Apache POI 3.14 教程(2)

1-测试入门 新建excel

package dream.poi.test;

import java.io.FileOutputStream;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class NewPOI {

	   /** Excel 文件要存放的位置，假定在E盘下*/
 public static String outputFile = "E:\\POI\\poi.xls";
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		  try {
	            // 创建新的Excel 工作簿
	            HSSFWorkbook workbook = new HSSFWorkbook();
	            
	            // 在Excel工作簿中建一工作表，其名为缺省值
	            // 如要新建一名为"效益指标"的工作表，其语句为：
	            
	            /* HSSFSheet sheet = workbook.createSheet("效益指标");*/
	            HSSFSheet sheet = workbook.createSheet();
	            
	            // 在索引0的位置创建行（最顶端的行）
	            HSSFRow row = sheet.createRow((short)0);
	            
	            //创建字体 红色 加粗
	            HSSFFont font = workbook.createFont();
	            font.setColor(HSSFFont.COLOR_RED);
	            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
	            
	            //创建格式
	            HSSFCellStyle cellStyle= workbook.createCellStyle();
	            cellStyle.setFont(font);
	            
	            //在索引0的位置创建单元格（左上端）
	            HSSFCell cell = row.createCell((short)0);
	            
	            //应用单元格样式
	            cell.setCellStyle(cellStyle);
	            
	            // 定义单元格为字符串类型
	            cell.setCellType(HSSFCell.CELL_TYPE_STRING);
	            
	            // 在单元格中输入一些内容
	            cell.setCellValue("测试");
	            
	            // 新建一输出文件流
	            FileOutputStream fOut = new FileOutputStream(outputFile);
	            
	            // 把相应的Excel 工作簿存盘
	            workbook.write(fOut);
	            fOut.flush();
	            
	            // 操作结束，关闭文件
	            fOut.close();
	            System.out.println("文件生成...");
	            
	        } catch (Exception e) {
	        	
	            System.out.println("已运行 xlCreate() : " + e);
	        }
	}
}

2.读取excel

package dream.poi.test;

import java.io.FileInputStream;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ReadPOI {

    /** Excel文件的存放位置。注意是反斜线*/
    public static String fileToBeRead = "E:\\POI\\poi.xls";
    
    public static void main(String args[]) {
        try {
            // 创建对Excel工作簿文件的引用
            HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead));
            
            // 创建对工作表的引用。
            // 本例是按名引用（让我们假定那张表有着缺省名"Sheet"）
            HSSFSheet sheet = workbook.getSheet("Sheet0");
            
            // 也可用getSheetAt(int index)按索引引用，
            // 在Excel文档中，第一张工作表的缺省索引是0，
            // 其语句为：HSSFSheet sheet = workbook.getSheetAt(0);
            // 读取左上端单元
            HSSFRow row = sheet.getRow(0);
            HSSFCell cell = row.getCell((short)0);
            
            // 输出单元内容，cell.getStringCellValue()就是取所在单元的值
            System.out.println("左上端单元是： " + cell.getStringCellValue());
            
        } catch (Exception e) {
            System.out.println("已运行xlRead() : " + e);
        }
    }
}

1-POI入门

package dream.poi.demo;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;

public class ExportPOI {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		//创建一个student对象的集合 模拟数据
		List studentList = new ArrayList();
		
		//循环模拟赋值
		for(int i=0;i<5;i++){
			
			//创建一个student对象
			Student student = new Student();
			
			//添加数据
			student.setId(i);
			student.setName("我叫POI"+i);
			student.setSex("男");
			student.setAge(i);
			student.setStartTime(new Date());
			
			//加入集合
			studentList.add(student);
		}
		
		//创建excel工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		
		//创建一个工作表 命名为poi
		HSSFSheet poiSheet = workbook.createSheet("poi");
		
		//设置列宽
		poiSheet.setColumnWidth(4, 20*256);
		
		//创建标题行
		HSSFRow row = poiSheet.createRow(0);
		
		//首行单元格
		row.createCell(0).setCellValue("ID");
		row.createCell(1).setCellValue("姓名");
		row.createCell(2).setCellValue("性别");
		row.createCell(3).setCellValue("年龄");
		row.createCell(4).setCellValue("入学时间");
		
		//定义i行
		int i=1;
		
		
		//		格式化时间
		CreationHelper helper = workbook.getCreationHelper();
		CellStyle style = workbook.createCellStyle();
		style.setDataFormat(helper.createDataFormat().getFormat("yyyy-MM-dd hh:mm:ss"));
		
		for (Student student : studentList) {
			
			//创建行
			HSSFRow createRow = poiSheet.createRow((short)i);
			//加载数据
			createRow.createCell(0).setCellValue(student.getId());
			createRow.createCell(1).setCellValue(student.getName());
			createRow.createCell(2).setCellValue(student.getSex());
			createRow.createCell(3).setCellValue(student.getAge());
			
			HSSFCell createCell4 = createRow.createCell(4);
			createCell4.setCellStyle(style);
			createCell4.setCellValue(student.getStartTime());
				
			//变量加1
				i++;
		}
		
		try {
			
			//文件输出流
			FileOutputStream fileOutputStream = new FileOutputStream("E:\\POI\\student.xls");
			
			//输出excel
			workbook.write(fileOutputStream);
			fileOutputStream.flush();
			
			//关闭输出流
			fileOutputStream.close();
			
			System.out.println("文件已保存");
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
  
 2-导入 
  
 
   
package dream.poi.demo;

import java.io.FileInputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ImportPOI {

	public static void main(String[] args) throws IOException {
		
		
			//创建excel工作簿引用
			HSSFWorkbook workbook = new  HSSFWorkbook(new FileInputStream("E:\\POI\\student.xls"));
			
			//获取工作表
			HSSFSheet poiSheet = workbook.getSheet("poi");
			
			//创建一个student对象的集合 模拟数据
			List studentList = new ArrayList();
			
			//循环取值
			for(int i=1;i<=5;i++){
				
				//创建student对象
				Student student=new Student();
				
				//得到工作表，第i行
				HSSFRow row = poiSheet.getRow((short)i);
				
					//获取第一个值
					int id = (int) row.getCell(0).getNumericCellValue();
					student.setId(id);
					
					HSSFCell name = row.getCell(1);
					student.setName(name.toString());
					
					HSSFCell sex = row.getCell(2);
					student.setSex(sex.toString());
					
					int age = (int) row.getCell(3).getNumericCellValue();
					student.setAge(age);
					
					//获取日期类型
					Date startTime = row.getCell(4).getDateCellValue();
					student.setStartTime(startTime);
					
					//集合中添加对象
					studentList.add(student);
			}
			
			//输出
			System.out.println(studentList);
	  }
}
 
   
3-entity
 
   
 
    
package dream.poi.demo;

import java.util.Date;

public class Student {

	//编号
	private Integer id;
	//姓名
	private String name;
	//性别
	private String sex;
	//年龄
	private Integer age;
	//时间
	private Date startTime;
	
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Date getStartTime() {
		return startTime;
	}
	public void setStartTime(Date startTime) {
		this.startTime = startTime;
	}
	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + ", startTime=" + startTime
				+ "]";
	}
}