【类库教程】Java 实现导出 excel 表 POI

Java 实现导出 excel 表 POI

1.首先下载 poi-3.6-20091214.jar，下载地址如下：

http://download.csdn.net/download/qq_31635851/10026048

官网地址：http://poi.apache.org/

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 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();  
          }  
      }  
  }