一、Apache - poi
1.Apache - poi是java编写的免费开源的跨平台的Java-API,Java-POI,提供给java程序的Microsoft Office格式档案进行读写功能的API开源类库
添加相关jar包
jar包:http://链接:https://pan.baidu.com/s/1O6-6dYINbGqFCe_kEgkITg 提取码:20vc
2.提供不同文件格式的解析:
HSSF
XSSF:Workbook对象实现它
eg:
Workbook workbook = new XSSFWorkbook(传入excel路径文件流);
3.方法:
读:
//将Workbook对象中包含的数据,通过输出流,写入至Excel
Workbook workbook = new XSSFWorkbook(new
FileInputStream("D:\\1627356552686.xlsx"));
workbook.write(out);
(1)sheet:工作簿
获取工作簿数量
Sheet sheet0 = workbook.getSheet("Sheet0");
Sheet sheet1 = workbook.getSheetAt(0);
System.out.println("工作簿1中的数据行:" + sheet0.getLastRowNum());
System.out.println("工作簿2中的数据行:" + sheet1.getLastRowNum());
(2)根据下标获取指定行
Row row = sheet.getsheeAt(0);//第一行下标为0
(2.1)遍历所有行
for(Row row : sheet) {
System.out.println(row);
}
(2.2)遍历所有区域行
for (int i = 1; i <= sheet.getLastRowNum(); i++) {
Row row = sheet.getRow(i);
System.out.println(row);
}
(3)根据下标获取指定单元格
Cell cell = row.getCell(0);//第一个下标为0
(3.1)获得单元格内的值
cell.getStringCellValue();
注意:返回值为数字时调用cell.getNumericCellValue();此方法返回值为double
(3.1)遍历所有单元格
for(Cell cell : row) {
}
写:
Workbook workbook = new XSSFWorkbook(FileOutputStream out = new FileOutputStream("D:\\1\\demo.xlsx"));
(1)创建sheet工作簿
sheet sheet0 = workbook.createSheet();
Sheet sheet1 = workbook.createSheet();
Sheet sheet2 = workbook.createSheet();
(2) 创建数据行Row
Row row = sheet0.createRow(0);
(3) 创建单元格
Cell cell0 = row.createCell(0);
创建单元格的值
cell0.setCellValue();
(4)创建单元格格式
获取格式编码
// 创建单元格样式
DataFormat dataFormat = workbook.createDataFormat();
Short formatCode = dataFormat.getFormat("yyyy-MM-dd HH:mm:ss");
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setDataFormat(formatCode);
// ...
// 为当前行创建单元格
Cell cell1 = row.createCell(1);
cell1.setCellStyle(cellStyle); // 设置单元格样式
cell1.setCellValue(new Date()); // 保存当前日期时间至本单元格
(5)获取列头
Row headRow = sheet.getRow(0);
遍历列头单元格
for(Cell headCell : headRow) {
System.out.print(headCell + "\t");
}
(6)获取当前单元格类型(运用switch循环可以跟单元格类型匹配填入相应的单元格中)
CellType type = cell.getCellType();
例如;根据当前单元格的类型获取其中的值
switch(cellType) { case STRING: String strVal = cell.getStringCellValue(); System.out.print(strVal + "\t"); break; case NUMERIC: double numVal = cell.getNumericCellValue(); System.out.print(numVal + "\t"); break; } }
(7) 在“已存在”的Excel文件中,创建新的sheet
Sheet sheet = workbook.createSheet();//每运行一遍程序,创建一个新的sheet
(8)设置单元格对齐
// 创建单元格样式 CellStyle cellStyle = workbook.createCellStyle(); //设置单元格的水平对齐类型。 此时水平居中 cellStyle.setAlignment(HorizontalAlignment.CENTER); // 设置单元格的垂直对齐类型。 此时垂直靠底边 cellStyle.setVerticalAlignment(VerticalAlignment.BOTTOM);
二、java中关于超大Excel文件解析,XSSF,SXSSF,以及easyExcel的速度比较及其代码实现
1.XSSF类写入30万条数据
package com.yy.demo01;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DataFormat;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class dd {public static void main(String[] args) {
//开始时间
long begin = System.currentTimeMillis();
try (//读取一个已存在的Excel文件
Workbook workbook = new XSSFWorkbook(new FileInputStream("D:\\1\\demo-data.xlsx"));
FileOutputStream out = new FileOutputStream("D:\\1\\100w.xlsx")) {
//在“已存在”的Excel文件中,创建新的sheet
Sheet sheet = workbook.createSheet();
//获取格式编码值
DataFormat dataFormat = workbook.createDataFormat();
Short dateFormatCode = dataFormat.getFormat("yyyy年MM月dd日 HH:mm:ss");
Short moneyFormatCode = dataFormat.getFormat("¥#,###");
//创建日期格式对象
CellStyle dateCellStyle = workbook.createCellStyle();
dateCellStyle.setDataFormat(dateFormatCode);//设置格式编码
//创建货币格式对象
CellStyle moneyCellStyle = workbook.createCellStyle();
moneyCellStyle.setDataFormat(moneyFormatCode);//设置格式编码值
for(int i = 0; i< 300000;i++) {
String name = "A" + i;
//创建行
Row row = sheet.createRow(i + 1);
//创建单元格
Cell cell0 = row.createCell(0);//序号
cell0.setCellValue(String.valueOf(i + 1));
Cell cell1 = row.createCell(1);//姓名
cell1.setCellValue(name);
Cell cell2 = row.createCell(2);//日期
cell2.setCellStyle(dateCellStyle);//货币金额格式对象
cell2.setCellValue(new Date());
Cell cell3 = row.createCell(3);//红包金额
cell3.setCellStyle(moneyCellStyle);//货币金额格式对象
cell3.setCellValue((int)(Math.random()*10000));
}
//写入文件
workbook.write(out);
//结束时间
long end = System.currentTimeMillis();
System.out.println("共耗时:" +(end - begin) + "毫秒");
} catch (IOException e) {
e.printStackTrace();
}
}
}
2.SXSSF类(Workbook workbook = new SXSSFWorkbook(100);
FileOutputStream out = new FileOutputStream("D:\\1\\100w.xlsx"))
............
