EasyExcel莫名失效，映射到StudentInfoExcel中，属性都是null，经过一系列排查，是easyExcel版本未指定明确问题。2.2.6
项目中的结构是父子依赖的。这种方式本地没有问题，但是发布到服务器就还有原来的问题。
所以解决方式是在Excel类上加@Accessors(chain = false)

@Data
@ColumnWidth(25)
@HeadRowHeight(20)
@ContentRowHeight(18)
@Accessors(chain = false)
public class StudentExcel implements Serializable {private static final long serialVersionUID = 3096634685988807546L;@ColumnWidth(18)@ExcelProperty(value = "*学生姓名", index = 0)private String realName;@ColumnWidth(20)@ExcelProperty(value = "*手机号", index = 1)private String telephone;@ColumnWidth(18)@ExcelProperty(value = "出生日期（年/月/日，例如 2021/10/10）", index = 2)@DateTimeFormat(pattern = ColumnFormatter.PATTERN_DATE)@JsonFormat(pattern = ColumnFormatter.PATTERN_DATE)private Date birthday;@ColumnWidth(10)@ExcelProperty(value = "性别（男/女）", index = 3)private String genderName;@ColumnWidth(25)@ExcelProperty(value = "公立学校（20字以内）", index = 4)private String publicSchool;}

1. 这个是顶层la-parent依赖

<?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><groupId>org.lookahead</groupId><artifactId>la-parent</artifactId><version>0.0.4-SNAPSHOT</version><name>la-parent</name><description>la-parent</description><packaging>pom</packaging><properties><!-- base --><java.version>1.8</java.version><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><!-- maven --><maven.compiler.encoding>UTF-8</maven.compiler.encoding><maven.test.skip>true</maven.test.skip><maven.plugin.version>3.8.1</maven.plugin.version><versions-maven-plugin.version>2.3</versions-maven-plugin.version><!-- spring --><spring-boot-dependencies.version>2.7.15</spring-boot-dependencies.version><spring-cloud-dependencies.version>2021.0.5</spring-cloud-dependencies.version><spring.cloud.alibaba.version>2021.0.4.0</spring.cloud.alibaba.version><spring.plugin.version>2.0.0.RELEASE</spring.plugin.version><spring-boot-maven-plugin.version>2.4.13</spring-boot-maven-plugin.version><spring-cloud-commons.version>3.1.7</spring-cloud-commons.version><!-- database --><mybatis-spring-boot-starter.verion>2.3.1</mybatis-spring-boot-starter.verion><mybatis-plus-boot-starter.version>3.4.2</mybatis-plus-boot-starter.version><mybatis-plus-join-boot-starter.version>1.4.13</mybatis-plus-join-boot-starter.version><dynamic-datasource.version>3.5.2</dynamic-datasource.version><mysql-connector-java.version>8.0.28</mysql-connector-java.version><!-- others --><alibaba-nacos.version>2.2.9.RELEASE</alibaba-nacos.version><guava.version>33.0.0-jre</guava.version><apache.commons-lang3.version>3.13.0</apache.commons-lang3.version><commons-collections4.version>4.4</commons-collections4.version><fastjson.version>2.0.38</fastjson.version><httpclient.version>4.5.14</httpclient.version><hutool-all.version>5.8.28</hutool-all.version><validation-api.version>2.0.1.Final</validation-api.version><jakarta.validation-api.version>3.0.2</jakarta.validation-api.version><hibernate-validator.version>6.2.0.Final</hibernate-validator.version><caffeine.version>3.1.8</caffeine.version><xxl-job-core.version>2.4.0</xxl-job-core.version><easyexcel.version>2.2.6</easyexcel.version></properties><modules><module>parent-common</module><module>parent-database</module><module>parent-cache</module><module>parent-apidoc</module></modules><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot-dependencies.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud-dependencies.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>${spring.cloud.alibaba.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>${guava.version}</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>${fastjson.version}</version></dependency><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>${httpclient.version}</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>${apache.commons-lang3.version}</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-collections4</artifactId><version>${commons-collections4.version}</version></dependency><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>${hutool-all.version}</version></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><scope>provided</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>javax.validation</groupId><artifactId>validation-api</artifactId></dependency><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId></dependency><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring-boot-maven-plugin.version}</version><configuration><excludes><exclude><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></exclude></excludes></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>${maven.plugin.version}</version><configuration><source>${java.version}</source><target>${java.version}</target><encoding>UTF-8</encoding><compilerArgs><arg>-parameters</arg></compilerArgs></configuration></plugin><plugin><groupId>org.codehaus.mojo</groupId><artifactId>versions-maven-plugin</artifactId><version>${versions-maven-plugin.version}</version><configuration><generateBackupPoms>false</generateBackupPoms></configuration></plugin></plugins><resources><resource><directory>src/main/java</directory><includes><include>**/*.*</include></includes><filtering>true</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**/*.*</include></includes><filtering>true</filtering></resource></resources></build><distributionManagement><repository><id>custom_release</id><url>http://192.168.110.200:8081/repository/custom_release/</url></repository><snapshotRepository><id>custom_snapshot</id><url>http://192.168.110.200:8081/repository/custom_snapshot/</url></snapshotRepository></distributionManagement><repositories><repository><id>custom_group</id><name>custom_group</name><url>http://192.168.110.200:8081/repository/custom_group/</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy><checksumPolicy>fail</checksumPolicy></snapshots></repository></repositories><pluginRepositories><pluginRepository><id>custom_group</id><name>custom_plugin_group</name><url>http://192.168.110.200:8081/repository/custom_group/</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled></snapshots></pluginRepository></pluginRepositories></project>

