poi 读与写
poi和easyEccel
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对象的区别，文件后缀
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xls行数最多65536 HSSFWorkbook 写速度快，但是读写数量有限
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xlsx行数最多65536 更多 XSSFWorkbook 耗内存 速度慢，读写量大
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谨记最后记得关闭流，避免耗费内存
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生成表格
package com.liang.poi;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
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.usermodel.XSSFWorkbook;
import org.joda.time.DateTime;
import org.junit.Test;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class poiTestWrite {
@Test//poi-execl写
public void testWrite03() throws IOException {
String PATH = "D:\\IdeaStudySpace\\poi";
//创建一个工作薄
Workbook workbook = new HSSFWorkbook();
//创建一个工作表
Sheet sheet = workbook.createSheet();
//创建一个行
Row row1 = sheet.createRow(0);
//创建一个单元格
Cell cell11 = row1.createCell(0);
cell11.setCellValue("梁伟浩");
Cell cell12 = row1.createCell(1);
cell12.setCellValue("周末学习poi");
//第二行
Row row2 = sheet.createRow(1);
Cell cell21 = row2.createCell(0);
cell21.setCellValue("学习时间");
//（2,2）
Cell cell22 = row2.createCell(1);
String time = new DateTime().toString("yyyy年mm月dd日 HH时mm分ss秒");
cell22.setCellValue(time);
//生成表(io流)
FileOutputStream fileOutputStream = new FileOutputStream(PATH + "梁伟浩学习poi03.xls");
//输出
workbook.write(fileOutputStream);
//关闭流
fileOutputStream.close();
System.out.println("io文件输出成功！！！！！！！！！！2022-12-10");
}
@Test
public void testWrite07() throws IOException {
String PATH = "D:\\IdeaStudySpace\\poi";
//创建一个工作薄
Workbook workbook = new XSSFWorkbook();
//创建一个工作表
Sheet sheet = workbook.createSheet();
//创建一个行
Row row1 = sheet.createRow(0);
//创建一个单元格
Cell cell11 = row1.createCell(0);
cell11.setCellValue("梁伟浩");
Cell cell12 = row1.createCell(1);
cell12.setCellValue("周末学习poi");
//第二行
Row row2 = sheet.createRow(1);
Cell cell21 = row2.createCell(0);
cell21.setCellValue("学习时间");
//（2,2）
Cell cell22 = row2.createCell(1);
String time = new SimpleDateFormat("yyyy年mm月dd日 HH时mm分ss秒").format(new Date());
cell22.setCellValue(time);
//生成表(io流)
FileOutputStream fileOutputStream = new FileOutputStream(PATH + "梁伟浩学习poi07.xls");
//输出
workbook.write(fileOutputStream);
//关闭流
fileOutputStream.close();
System.out.println("io文件输出成功！！！！！！！！！！2022-12-10");
}
@Test
public void testWrite03BigData() throws IOException {
long beginTIME = System.currentTimeMillis();
String PATH = "D:\\IdeaStudySpace\\poi";
//创建一个工作薄
Workbook workbook = new HSSFWorkbook();
//创建一个工作表
Sheet sheet = workbook.createSheet();
for (int rowNum = 0; rowNum < 65536; rowNum++) {
Row row = sheet.createRow(rowNum);
for (int cellrow = 0; cellrow < 10;cellrow++) {
Cell cell = row.createCell(cellrow);
cell.setCellValue(cellrow);
}
}
System.out.println("over");
FileOutputStream fileOutputStream = new FileOutputStream(PATH + "testWrite03BigData.xls");
workbook.write(fileOutputStream);
fileOutputStream.close();
long endTIME = System.currentTimeMillis();
System.out.println((double) endTIME-beginTIME/1000);//秒 时间差
System.out.println("io文件输出成功！！！！！！！！！！2022-12-10");
}
@Test
public void testWrite07BigData() throws IOException {
long beginTIME = System.currentTimeMillis();
