ApachePOI 入门案例

1.创建项目apache_poi

2.添加依赖

    <!-- ApachePOI依赖-->
    <dependencies>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

3. 编写测试类，实现导出excel、导入excel

package com.pomelo.poi;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.junit.Test;

import java.io.FileInputStream;
import java.io.FileOutputStream;

public class ApachePoiDemo {

    //往excel写入数据
    @Test
    public void write() throws Exception {
        // 创建工作簿
        Workbook workbook = new HSSFWorkbook();
        // 创建工作表
        Sheet sheet = workbook.createSheet();
        // 创建第一行
        Row row = sheet.createRow(0);
        // 创建第一行的第一列
        Cell cell = row.createCell(0);
        // 往单元格设置内容
        cell.setCellValue("第一行第一列");

        // 输出excel
        workbook.write(new FileOutputStream("c:\tmp\poi\demo1.xls"));
        workbook.close();
    }

    // 读取excel内容
    @Test
    public void read() throws Exception {
        // 根据excel文件流获取工作簿
        Workbook workbook = new HSSFWorkbook(new FileInputStream("c:\tmp\poi\demo1.xls"));
        // 获取工作表
        Sheet sheet = workbook.getSheetAt(0);
        // 获取第一行
        Row row = sheet.getRow(0);
        // 获取第一行第一列
        Cell cell = row.getCell(0);
        // 获取单元格
        System.out.println("单元格内容：" + cell.getStringCellValue());
        System.out.println("总行数："+sheet.getPhysicalNumberOfRows());
        System.out.println("总列数："+row.getPhysicalNumberOfCells());

        workbook.close();
    }
}