Java利用POI实现导入导出Excel表格示例代码

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelOperate {

  public static void main(String[] args) {
    // 创建Excel表格
    createExcel(getStudent());

    // 读取Excel表格
    List list = readExcel();
    System.out.println(list.toString());
  }

  /**
   * 初始化数据
   * 
   * @return 数据
   */
  private static List getStudent() {
    List list = new ArrayList();
    Student student1 = new Student("小明", 8, "二年级");
    Student student2 = new Student("小光", 9, "三年级");
    Student student3 = new Student("小花", 10, "四年级");
    list.add(student1);
    list.add(student2);
    list.add(student3);
    return list;
  }

  /**
   * 创建Excel
   * 
   * @param list
   *      数据
   */
  private static void createExcel(List list) {
    // 创建一个Excel文件
    HSSFWorkbook workbook = new HSSFWorkbook();
    // 创建一个工作表
    HSSFSheet sheet = workbook.createSheet("学生表一");
    // 添加表头行
    HSSFRow hssfRow = sheet.createRow(0);
    // 设置单元格格式居中
    HSSFCellStyle cellStyle = workbook.createCellStyle();
    cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);

    // 添加表头内容
    HSSFCell headCell = hssfRow.createCell(0);
    headCell.setCellValue("姓名");
    headCell.setCellStyle(cellStyle);

    headCell = hssfRow.createCell(1);
    headCell.setCellValue("年龄");
    headCell.setCellStyle(cellStyle);

    headCell = hssfRow.createCell(2);
    headCell.setCellValue("年级");
    headCell.setCellStyle(cellStyle);

    // 添加数据内容
    for (int i = 0; i  readExcel() {
    List list = new ArrayList();
    HSSFWorkbook workbook = null;

    try {
      // 读取Excel文件
      InputStream inputStream = new FileInputStream("D:/students.xls");
      workbook = new HSSFWorkbook(inputStream);
      inputStream.close();
    } catch (Exception e) {
      e.printStackTrace();
    }

    // 循环工作表
    for (int numSheet = 0; numSheet 

public class Student {

  private String name;
  private int age;
  private String grade;

  public Student() {
  }

  public Student(String name, int age, String grade) {
    super();
    this.name = name;
    this.age = age;
    this.grade = grade;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public String getGrade() {
    return grade;
  }

  public void setGrade(String grade) {
    this.grade = grade;
  }

  @Override
  public String toString() {
    return "Student [name=" + name + ", age=" + age + ", grade=" + grade
        + "]";
  }
}

[Student [name=小明, age=8, grade=二年级], Student [name=小光, age=9, grade=三年级], Student [name=小花, age=10, grade=四年级]]