2、 这个是中间la-server中作为父依赖的pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.lookahead</groupId><artifactId>la-parent</artifactId><version>0.0.4-SNAPSHOT</version><relativePath/> <!-- lookup parent from repository 指定依赖的父项目在远程仓库中--></parent><artifactId>la-server</artifactId><version>1.0-SNAPSHOT</version><packaging>pom</packaging><name>la-server</name><url>http://maven.apache.org</url><modules><module>api</module><module>la-sys</module><module>la-order</module><module>la-resource</module><module>la-product</module><module>la-convert</module></modules><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><spring-boot-maven-plugin.version>2.4.13</spring-boot-maven-plugin.version><captcha.version>1.6.2</captcha.version></properties><distributionManagement><repository><id>custom_release</id><url>http://192.168.110.200:8081/repository/custom_release/</url></repository><snapshotRepository><id>custom_snapshot</id><url>http://192.168.110.200:8081/repository/custom_snapshot/</url></snapshotRepository></distributionManagement><repositories><repository><id>custom_group</id><name>custom_group</name><url>http://192.168.110.200:8081/repository/custom_group/</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy><checksumPolicy>fail</checksumPolicy></snapshots></repository></repositories><pluginRepositories><pluginRepository><id>custom_group</id><name>custom_plugin_group</name><url>http://192.168.110.200:8081/repository/custom_group/</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled></snapshots></pluginRepository></pluginRepositories></project>

3、这个是api依赖

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.lookahead</groupId><artifactId>la-server</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>api</artifactId><packaging>jar</packaging><version>1.0-SNAPSHOT</version><name>api</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><scope>provided</scope></dependency><!-- api doc --><dependency><groupId>org.lookahead</groupId><artifactId>parent-apidoc</artifactId><version>0.0.4-SNAPSHOT</version></dependency><!--小工具--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId></dependency><!--xml解析--><dependency><groupId>com.fasterxml.jackson.dataformat</groupId><artifactId>jackson-dataformat-xml</artifactId><version>2.11.1</version></dependency><!--excel，api包中引入了easyexcel依赖，但是没有直接指定版本号，他依赖于父项目la-server，但是la-server中也没有版本号管理，依赖于在上一层la-parent，但是la-server和la-parent不在一个项目下，所以la-server的parent标签中要有指定依赖的父项目在远程仓库中--><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>${easyexcel.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency></dependencies>
</project>

