<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.12</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.12</version>
</dependency>

package com.zns.bean;public class Person {private int id;private String name;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Person(int id, String name) {super();this.id = id;this.name = name;}public Person() {super();// TODO Auto-generated constructor stub
    }@Overridepublic String toString() {return "Person [id=" + id + ", name=" + name + "]";}}

package com.zns.test;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;import org.apache.poi.hssf.usermodel.HSSFCell;
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;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import com.zns.bean.Person;public class Test2 {public static void main(String[] args) throws Exception {// func1();// func2();// func3();
    }//导出到excelprivate static void func1() {Date currentTime = new Date();SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");String dateStr = formatter.format(currentTime);// 导出xls用HSSFWorkbook,导出xlsx用XSSFWorkbook// String outFileName = dateStr + ".xls";// Workbook wb = new HSSFWorkbook();
String outFileName = dateStr + ".xlsx";Workbook wb = new XSSFWorkbook();Sheet sheet1 = (Sheet) wb.createSheet("sheet001");Row row = (Row) sheet1.createRow(0);String[] headers = { "编号", "姓名" };for (int i = 0; i < headers.length; i++) {Cell cell = row.createCell(i);cell.setCellValue(headers[i]);}List<Person> list = new ArrayList<Person>();list.add(new Person(1, "张三"));list.add(new Person(2, "李四"));for (int i = 0; i < list.size(); i++) {row = sheet1.createRow((int) i + 1);Person obj = (Person) list.get(i);row.createCell(0).setCellValue(obj.getId());row.createCell(1).setCellValue(obj.getName());}try {FileOutputStream fout = new FileOutputStream("D:/" + outFileName);wb.write(fout);fout.close();System.out.println("导出成功...");} catch (Exception e) {e.printStackTrace();}}//从excel导入private static void func2() throws FileNotFoundException, IOException {// InputStream is = new FileInputStream("D://test.xls");// Workbook wb = new HSSFWorkbook(is);InputStream is = new FileInputStream("D://test.xlsx");Workbook wb = new XSSFWorkbook(is);List<Person> list = new ArrayList<Person>();Sheet sheet1 = (Sheet) wb.getSheetAt(0);for (int rowNum = 1; rowNum <= sheet1.getLastRowNum(); rowNum++) {Row row = (Row) sheet1.getRow(rowNum);if (row != null) {Person obj = new Person();Cell cell0 = row.getCell(0);cell0.setCellType(Cell.CELL_TYPE_STRING);Cell cell1 = row.getCell(1);obj.setId(Integer.parseInt(cell0.getStringCellValue()));obj.setName(cell1.getStringCellValue());list.add(obj);}}System.out.println(list);}//从excel模板获取内容 再导出private static void func3() throws IOException, FileNotFoundException {// excel模板路径File fi = new File("D:\\test.xls");POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(fi));// 读取excel模板HSSFWorkbook wb = new HSSFWorkbook(fs);// 读取了模板内sheet0HSSFSheet sheet = wb.getSheetAt(0);// 在相应的单元格进行赋值HSSFCell cell = sheet.getRow(1).getCell(3);cell.setCellValue("aa");HSSFCell cell2 = sheet.getRow(3).getCell(3);cell2.setCellValue("bb");HSSFCell cell3 = sheet.getRow(0).getCell(0);cell3.setCellValue("cc");// 修改模板内容导出新文件FileOutputStream out = new FileOutputStream("D:/export.xls");wb.write(out);out.close();}}