EasyExcel根据对应的实体类模板完成多个sheet的写入与读取

1.展示模板一的实体类

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import io.swagger.annotations.ApiModel;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.validation.constraints.NotBlank;

@Data
@NoArgsConstructor
@AllArgsConstructor
@ApiModel(value="RegObject对象", description="不动产单元")
//表头行高
@HeadRowHeight(30)
//内容单元格行高
@ContentRowHeight(25)
public class RegObject {

    @ExcelProperty(value = "客体类型", index = 0)
    @ColumnWidth(20)
    @NotBlank(message = "客体类型不能为空")
    private String propertyType;

    @ExcelProperty(value = "不动产单元号", index = 1)
    @ColumnWidth(30)
    @NotBlank(message = "不动产单元号不能为空")
    private String regNumber;

}

2.展示模板二的实体类

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.format.DateTimeFormat;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import io.swagger.annotations.ApiModel;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.validation.constraints.NotBlank;
import java.util.Date;

@Data
@NoArgsConstructor
@AllArgsConstructor
@ApiModel(value="IncomeInfo对象", description="受理信息")
//表头行高
@HeadRowHeight(30)
//内容单元格行高
@ContentRowHeight(25)
public class IncomeInfo {

    @ExcelProperty(value = "受理人", index = 0)
    @ColumnWidth(20)
    @NotBlank(message = "受理人不能为空")
    private String incomeMan;

    @ExcelProperty(value = "审批流程", index = 1)
    @ColumnWidth(20)
    @NotBlank(message = "审批流程不能为空")
    private String workId;

    @ExcelProperty(value = "坐落", index = 2)
    @ColumnWidth(20)
    @NotBlank(message = "坐落不能为空")
    private String seatName;

//    @ExcelProperty(value = "结束时间", index = 3)
//    @ColumnWidth(20)
//    @NotBlank(message = "结束时间不能为空")
//    @DateTimeFormat(value = "yyyy年MM月dd日 HH时mm分ss秒")
//    private String endDate;

    @ExcelProperty(value = "结束时间", index = 3)
    @ColumnWidth(20)
    @NotBlank(message = "结束时间不能为空")
    @DateTimeFormat(value = "yyyy-MM-dd HH:mm:ss")
    private Date endDate;
}

3.展示easyExcel实现写入功能的代码

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.guan.study.easyExcelDemo.IncomeInfo;
import com.guan.study.easyExcelDemo.RegObject;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class WriteExcelDemo03 {
    private static final String PATH = "D:\\WorkDirTest2\\测试.xls";

    private static List<String> list = new ArrayList<>();

    public static void main(String[] args) {
        list.add("不动产单元信息");
        list.add("受理信息");
        //如果文件存在就删除
        Path path = Paths.get(PATH);
        if (Files.exists(path)) {
            try {
                Files.delete(path);
            } catch (IOException e) {
                System.out.println("无法删除文件：" + e.getMessage());
            }
        }

        ExcelWriterBuilder write = EasyExcel.write(PATH);
        // 创建ExcelWriter对象
        ExcelWriter excelWriter = write.build();
        // 向Excel的同一个Sheet重复写入数据
        for (int i = 0; i < list.size(); i++) {

            // 创建Sheet对象
            WriteSheet writeSheet = EasyExcel.writerSheet(list.get(i)).build();
            // 设置excel模板寻求首航标题的类
            writeSheet.setClazz(getTargetClass(list.get(i)));
            // 设置数据到该sheet中
            excelWriter.write(data(list.get(i)), writeSheet);

        }
        // 关闭流
        excelWriter.finish();


    }

    /**
     * 根据传入的字符串返回对应的目标类
     */
    private static Class<?> getTargetClass(String str) {
        switch (str) {
            case "不动产单元信息":
                return RegObject.class;
            case "受理信息":
                return IncomeInfo.class;
            default:
                return null;
        }
    }

