雷林鹏分享:Apache POI单元格/Cells

  输入到电子表格中的任何数据总是存储在一个单元中。我们使用的行和列的标签来识别单元格。本章介绍了如何使用Java编程操纵单元电子表格的数据。

  创建一个单元格

  需要创建一个单元之前创建一个行。行是什么?只不过是单元的集合。

  下面的代码片段用于创建一个单元格。

  //create new workbook

  XSSFWorkbook workbook = new XSSFWorkbook();

  //create spreadsheet with a name

  XSSFSheet spreadsheet = workbook.createSheet("new sheet");

  //create first row on a created spreadsheet

  XSSFRow row = spreadsheet.createRow(0);

  //create first cell on created row

  XSSFCell cell = row.createCell(0);

  单元格类型

  单元格类型指定单元格是否可以包含字符串,数值,或公式。字符串单元不能持有数值和数值单元格无法容纳字符串。下面给出是单元格值和类型的语法。

  单元格的值类型类型语法

  Blank cell valueXSSFCell.CELL_TYPE_BLANK

  Boolean cell valueXSSFCell.CELL.TYPE_BOOLEAN

  Error cell valueXSSFCell.CELL_TYPE_ERROR

  Numeric cell valueXSSFCell.CELL_TYPE_NUMERIC

  String cell valueXSSFCell.CELL_TYPE_STRING

  以下代码是用于在电子表格创建不同类型的单元格。

  import java.io.File;

  import java.io.FileOutputStream;

  import java.util.Date;

  import org.apache.poi.xssf.usermodel.XSSFCell;

  import org.apache.poi.xssf.usermodel.XSSFRow;

  import org.apache.poi.xssf.usermodel.XSSFSheet;

  import org.apache.poi.xssf.usermodel.XSSFWorkbook;

  public class TypesofCells

  {

  public static void main(String[] args)throws Exception

  {

  XSSFWorkbook workbook = new XSSFWorkbook();

  XSSFSheet spreadsheet = workbook.createSheet("cell types");

  XSSFRow row = spreadsheet.createRow((short) 2);

  row.createCell(0).setCellValue("Type of Cell");

  row.createCell(1).setCellValue("cell value");

  row = spreadsheet.createRow((short) 3);

  row.createCell(0).setCellValue("set cell type BLANK");

  row.createCell(1);

  row = spreadsheet.createRow((short) 4);

  row.createCell(0).setCellValue("set cell type BOOLEAN");

  row.createCell(1).setCellValue(true);

  row = spreadsheet.createRow((short) 5);

  row.createCell(0).setCellValue("set cell type ERROR");

  row.createCell(1).setCellValue(XSSFCell.CELL_TYPE_ERROR );

  row = spreadsheet.createRow((short) 6);

  row.createCell(0).setCellValue("set cell type date");

  row.createCell(1).setCellValue(new Date());

  row = spreadsheet.createRow((short) 7);

  row.createCell(0).setCellValue("set cell type numeric" );

  row.createCell(1).setCellValue(20 );

  row = spreadsheet.createRow((short) 8);

  row.createCell(0).setCellValue("set cell type string");

  row.createCell(1).setCellValue("A String");

  FileOutputStream out = new FileOutputStream(

  new File("typesofcells.xlsx"));

  workbook.write(out);

  out.close();

  System.out.println(

  "typesofcells.xlsx written successfully");

  }

  }

  保存上面的代码到一个名为TypesofCells.java文件,编译并从命令提示符如下执行它。

  $javac TypesofCells.java

  $java TypesofCells

  如果您的系统配置了POI库,那么它会编译和执行在当前目录中生成一个名为typesofcells.xlsx的Excel文件,并显示以下输出。

  typesofcells.xlsx written successfully

  typesofcells.xlsx文件如下所示。

雷林鹏分享:Apache POI单元格/Cells

  单元格样式

  在这里,可以学习如何做单元格格式,并采用不同的风格,如合并相邻的单元格,添加边框,设置单元格对齐方式和填充颜色。

  以下代码是使用Java编程用于不同样式应用到单元格。

  import java.io.File;

  import java.io.FileOutputStream;

  import org.apache.poi.hssf.util.HSSFColor;

  import org.apache.poi.ss.usermodel.IndexedColors;

  import org.apache.poi.ss.util.CellRangeAddress;

  import org.apache.poi.xssf.usermodel.XSSFCell;

  import org.apache.poi.xssf.usermodel.XSSFCellStyle;

  import org.apache.poi.xssf.usermodel.XSSFRow;

  import org.apache.poi.xssf.usermodel.XSSFSheet;

  import org.apache.poi.xssf.usermodel.XSSFWorkbook;

  public class CellStyle

  {

  public static void main(String[] args)throws Exception

  {

  XSSFWorkbook workbook = new XSSFWorkbook();

  XSSFSheet spreadsheet = workbook.createSheet("cellstyle");

  XSSFRow row = spreadsheet.createRow((short) 1);

  row.setHeight((short) 800);

  XSSFCell cell = (XSSFCell) row.createCell((short) 1);

  cell.setCellValue("test of merging");