4、这个是使用easyexcel的项目依赖，可以看到这里没有直接引入easyexcel，而是通过api包引入的

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.lookahead</groupId><artifactId>la-server</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>la-sys</artifactId><packaging>jar</packaging><version>1.0-SNAPSHOT</version><name>la-sys</name><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><commons-io.version>2.16.1</commons-io.version></properties><dependencies><dependency><groupId>org.lookahead</groupId><artifactId>api</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>org.lookahead</groupId><artifactId>parent-cache</artifactId><version>0.0.4-SNAPSHOT</version></dependency><dependency><groupId>org.lookahead</groupId><artifactId>parent-database</artifactId><version>0.0.4-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bootstrap</artifactId><version>4.0.4</version></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId></dependency><!-- xxl-job-core --><dependency><groupId>com.xuxueli</groupId><artifactId>xxl-job-core</artifactId><version>${xxl-job-core.version}</version></dependency><!-- 解决多网卡问题 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-commons</artifactId><version>${spring-cloud-commons.version}</version></dependency><!-- Captcha --><dependency><groupId>com.github.whvcse</groupId><artifactId>easy-captcha</artifactId><version>${captcha.version}</version></dependency><!--aliyun-api--><dependency><groupId>com.aliyun.oss</groupId><artifactId>aliyun-sdk-oss</artifactId><version>3.17.1</version></dependency><dependency><groupId>com.aliyun</groupId><artifactId>dysmsapi20170525</artifactId><version>2.0.23</version></dependency><dependency><groupId>com.aliyun</groupId><artifactId>tea-openapi</artifactId><version>0.2.8</version><scope>compile</scope></dependency><!--WEB--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>${commons-io.version}</version></dependency><!-- 第三方登陆 --><dependency><groupId>me.zhyd.oauth</groupId><artifactId>JustAuth</artifactId><version>1.15.8</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency></dependencies><repositories><repository><id>custom_group</id><name>custom_group</name><url>http://192.168.110.200:8081/repository/custom_group/</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy><checksumPolicy>fail</checksumPolicy></snapshots></repository></repositories><pluginRepositories><pluginRepository><id>custom_group</id><name>custom_plugin_group</name><url>http://192.168.110.200:8081/repository/custom_group/</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled></snapshots></pluginRepository></pluginRepositories><build><finalName>${project.artifactId}</finalName><resources><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes><filtering>true</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**.*</include></includes></resource></resources><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring-boot-maven-plugin.version}</version><configuration><mainClass>org.lookahead.sys.LaSysApplication</mainClass></configuration><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-antrun-plugin</artifactId><version>1.3</version><executions><execution><phase>package</phase><goals><goal>run</goal></goals><configuration><tasks><!--suppress UnresolvedMavenProperty --><copy overwrite="true"tofile="${session.executionRootDirectory}/target/${project.name}.jar"file="${project.build.directory}/${project.artifactId}.jar" /></tasks></configuration></execution></executions></plugin></plugins></build></project>

la-parent（la-parent只有版本管理，一些工具类、common包等）
la-server（没有版本号管理，依赖于parent，<relativePath/>）la-api（引入了easyexcel，没有指定版本号）la-sys(使用了easyexcel，引入了la-api)

依赖的父项目la-parent在远程仓库中
注意：
1、当你没有设置 ，并且父项目并不在远程仓库中时，Maven 无法找到父项目的 pom.xml 文件。此时，依赖关系和插件继承都将无法生效。

如果父项目发布在私有仓库或中央仓库中，则 可以为空，这样 Maven 会直接从仓库中下载父项目的 pom.xml。但如果父项目没有发布到仓库中，并且没有指定正确的相对路径，那么子项目将无法解析父项目的配置。
2、如果不写，默认…/pom.xml。
3、可以指定路径。