diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 4547be7..5f312ad 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,30 +1,30 @@
-<?xml version="1.0" encoding="UTF-8"?>
+This XML file does not appear to have any style information associated with it. The document tree is shown below.
 <project version="4">
   <component name="AutoImportSettings">
-    <option name="autoReloadType" value="ALL" />
+    <option name="autoReloadType" value="ALL"/>
   </component>
   <component name="ChangeListManager">
     <list default="true" id="a7505764-040b-48e2-b2fc-8c5b579e595f" name="Default" comment="">
-      <change afterPath="$PROJECT_DIR$/.idea/jarRepositories.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.idea/encodings.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/encodings.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionAggrStat.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionAggrStat.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionDetail.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionDetail.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionRandomExtract.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionRandomExtract.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Task.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Task.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10Category.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10Category.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/jarRepositories.xml" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/.idea/encodings.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/encodings.xml" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionAggrStat.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionAggrStat.java" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionDetail.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionDetail.java" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionRandomExtract.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionRandomExtract.java" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Task.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Task.java" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10Category.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10Category.java" afterDir="false"/>
+      <change beforePath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java" afterDir="false"/>
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-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
+    <option name="SHOW_DIALOG" value="false"/>
+    <option name="HIGHLIGHT_CONFLICTS" value="true"/>
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false"/>
+    <option name="LAST_RESOLUTION" value="IGNORE"/>
   </component>
   <component name="FileTemplateManagerImpl">
     <option name="RECENT_TEMPLATES">
       <list>
-        <option value="Interface" />
-        <option value="Class" />
+        <option value="Interface"/>
+        <option value="Class"/>
       </list>
     </option>
   </component>
@@ -38,72 +38,72 @@
   <component name="Git.Settings">
     <option name="RECENT_BRANCH_BY_REPOSITORY">
       <map>
-        <entry key="$PROJECT_DIR$" value="main" />
+        <entry key="$PROJECT_DIR$" value="main"/>
       </map>
     </option>
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$"/>
   </component>
   <component name="GradleLocalSettings">
     <option name="externalProjectsViewState">
-      <projects_view />
+      <projects_view/>
     </option>
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-        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/until/DateUtils.java" />
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-        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java" />
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-        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/Top10CategorySessionDaoImpl.java" />
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-        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/session/UserVisitAnalyze.java" />
-        <option value="$PROJECT_DIR$/README.md" />
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/until/DateUtils.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/util/NumberUtils.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/conf/ConfigurationManagerTest.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/demo/Singleton.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/jdbc/JDBCHelper.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/jdbc/JDBCHelperTest.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/TaskDao.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/dao/dao.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/json/FastJsonTest.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/conf/ConfigurationManager.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/mockData/MockData.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Task.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/util/StringUtils.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/dao/TaskDaoTest.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/TaskDaoImpl.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/util/ParamUtils.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/utils/ParamUtilsTest.java"/>
