java POI创建Excel示例（xslx和xsl区别 ）

Java用来处理office类库有很多，其中POI就是比较出名的一个，它是apache的类库，现在版本到了3.10，也就是2014年2月8号这个版本。

在处理PPT，Excel和Word前，需要导入以前几个jar包：

dom4j-1.7-20060614.jar

log4j-1.2.13.jar

poi-3.7-20101029.jar

poi-ooxml-3.7-20101029.jar

poi-ooxml-schemas-3.7-20101029.jar

本文主要简介下java poi处理Excel，

2003版本的.xls一张sheet表允许存2^16 ＝ 次方行数据，2^8 = 256列数据，

2007版本以上的.xlsx一张sheet表允许存的数据就更大了，是百万级别的。行： 2^20 = 1048576; 列：2^14 = 16384 行。

以下代码简单操作了excel文件。 

 1 package com.caoyuanzhanlang.excelhandle; 2  3 import java.io.File; 4 import java.io.FileOutputStream; 5  6 import org.apache.poi.hssf.util.HSSFColor; 7 import org.apache.poi.ss.usermodel.Cell; 8 import org.apache.poi.ss.usermodel.CellStyle; 9 import org.apache.poi.ss.usermodel.Font;10 import org.apache.poi.ss.usermodel.Row;11 import org.apache.poi.ss.usermodel.Sheet;12 import org.apache.poi.ss.usermodel.Workbook;13 import org.apache.poi.xssf.usermodel.XSSFWorkbook;14 15 public class NewExcel {16     17     private String excelPath = "data.xlsx";18 19     public static void main(String[] args) throws Exception{20         NewExcel excel = new NewExcel();21         if(excel.createExcelFile()) {22             System.out.println("data.xlsx is created successfully.");23         }24     }25     public boolean createExcelFile() {26         boolean isCreateSuccess = false;27         Workbook workbook = null;28         try {29             // XSSFWork used for .xslx (>= 2007), HSSWorkbook for 03 .xsl30             workbook = new XSSFWorkbook();//HSSFWorkbook();//WorkbookFactory.create(inputStream);31         }catch(Exception e) {32             System.out.println("It cause Error on CREATING excel workbook: ");33             e.printStackTrace();34         }35         if(workbook != null) {36             Sheet sheet = workbook.createSheet("testdata");37             Row row0 = sheet.createRow(0);38             for(int i = 0; i < 11; i++) {39                 Cell cell_1 = row0.createCell(i, Cell.CELL_TYPE_STRING);40                 CellStyle style = getStyle(workbook);41                 cell_1.setCellStyle(style);42                 cell_1.setCellValue("HELLO" + i + "Column");43                 sheet.autoSizeColumn(i);44             }45             for (int rowNum = 1; rowNum < 200; rowNum++) {46                 Row row = sheet.createRow(rowNum);47                 for(int i = 0; i < 11; i++) {48                     Cell cell = row.createCell(i, Cell.CELL_TYPE_STRING);49                     cell.setCellValue("cell" + String.valueOf(rowNum+1) + String.valueOf(i+1));50                 }51             }52             try {53                 FileOutputStream outputStream = new FileOutputStream(excelPath);54                 workbook.write(outputStream);55                 outputStream.flush();56                 outputStream.close();57                 isCreateSuccess = true;58             } catch (Exception e) {59                 System.out.println("It cause Error on WRITTING excel workbook: ");60                 e.printStackTrace();61             }62         }63         File sss = new File(excelPath);64         System.out.println(sss.getAbsolutePath());65         return isCreateSuccess;66     }67     private CellStyle getStyle(Workbook workbook){68         CellStyle style = workbook.createCellStyle();69         style.setAlignment(CellStyle.ALIGN_CENTER); 70         style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);71         // 设置单元格字体72         Font headerFont = workbook.createFont(); // 字体73         headerFont.setFontHeightInPoints((short)14);74         headerFont.setColor(HSSFColor.RED.index);75         headerFont.setFontName("宋体");76         style.setFont(headerFont);77         style.setWrapText(true);78 79         // 设置单元格边框及颜色80         style.setBorderBottom((short)1);81         style.setBorderLeft((short)1);82         style.setBorderRight((short)1);83         style.setBorderTop((short)1);84         style.setWrapText(true);85         return style;86     }87     public String getExcelPath() {88         return this.excelPath;89     }90     91     public void setExcelPath(String excelPath) {92         this.excelPath = excelPath;93     }94 }