EasyExcel导入存在合并单元格的Excel

Excel表格

下面是Excel表格,成果简介前可以作为主表数据存储(存在合并),成果简介后的数据作为从表数据存储。
在这里插入图片描述

实现思路

  • 通过EasyExcel读取Excel数据,用List<AwardsDetailField> list接收
    因为POI/EasyExcel对合并单元格的数据只读取一次,需要把为空的单元格也赋值,这是核心技术难点

  • 循环使用hibernate-validator对数据进行校验
    存在校验不通过的数据返回给前端,所有数据校验通过才写入数据库

  • 封装然后写入数据库

    • 用Java8 对List< DetailFeiled> list根据多字段进行分组,得到Map<String,List> map
    • 循环map,封装主表和详细表插入list
    • 批量插入
  • 导入时要求同一年数据可以分多次导入,但同一年内,成果名称不允许重复
    这个可以在数据库中根据获奖类型+获奖年份+成果名称建立联合约束

    1
    ALTER TABLE t_awards ADD CONSTRAINT award_type_year_product UNIQUE (award_type,award_year,award_product);

    参考链接

相关代码

下面贴出的是通过EasyExcel读取Excel数据的测试代码

pom依赖:

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<dependencies>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.6</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.76</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
<scope>provided</scope>
</dependency>
<!--junit测试-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!--slf4j简单实现-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.25</version>
<scope>compile</scope>
</dependency>
</dependencies>

AwardsDetailField类:

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package com.importexcel;
import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;
import java.math.BigDecimal;

/**
* Excel对应的Java实体类
*/
@Data
public class AwardsDetailField {

@ExcelProperty(value="奖项等级(一级分类)",index = 0)
private String topClass;

@ExcelProperty(value="奖项等级(二级分类)",index = 1)
private String secondClass;

@ExcelProperty(value="获奖年份",index = 2)
private String awardYear;

@ExcelProperty(value="获奖产品/成果名称",index = 3)
private String awardProduct;

@ExcelProperty(value="成果简介",index = 4)
private String briefIntroduction;

@ExcelProperty(value="获奖单位",index = 5)
private String company;

@ExcelProperty(value="获奖个人姓名",index = 6)
private String name;

@ExcelProperty(value="员工编号",index = 7)
private String employeeNo;

@ExcelProperty(value="获奖金额(元)",index = 8)
private BigDecimal money;
}

ImportExcelHelper类(导入Excel入口、对合并单元格处理):

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package com.importexcel;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.enums.CellExtraTypeEnum;
import com.alibaba.excel.metadata.CellExtra;
import com.alibaba.excel.util.CollectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.util.List;

public class ImportExcelHelper<T> {

private static final Logger LOGGER = LoggerFactory.getLogger(ImportExcelHelper.class);

/**
* 返回解析后的List
*
* @param: fileName 文件名
* @param: clazz Excel对应属性名
* @param: sheetNo 要解析的sheet
* @param: headRowNumber 正文起始行
* @return java.util.List<T> 解析后的List
*/
public List<T> getList(String fileName, Class<T> clazz, Integer sheetNo, Integer headRowNumber) {
ImportExcelListener<T> listener = new ImportExcelListener<>(headRowNumber);
try {
EasyExcel.read(fileName, clazz, listener).extraRead(CellExtraTypeEnum.MERGE).sheet(sheetNo).headRowNumber(headRowNumber).doRead();
} catch (Exception e) {
LOGGER.error(e.getMessage());
}
List<CellExtra> extraMergeInfoList = listener.getExtraMergeInfoList();
if (CollectionUtils.isEmpty(extraMergeInfoList)) {
return listener.getData();
}
List<T> data = explainMergeData(listener.getData(), extraMergeInfoList, headRowNumber);
return data;
}

/**
* 处理合并单元格
*
* @param data 解析数据
* @param extraMergeInfoList 合并单元格信息
* @param headRowNumber 起始行
* @return 填充好的解析数据
*/
private List<T> explainMergeData(List<T> data, List<CellExtra> extraMergeInfoList, Integer headRowNumber) {
//循环所有合并单元格信息
extraMergeInfoList.forEach(cellExtra -> {
int firstRowIndex = cellExtra.getFirstRowIndex() - headRowNumber;
int lastRowIndex = cellExtra.getLastRowIndex() - headRowNumber;
int firstColumnIndex = cellExtra.getFirstColumnIndex();
int lastColumnIndex = cellExtra.getLastColumnIndex();
//获取初始值
Object initValue = getInitValueFromList(firstRowIndex, firstColumnIndex, data);
//设置值
for (int i = firstRowIndex; i <= lastRowIndex; i++) {
for (int j = firstColumnIndex; j <= lastColumnIndex; j++) {
setInitValueToList(initValue, i, j, data);
}
}
});
return data;
}

