Java通过反射将 Excel 解析成对象集合实例

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<String> columnHeaderList;
	private List<List<String>> listData;
	private List<Map<String, String>> 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 ? 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<List<String>>();
		mapData = new ArrayList<Map<String, String>>();
		columnHeaderList = new ArrayList<String>();
		int numOfRows = sheet.getLastRowNum() + 1;
		for (int i = 0; i < numOfRows; i++) {
			Row row = sheet.getRow(i);
			Map<String, String> map = new HashMap<String, String>();
			List<String> list = new ArrayList<String>();
			if (row != null) {
				for (int j = 0; j < row.getLastCellNum(); j++) {
					Cell cell = row.getCell(j);
					if (i == 0) {
						columnHeaderList.add(getCellValue(cell));
					} else {
						map.put(columnHeaderList.get(j), this.getCellValue(cell));
					}
					list.add(this.getCellValue(cell));
				}
			}
			if (i > 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<String> getTitleList(ExcelReader eh, int maxX) {
		List<String> result = new ArrayList<String>();
		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<String> titles) throws Exception {
		Object bean = Class.forName(className).newInstance();
		int length = titles.size();
		for (int x = 0; x < length; x++) {
			try {
				Field field = bean.getClass().getDeclaredField(titles.get(x));
				field.setAccessible(true);
				field.set(bean, eh.getCellData(y, x+1));
			} catch (Exception e) {
				System.out.println("没有对应的方法：" + e);
			}
		}
		return bean;
	}

	/**
	 * 获取Excel数据列表
	 *
	 * @param bean
	 * @param eh
	 * @param x
	 *   每行有多少列数据
	 * @param y
	 *   整个sheet有多少行数据
	 * @param titles
	 * @return
	 */
	public List<Object> getDataList(Class<?> clazz, ExcelReader eh, int x, int y, List<String> titles) {
		List<Object> result = new ArrayList<Object>();
		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<String> titles = eh.getTitleList(eh, 7);
			List<Object> 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。

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

/**
 *
 * Title: ExcelReader<br>
 * Description: 可以读取xls,xlsx等文件<br>
 * Copyright @ 2012~2016 xiaour.github.com<span style="font-size: 1em;"> .All rights reserved.<br></span>
 * @author 小鱼儿
 * @createDate 2016年8月23日
 * @version v1.0
 */
public class ExcelReader {
 private POIFSFileSystem fs;
 private HSSFWorkbook wb;
 private HSSFSheet sheet;
 private HSSFRow row;
 private static Logger logger = LogManager.getLogger(ExcelReader.class);

 private String fileFullPath;
 private int sheetNo;
 public ExcelReader(String fileFullPath, int sheetNo) {
  super();
  this.fileFullPath = fileFullPath;
  this.sheetNo = sheetNo;
 }

 /**
  * 读取Excel数据内容
  * @param InputStream
  * @param sheetNo sheet 页号
  * @return Map 包含单元格数据内容的Map对象
  */
 public List<Map<String,Object>> readExcel() {
  logger.info("开始解析xls...");
  sheetNo--;//从1开始及从0开始
  InputStream is = null;
  try {
   is = new FileInputStream(fileFullPath);
  } catch (FileNotFoundException e1) {
   logger.error(e1);
  }
  Map<String,Object> dataMap = null;
  List<Map<String,Object>> dataList= new ArrayList<>();
  String value = "";
   try {
    fs = new POIFSFileSystem(is);
    wb = new HSSFWorkbook(fs);
   } catch (IOException e) {
    logger.error(e);
   }
   sheet = wb.getSheetAt(sheetNo);
   row = sheet.getRow(0);
   // 标题总列数
   int colNum = row.getPhysicalNumberOfCells();
   String[] keyArray = new String[colNum];
   for (int i = 0; i < colNum; i++) {
    keyArray[i] = getCellFormatValue(row.getCell((short) i));
   }
  int rowNum = sheet.getLastRowNum();
  // 正文内容应该从第二行开始,第一行为表头的标题
  for (int i = 2; i <= rowNum; i++) {
   dataMap= new HashMap<>();
   row = sheet.getRow(i);
   if(row!=null){
    int j = 0;
    while (j < colNum) {
     //这里把列循环到Map
     if(row.getCell((short) j)!=null){
     value = getCellFormatValue(row.getCell((short) j)).trim();
     dataMap.put(keyArray[j],value);
     }
     j++;
    }
    value = "";
    dataList.add(dataMap);
   }
  }
  logger.info("解析xls完成...");
  try {
   if(is!=null)
   is.close();
  } catch (IOException e) {
   logger.error(e.toString());
  }
  return dataList;
 }

 /**
  * 根据HSSFCell类型设置数据
  * @param cell
  * @return
  */
 private String getCellFormatValue(HSSFCell cell) {
  String cellvalue = "";
  if (cell != null) {
   // 判断当前Cell的Type
   switch (cell.getCellType()) {
   // 如果当前Cell的Type为NUMERIC
   case HSSFCell.CELL_TYPE_NUMERIC:
   case HSSFCell.CELL_TYPE_FORMULA: {
    // 判断当前的cell是否为Date
    if (HSSFDateUtil.isCellDateFormatted(cell)) {
     Date date = cell.getDateCellValue();
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
     cellvalue = sdf.format(date);
    }
    // 如果是纯数字
    else {
     // 取得当前Cell的数值
     DecimalFormat df = new DecimalFormat("0");
     String dfStr = df.format(cell.getNumericCellValue());
     cellvalue = dfStr;
    }
    break;
   }
   // 如果当前Cell的Type为STRIN
   case HSSFCell.CELL_TYPE_STRING:
    // 取得当前的Cell字符串
    cellvalue = cell.getRichStringCellValue().getString();
    break;
   // 默认的Cell值
   default:
    cellvalue = " ";
   }
  } else {
   cellvalue = "";
  }
  return cellvalue;

 }

 public static void main(String[] args) {
   List<Map<String, Object>> dataList;
   // 对读取Excel表格标题测试
   ExcelReader excelReader = new ExcelReader("D:\\okcoin-2016-08-3XZS.xls",1);
   dataList = excelReader.readExcel();
   for(Map<String,Object> theMap:dataList){
    System.out.println(theMap);
   }
 }
}

这个类导入相应的jar之后就可以用了哦。

以上这篇Java通过反射将 Excel 解析成对象集合实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持我们。