java利用poi开源库实现将数据集写入Excel表格并保存在本地

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一,目前主流的关于读写excel表格的有poi 和jxl开源库，这里只是简单的介绍如何poi将数据集写进Excel表格，并存进本地。

二，官网下载poi的相关jar包，网址 http://poi.apache.org/download.html#POI-4.0.1  

记住下载.zip后缀的 ，.tar.gz是在linux上使用的

三，新建java 项目，将名为poi的jar包导入项目中

新建实体类 BusinessInfo 生成相关方法

package pojo;

import java.io.Serializable;

public class BusinessInfo implements Serializable {

	private static final long serialVersionUID = 6072371965678419954L;
	private String registNumber;// 企业注册号
	private String businessName;// 企业名称

	public BusinessInfo() {
		super();
		// TODO Auto-generated constructor stub
	}

	public BusinessInfo(String registNumber, String businessName) {
		super();
		this.registNumber = registNumber;
		this.businessName = businessName;
	}

	public String getRegistNumber() {
		return registNumber;
	}

	public void setRegistNumber(String registNumber) {
		this.registNumber = registNumber;
	}

	public String getBusinessName() {
		return businessName;
	}

	public void setBusinessName(String businessName) {
		this.businessName = businessName;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((businessName == null) ? 0 : businessName.hashCode());
		result = prime * result + ((registNumber == null) ? 0 : registNumber.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		BusinessInfo other = (BusinessInfo) obj;
		if (businessName == null) {
			if (other.businessName != null)
				return false;
		} else if (!businessName.equals(other.businessName))
			return false;
		if (registNumber == null) {
			if (other.registNumber != null)
				return false;
		} else if (!registNumber.equals(other.registNumber))
			return false;
		return true;
	}

	@Override
	public String toString() {
		return "BusinessInfo [registNumber=" + registNumber + ", businessName=" + businessName + "]";
	}

}

新建工具类  ImageExcel 代码如下

package excel;

import java.io.File;
import java.io.FileOutputStream;
import java.util.List;

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.util.CellRangeAddress;

import pojo.BusinessInfo;

public class ImageExcel {

	/**
	 * 将数据保存进Eacel中
	 * 
	 * @param list
	 *            数据集合
	 * @param savePath
	 *            保存路径
	 */
	public void generateExcel(List<BusinessInfo> list, String savePath) {
		// 创建HSSFWorkbook对象(excel的文档对象)
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 建立新的sheet对象（excel的表单）
		HSSFSheet sheet = workbook.createSheet("工商店铺信息表");
		sheet.setDefaultRowHeightInPoints(12);// 设置缺省列高
		sheet.setDefaultColumnWidth(40);// 设置缺省列宽

		// 在sheet里创建第一行，参数为行索引(excel的行)，可以是0～65535之间的任何一个
		HSSFRow row1 = sheet.createRow(0);
		// 创建单元格（excel的单元格，参数为列索引，可以是0～255之间的任何一个
		HSSFCell cell = row1.createCell(0);
		// 设置单元格内容
		cell.setCellValue("企业工商信息一览表");
		// 合并单元格CellRangeAddress构造参数依次表示起始行，截至行，起始列， 截至列
		sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 3));

		// 在sheet里创建第二行
		HSSFRow row2 = sheet.createRow(1);
		// 创建单元格并设置单元格内容
		row2.createCell(0).setCellValue("企业注册号");
		row2.createCell(1).setCellValue("企业名称");
		for (int i = 0, len = list.size(); i < len; i++) {
			BusinessInfo businessInfo = list.get(i);
			HSSFRow row = sheet.createRow(i + 2);
			row.createCell(0).setCellValue(businessInfo.getRegistNumber());
			row.createCell(1).setCellValue(businessInfo.getBusinessName());

		}

		// 输出Excel文件
		try {
			FileOutputStream fos = new FileOutputStream(new File(savePath));
			workbook.write(fos);
			workbook.close();
			fos.close();
			System.out.println("生成excel文档成功");
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("生成excel文档失败");
		}
	}
}

新建测试类 ImageExcelTest 代码如下

package test;

import java.util.ArrayList;
import java.util.List;

import excel.ImageExcel;
import pojo.BusinessInfo;

public class ImageExcelTest {

	public static void main(String[] args) {
		ImageExcel imageExcel = new ImageExcel();

		BusinessInfo bi1 = new BusinessInfo("10000001", "test1");
		BusinessInfo bi2 = new BusinessInfo("10000002", "test2");
		List<BusinessInfo> list = new ArrayList<BusinessInfo>();
		list.add(bi1);
		list.add(bi2);
		String savePath = "D:/images/test.xls";
		imageExcel.generateExcel(list, savePath);
	}
}

四，运行结果