这篇文章主要介绍“Java怎么实现超大Excel文件解析”，在日常操作中，相信很多人在Java怎么实现超大Excel文件解析问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”Java怎么实现超大Excel文件解析”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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();
}
}
}
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();
}
}
}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300000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;
}
}
所以easyExcel最快，XSSF最慢且占用cpu最高
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