Java POI 导出excel表

1.首先下载poi-3.6-20091214.jar，下载地址如下：

http://download.csdn.net/detail/evangel_z/3895051

2.Student.java

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();
         }
     }
 }

　POI 获取sheet总数

 wb.getNumberOfSheets()

删除sheet

   wb.removeSheetAt(wb.getSheetIndex(sheetName));