String PATH = "D:\\IdeaStudySpace\\poi";
//创建一个工作薄
Workbook workbook = new XSSFWorkbook();
//创建一个工作表
Sheet sheet = workbook.createSheet();
for (int rowNum = 0; rowNum < 65537; rowNum++) {
Row row = sheet.createRow(rowNum);
for (int cellrow = 0; cellrow < 10;cellrow++) {
Cell cell = row.createCell(cellrow);
cell.setCellValue(cellrow);
}
}
System.out.println("over");
FileOutputStream fileOutputStream = new FileOutputStream(PATH + "testWrite07BigData.xls");
workbook.write(fileOutputStream);
fileOutputStream.close();
long endTIME = System.currentTimeMillis();
System.out.println((double) endTIME-beginTIME/1000);//秒 时间差
System.out.println("io文件输出成功！！！！！！！！！！2022-12-10");
}
}
- 读取表格
@Test //poi-execl读
public void poiTestRead1() throws IOException {
//获取文件流
FileInputStream fileInputStream = new FileInputStream(PATH + "梁伟浩学习poi03.xls");
//1。创建一个工作薄
Workbook workbook = new HSSFWorkbook(fileInputStream);
//2.得到表
Sheet sheetAt = workbook.getSheetAt(0);
//3.得到行
Row row = sheetAt.getRow(0);
//4.得到列 得到第一行第一列的值
Cell cell = row.getCell(1);
//获取字符串getStringCellValue
//读取值注意类型，不然会报错 case判断
System.out.println(cell.getStringCellValue());
fileInputStream.close();
//生成表(io流)
FileOutputStream fileOutputStream = new FileOutputStream(PATH + "梁伟浩学习poi07.xls");
//输出
workbook.write(fileOutputStream);
//关闭流
fileOutputStream.close();
System.out.println("io文件输出成功！！！！！！！！！！2022-12-10");
}
- 读取的时候注意类型判断
package com.kuang;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.joda.time.DateTime;
import org.junit.Test;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
public class ExcelTest {
String path = "D:\\狂神说Java\\【狂神】小专题\\POI-EasyExcel\\Bilibili-狂神说java\\kuang-poi\\";
@Test
public void testFormula() throws Exception{
InputStream is = new FileInputStream(path + "计算公式.xls");
Workbook workbook = new HSSFWorkbook(is);
Sheet sheet = workbook.getSheetAt(0);
// 读取第五行第一列
Row row = sheet.getRow(4);
Cell cell = row.getCell(0);
//公式计算器
FormulaEvaluator formulaEvaluator = new HSSFFormulaEvaluator((HSSFWorkbook) workbook);
// 输出单元内容
int cellType = cell.getCellType();
switch (cellType) {
case Cell.CELL_TYPE_FORMULA://2
//得到公式
String formula = cell.getCellFormula();
System.out.println(formula);
CellValue evaluate = formulaEvaluator.evaluate(cell);
//String cellValue = String.valueOf(evaluate.getNumberValue());
String cellValue = evaluate.formatAsString();
System.out.println(cellValue);
break;
}
}
@Test
public void testRead03() throws Exception{
InputStream is = new FileInputStream(path+"狂神观众统计表03.xls");
Workbook workbook = new HSSFWorkbook(is);
Sheet sheet = workbook.getSheetAt(0);
// 读取第一行第一列
Row row = sheet.getRow(0);
Cell cell = row.getCell(0);
// 输出单元内容
System.out.println(cell.getStringCellValue());
// 操作结束，关闭文件
is.close();
}
@Test
public void testRead07() throws Exception{
InputStream is = new FileInputStream(path+"/狂神观众统计表07.xlsx");
Workbook workbook = new XSSFWorkbook(is);
Sheet sheet = workbook.getSheetAt(0);
// 读取第一行第一列
Row row = sheet.getRow(0);
Cell cell = row.getCell(0);
// 输出单元内容
System.out.println(cell.getStringCellValue());
// 操作结束，关闭文件
is.close();
}
@Test
public void testCellType() throws Exception {
InputStream is = new FileInputStream(path+"/会员消费商品明细表.xls");
Workbook workbook = new HSSFWorkbook(is);