+        <option value="$PROJECT_DIR$/pom.xml"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionAggrStat.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/dao/SessionAggrDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/util/DateUtils.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/session/SessionAggrStatAccumulator.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionRadomExtract.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/SessionRadomExtractDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionRandomExtract.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/SessionRandomExtractDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/SessionRandomExtractDaoImpl.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/SessionDetailDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionDetail.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/dao/SessionDetailTest.java"/>
+        <option value="$PROJECT_DIR$/src/test/java/cn/edu/hust/dao/SessionRandomExtractDaoTest.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/SessionDetailDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/SessionDetailDaoImpl.java"/>
+        <option value="$PROJECT_DIR$/src/main/resources/conf.properties"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/constant/Constants.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/session/CategorySort.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10Category.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/Top10CategoryDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/session/CategorySortKey.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/Top10CategoryDaoImpl.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/SessionAggrStatDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/SessionAggrStatDaoImpl.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/Top10CategorySessionDao.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/Top10CategorySessionDaoImpl.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/factory/DaoFactory.java"/>
+        <option value="$PROJECT_DIR$/src/main/java/cn/edu/hust/session/UserVisitAnalyze.java"/>
+        <option value="$PROJECT_DIR$/README.md"/>
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-  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
-  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
+  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER"/>
+  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER"/>
   <component name="JsGulpfileManager">
     <detection-done>true</detection-done>
     <sorting>DEFINITION_ORDER</sorting>
@@ -111,26 +111,26 @@
   <component name="MavenImportPreferences">
     <option name="generalSettings">
       <MavenGeneralSettings>
-        <option name="pluginUpdatePolicy" value="UPDATE" />
+        <option name="pluginUpdatePolicy" value="UPDATE"/>
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   </component>
   <component name="MavenRunner">
-    <option name="jreName" value="#JAVA_INTERNAL" />
-    <option name="vmOptions" value="-DarchetypeCatalog=internal" />
+    <option name="jreName" value="#JAVA_INTERNAL"/>
+    <option name="vmOptions" value="-DarchetypeCatalog=internal"/>
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   <component name="ProjectFrameBounds" extendedState="6" fullScreen="true">
-    <option name="y" value="23" />
-    <option name="width" value="1440" />
-    <option name="height" value="873" />
+    <option name="y" value="23"/>
+    <option name="width" value="1440"/>
+    <option name="height" value="873"/>
   </component>
-  <component name="ProjectId" id="2qO7KjwHuykNsd7iKBmSmBKHPRX" />
+  <component name="ProjectId" id="2qO7KjwHuykNsd7iKBmSmBKHPRX"/>
   <component name="ProjectInspectionProfilesVisibleTreeState">
     <entry key="Project Default">
       <profile-state>
         <expanded-state>
           <State>
-            <id />
+            <id/>
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           <State>
             <id>CodeSpring CoreSpring</id>
@@ -150,521 +150,521 @@
       </profile-state>
     </entry>
   </component>
-  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true"/>
   <component name="ProjectView">
     <navigator currentView="ProjectPane" proportions="" version="1">
-      <flattenPackages />
-      <showMembers />
-      <showModules />
-      <showLibraryContents />
-      <hideEmptyPackages />
-      <abbreviatePackageNames />
-      <autoscrollToSource />
-      <autoscrollFromSource />
-      <sortByType />
-      <manualOrder />
-      <foldersAlwaysOnTop value="true" />
+      <flattenPackages/>
+      <showMembers/>
+      <showModules/>
+      <showLibraryContents/>
+      <hideEmptyPackages/>
+      <abbreviatePackageNames/>
+      <autoscrollToSource/>
+      <autoscrollFromSource/>
+      <sortByType/>
+      <manualOrder/>
+      <foldersAlwaysOnTop value="true"/>
     </navigator>
     <panes>
-      <pane id="PackagesPane" />
-      <pane id="Scratches" />
+      <pane id="PackagesPane"/>
+      <pane id="Scratches"/>
       <pane id="ProjectPane">
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             <path>
-              <item name="UserActionAnalyzePlatform" type="b2602c69:ProjectViewProjectNode" />
-              <item name="UserActionAnalyzePlatform" type="462c0819:PsiDirectoryNode" />
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-              <item name="main" type="462c0819:PsiDirectoryNode" />
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+              <item name="UserActionAnalyzePlatform" type="b2602c69:ProjectViewProjectNode"/>
