Java POI Excel( pio:纯java操作excel的api )

POI官方网址：http://poi.apache.org/

POI的功能实在很强大，而且是apache的子项目，它下面又包含一些Component，比如处理Excel XLS，PowerPoint PPT，Word DOC，Outlook MSG，Excel XLSX等，下面就简单讲下poi处理excel的一些内容。
下面的jar包来源于当前最新的poi 3.6版本。
1.poi来生成excel
package com.test.poi;
import java.io.FileOutputStream;

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.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFHyperlink;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

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

import org.apache.poi.ss.util.CellRangeAddress;
public class WriteExcel {
public static void main(String[] args) throws Exception {

// 创建Excel的工作书册 Workbook,对应到一个excel文档

HSSFWorkbook wb = new HSSFWorkbook();
// 创建Excel的工作sheet,对应到一个excel文档的tab

HSSFSheet sheet = wb.createSheet("sheet1");
// 设置excel每列宽度

sheet.setColumnWidth(0, 4000);

sheet.setColumnWidth(1, 3500);
// 创建字体样式

HSSFFont font = wb.createFont();

font.setFontName("Verdana");

font.setBoldweight((short) 100);

font.setFontHeight((short) 300);

font.setColor(HSSFColor.BLUE.index);
// 创建单元格样式

HSSFCellStyle style = wb.createCellStyle();

style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

style.setFillForegroundColor(HSSFColor.LIGHT_TURQUOISE.index);

style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
// 设置边框

style.setBottomBorderColor(HSSFColor.RED.index);

style.setBorderBottom(HSSFCellStyle.BORDER_THIN);

style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

style.setBorderRight(HSSFCellStyle.BORDER_THIN);

style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setFont(font);// 设置字体
// 创建Excel的sheet的一行

HSSFRow row = sheet.createRow(0);

row.setHeight((short) 500);// 设定行的高度

// 创建一个Excel的单元格

HSSFCell cell = row.createCell(0);
// 合并单元格(startRow，endRow，startColumn，endColumn)

sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 2));
// 给Excel的单元格设置样式和赋值

cell.setCellStyle(style);

cell.setCellValue("hello world");
// 设置单元格内容格式

HSSFCellStyle style1 = wb.createCellStyle();

style1.setDataFormat(HSSFDataFormat.getBuiltinFormat("h:mm:ss"));
style1.setWrapText(true);// 自动换行
row = sheet.createRow(1);
// 设置单元格的样式格式
cell = row.createCell(0);

cell.setCellStyle(style1);

cell.setCellValue(new Date());
// 创建超链接

HSSFHyperlink link = new HSSFHyperlink(HSSFHyperlink.LINK_URL);

link.setAddress("http://www.baidu.com");

cell = row.createCell(1);

cell.setCellValue("百度");

cell.setHyperlink(link);// 设定单元格的链接
FileOutputStream os = new FileOutputStream("e:\\workbook.xls");

wb.write(os);

os.close();

}
}
2.poi读取excel

package com.test.poi;
import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.Iterator;
import org.apache.poi.hssf.extractor.ExcelExtractor;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;

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

import org.apache.poi.ss.usermodel.Row;
public class ReadExcel {
public static void main(String[] args) throws Exception {

HSSFWorkbook wb = null;

POIFSFileSystem fs = null;

try {

fs = new POIFSFileSystem(new FileInputStream("e:\\workbook.xls"));

wb = new HSSFWorkbook(fs);

} catch (IOException e) {

e.printStackTrace();

}
HSSFSheet sheet = wb.getSheetAt(0);

HSSFRow row = sheet.getRow(0);

HSSFCell cell = row.getCell(0);

String msg = cell.getStringCellValue();

System.out.println(msg);

}

public static void method2() throws Exception {
InputStream is = new FileInputStream("e:\\workbook.xls");

HSSFWorkbook wb = new HSSFWorkbook(new POIFSFileSystem(is));
ExcelExtractor extractor = new ExcelExtractor(wb);

extractor.setIncludeSheetNames(false);

extractor.setFormulasNotResults(false);

extractor.setIncludeCellComments(true);
String text = extractor.getText();

System.out.println(text);

}
public static void method3() throws Exception {

HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream("e:\\workbook.xls"));

HSSFSheet sheet = wb.getSheetAt(0);
for (Iterator<Row> iter = (Iterator<Row>) sheet.rowIterator(); iter.hasNext();) {

Row row = iter.next();

for (Iterator<Cell> iter2 = (Iterator<Cell>) row.cellIterator(); iter2.hasNext();) {

Cell cell = iter2.next();

String content = cell.getStringCellValue();// 除非是sring类型，否则这样迭代读取会有错误

System.out.println(content);

}

}

}

}
注：HSSFWorkbook，XSSFWorkbook的区别：前者是解析出来excel 2007 以前版本的，后缀名为xls的，后者是解析excel 2007 版的，后缀名为xlsx。
在实际应用中，要对excel文件进行判断，该用哪个workbook来对其进行解析处理，而且，通常把这些方法都做了相应封装，使其更面向对象，上例只是main方法的简单示例而已，仅供参考！