Sheet sheet = workbook.getSheetAt(0);
// 读取标题所有内容
Row rowTitle = sheet.getRow(0);
if (rowTitle != null) {// 行不为空
// 读取cell
int cellCount = rowTitle.getPhysicalNumberOfCells();
for (int cellNum = 0; cellNum < cellCount; cellNum++) {
Cell cell = rowTitle.getCell(cellNum);
if (cell != null) {
int cellType = cell.getCellType();
String cellValue = cell.getStringCellValue();
System.out.print(cellValue + "|");
}
}
System.out.println();
}
// 读取商品列表数据
int rowCount = sheet.getPhysicalNumberOfRows();
for (int rowNum = 1; rowNum < rowCount; rowNum++) {
Row rowData = sheet.getRow(rowNum);
if (rowData != null) {// 行不为空
// 读取cell
int cellCount = rowTitle.getPhysicalNumberOfCells();
for (int cellNum = 0; cellNum < cellCount; cellNum++) {
System.out.print("【" + (rowNum + 1) + "-" + (cellNum + 1) + "】");
Cell cell = rowData.getCell(cellNum);
if (cell != null) {
int cellType = cell.getCellType();
//判断单元格数据类型
String cellValue = "";
switch (cellType) {
case HSSFCell.CELL_TYPE_STRING://字符串
System.out.print("【STRING】");
cellValue = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BOOLEAN://布尔
System.out.print("【BOOLEAN】");
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK://空
System.out.print("【BLANK】");
break;
case HSSFCell.CELL_TYPE_NUMERIC:
System.out.print("【NUMERIC】");
//cellValue = String.valueOf(cell.getNumericCellValue());
if (HSSFDateUtil.isCellDateFormatted(cell)) {//日期
System.out.print("【日期】");
Date date = cell.getDateCellValue();
cellValue = new DateTime(date).toString("yyyy-MM-dd");
} else {
// 不是日期格式，则防止当数字过长时以科学计数法显示
System.out.print("【转换成字符串】");
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cellValue = cell.toString();
}
break;
case Cell.CELL_TYPE_ERROR:
System.out.print("【数据类型错误】");
break;
}
System.out.println(cellValue);
}
}
}
}
is.close();
}
@Test
public void testWrite03() throws IOException {
// 创建新的Excel 工作簿
Workbook workbook = new HSSFWorkbook();
// 在Excel工作簿中建一工作表，其名为缺省值 Sheet0
//Sheet sheet = workbook.createSheet();
// 如要新建一名为"会员登录统计"的工作表，其语句为：
Sheet sheet = workbook.createSheet("狂神观众统计表");
// 创建行（row 1）
Row row1 = sheet.createRow(0);
// 创建单元格（col 1-1）
Cell cell11 = row1.createCell(0);
cell11.setCellValue("今日新增关注");
// 创建单元格（col 1-2）
Cell cell12 = row1.createCell(1);
cell12.setCellValue(999);
// 创建行（row 2）
Row row2 = sheet.createRow(1);
// 创建单元格（col 2-1）
Cell cell21 = row2.createCell(0);
cell21.setCellValue("统计时间");
//创建单元格（第三列）
Cell cell22 = row2.createCell(1);
String dateTime = new DateTime().toString("yyyy-MM-dd HH:mm:ss");
cell22.setCellValue(dateTime);
// 新建一输出文件流（注意：要先创建文件夹）
FileOutputStream out = new FileOutputStream(path+"狂神观众统计表03.xls");
// 把相应的Excel 工作簿存盘
workbook.write(out);
// 操作结束，关闭文件
out.close();
System.out.println("文件生成成功");
}
@Test
public void testWrite07() throws IOException {
// 创建新的Excel 工作簿, 只有对象变了
Workbook workbook = new XSSFWorkbook();
// 如要新建一名为"会员登录统计"的工作表，其语句为：
Sheet sheet = workbook.createSheet("狂神观众统计表");
// 创建行（row 1）
Row row1 = sheet.createRow(0);
// 创建单元格（col 1-1）
Cell cell11 = row1.createCell(0);
cell11.setCellValue("今日新增关注");
// 创建单元格（col 1-2）
Cell cell12 = row1.createCell(1);
cell12.setCellValue(666);
// 创建行（row 2）
Row row2 = sheet.createRow(1);
// 创建单元格（col 2-1）
Cell cell21 = row2.createCell(0);
cell21.setCellValue("统计时间");
