java之POI操作Excel表

 excel 表格的路劲问题


 package yiche.com.testPol;

import com.sun.xml.internal.messaging.saaj.packaging.mime.util.LineInputStream;
import javafx.scene.input.RotateEvent;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.Cell;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

public class ExcelOperate {

    public static void main(String[] args) throws Exception{
       System.out.println(readExcel());
    }

    private static List<Student> getStudent() {
        List<Student> list = new ArrayList<Student>();
        Student student1 = new Student("小明", 8, "二年级");
        Student student2 = new Student("小光", 9, "三年级");
        Student student3 = new Student("小花", 10, "四年级");
        list.add(student1);
        list.add(student2);
        list.add(student3);
        return list;
    }

    public static void createExcel(List<Student> list) throws Exception{

         // 创建一个Excel文件

        HSSFWorkbook workbook=new HSSFWorkbook();

        //创建一个工作表
        HSSFSheet sheet=workbook.createSheet("学生表一");

        //添加表头

        HSSFRow row=sheet.createRow(0);
        //设置单元格居中
        HSSFCellStyle cellStyle=workbook.createCellStyle();
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        //添加表头内容  第一列
        HSSFCell headCell=row.createCell(0);
        headCell.setCellValue("姓名");
        //居中
        headCell.setCellStyle(cellStyle);

        //第二列
        headCell=row.createCell(1);
        headCell.setCellValue("年龄");
        headCell.setCellStyle(cellStyle);



        //第三列
        headCell=row.createCell(2  );
        headCell.setCellValue("年级");
        headCell.setCellStyle(cellStyle);


        //添加数据内容
        for(int i=0;i<list.size();i++){

            row=sheet.createRow(i+1);

            Student student=list.get(i);
            //创建单元格 并设置值
            HSSFCell cell=row.createCell(0);
            cell.setCellValue(student.getName());
            cell.setCellStyle(cellStyle);


            cell=row.createCell(1);
            cell.setCellValue(student.getAge());
            cell.setCellStyle(cellStyle);


             cell=row.createCell(2);
             cell.setCellValue(student.getGrade());
             cell.setCellStyle(cellStyle);


        }


        //保存excel文件
        OutputStream outputStream=new FileOutputStream("D:/student.xls");
        workbook.write(outputStream);
        outputStream.close();
    }


    public static List<Student> readExcel() throws Exception{
       List<Student> list=new ArrayList<Student>();
       HSSFWorkbook workbook=null;

       //读取文件
        InputStream inputStream=new FileInputStream("D:/student.xls");
        //输入流作为参数
        workbook=new HSSFWorkbook(inputStream);

        //循环工作流
        for(int i=0;i<workbook.getNumberOfSheets();i++){
            //每张工作表
             HSSFSheet sheet=workbook.getSheetAt(i);
             if (sheet== null){
                 continue;
             }

             //循环行  注意从1开始   不要表头
             for(int row=1;row<=sheet.getLastRowNum();row++){

                 HSSFRow row1=sheet.getRow(row);
                 if (row1 == null){
                     continue;
                 }

                  Student student=new Student();
                 //得到单元格的值
                 HSSFCell cell=row1.getCell(0);

                 if (cell == null){
                     continue;
                 }
                  student.setName(cell.getStringCellValue());

                 cell=row1.getCell(1);
                 if (cell == null){
                     continue;
                 }

                 student.setAge((int)cell.getNumericCellValue());

                 //如果读取的是数值的话  防止错误

                 cell=row1.getCell(2);
                 if (cell == null){
                     continue;

                 }

                 student.setGrade(cell.getStringCellValue());

                 list.add(student);

             }
        }
        return  list;
    }

}

 <!--pol  excel-->

  <dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
  </dependency>
  <dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
  </dependency>
</dependencies>

参考：

单独的excel表
http://blog.csdn.net/kong_gu_you_lan/article/details/52798383

批量的excel表
http://blog.csdn.net/nayun123/article/details/52126428