添加 apache 模块到项目中，Apache 应该需要单独设置模块，因为 Apache 的内容通常还是比较多的

.idea/compiler.xml

@@ -35,6 +35,7 @@
         <module name="core-java-collections-list-2" />
         <module name="core-java-collections-conversions-2" />
         <module name="core-java-8" />
+        <module name="apache-httpclient" />
         <module name="core-java-collections-3" />
         <module name="core-java-9" />
         <module name="core-java-collections-2" />

.idea/encodings.xml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/apache/apache-httpclient/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/apache/apache-httpclient/src/main/resources" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/apache/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/apache/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/core-java-10/src/main/java" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/core-java-10/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/core-java-11-2/src/main/java" charset="UTF-8" />

.idea/jpa.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JpaBuddyIdeaProjectConfig">
+    <option name="defaultUnitInitialized" value="true" />
+    <option name="renamerInitialized" value="true" />
+  </component>
+</project>

apache/README.md

@@ -0,0 +1,4 @@
+## Apache 模块
+
+Apache 软件基金会是对 Java 开源包中贡献非常大的，很多优秀的代码都能够在 Apache 的开源包中找到。
+

apache/pom.xml

@@ -0,0 +1,45 @@
+<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.ossez.apache</groupId>
+    <artifactId>apache</artifactId>
+    <name>apache-modules</name>
+    <packaging>pom</packaging>
+
+    <parent>
+        <groupId>com.ossez</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>0.0.2-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <modules>
+        <module>apache-httpclient</module>
+    </modules>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>junit</groupId>
+                <artifactId>junit</artifactId>
+                <version>${junit4.version}</version>
+                <scope>test</scope>
+            </dependency>
+
+            <dependency>
+                <groupId>org.junit.jupiter</groupId>
+                <artifactId>junit-jupiter</artifactId>
+                <version>${junit-jupiter.version}</version>
+                <scope>test</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.junit.vintage</groupId>
+                <artifactId>junit-vintage-engine</artifactId>
+                <version>${junit-jupiter.version}</version>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+</project>

pom.xml

@@ -39,6 +39,7 @@
     </licenses>
 
     <modules>
+        <module>apache</module>
         <module>core-java-modules</module>
         <module>image-compressing</module>
         <module>image-processing</module>