//创建单元格（第三列）
Cell cell22 = row2.createCell(1);
String dateTime = new DateTime().toString("yyyy-MM-dd HH:mm:ss");
cell22.setCellValue(dateTime);
// 新建一输出文件流（注意：要先创建文件夹）
FileOutputStream out = new FileOutputStream(path+"狂神观众统计表07.xlsx");
// 把相应的Excel 工作簿存盘
workbook.write(out);
// 操作结束，关闭文件
out.close();
System.out.println("文件生成成功");
}
@Test
public void testWrite03BigData() throws IOException {
//记录开始时间
long begin = System.currentTimeMillis();
//创建一个SXSSFWorkbook
Workbook workbook = new HSSFWorkbook();
//创建一个sheet
Sheet sheet = workbook.createSheet();
//xls文件最大支持65536行
for (int rowNum = 0; rowNum < 65536; rowNum++) {
//创建一个行
Row row = sheet.createRow(rowNum);
for (int cellNum = 0; cellNum < 10; cellNum++) {//创建单元格
Cell cell = row.createCell(cellNum);
cell.setCellValue(cellNum);
}
}
System.out.println("done");
FileOutputStream out = new FileOutputStream(path+"bigdata03.xls");
workbook.write(out);
// 操作结束，关闭文件
out.close();
//记录结束时间
long end = System.currentTimeMillis();
System.out.println((double)(end - begin)/1000);
}
@Test
public void testWrite07BigData() throws IOException {
//记录开始时间
long begin = System.currentTimeMillis();
//创建一个XSSFWorkbook
Workbook workbook = new XSSFWorkbook();
//创建一个sheet
Sheet sheet = workbook.createSheet();
//xls文件最大支持65536行
for (int rowNum = 0; rowNum < 100000; rowNum++) {
//创建一个行
Row row = sheet.createRow(rowNum);
for (int cellNum = 0; cellNum < 10; cellNum++) {//创建单元格
Cell cell = row.createCell(cellNum);
cell.setCellValue(cellNum);
}
}
System.out.println("done");
FileOutputStream out = new FileOutputStream(path+"bigdata07.xlsx");
workbook.write(out);
// 操作结束，关闭文件
out.close();
//记录结束时间
long end = System.currentTimeMillis();
System.out.println((double)(end - begin)/1000);
}
@Test
public void testWrite07BigDataFast() throws IOException {
//记录开始时间
long begin = System.currentTimeMillis();
//创建一个SXSSFWorkbook
Workbook workbook = new SXSSFWorkbook();
//创建一个sheet
Sheet sheet = workbook.createSheet();
//xls文件最大支持65536行
for (int rowNum = 0; rowNum < 100000; rowNum++) {
//创建一个行
Row row = sheet.createRow(rowNum);
for (int cellNum = 0; cellNum < 10; cellNum++) {//创建单元格
Cell cell = row.createCell(cellNum);
cell.setCellValue(cellNum);
}
}
System.out.println("done");
FileOutputStream out = new FileOutputStream(path+"bigdata07-fast.xlsx");
workbook.write(out);
// 操作结束，关闭文件
out.close();
//清除临时文件
((SXSSFWorkbook)workbook).dispose();
//记录结束时间
long end = System.currentTimeMillis();
System.out.println((double)(end - begin)/1000);
}
}
- xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.kuang</groupId>
<artifactId>kuang-poi</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!--xls(03)-->
<!--<dependency>-->
<!--<groupId>org.apache.poi</groupId>-->
<!--<artifactId>poi</artifactId>-->
<!--<version>3.9</version>-->
<!--</dependency>-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.1.7</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
<!--xlsx(07)-->
<!--<dependency>-->
<!--<groupId>org.apache.poi</groupId>-->
<!--<artifactId>poi-ooxml</artifactId>-->
<!--<version>3.9</version>-->
<!--</dependency>-->
<!--日期格式化工具-->
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.10.1</version>
</dependency>
<!--test-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
</project>