell cell = row.createCell(1);//Creating a cell
			cell.setCellValue("Hello, Javaipoint!");
	                wb.write(fileOut);
	      }catch(Exception e) {
	    	System.out.println(e.getMessage());
	      }
	}
}

15、隐藏行

import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class HideExample {
	public static void main(String[] args) {
		try (OutputStream os = new FileOutputStream("Learnfk.xls")) {
			Workbook workbook = new HSSFWorkbook();
		    Sheet sheet = workbook.createSheet();
		    Row row = sheet.createRow(0);
		    Cell cell = row.createCell(0);
		    cell.setCellValue("102");
		    row.setZeroHeight(false);
		    workbook.write(os);
		}catch(Exception e) {
			System.out.println(e.getMessage());
		}
	}
}

16、绘图边框

import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.BorderExtent;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.PropertyTemplate;
public class DrawingBorderExample {
	public static void main(String[] args) {		
		try (OutputStream os = new FileOutputStream("Learnfk.xls")) {	
			 PropertyTemplate pt = new PropertyTemplate();
			 pt.drawBorders(new CellRangeAddress(1, 2, 1, 2),
			          BorderStyle.MEDIUM, BorderExtent.ALL);
			 pt.drawBorders(new CellRangeAddress(5, 6, 1, 2),
			          BorderStyle.MEDIUM, BorderExtent.OUTSIDE);
			 pt.drawBorders(new CellRangeAddress(5, 6, 1, 2), BorderStyle.THIN,
			          BorderExtent.INSIDE);
			 pt.drawBorders(new CellRangeAddress(9, 10, 1, 3),
			          BorderStyle.MEDIUM, IndexedColors.GREEN.getIndex(),
			          BorderExtent.OUTSIDE);
			 pt.drawBorders(new CellRangeAddress(9, 10, 1, 3),
			          BorderStyle.MEDIUM, IndexedColors.BLUE.getIndex(),
			          BorderExtent.INSIDE_VERTICAL);
			 pt.drawBorders(new CellRangeAddress(9, 10, 1, 3),
			          BorderStyle.MEDIUM, IndexedColors.RED.getIndex(),
			          BorderExtent.INSIDE_HORIZONTAL);
			 pt.drawBorders(new CellRangeAddress(10, 10, 2, 2),
			          BorderStyle.NONE, 
			          BorderExtent.ALL);
			 Workbook wb = new HSSFWorkbook();
			 Sheet sheet = wb.createSheet("Sheet");
			 pt.applyBorders(sheet);
			 wb.write(os);
		}catch(Exception e) {
			System.out.println(e.getMessage());
		}
	}
}

17、插入图片

import java.io.FileOutputStream;
import java.io.OutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
public class OutlineExample {
	public static void main(String[] args) {
		 try (OutputStream os = new FileOutputStream("Learnfk.xls")) {
			 Workbook wb = new HSSFWorkbook();
			 Sheet sheet = wb.createSheet("Sheet");
			 sheet.groupRow( 4, 10 );
			 sheet.groupColumn( 2, 8 );
		     wb.write(os);
		 }catch(Exception e) {
			 System.out.println(e.getMessage());
		 }
	}
}