一、导入Jar包、引入MAVEN依赖
1.涉及的jar包: poi、poi-ooxml、poi-ooxml-schemas、xmlbeans、dom4j
2.maven库: https://mvnrepository.com/
3.依赖引入/Jar包导入
二、文件格式校验
1）判断Excel文件是否存在
/**
* 检查文件是否为excel或者为空
*
* @param filePath 文件路径
* @return boolean
*/
public boolean validateExcel(String filePath) {
//检查文件格式
if (!(ReadExcel.isExcel2003(filePath) || ReadExcel.isExcel2007(filePath))) {
errorInfo = "不是excel格式";
return false;
}
//检查文件是否存在
File file = new File(filePath);
if (!file.exists()) {
errorInfo = "文件不存在";
return false;
}
return true;
}
2）判断Excel文件类型
/**
* 判断是否xls格式
*
* @param filePath
* @return boolean
*/
public static boolean isExcel2003(String filePath) {
return filePath.matches("^.+\\.(?i)(xls)$");
}
/**
* 判断是否xlsx格式
*
* @param filePath 文件路径
* @return boolean
*/
public static boolean isExcel2007(String filePath) {
return filePath.matches("^.+\\.(?i)(xlsx)$");
}
三、Excel解析
1）Excel文件流解析
/**
* 文件及类型解析
*
* @param filePath 文件路径
* @return List>
*/
public List> read(String filePath) {
List> dataList = new ArrayList<>();
InputStream is = null;
if (!validateExcel(filePath)) {
return null;
} else {
try {
//判断文件类型
boolean isExcel2003 = true;
if (ReadExcel.isExcel2007(filePath)) {
isExcel2003 = false;
}
//调用读取方法
File file = new File(filePath);
is = new FileInputStream(file);
dataList = readStream(is, isExcel2003);
is.close();
} catch (Exception e) {
errorInfo = "文件上传失败，请重新上传";
}
return dataList;
}
}
/**
* 文件及类型解析
*
* @param inputStream 文件输入流
* @param isExcel2003 是否是xls
* @return List>
* @throws Exception 抛出
*/
public List> readStream(InputStream inputStream, boolean isExcel2003) throws Exception {
List> dataList = null;
Workbook wb = null;
if (isExcel2003) {
//HSSF是POI工程对Excel 97(-2007)文件操作
wb = new HSSFWorkbook(inputStream);
} else {
//XSSF是POI工程对Excel 2007 OOXML (.xlsx)文件操作
wb = new XSSFWorkbook(inputStream);
}
dataList = readWork(wb);
return dataList;
}
2）Excel解析主方法
/**
* Excel解析主方法
*
* @param wb excel的对象
* @return List>
*/
public List> readWork(Workbook wb) {
List> dataList = new ArrayList<>();
//用于记录不匹配列
StringBuffer stringBuffer = new StringBuffer();
//得到第一个shell
Sheet sheet = wb.getSheetAt(0);
this.totalRows = sheet.getPhysicalNumberOfRows();
if (this.totalRows >= 2 && sheet.getRow(1) != null) {
this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
//校验模板是否正确
if (totalCells != title.length) {
errorInfo = "Excel模板列数与导入Excel列数不匹配！！！";
} else {
for (int i = 0; i < title.length; i++) {
//第一行列取值
String topTitle = String.valueOf(sheet.getRow(0).getCell(i));
if (!title[i].equals(topTitle)) {
stringBuffer.append("《");
stringBuffer.append(topTitle);
stringBuffer.append("》");
stringBuffer.append(",");
}
}
if (stringBuffer.length() > 0) {
stringBuffer.deleteCharAt(stringBuffer.length() - 1);
errorInfo = "Excel模板不存在" + stringBuffer + "列标题！！！";
}
}
//解析Excel
if (errorInfo == null) {
//循环excel的行
for (int r = 1; r < this.getTotalRows(); r++) {
Row row = sheet.getRow(r);
if (row == null) {
continue;
}
//rowList集合对应每一行数据
List rowList = new ArrayList<>();
//循环excel的列
for (int c = 0; c < this.getTotalCells(); c++) {
Cell cell = row.getCell(c);
String cellValue = "";
if (cell != null) {
//判断数据类型
switch (cell.getCellType()) {
//数字
case HSSFCell.CELL_TYPE_NUMERIC:
cellValue = cell.getNumericCellValue() + "";
break;
//字符串
case HSSFCell.CELL_TYPE_STRING:
cellValue = cell.getStringCellValue();
break;
//布尔
case HSSFCell.CELL_TYPE_BOOLEAN:
cellValue = cell.getBooleanCellValue() + "";
break;
//公式
case HSSFCell.CELL_TYPE_FORMULA:
cellValue = cell.getCellFormula() + "";
break;
//空
case HSSFCell.CELL_TYPE_BLANK:
cellValue = "";
break;
//故障
case HSSFCell.CELL_TYPE_ERROR:
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
}
rowList.add(cellValue);
}
dataList.add(rowList);
}
return dataList;
} else {
return null;
}
} else {
errorInfo = "请核查Excel是否存在数据！！！";
return null;
}
}
四、方法调用
package com.work.excel;
import org.apache.poi.hssf.usermodel.HSSFCell;
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 java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
public class ReadExcel {
/**
* 总行数
*/
private int totalRows = 0;
/**
* 总列数
*/
private int totalCells = 0;
/**
* 错误信息
*/
private String errorInfo = null;
/**
* 模板标题列
*/
String[] title = {"姓名", "年龄", "学历", "手机号", "邮箱", "地址"};
private ReadExcel() {
}
public int getTotalRows() {
return totalRows;
}
public int getTotalCells() {
return totalCells;
}
public String getErrorInfo() {
return errorInfo;
}
/**
* 方法调用
*/
public void mainMothd(){
ReadExcel t = new ReadExcel();
//地址范例
String filePath = "C:\\Users\\Administrator\\Desktop\\模板.xlsx";
List> list = t.read(filePath);
if (list != null) {
System.out.println("********************正在解析***********************");
for (int i = 0; i < list.size(); i++) {
System.out.print("第" + (i + 1) + "行：");
List cellList = list.get(i);
for (String s : cellList) {
System.out.print(" " + s);
}
System.out.println();
}
System.out.println("********************解析完成***********************");
} else {
System.out.println(t.getErrorInfo());
}
}
/**
* main方法
* @param args
*/
public static void main(String[] args) {
ReadExcel t = new ReadExcel();
t.mainMothd();
}
}