java用org.apache.poi包操作excel

最新推荐文章于 2023-12-04 17:30:26 发布

转载最新推荐文章于 2023-12-04 17:30:26 发布 · 90 阅读

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原文链接：http://www.cnblogs.com/gtaxmjld/p/4185711.html

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#java

本文介绍了使用 Jakarta POI 库进行 Excel 文件创建、读取及单元格格式设置的方法。通过示例代码展示了如何创建 Excel 文件、进行简单的写操作（如设置不同类型的单元格值）、读取 Excel 文件内容以及如何设置单元格格式。

1.Jakarta POI 是apache的子项目，目标是处理ol2对象。它提供了一组Windows文档操作的Java API。

2.EXCEL 结构
HSSFWorkbook excell 文档对象介绍
HSSFSheet excell的表单
HSSFRow excell的行
HSSFCell excell的格子单元
HSSFFont excell字体
HSSFName 名称
HSSFDataFormat 日期格式
在poi1.7中才有以下2项：
HSSFHeader sheet头
HSSFFooter sheet尾
和这个样式
HSSFCellStyle cell样式
辅助操作包括
HSSFDateUtil 日期
HSSFPrintSetup 打印
HSSFErrorConstants 错误信息表

3.简单的用法

创建Excel

Java代码

import java.io.FileOutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class NewWorkbook {
public static String outputFile = "C:/test1.xls";
public static void main(String[] args) {
try {
HSSFWorkbook wb = new HSSFWorkbook();//create new HSSFWorkbook object
FileOutputStream fileOut = new FileOutputStream(outputFile);
wb.write(fileOut);//Workbook-->test1.xls
fileOut.flush();
fileOut.close();
System.out.println("The file has been created.");
} catch (Exception e) {
e.printStackTrace();
}
}
}

简单的Excel写操作

Java代码

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class CreateCells {
public static String fileTobewrite = "C:/test1.xls";
public static void main(String[] args) throws IOException {
try {
HSSFWorkbook wb = new HSSFWorkbook();//create new HSSFWorkbook object
HSSFSheet sheet = wb.createSheet("new sheet");// create new sheet object
//Create a row and put some cells in it. Rows are 0.
HSSFRow row = sheet.createRow(0);//create new row
//Create a cell and put a value in it.
HSSFCell cell = row.createCell(0);//create new cell
cell.setCellValue(1);//setting the cell value
//do it on one line
row.createCell(1).setCellValue(1.2);
row.createCell(2).setCellValue("test");
row.createCell(3).setCellValue(true);
HSSFCellStyle cellStyle = wb.createCellStyle();//new cell style
cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));// set date style
HSSFCell dcell = row.createCell(4);//create new cell
dcell.setCellValue(new Date());
dcell.setCellStyle(cellStyle);
HSSFCell csCell = row.createCell(5);
csCell.setCellType(HSSFCell.ENCODING_UTF_16);
csCell.setCellValue("中文测试_Chinese Words Test");//set cell code
row.createCell(6).setCellType(HSSFCell.CELL_TYPE_ERROR);
//write the output to a file
FileOutputStream fileOut = new FileOutputStream(fileTobewrite);
wb.write(fileOut);
fileOut.flush();
fileOut.close();
System.out.println("The cells have been added.");
} catch (Exception e) {
e.printStackTrace();
}
}
}

简单的Excel读操作

Java代码

import java.io.FileInputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class ReadExcel {
public static String fileTobeRead = "C:/test1.xls";
public static String getCellValue(HSSFCell cell){
String value = null;
if (cell != null)
{
//get the type of the cell
int cellType = cell.getCellType();
switch (cellType)
{
//""
case HSSFCell.CELL_TYPE_BLANK :
value = "";
break;
//Boolean
case HSSFCell.CELL_TYPE_BOOLEAN :
value = cell.getBooleanCellValue() ? "TRUE" : "FALSE";
break;
//Error
case HSSFCell.CELL_TYPE_ERROR :
value = "ERR-" + cell.getErrorCellValue();
break;
//Formula
case HSSFCell.CELL_TYPE_FORMULA :
value = cell.getCellFormula();
break;
//Numeric
case HSSFCell.CELL_TYPE_NUMERIC :
//Date
if (HSSFDateUtil.isCellDateFormatted(cell))
{
//change to "yyyy-MM-dd"
DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
value = sdf.format(cell.getDateCellValue());
}
//Number
else
{
value = cell.getNumericCellValue() + "";
}
break;
//String
case HSSFCell.CELL_TYPE_STRING :
value = cell.getStringCellValue();
break;
//Other
default :
value = "Unknown Cell Type:" + cell.getCellType();
}
}
return value;
}
public static void main(String[] args) {
try {
HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(fileTobeRead));
HSSFSheet sheet = wb.getSheet("new sheet");
//getSheetAt(int index) first sheet index is 0.
int rowNum = sheet.getPhysicalNumberOfRows();
int cellNum;
System.out.println("Row number is " + rowNum);
HSSFRow row;
HSSFCell cell;
for(int i=0;i<sheet.getPhysicalNumberOfRows();i++){
row = sheet.getRow(i);
cellNum = row.getPhysicalNumberOfCells();
System.out.println("cell number is " + cellNum);
for(int j = 0; j < cellNum; j++){
cell=row.getCell(j);
System.out.println("row " + i + "cell "+ j + ":" + getCellValue(cell));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

4.设置单元格格式

Java代码

1. //set font style red and bold
2. HSSFFont font = wb.createFont();
3. font.setColor(HSSFFont.COLOR_RED);
4. font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
6. //create style
7. HSSFCellStyle cellStyle1 = wb.createCellStyle();
8. cellStyle1.setFont(font);
10. //use this style
11. HSSFCell cell1 = row.createCell(1);
12. cell.setCellStyle(cellStyle1);
13. cell.setCellType(HSSFCell.CELL_TYPE_STRING);
14. cell.setCellValue("Title");