写入文件
workbook.write(out);
SXSSF类写入30万条数据
package com.yy.demo01;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DataFormat;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
public class Demo10 {
public static void main(String[] args) {
//开始时间
long begin = System.currentTimeMillis();
try (//读取一个已存在的Excel文件
Workbook workbook = new SXSSFWorkbook(100);
FileOutputStream out = new FileOutputStream("D:\\1\\100w.xlsx")) {
//在“已存在”的Excel文件中,创建新的sheet
Sheet sheet = workbook.createSheet();
//获取格式编码值
DataFormat dataFormat = workbook.createDataFormat();
Short dateFormatCode = dataFormat.getFormat("yyyy年MM月dd日 HH:mm:ss");
Short moneyFormatCode = dataFormat.getFormat("¥#,###");
//创建日期格式对象
CellStyle dateCellStyle = workbook.createCellStyle();
dateCellStyle.setDataFormat(dateFormatCode);//设置格式编码
//创建货币格式对象
CellStyle moneyCellStyle = workbook.createCellStyle();
moneyCellStyle.setDataFormat(moneyFormatCode);//设置格式编码值
for(int i = 0; i< 300000;i++) {
String name = "A" + i;
//创建行
Row row = sheet.createRow(i + 1);
//创建单元格
Cell cell0 = row.createCell(0);//序号
cell0.setCellValue(String.valueOf(i + 1));
Cell cell1 = row.createCell(1);//姓名
cell1.setCellValue(name);
Cell cell2 = row.createCell(2);//日期
cell2.setCellStyle(dateCellStyle);//货币金额格式对象
cell2.setCellValue(new Date());
Cell cell3 = row.createCell(3);//红包金额
cell3.setCellStyle(moneyCellStyle);//货币金额格式对象
cell3.setCellValue((int)(Math.random()*10000));
}
//写入文件
workbook.write(out);
//结束时间
long end = System.currentTimeMillis();
System.out.println("共耗时:" +(end - begin) + "毫秒");
} catch (IOException e) {
e.printStackTrace();
}
}
}
2.easyExcel写入30万条数据
准备实体类
public class Order {
@ExcelProperty("订单编号")
private String orderId; // 订单编号
@ExcelProperty("支付金额")
@NumberFormat("¥#,###")
private Double payment; // 支付金额
@ExcelProperty(value = "创建日期",converter = LocalDateTimeConverter.class)
private LocalDateTime creationTime; // 创建时间
public Order() {
this.orderId = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddhhmmss"))
+ UUID.randomUUID().toString().substring(0, 5);
this.payment = Math.random() * 10000;
this.creationTime = LocalDateTime.now();
}
public String getOrderId() {
return orderId;
}
public void setOrderId(String orderId) {
this.orderId = orderId;
}
public Double getPayment() {
return payment;
}
public void setPayment(Double payment) {
this.payment = payment;
}
public LocalDateTime getCreationTime() {
return creationTime;
}
public void setCreationTime(LocalDateTime creationTime) {
this.creationTime = creationTime;
}
@Override
public String toString() {
return "Order [orderId=" + orderId + ", payment=" + payment + ", creationTime=" + creationTime + "]";
}
}
准备converter转换类(兼容LocateDateTime日期时间类)
public class LocalDateTimeConverter implements Converter<LocalDateTime> {
@Override
public Class<LocalDateTime> supportJavaTypeKey() {
return LocalDateTime.class;
}
@Override
public CellDataTypeEnum supportExcelTypeKey() {
return CellDataTypeEnum.STRING;
}
@Override
public LocalDateTime convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
GlobalConfiguration globalConfiguration) {
return LocalDateTime.parse(cellData.getStringValue(), DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}
@Override
public CellData<String> convertToExcelData(LocalDateTime value, ExcelContentProperty contentProperty,
GlobalConfiguration globalConfiguration) {
return new CellData<>(value.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
}
}
写入30万条数据
public class Demo {
public static void main(String[] args) {
// 写入100w
EasyExcel.write("c:\\test\\run\\easy.xlsx", Order.class)
.sheet("订单列表")
.doWrite(data());
}
// 创建100w条订单数据
private static List<Order> data() {
List<Order> list = new ArrayList<Order>();
for (int i = 0; i < 300000; i++) {
list.add(new Order());
}
return list;
}
}