  //MEARGING CELLS

  //this statement for merging cells

  spreadsheet.addMergedRegion(new CellRangeAddress(

  1, //first row (0-based)

  1, //last row (0-based)

  1, //first column (0-based)

  4 //last column (0-based)

  ));

  //CELL Alignment

  row = spreadsheet.createRow(5);

  cell = (XSSFCell) row.createCell(0);

  row.setHeight((short) 800);

  // Top Left alignment

  XSSFCellStyle style1 = workbook.createCellStyle();

  spreadsheet.setColumnWidth(0, 8000);

  style1.setAlignment(XSSFCellStyle.ALIGN_LEFT);

  style1.setVerticalAlignment(XSSFCellStyle.VERTICAL_TOP);

  cell.setCellValue("Top Left");

  cell.setCellStyle(style1);

  row = spreadsheet.createRow(6);

  cell = (XSSFCell) row.createCell(1);

  row.setHeight((short) 800);

  // Center Align Cell Contents

  XSSFCellStyle style2 = workbook.createCellStyle();

  style2.setAlignment(XSSFCellStyle.ALIGN_CENTER);

  style2.setVerticalAlignment(

  XSSFCellStyle.VERTICAL_CENTER);

  cell.setCellValue("Center Aligned");

  cell.setCellStyle(style2);

  row = spreadsheet.createRow(7);

  cell = (XSSFCell) row.createCell(2);

  row.setHeight((short) 800);

  // Bottom Right alignment

  XSSFCellStyle style3 = workbook.createCellStyle();

  style3.setAlignment(XSSFCellStyle.ALIGN_RIGHT);

  style3.setVerticalAlignment(

  XSSFCellStyle.VERTICAL_BOTTOM);

  cell.setCellValue("Bottom Right");

  cell.setCellStyle(style3);

  row = spreadsheet.createRow(8);

  cell = (XSSFCell) row.createCell(3);

  // Justified Alignment

  XSSFCellStyle style4 = workbook.createCellStyle();

  style4.setAlignment(XSSFCellStyle.ALIGN_JUSTIFY);

  style4.setVerticalAlignment(

  XSSFCellStyle.VERTICAL_JUSTIFY);

  cell.setCellValue("Contents are Justified in Alignment");

  cell.setCellStyle(style4);

  //CELL BORDER

  row = spreadsheet.createRow((short) 10);

  row.setHeight((short) 800);

  cell = (XSSFCell) row.createCell((short) 1);

  cell.setCellValue("BORDER");

  XSSFCellStyle style5 = workbook.createCellStyle();

  style5.setBorderBottom(XSSFCellStyle.BORDER_THICK);

  style5.setBottomBorderColor(

  IndexedColors.BLUE.getIndex());

  style5.setBorderLeft(XSSFCellStyle.BORDER_DOUBLE);

  style5.setLeftBorderColor(

  IndexedColors.GREEN.getIndex());

  style5.setBorderRight(XSSFCellStyle.BORDER_HAIR);

  style5.setRightBorderColor(

  IndexedColors.RED.getIndex());

  style5.setBorderTop(XSSFCellStyle.BIG_SPOTS);

  style5.setTopBorderColor(

  IndexedColors.CORAL.getIndex());

  cell.setCellStyle(style5);

  //Fill Colors

  //background color

  row = spreadsheet.createRow((short) 10 );

  cell = (XSSFCell) row.createCell((short) 1);

  XSSFCellStyle style6 = workbook.createCellStyle();

  style6.setFillBackgroundColor(

  HSSFColor.LEMON_CHIFFON.index );

  style6.setFillPattern(XSSFCellStyle.LESS_DOTS);

  style6.setAlignment(XSSFCellStyle.ALIGN_FILL);

  spreadsheet.setColumnWidth(1,8000);

  cell.setCellValue("FILL BACKGROUNG/FILL PATTERN");

  cell.setCellStyle(style6);

  //Foreground color

  row = spreadsheet.createRow((short) 12);

  cell = (XSSFCell) row.createCell((short) 1);

  XSSFCellStyle style7=workbook.createCellStyle();

  style7.setFillForegroundColor(HSSFColor.BLUE.index);

  style7.setFillPattern( XSSFCellStyle.LESS_DOTS);

  style7.setAlignment(XSSFCellStyle.ALIGN_FILL);

  cell.setCellValue("FILL FOREGROUND/FILL PATTERN");

  cell.setCellStyle(style7);

  FileOutputStream out = new FileOutputStream(

  new File("cellstyle.xlsx"));

  workbook.write(out);

  out.close();

  System.out.println("cellstyle.xlsx written successfully");

  }

  }

  保存上面的代码在一个名为CellStyle.java文件,编译并从命令提示符如下执行它。

  $javac CellStyle.java

  $java CellStyle

  它会生成一个名为cellstyle.xlsx在当前目录中的Excel文件并显示以下输出。

  cellstyle.xlsx written successfully

  cellstyle.xlsx文件如下所示。

雷林鹏分享:Apache POI单元格/Cells

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雷林鹏分享:Apache POI单元格/Cells

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