/**
* 设置合并单元格的值
*
* @param filedValue 值
* @param rowIndex 行
* @param columnIndex 列
* @param data 解析数据
*/
public void setInitValueToList(Object filedValue, Integer rowIndex, Integer columnIndex, List<T> data) {
T object = data.get(rowIndex);

for (Field field : object.getClass().getDeclaredFields()) {
//提升反射性能,关闭安全检查
field.setAccessible(true);
ExcelProperty annotation = field.getAnnotation(ExcelProperty.class);
if (annotation != null) {
if (annotation.index() == columnIndex) {
try {
field.set(object, filedValue);
break;
} catch (IllegalAccessException e) {
LOGGER.error("设置合并单元格的值异常:"+e.getMessage());
}
}
}
}
}


/**
* 获取合并单元格的初始值
* rowIndex对应list的索引
* columnIndex对应实体内的字段
*
* @param firstRowIndex 起始行
* @param firstColumnIndex 起始列
* @param data 列数据
* @return 初始值
*/
private Object getInitValueFromList(Integer firstRowIndex, Integer firstColumnIndex, List<T> data) {
Object filedValue = null;
T object = data.get(firstRowIndex);
for (Field field : object.getClass().getDeclaredFields()) {
//提升反射性能,关闭安全检查
field.setAccessible(true);
ExcelProperty annotation = field.getAnnotation(ExcelProperty.class);
if (annotation != null) {
if (annotation.index() == firstColumnIndex) {
try {
filedValue = field.get(object);
break;
} catch (IllegalAccessException e) {
LOGGER.error("设置合并单元格的初始值异常:"+e.getMessage());
}
}
}
}
return filedValue;
}
}

Excel模板的读取监听类:

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package com.importexcel;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.CellExtra;
import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

/**
* Excel模板的读取监听类
*
* @author wangwei
*/
public class ImportExcelListener<T> extends AnalysisEventListener<T> {
private static final Logger LOGGER = LoggerFactory.getLogger(ImportExcelListener.class);
/**
* 解析的数据
*/
List<T> list = new ArrayList<>();

/**
* 正文起始行
*/
private Integer headRowNumber;
/**
* 合并单元格
*/
private List<CellExtra> extraMergeInfoList = new ArrayList<>();

public ImportExcelListener(Integer headRowNumber) {
this.headRowNumber = headRowNumber;
}

/**
* 这个每一条数据解析都会来调用
*
* @param data one row value. Is is same as {@link AnalysisContext#readRowHolder()}
* @param context context
*/
@Override
public void invoke(T data, AnalysisContext context) {
LOGGER.info("解析到一条数据: ", JSON.toJSONString(data));
list.add(data);
}

/**
* 所有数据解析完成了 都会来调用
*
* @param context context
*/
@Override
public void doAfterAllAnalysed(AnalysisContext context) {
LOGGER.info("所有数据解析完成!");
}

/**
* 返回解析出来的List
*/
public List<T> getData() {
return list;
}

/**
* 读取额外信息:合并单元格
*/
@Override
public void extra(CellExtra extra, AnalysisContext context) {
LOGGER.info("读取到了一条额外信息:{}", JSON.toJSONString(extra));
switch (extra.getType()) {
case MERGE: {
LOGGER.info(
"额外信息是合并单元格,而且覆盖了一个区间,在firstRowIndex:{},firstColumnIndex;{},lastRowIndex:{},lastColumnIndex:{}",
extra.getFirstRowIndex(), extra.getFirstColumnIndex(), extra.getLastRowIndex(),
extra.getLastColumnIndex());
if (extra.getRowIndex() >= headRowNumber) {
extraMergeInfoList.add(extra);
}
break;
}
default:
}
}

/**
* 返回解析出来的合并单元格List
*/
public List<CellExtra> getExtraMergeInfoList() {
return extraMergeInfoList;
}
}

测试类:

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package com.importexcel;
import com.alibaba.fastjson.JSON;
import java.util.List;

/**
* 测试类
* @createTime 2021/08/06
*/
public class ImportTest {


public static void main(String[] args) {
String PATH = "E:\\Downloads\\";
String fileName = PATH + "各奖励网站导入模版.xlsx";
ImportExcelHelper<AwardsDetailField> helper = new ImportExcelHelper<>();
List<AwardsDetailField> list = helper.getList(fileName,AwardsDetailField.class,0,1);
System.out.println(JSON.toJSONString(list));
}
}

运行后打印的JSON字符串,用JSON工具解析发现完全是想要的效果,成功搞定!
在这里插入图片描述
参考链接

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