使用的插件：license-maven-plugin。执行命令： mvn clean license:aggregate-add-third-party
参考文章：https://blog.csdn.net/Leo_Steven/article/details/105170894

在maven pom.xml文件中增加如下配置：

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>license-maven-plugin</artifactId>
                <version>2.0.0</version>
                <executions>
                    <execution>
                        <goals>
                            <!-- 该插件有很多种执行目标，比如 license-list 是用来列出可用的 license，add-third-party 用来检测单个项目中的 license -->
                            <!-- aggregate-add-third-party 表示检测多模块项目的 license -->
                            <goal>aggregate-add-third-party</goal>
                        </goals>
                    </execution>
                </executions>
                <!-- 设置配置，以下配置都是非必须的 -->
                <configuration>
                    <!-- 设置检测结果文件的存放目录 -->
                    <outputDirectory>${basedir}/target/generated-sources/license</outputDirectory>
                    <!-- 设置检测结果文件，默认是 txt 文件 -->
                    <thirdPartyFilename>all_license.xls</thirdPartyFilename>
                    <!-- 设置检测结果文件的样式，默认的样式会生成 txt 文件 -->
                    <fileTemplate>${basedir}/src/license/excel_export.ftl</fileTemplate>
                    <!-- mvn 命令会从不同的 repository 中下载 license 文件，经常会出现请求超时的情况，默认超时时间是 5 秒，将其调整为 10 秒 -->
                    <connectionRequestTimeout>10000</connectionRequestTimeout>
                    <connectTimeout>10000</connectTimeout>
                    <socketTimeout>10000</socketTimeout>
                    <!-- 有些依赖可能检测不到 license、mvn 检测出来的 license 有误，或者你需要对某些模块的 license 自己指定，将该配置设置为 true -->
                    <!-- 默认配置在 ${basedir}/src/license/THIRD-PARTY.properties 文件中，稍后进行解释 -->
                    <useMissingFile>true</useMissingFile>
                    <!-- 排除项目中某些 groupId，不对其进行检测，比如自己写的模块，是没必要进行检测的 -->
                    <excludedGroups>io\.leo\.test</excludedGroups>
                    <!-- 由于不同依赖中使用的 license 名称不同，为了便于自己分类管理，可以将 license 进行合并，比如以下将 Apache 系列的 license 都合并为 The Apache Software License -->
                    <licenseMerges>
                        <!-- 第一个为合并之后的 license 名称，之后每个 license 以 | 分隔 -->
                        <licenseMerge>
                            The Apache Software License
                            |Apache
                            |ASF 2.0
                            |Apache v2
                            |The Apache Software License, Version 2.0
                        </licenseMerge>
                        <licenseMerge>
                            BSD License
                            |BSD
                            |BSD-2-Clause
                            |The BSD 3-Clause License
                        </licenseMerge>
                    </licenseMerges>
                    <!-- failIfWarning 配合这两个属性使用 <includedLicenses> <excludedLicenses> -->
                    <!-- <includedLicenses> 表示白名单，license 一定要在这个列表中 -->
                    <!-- <excludedLicenses> 表示黑名单，这个列表中的 license 一定不能出现 -->
                    <!-- failIfWarning 设置为 true，表示 license 不在白名单中、或 license 在黑名单中，将会构建失败。结合这个功能，非常方便看出项目中是否有非法 license -->
                    <failIfWarning>true</failIfWarning>
                </configuration>
            </plugin>
        </plugins>
    </build>

