JAVA POI读写excel简单应用

首先导入poi jar包

我这里用的是 poi-3.11和poi-excelant-3.11后者主要用于支持xlsx

好了进入正题：创建excel操作

package jxlTest;

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

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
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.ss.util.CellRangeAddress;

public class Test {
	public static void main(String[] args) throws IOException {
		//创建excel工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		//创建一个工作表sheet
		HSSFSheet sheet = workbook.createSheet();
		//创建第一行
		HSSFRow row1 = sheet.createRow(0);//参数为行数，为行号-1
		//创建单元格
		HSSFCell cell_1_1 = row1.createCell(0);//参数为列数，从0开始
		cell_1_1.setCellValue("id");
		HSSFCell cell_1_2 = row1.createCell(1);
		cell_1_2.setCellValue("name");
		
		//合并单元格
		sheet.addMergedRegion(new CellRangeAddress(0, 0, 2, 3));//开始行，结束行，开始列，结束列
		//设置单元格样式为居中
		HSSFCellStyle cellStyle = workbook.createCellStyle();
		cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		//设置单元格字体
		HSSFFont font = workbook.createFont();
		font.setFontName("仿宋_GB2312");
		//字体加粗
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		//设置字号
		font.setFontHeight((short)12);
		//提交样式
		cellStyle.setFont(font);
		cell_1_1.setCellStyle(cellStyle);
		
		//保存为xls文件
		File file = new File("d:/test.xls");
		if(!file.exists()){
			file.createNewFile();
		}
		FileOutputStream outputStream = new FileOutputStream(file);
		workbook.write(outputStream);//HSSFWorkbook自带写出文件的功能
		outputStream.close();
		
		
	}
}

读取操作

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

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.ss.usermodel.Cell;

public class ReadTest {

	public static void main(String[] args) throws FileNotFoundException, IOException {
		// TODO Auto-generated method stub
		//需要解析的excel文件
		File file = new File("d:/test.xls");
		HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(file));
		//通过顺序获取一个工作表，也可用过表名获取
		HSSFSheet sheet = workbook.getSheetAt(0);
		//获取本表行数-1
		int lastRowNum = sheet.getLastRowNum();
		System.out.println("最后一行是"+lastRowNum);//如果只有一行的话返回为0，两行返回1
		//开始遍历读取
		for (int i = 0; i <= lastRowNum; i++) {//注意这里的条件是小于等于
			//获取行对象
			HSSFRow row = sheet.getRow(i);
			//获取本行单元格的数量
			int lastCellNum = row.getLastCellNum();
			//遍历单元格的值
			for (int j = 0; j < lastCellNum; j++) {//注意这里是小于号
				HSSFCell cell = row.getCell(j);
				String value = cell.getStringCellValue();
				System.out.print("单元格的值是"+value);
			}
			System.out.println();//打印换行
		}
	}

}