POI实现java导出Excel功能

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

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sheetHSSFSheet 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shortHSSFRow 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();}}}

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