    /**
     * 模拟前端传过来的数据 不动产单元信息
     */
    private static List<Object> data(String str) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

        List<Object> list = new ArrayList<>();
        switch (str) {
            case "不动产单元信息":
                RegObject regObject1 = new RegObject();
                regObject1.setPropertyType("0008");
                regObject1.setRegNumber("130000000001GB00001F00010001");
                list.add(regObject1);
                RegObject regObject2 = new RegObject();
                regObject2.setPropertyType("0008");
                regObject2.setRegNumber("130000000001GB00001F00010002");
                list.add(regObject2);
                break;
            case "受理信息":
                IncomeInfo info1 = new IncomeInfo();
                info1.setIncomeMan("00000001");
                info1.setWorkId("0001");
                info1.setSeatName("130208");
                //info1.setEndDate(dateFormat.format(new Date()));
                info1.setEndDate(new Date());
                list.add(info1);
                IncomeInfo info2 = new IncomeInfo();
                info2.setIncomeMan("00000001");
                info2.setWorkId("0002");
                info2.setSeatName("130229");
                //info2.setEndDate(dateFormat.format(new Date()));
                info2.setEndDate(new Date());
                list.add(info2);
                break;
        }

        return list;
    }
}

4.展示D:\WorkDirTest2路径下测试.xls中的效果

5.读取excel代码

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.read.metadata.ReadSheet;
import com.guan.study.easyExcelDemo.IncomeInfo;
import com.guan.study.easyExcelDemo.RegObject;

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

public class ReadExcelDemo03 {

    private static List<String> list = new ArrayList<>();

    public static void main(String[] args) {
        list.add("不动产单元信息");
        list.add("受理信息");

        // 读取的excel文件路径
        String filename = "D:\\WorkDirTest2\\测试.xls";

        for (int i = 0; i < list.size(); i++) {
            readExcel(filename, i, getTargetClass(list.get(i)));
        }
        //readExcel(filename, 0, RegObject.class);
        //readExcel(filename, 1, IncomeInfo.class);
    }

    private static <T> void readExcel(String filename, int sheetNo, Class<T> clazz) {
        // 构建ExcelReader对象
        ExcelReader excelReader = EasyExcel.read(filename).build();

        // 构建sheet对象
        ReadSheet sheet = EasyExcel.readSheet(sheetNo)
                .head(clazz) // 指定数据模板
                .registerReadListener(new AnalysisEventListener<T>() {
                    // 每解析一行数据,该方法会被调用一次
                    @Override
                    public void invoke(T data, AnalysisContext context) {
                        System.out.println("解析数据为:" + data.toString());
                    }

                    // 全部解析完成被调用
                    @Override
                    public void doAfterAllAnalysed(AnalysisContext context) {
                        //System.out.println("解析完成...");
                    }
                }).build();

        // 读取sheet
        excelReader.read(sheet);
        // 需要自己关闭流操作,在读取文件时会创建临时文件,如果不关闭,会损耗磁盘,严重的磁盘爆掉
        excelReader.finish();
    }

    /**
     * 根据传入的字符串返回对应的目标类
     */
    private static Class<?> getTargetClass(String str) {
        switch (str) {
            case "不动产单元信息":
                return RegObject.class;
            case "受理信息":
                return IncomeInfo.class;
            default:
                return null;
        }
    }

}

pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.13</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.guan</groupId>
    <artifactId>EasyExcel-study</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>EasyExcel-study</name>
    <description>EasyExcel-study</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.4.3.Final</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.1.3</version>
            <exclusions>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi-ooxml</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi-ooxml-schemas</artifactId>
                </exclusion>
            </exclusions>

        </dependency>


        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>5.2.3</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>5.2.3</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/joda-time/joda-time -->
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.12.5</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>

        <!--swagger-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>

        <!--lombok用来简化实体类：需要安装lombok插件-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.15.3</version>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <!-- Add Lombok Plugin -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>1.18.24</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>