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));