java實現excel導出
- 2019 年 10 月 8 日
- 筆記
1.首先下載poi-3.6-20091214.jar，下載地址如下：
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：手工構建一個簡單格式的Excel */ private static List<Student> getStudent() throws Exception { List list = new ArrayList(); SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd"); Student user1 = new Student(1, "張三", 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，創建一個webbook，對應一個Excel文件 HSSFWorkbook wb = new HSSFWorkbook(); // 第二步，在webbook中添加一個sheet,對應Excel文件中的sheet HSSFSheet sheet = wb.createSheet("學生表一"); // 第三步，在sheet中添加表頭第0行,注意老版本poi對Excel的行數列數有限制short HSSFRow row = sheet.createRow((int) 0); // 第四步，創建單元格，並設置值表頭 設置表頭居中 HSSFCellStyle style = wb.createCellStyle(); style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 創建一個居中格式 HSSFCell cell = row.createCell((short) 0); cell.setCellValue("學號"); cell.setCellStyle(style); cell = row.createCell((short) 1); cell.setCellValue("姓名"); cell.setCellStyle(style); cell = row.createCell((short) 2); cell.setCellValue("年齡"); cell.setCellStyle(style); cell = row.createCell((short) 3); cell.setCellValue("生日"); cell.setCellStyle(style); // 第五步，寫入實體數據 實際應用中這些數據從資料庫得到， 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，創建單元格，並設置值 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，將文件存到指定位置 try { FileOutputStream fout = new FileOutputStream("E:/students.xls"); wb.write(fout); fout.close(); } catch (Exception e) { e.printStackTrace(); } } }