excel_export.ftl：导出excel格式，同时需要将thirdPartyFilename后缀改为.xls

<?xml version="1.0"?>
<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
          xmlns:o="urn:schemas-microsoft-com:office:office"
          xmlns:x="urn:schemas-microsoft-com:office:excel"
          xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
          xmlns:html="http://www.w3.org/TR/REC-html40">
 <DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
  <Author>xiajiafu</Author>
  <LastAuthor>xiajiafu</LastAuthor>
  <Created>2015-06-05T18:19:34Z</Created>
  <LastSaved>2023-04-07T05:40:20Z</LastSaved>
  <Version>16.00</Version>
 </DocumentProperties>
 <OfficeDocumentSettings xmlns="urn:schemas-microsoft-com:office:office">
  <AllowPNG/>
 </OfficeDocumentSettings>
 <ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
  <WindowHeight>15720</WindowHeight>
  <WindowWidth>29040</WindowWidth>
  <WindowTopX>32767</WindowTopX>
  <WindowTopY>32767</WindowTopY>
  <ProtectStructure>False</ProtectStructure>
  <ProtectWindows>False</ProtectWindows>
 </ExcelWorkbook>
 <Styles>
  <Style ss:ID="Default" ss:Name="Normal">
   <Alignment ss:Vertical="Bottom"/>
                                   <Borders/>
                                            <Font ss:FontName="等线" x:CharSet="134" ss:Size="11" ss:Color="#000000"/>
                                                                                                                   <Interior/>
                                                                                                                             <NumberFormat/>
                                                                                                                                           <Protection/>
  </Style>
  <Style ss:ID="s63" ss:Name="超链接">
   <Font ss:FontName="等线" x:CharSet="134" ss:Size="11" ss:Color="#0563C1"
   ss:Underline="Single"/>
  </Style>
  <Style ss:ID="s16">
   <Font ss:FontName="等线" x:CharSet="134" ss:Size="14" ss:Color="#000000"/>
  </Style>
  <Style ss:ID="s66" ss:Parent="s63">
   <Font ss:FontName="等线" x:CharSet="134" ss:Size="14" ss:Color="#0563C1"
   ss:Underline="Single"/>
  </Style>
 </Styles>
 <Worksheet ss:Name="Sheet1">
  <Table ss:ExpandedColumnCount="4" ss:ExpandedRowCount="500" x:FullColumns="1"
         x:FullRows="1" ss:StyleID="s16" ss:DefaultColumnWidth="54"
         ss:DefaultRowHeight="18">
   <Column ss:StyleID="s16" ss:AutoFitWidth="0" ss:Width="231.75"/>
   <Column ss:StyleID="s16" ss:AutoFitWidth="0" ss:Width="168"/>
   <Column ss:StyleID="s16" ss:AutoFitWidth="0" ss:Width="429.75"/>
   <Column ss:StyleID="s16" ss:AutoFitWidth="0" ss:Width="143.25"/>
   <Row>
    <Cell><Data ss:Type="String">Dependency</Data></Cell>
    <Cell><Data ss:Type="String">JAR</Data></Cell>
    <Cell><Data ss:Type="String">License name</Data></Cell>
    <Cell><Data ss:Type="String">License Agreement Url</Data></Cell>
   </Row>
   <#list dependencyMap as e>
    <#assign project = e.getKey()/>
    <#assign licenses = e.getValue()/>
    <#if !licenses?seq_contains('Unknown license')>
     <Row>
      <Cell><Data ss:Type="String">${project.groupId}:${project.artifactId}:${project.version}</Data></Cell>
      <Cell><Data ss:Type="String">${project.artifactId}-${project.version}.jar</Data></Cell>
      <Cell><Data ss:Type="String"><#list licenses as license>${license}<#if (license_has_next)>, </#if></#list></Data></Cell>
      <Cell ss:StyleID="s66" ss:HRef="${project.url}"><Data ss:Type="String">License Agreement</Data></Cell>
     </Row>
    </#if>
   </#list>
  </Table>
  <WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
   <PageSetup>
    <Header x:Margin="0.3"/>
    <Footer x:Margin="0.3"/>
    <PageMargins x:Bottom="0.75" x:Left="0.7" x:Right="0.7" x:Top="0.75"/>
   </PageSetup>
   <Selected/>
   <Panes>
    <Pane>
     <Number>3</Number>
     <ActiveRow>3</ActiveRow>
     <ActiveCol>3</ActiveCol>
    </Pane>
   </Panes>
   <ProtectObjects>False</ProtectObjects>
   <ProtectScenarios>False</ProtectScenarios>
  </WorksheetOptions>
 </Worksheet>
</Workbook>

html_export.ftl：导出html格式，同时将thirdPartyFilename后缀改为.html

<#--获取证书分类-->
<#function licenseFormat licenses>
    <#assign result><#list licenses as license>${license}<#if (license_has_next)>, </#if></#list></#assign>
    <#return result>
</#function>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        table {
            width: 100%;
            border-collapse: collapse;
        }

        table caption {
            font-size: 2em;
            font-weight: bold;
            margin: 1em 0;
        }

        th, td {
            border: 1px solid #999;
            text-align: left;
            padding: 20px 0;
        }

        table thead tr {
            background-color: #008c8c;
            color: #fff;
        }

        table tbody tr:nth-child(odd) {
            background-color: #eee;
        }

        table tbody tr:hover {
            background-color: #ccc;
        }

        table tbody tr td:first-child {
            color: #f40;
        }

        table tfoot tr td {
            text-align: right;
            padding-right: 20px;
        }
    </style>
</head>
<body style="text-align: center;">
<table cellspacing="0" cellpadding="0">
    <thead>
    <tr>
        <td>Dependency</td>
        <td>Jar</td>
        <td>License name</td>
        <td>License Agreement Url</td>
    </tr>
    </thead>
    <tbody>
    <#list dependencyMap as e>
        <#assign project = e.getKey()/>
        <#assign licenses = e.getValue()/>
        <#if !licenses?seq_contains('Unknown license')>
            <tr>
                <td>${project.groupId}:${project.artifactId}:${project.version}</td>
                <td>${project.artifactId}-${project.version}.jar</td>
                <td>${licenseFormat(licenses)}</td>
                <td><a href="${project.url}">License Agreement</a></td>
            </tr>
        </#if>
    </#list>
    </tbody>
</table>
</body>
</html>