diff --git a/mywust-core/src/main/java/cn/linghang/mywust/core/parser/undergraduate/UndergradStudentInfoPageParser.java b/mywust-core/src/main/java/cn/linghang/mywust/core/parser/undergraduate/UndergradStudentInfoPageParser.java
index 11dc94e..d3c1046 100644
--- a/mywust-core/src/main/java/cn/linghang/mywust/core/parser/undergraduate/UndergradStudentInfoPageParser.java
+++ b/mywust-core/src/main/java/cn/linghang/mywust/core/parser/undergraduate/UndergradStudentInfoPageParser.java
@@ -2,6 +2,7 @@ package cn.linghang.mywust.core.parser.undergraduate;
 
 import cn.linghang.mywust.core.exception.ParseException;
 import cn.linghang.mywust.core.parser.Parser;
+import cn.linghang.mywust.core.util.JsoupUtil;
 import cn.linghang.mywust.model.global.StudentInfo;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
@@ -18,34 +19,34 @@ public class UndergradStudentInfoPageParser implements Parser<StudentInfo> {
         }
 
         Elements studentElements = table.selectXpath(StudentInfoXpath.STUDENT_NUMBER);
-        String studentNumber = studentElements.isEmpty() ? null : studentElements.get(0).text().replace("学号：", "");
+        String studentNumber = JsoupUtil.getElementText(studentElements).replace("学号：", "");
 
         Elements collegeElements = table.selectXpath(StudentInfoXpath.COLLEGE);
-        String college = collegeElements.isEmpty() ? null : collegeElements.get(0).text().replace("院系：", "");
+        String college = JsoupUtil.getElementText(collegeElements).replace("院系：", "");
 
         Elements majorElements = table.selectXpath(StudentInfoXpath.MAJOR);
-        String major = majorElements.isEmpty() ? null : majorElements.get(0).text().replace("专业：", "");
+        String major = JsoupUtil.getElementText(majorElements).replace("专业：", "");
 
         Elements classElements = table.selectXpath(StudentInfoXpath.CLASS);
-        String clazz = classElements.isEmpty() ? null : classElements.get(0).text().replace("班级：", "");
+        String clazz = JsoupUtil.getElementText(classElements).replace("班级：", "");
 
         Elements nameElements = table.selectXpath(StudentInfoXpath.NAME);
-        String name = nameElements.isEmpty() ? null : nameElements.get(0).text();
+        String name = JsoupUtil.getElementText(nameElements);
 
         Elements sexElements = table.selectXpath(StudentInfoXpath.SEX);
-        String sex = sexElements.isEmpty() ? null : sexElements.get(0).text();
+        String sex = JsoupUtil.getElementText(sexElements);
 
         Elements birthdayElements = table.selectXpath(StudentInfoXpath.BIRTHDAY);
-        String birthday = birthdayElements.isEmpty() ? null : birthdayElements.get(0).text();
+        String birthday = JsoupUtil.getElementText(birthdayElements);
 
         Elements hometownElements = table.selectXpath(StudentInfoXpath.HOMETOWN);
-        String hometown = hometownElements.isEmpty() ? null : hometownElements.get(0).text();
+        String hometown = JsoupUtil.getElementText(hometownElements);
 
         Elements nationalityElements = table.selectXpath(StudentInfoXpath.NATIONALITY);
-        String nationality = nationalityElements.isEmpty() ? null : nationalityElements.get(0).text();
+        String nationality = JsoupUtil.getElementText(nationalityElements);
 
         Elements idNumberElements = table.selectXpath(StudentInfoXpath.ID_NUMBER);
-        String idNumber = idNumberElements.isEmpty() ? null : idNumberElements.get(0).text();
+        String idNumber = JsoupUtil.getElementText(idNumberElements);
 
         return StudentInfo.builder()
                 .studentNumber(studentNumber)
diff --git a/mywust-core/src/main/java/cn/linghang/mywust/core/util/JsoupUtil.java b/mywust-core/src/main/java/cn/linghang/mywust/core/util/JsoupUtil.java
index d925470..5be4d50 100644
--- a/mywust-core/src/main/java/cn/linghang/mywust/core/util/JsoupUtil.java
+++ b/mywust-core/src/main/java/cn/linghang/mywust/core/util/JsoupUtil.java
@@ -1,6 +1,7 @@
 package cn.linghang.mywust.core.util;
 
 import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
 
 public class JsoupUtil {
     /**
@@ -61,4 +62,28 @@ public class JsoupUtil {
                     .ownText();
         }
     }
+
+    /**
+     * 取元素集合中第一个元素的文本，当elements为null或数量为0时，返回空字符串
+     *
+     * @param elements 元素集合
+     * @return 第一个元素的文本
+     */
+    public static String getElementText(Elements elements) {
+        return getElementText(elements, 0);
+    }
+
+    /**
+     * 取元素集合中指定索引元素的文本，当elements为null时或index超出集合的大小时，返回空字符串
+     *
+     * @param elements 元素集合
+     * @return 对应索引元素的文本
+     */
+    public static String getElementText(Elements elements, int index) {
+        if (elements == null) {
+            return "";
+        } else {
+            return index >= elements.size() ? "" : elements.get(index).text();
+        }
+    }
 }
diff --git a/mywust-network-okhttp/pom.xml b/mywust-network-okhttp/pom.xml
index cbd8d86..6d29ff2 100644
--- a/mywust-network-okhttp/pom.xml
+++ b/mywust-network-okhttp/pom.xml
@@ -27,22 +27,6 @@
             <version>3.14.9</version>
         </dependency>
 
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-core</artifactId>
-            <version>2.13.4</version>
-        </dependency>
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-            <version>2.14.0-rc1</version>
-        </dependency>
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-annotations</artifactId>
-            <version>2.13.4</version>
-        </dependency>
-
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>