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-              <item name="hust" type="462c0819:PsiDirectoryNode" />
+              <item name="UserActionAnalyzePlatform" type="b2602c69:ProjectViewProjectNode"/>
+              <item name="UserActionAnalyzePlatform" type="462c0819:PsiDirectoryNode"/>
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-          <caret line="8" column="58" lean-forward="false" selection-start-line="8" selection-start-column="58" selection-end-line="8" selection-end-column="58" />
+          <caret line="8" column="58" lean-forward="false" selection-start-line="8" selection-start-column="58" selection-end-line="8" selection-end-column="58"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10Category.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="38">
-          <caret line="2" column="27" lean-forward="false" selection-start-line="2" selection-start-column="27" selection-end-line="2" selection-end-column="27" />
+          <caret line="2" column="27" lean-forward="false" selection-start-line="2" selection-start-column="27" selection-end-line="2" selection-end-column="27"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/session/CategorySortKey.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="19">
-          <caret line="2" column="0" lean-forward="true" selection-start-line="2" selection-start-column="0" selection-end-line="2" selection-end-column="0" />
+          <caret line="2" column="0" lean-forward="true" selection-start-line="2" selection-start-column="0" selection-end-line="2" selection-end-column="0"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/jdbc/JDBCHelper.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="176">
-          <caret line="169" column="0" lean-forward="false" selection-start-line="169" selection-start-column="0" selection-end-line="169" selection-end-column="0" />
+          <caret line="169" column="0" lean-forward="false" selection-start-line="169" selection-start-column="0" selection-end-line="169" selection-end-column="0"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/Top10CategoryDaoImpl.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="478">
-          <caret line="27" column="76" lean-forward="false" selection-start-line="27" selection-start-column="76" selection-end-line="27" selection-end-column="76" />
+          <caret line="27" column="76" lean-forward="false" selection-start-line="27" selection-start-column="76" selection-end-line="27" selection-end-column="76"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/SessionAggrStat.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="443">
-          <caret line="114" column="27" lean-forward="false" selection-start-line="114" selection-start-column="27" selection-end-line="114" selection-end-column="27" />
+          <caret line="114" column="27" lean-forward="false" selection-start-line="114" selection-start-column="27" selection-end-line="114" selection-end-column="27"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/SessionAggrStatDao.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="114">
-          <caret line="9" column="42" lean-forward="false" selection-start-line="9" selection-start-column="42" selection-end-line="9" selection-end-column="42" />
+          <caret line="9" column="42" lean-forward="false" selection-start-line="9" selection-start-column="42" selection-end-line="9" selection-end-column="42"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/SessionAggrStatDaoImpl.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="592">
-          <caret line="40" column="60" lean-forward="false" selection-start-line="40" selection-start-column="60" selection-end-line="40" selection-end-column="60" />
+          <caret line="40" column="60" lean-forward="false" selection-start-line="40" selection-start-column="60" selection-end-line="40" selection-end-column="60"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/session/SessionAggrStatAccumulator.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="588">
-          <caret line="41" column="46" lean-forward="true" selection-start-line="41" selection-start-column="46" selection-end-line="41" selection-end-column="46" />
-          <folding />
+          <caret line="41" column="46" lean-forward="true" selection-start-line="41" selection-start-column="46" selection-end-line="41" selection-end-column="46"/>
+          <folding/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/util/DateUtils.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="266">
-          <caret line="90" column="25" lean-forward="false" selection-start-line="90" selection-start-column="25" selection-end-line="90" selection-end-column="25" />
-          <folding />
+          <caret line="90" column="25" lean-forward="false" selection-start-line="90" selection-start-column="25" selection-end-line="90" selection-end-column="25"/>
+          <folding/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/Top10CategorySessionDao.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="133">
-          <caret line="7" column="47" lean-forward="false" selection-start-line="7" selection-start-column="47" selection-end-line="7" selection-end-column="47" />
+          <caret line="7" column="47" lean-forward="false" selection-start-line="7" selection-start-column="47" selection-end-line="7" selection-end-column="47"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/impl/Top10CategorySessionDaoImpl.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="399">
