POI创建Excel的两种方式及解析

方式一:HSSF创建Excel

package com.excel.demo;

import java.io.File;
import java.io.FileOutputStream;

import org.apache.commons.io.FileUtils;
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;

public class PoiCreateExcel {

	/**
	 * POI创建Excel文件
	 * HSSF生成
	 */

	@SuppressWarnings("resource")
	public static void main(String[] args) {

		String[] title = { "id", "name", "age" };

		// 创建工作簿
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 创建一个工作表sheet
		HSSFSheet sheet = workbook.createSheet();
		// 创建第一行
		HSSFRow row = sheet.createRow(0);
		HSSFCell cell = null;
		// 插入第一行数据 id,name,age
		for (int i = 0; i < title.length; i++) {
			cell = row.createCell(i);
			cell.setCellValue(title[i]);
		}
		// 追加数据
		for (int i = 1; i < 10; i++) {
			// 从第一行开始(索引)
			row = sheet.createRow(i);
			// 创建列索引
			cell = row.createCell(0);
			cell.setCellValue("0" + i);
			cell = row.createCell(1);
			cell.setCellValue("张" + i);
			cell = row.createCell(2);
			cell.setCellValue("1" + i);

			// 创建一个文件
			File file = new File("D:/poi_test.xls");
			try {
				file.createNewFile();
				// 将excel内容存盘
				FileOutputStream stream = FileUtils.openOutputStream(file);
				workbook.write(stream);
				stream.close();
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
	}
}

方式二:XSSF创建Excel

package com.excel.demo;

import java.io.File;
import java.io.FileOutputStream;

import org.apache.commons.io.FileUtils;
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.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 PoiCreateExcel2 {

	/**
	 * POI创建Excel文件
	 * XSSF生成,将所有HSSF改为XSSF即可
	 */

	@SuppressWarnings("resource")
	public static void main(String[] args) {

		String[] title = { "id", "name", "age" };

		// 创建工作簿
		XSSFWorkbook workbook = new XSSFWorkbook();
		// 创建一个工作表sheet
		XSSFSheet sheet = workbook.createSheet();
		// 创建第一行
		XSSFRow row = sheet.createRow(0);
		XSSFCell cell = null;
		// 插入第一行数据 id,name,age
		for (int i = 0; i < title.length; i++) {
			cell = row.createCell(i);
			cell.setCellValue(title[i]);
		}
		// 追加数据
		for (int i = 1; i < 10; i++) {
			// 从第一行开始(索引)
			row = sheet.createRow(i);
			// 创建列索引
			cell = row.createCell(0);
			cell.setCellValue("0" + i);
			cell = row.createCell(1);
			cell.setCellValue("张" + i);
			cell = row.createCell(2);
			cell.setCellValue("1" + i);

			// 创建一个文件
			File file = new File("D:/poi_test.xlsx");
			try {
				file.createNewFile();
				// 将excel内容存盘
				FileOutputStream stream = FileUtils.openOutputStream(file);
				workbook.write(stream);
				stream.close();
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
	}
}

POI解析Excel

package com.excel.demo;

import java.io.File;

import org.apache.commons.io.FileUtils;
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;

public class PoiAnalysisExcel {

	/**
	 * POI解析Excel
	 */

	public static void main(String[] args) {

		// 获取需要解析的文件
		File file = new File("D:/poi_test.xls");
		try {
			// 创建Excel,读取文件内容
			HSSFWorkbook workbook = new HSSFWorkbook(FileUtils.openInputStream(file));
			// 读取第一个工作表 (这个有两种获取,知道Sheet名字,直接get就行,不知道读取默认)
			// HSSFSheet sheet = workbook.getSheet("Sheet0");
			// 获取默认第一个工作表Sheet
			HSSFSheet sheetAt = workbook.getSheetAt(0);
			// 获取sheet第一行
			int firstRowNum = 0;
			// 获取sheet中的最后一行
			int lastRowNum = sheetAt.getLastRowNum();
			for (int i = firstRowNum; i <= lastRowNum; i++) {
				// 获取当前行
				HSSFRow row = sheetAt.getRow(i);
				// 获取当前行的最后一列
				short lastCellNum = row.getLastCellNum();
				for (int j = 0; j < lastCellNum; j++) {
					// 获取当前列
					HSSFCell cell = row.getCell(j);
					// 给当前列赋值
					String cellValue = cell.getStringCellValue();
					// 要去掉ln,防止列换行
					System.out.print(cellValue + "  ");
				}
				// 需要换行
				System.out.println();
			}
		} catch (Exception e) {

		}
	}
}