1.这是一个通过Java反射机制解析的工具类
2.使用时只需创建对应的对象，并在Excel的第一行填上对应的属性名
3.首先要添加相关的jar包：
poi-3.8.jar
poi-ooxml-3.9.jar
poi-ooxml-schemas-3.9.jar
xmlbeans-2.6.0.jar
4.看一下Excel的内容：
5.创建对应的实体类：
package com.office.user.dto;
public class UserDTO {
private String idUser;
private String userName;
private String gender;
private String birthDate;
private String idType;
private String idNo;
private String mobile;
public String getIdUser() {
return idUser;
}
public void setIdUser(String idUser) {
this.idUser = idUser;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getBirthDate() {
return birthDate;
}
public void setBirthDate(String birthDate) {
this.birthDate = birthDate;
}
public String getIdType() {
return idType;
}
public void setIdType(String idType) {
this.idType = idType;
}
public String getIdNo() {
return idNo;
}
public void setIdNo(String idNo) {
this.idNo = idNo;
}
public String getMobile() {
return mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
@Override
public String toString() {
return "UserDTO [idUser=" + idUser + ", userName=" + userName + ", gender=" + gender + ", birthDate="
+ birthDate + ", idType=" + idType + ", idNo=" + idNo + ", mobile=" + mobile + "]";
}
}
6.编写工具类：ExcelReader.java
package com.office.poi;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.DateUtil;
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.ss.usermodel.WorkbookFactory;
import com.office.user.dto.UserDTO;
/**
* Excel 解析工具
*
* @author Neo 2017-5-15
*
* 所需jar： poi-3.8.jar poi-ooxml-3.9.jar poi-ooxml-schemas-3.9.jar
* xmlbeans-2.6.0.jar
*
*/
public class ExcelReader {
private String filePath;
private String sheetName;
private Workbook workBook;
private Sheet sheet;
private List columnHeaderList;
private List> listData;
private List> mapData;
private boolean flag;
public ExcelReader(String filePath, String sheetName) {
this.filePath = filePath;
this.sheetName = sheetName;
this.flag = false;
this.load();
}
private void load() {
FileInputStream inStream = null;
try {
inStream = new FileInputStream(new File(filePath));
workBook = WorkbookFactory.create(inStream);
sheet = workBook.getSheet(sheetName);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (inStream != null) {
inStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
private String getCellValue(Cell cell) {
String cellValue = "";
DataFormatter formatter = new DataFormatter();
if (cell != null) {
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
if (DateUtil.isCellDateFormatted(cell)) {
cellValue = formatter.formatCellValue(cell);
} else {
double value = cell.getNumericCellValue();
int intValue = (int) value;
cellValue = value - intValue == 0 &＃63; String.valueOf(intValue) : String.valueOf(value);
}
break;
case Cell.CELL_TYPE_STRING:
cellValue = cell.getStringCellValue();
break;
case Cell.CELL_TYPE_BOOLEAN:
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA:
cellValue = String.valueOf(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK:
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR:
cellValue = "";
break;
default:
cellValue = cell.toString().trim();
break;
}
}
return cellValue.trim();
}
private void getSheetData() {
listData = new ArrayList>();
mapData = new ArrayList>();
columnHeaderList = new ArrayList();
int numOfRows = sheet.getLastRowNum() + 1;
for (int i = 0; i map = new HashMap();
List list = new ArrayList();
if (row != null) {
for (int j = 0; j 0) {
mapData.add(map);
}
listData.add(list);
}
flag = true;
}
public String getCellData(int row, int col) {
if (row <= 0 || col <= 0) {
return null;
}
if (!flag) {
this.getSheetData();
}
if (listData.size() >= row && listData.get(row - 1).size() >= col) {
return listData.get(row - 1).get(col - 1);
} else {
return null;
}
}
public String getCellData(int row, String headerName) {
if (row <= 0) {
return null;
}
if (!flag) {
this.getSheetData();
}
if (mapData.size() >= row && mapData.get(row - 1).containsKey(headerName)) {
return mapData.get(row - 1).get(headerName);
} else {
return null;
}
}
/**
* 获取标题
*
* @param eh
* @param maxX
* @return
*/
public List getTitleList(ExcelReader eh, int maxX) {
List result = new ArrayList();
for (int i = 1; i <= maxX; i++) {
result.add(eh.getCellData(1, i));
}
return result;
}
/**
* 获取单行对象
*
* @param object
* @param eh
* @param maxX
* @param titles
* @return
*/
public Object getObject(String className, ExcelReader eh, int y, List titles) throws Exception {
Object bean = Class.forName(className).newInstance();
int length = titles.size();
for (int x = 0; x clazz, ExcelReader eh, int x, int y, List titles) {
List result = new ArrayList();
String className = clazz.getName();
try {
for (int i = 2; i <=y; i++) {
Object object = eh.getObject(className, eh, i, titles);
result.add(object);
}
} catch (Exception e) {
System.out.println(e);
}
return result;
}
public static void main(String[] args) {
try {
ExcelReader eh = new ExcelReader("C:\\Users\\Neo\\Desktop\\POI.xlsx", "Sheet1");
List titles = eh.getTitleList(eh, 7);
List userList = eh.getDataList(UserDTO.class, eh, 7, 4, titles);
for (Object object : userList) {
System.out.println(object);
}
} catch (Exception e) {
System.out.println(e);
}
}
}
6.看一下测试结果：
备注：这是我写于两年前的测试demo，如果生产上有类似需求更建议使用 EasyExcel
补充知识：简单好用-JAVA使用POI解析Excel
相信使用POI的目前已经非常多了，我这边提供一个非常简单便利又通用的POI解析工具类，代码最后有示例代码。可以按照本文直接使用。
京公网安备 11010802041100号