poi学习

需要节点

 <dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.17-beta1</version>
</dependency>

 

创建一个学生类，并录入简单的属性

private Integer id;
private String name;
private Integer age;

在测试类中编写代码：

//插入单行数据
@Test
    public void hssTmp() throws IOException {
        HSSFWorkbook wk=new HSSFWorkbook();
        HSSFSheet sheet=wk.createSheet("学生表");
        HSSFRow row=sheet.createRow(0);
        HSSFCell cell=row.createCell(0);//此时后面不能+".setCellValue("")"，否则会报错
        cell.setCellValue("学生成绩表");
        sheet.addMergedRegion(new CellRangeAddress(0,0,0,2));
        HSSFRow row1 =sheet.createRow(1);
        row1.createCell(0).setCellValue("学生编号");
        row1.createCell(1).setCellValue("学生姓名");
        row1.createCell(2).setCellValue("学生年龄");

        HSSFRow row2 =sheet.createRow(2);
        row2.createCell(0).setCellValue("1");
        row2.createCell(1).setCellValue("张三");
        row2.createCell(2).setCellValue("20");
        FileOutputStream outputStream=new FileOutputStream("E:\workbook.xls");
        wk.write(outputStream);
        outputStream.flush();
    }

//将集合数据插入文件

@Test
    public void outExcel() throws IOException {
        HSSFWorkbook wk=new HSSFWorkbook();
        HSSFSheet sheet=wk.createSheet("学生表");

        HSSFRow row =sheet.createRow(0);

        HSSFCell cell=row.createCell(0);
        cell.setCellValue("学生编号");
        cell=row.createCell((short)1);

        cell.setCellValue("学生姓名");
        cell=row.createCell((short)2);

        cell.setCellValue("学生年龄");
        cell=row.createCell((short)3);

        List<Student> list=new ArrayList<Student>();
        Student stu1=new Student();
        stu1.setId(1);
        stu1.setName("张三");
        stu1.setAge(20);

        Student stu2=new Student();
        stu2.setId(2);
        stu2.setName("李四");
        stu2.setAge(20);

        Student stu3=new Student();
        stu3.setId(3);
        stu3.setName("王五");
        stu3.setAge(20);

        for (short i=0; i<list.size();i++ ){
            row=sheet.createRow(i+1);
            row.createCell(0).setCellValue(list.get(i).getId());
            row.createCell(1).setCellValue(list.get(i).getId());
            row.createCell(2).setCellValue(list.get(i).getId());
        }
    }