Java 实现导出excel表 POI
1.先导入相关jar包
2.Student.java
- import java.util.Date;
- public class Student
- {
- private int id;
- private String name;
- private int age;
- private Date birth;
- public Student()
- {
- }
- public Student(int id, String name, int age, Date birth)
- {
- this.id = id;
- this.name = name;
- this.age = age;
- this.birth = birth;
- }
- 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 int getAge()
- {
- return age;
- }
- public void setAge(int age)
- {
- this.age = age;
- }
- public Date getBirth()
- {
- return birth;
- }
- public void setBirth(Date birth)
- {
- this.birth = birth;
- }
- }
3.CreateSimpleExcelToDisk.java
- import java.io.FileOutputStream;
- import java.text.SimpleDateFormat;
- 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 CreateSimpleExcelToDisk
- {
- /**
- * @功能:手工构建一个简单格式的Excel
- */
- private static List<Student> getStudent() throws Exception
- {
- List list = new ArrayList();
- SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd");
- Student user1 = new Student(1, "张三", 16, df.parse("1997-03-12"));
- Student user2 = new Student(2, "李四", 17, df.parse("1996-08-12"));
- Student user3 = new Student(3, "王五", 26, df.parse("1985-11-12"));
- list.add(user1);
- list.add(user2);
- list.add(user3);
- return list;
- }
- public static void main(String[] args) throws Exception
- {
- // 第一步,创建一个webbook,对应一个Excel文件
- HSSFWorkbook wb = new HSSFWorkbook();
- // 第二步,在webbook中添加一个sheet,对应Excel文件中的sheet
- HSSFSheet sheet = wb.createSheet("学生表一");
- // 第三步,在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
- HSSFRow row = sheet.createRow((int) 0);
- // 第四步,创建单元格,并设置值表头 设置表头居中
- HSSFCellStyle style = wb.createCellStyle();
- style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
- HSSFCell cell = row.createCell((short) 0);
- cell.setCellValue("学号");
- cell.setCellStyle(style);
- cell = row.createCell((short) 1);
- cell.setCellValue("姓名");
- cell.setCellStyle(style);
- cell = row.createCell((short) 2);
- cell.setCellValue("年龄");
- cell.setCellStyle(style);
- cell = row.createCell((short) 3);
- cell.setCellValue("生日");
- cell.setCellStyle(style);
- // 第五步,写入实体数据 实际应用中这些数据从数据库得到,
- List list = CreateSimpleExcelToDisk.getStudent();
- for (int i = 0; i < list.size(); i++)
- {
- row = sheet.createRow((int) i + 1);
- Student stu = (Student) list.get(i);
- // 第四步,创建单元格,并设置值
- row.createCell((short) 0).setCellValue((double) stu.getId());
- row.createCell((short) 1).setCellValue(stu.getName());
- row.createCell((short) 2).setCellValue((double) stu.getAge());
- cell = row.createCell((short) 3);
- cell.setCellValue(new SimpleDateFormat("yyyy-mm-dd").format(stu
- .getBirth()));
- }
- // 第六步,将文件存到指定位置
- try
- {
- FileOutputStream fout = new FileOutputStream("E:/students.xls");
- wb.write(fout);
- fout.close();
- }
- catch (Exception e)
- {
- e.printStackTrace();
- }
- }
- }