-          <caret line="21" column="60" lean-forward="false" selection-start-line="21" selection-start-column="60" selection-end-line="21" selection-end-column="60" />
+          <caret line="21" column="60" lean-forward="false" selection-start-line="21" selection-start-column="60" selection-end-line="21" selection-end-column="60"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/dao/factory/DaoFactory.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="342">
-          <caret line="32" column="4" lean-forward="false" selection-start-line="32" selection-start-column="4" selection-end-line="32" selection-end-column="4" />
-          <folding />
+          <caret line="32" column="4" lean-forward="false" selection-start-line="32" selection-start-column="4" selection-end-line="32" selection-end-column="4"/>
+          <folding/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/domain/Top10CategorySession.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="38">
-          <caret line="4" column="57" lean-forward="false" selection-start-line="4" selection-start-column="57" selection-end-line="4" selection-end-column="57" />
+          <caret line="4" column="57" lean-forward="false" selection-start-line="4" selection-start-column="57" selection-end-line="4" selection-end-column="57"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/mockData/MockData.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="1482">
-          <caret line="93" column="50" lean-forward="false" selection-start-line="93" selection-start-column="50" selection-end-line="93" selection-end-column="50" />
-          <folding />
+          <caret line="93" column="50" lean-forward="false" selection-start-line="93" selection-start-column="50" selection-end-line="93" selection-end-column="50"/>
+          <folding/>
         </state>
       </provider>
     </entry>
     <entry file="jar://$MAVEN_REPOSITORY$/org/apache/spark/spark-core_2.10/1.5.1/spark-core_2.10-1.5.1.jar!/org/apache/spark/api/java/JavaRDDLike.class">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="151">
-          <caret line="145" column="0" lean-forward="false" selection-start-line="145" selection-start-column="0" selection-end-line="145" selection-end-column="0" />
+          <caret line="145" column="0" lean-forward="false" selection-start-line="145" selection-start-column="0" selection-end-line="145" selection-end-column="0"/>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/cn/edu/hust/session/UserVisitAnalyze.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="-377">
-          <caret line="972" column="29" lean-forward="false" selection-start-line="972" selection-start-column="29" selection-end-line="972" selection-end-column="29" />
+          <caret line="972" column="29" lean-forward="false" selection-start-line="972" selection-start-column="29" selection-end-line="972" selection-end-column="29"/>
           <folding>
-            <element signature="imports" expanded="true" />
+            <element signature="imports" expanded="true"/>
           </folding>
         </state>
       </provider>
@@ -933,10 +933,10 @@
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="FIRST">
           <first_editor relative-caret-position="703">
-            <caret line="448" column="0" lean-forward="false" selection-start-line="448" selection-start-column="0" selection-end-line="448" selection-end-column="0" />
-            <folding />
+            <caret line="448" column="0" lean-forward="false" selection-start-line="448" selection-start-column="0" selection-end-line="448" selection-end-column="0"/>
+            <folding/>
           </first_editor>
-          <second_editor />
+          <second_editor/>
         </state>
       </provider>
     </entry>
@@ -945,11 +945,11 @@
     <states>
       <state key="ArtifactsStructureConfigurable.UI">
         <settings>
-          <artifact-editor />
+          <artifact-editor/>
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
+                <option value="0.2"/>
               </list>
             </option>
           </splitter-proportions>
@@ -961,7 +961,7 @@
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
+                <option value="0.2"/>
               </list>
             </option>
           </splitter-proportions>
@@ -973,7 +973,7 @@
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
+                <option value="0.2"/>
               </list>
             </option>
           </splitter-proportions>
@@ -985,7 +985,7 @@
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
+                <option value="0.2"/>
               </list>
             </option>
           </splitter-proportions>
@@ -997,8 +997,8 @@
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
-                <option value="0.6" />
+                <option value="0.2"/>
+                <option value="0.6"/>
               </list>
             </option>
           </splitter-proportions>
@@ -1010,7 +1010,7 @@
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
+                <option value="0.2"/>
               </list>
             </option>
           </splitter-proportions>
@@ -1021,7 +1021,7 @@
           <splitter-proportions>
             <option name="proportions">
               <list>
-                <option value="0.2" />
+                <option value="0.2"/>
               </list>
             </option>
           </splitter-proportions>