diff --git a/samples/user/src/main/java/com/supwisdom/leaveschool/user/repository/UserRepository.java b/samples/user/src/main/java/com/supwisdom/leaveschool/user/repository/UserRepository.java
index ff1fd0b..6cef7b8 100644
--- a/samples/user/src/main/java/com/supwisdom/leaveschool/user/repository/UserRepository.java
+++ b/samples/user/src/main/java/com/supwisdom/leaveschool/user/repository/UserRepository.java
@@ -10,6 +10,7 @@
 
 import com.supwisdom.leaveschool.common.repository.BaseJpaRepository;
 import com.supwisdom.leaveschool.user.domain.User;
+import com.supwisdom.leaveschool.user.util.MapBeanUtils;
 
 @Repository
 public interface UserRepository extends BaseJpaRepository<User> {
@@ -17,9 +18,9 @@
   public default Page<User> selectPageList(int pageIndex, int pageSize, Map<String, Object> mapBean) {
     User probe = new User();
     if (mapBean != null) {
-      probe.setUsername(String.valueOf(mapBean.get("username")));
-      probe.setName(String.valueOf(mapBean.get("name")));
-      probe.setStatus(String.valueOf(mapBean.get("status")));
+      probe.setUsername(MapBeanUtils.getString(mapBean, "username"));
+      probe.setName(MapBeanUtils.getString(mapBean, "name"));
+      probe.setStatus(MapBeanUtils.getString(mapBean, "status"));
     }
     
     ExampleMatcher matcher = ExampleMatcher.matching()
diff --git a/samples/user/src/main/java/com/supwisdom/leaveschool/user/util/MapBeanUtils.java b/samples/user/src/main/java/com/supwisdom/leaveschool/user/util/MapBeanUtils.java
new file mode 100644
index 0000000..9643b11
--- /dev/null
+++ b/samples/user/src/main/java/com/supwisdom/leaveschool/user/util/MapBeanUtils.java
@@ -0,0 +1,150 @@
+package com.supwisdom.leaveschool.user.util;
+
+import java.util.Map;
+
+public class MapBeanUtils {
+
+  /**
+   * 判断 mapBean 中的 key 是否存在；若存在，则判断是否有值
+   * 
+   * @param mapBean
+   * @param key
+   * @return
+   */
+  public static boolean containsValue(Map<String, Object> mapBean, String key) {
+
+    if (!mapBean.containsKey(key)) {
+      return false;
+    }
+
+    if (mapBean.get(key) == null) {
+      return false;
+    }
+
+    if (String.valueOf(mapBean.get(key)).isEmpty()) {
+      return false;
+    }
+
+    return true;
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 null
+   * 
+   * @param mapBean
+   * @param key
+   * @return
+   */
+  public static String getString(Map<String, Object> mapBean, String key) {
+
+    return getString(mapBean, key, null);
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 defaultValue
+   * 
+   * @param mapBean
+   * @param key
+   * @param defaultValue
+   * @return
+   */
+  public static String getString(Map<String, Object> mapBean, String key, String defaultValue) {
+
+    if (containsValue(mapBean, key)) {
+      return String.valueOf(mapBean.get(key));
+    }
+
+    return defaultValue;
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 false
+   * 
+   * @param mapBean
+   * @param key
+   * @return
+   */
+  public static boolean getBoolean(Map<String, Object> mapBean, String key) {
+
+    return getBoolean(mapBean, key, false);
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 defaultValue
+   * 
+   * @param mapBean
+   * @param key
+   * @param defaultValue
+   * @return
+   */
+  public static boolean getBoolean(Map<String, Object> mapBean, String key, Boolean defaultValue) {
+
+    if (containsValue(mapBean, key)) {
+      Boolean b = Boolean.valueOf(String.valueOf(mapBean.get(key)));
+      return b == null ? defaultValue : b.booleanValue();
+    }
+
+    return defaultValue;
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 -1
+   * 
+   * @param mapBean
+   * @param key
+   * @return
+   */
+  public static int getInteger(Map<String, Object> mapBean, String key) {
+
+    return getInteger(mapBean, key, -1);
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 defaultValue
+   * 
+   * @param mapBean
+   * @param key
+   * @param defaultValue
+   * @return
+   */
+  public static int getInteger(Map<String, Object> mapBean, String key, Integer defaultValue) {
+
+    if (containsValue(mapBean, key)) {
+      Integer i = Integer.valueOf(String.valueOf(mapBean.get(key)));
+      return i == null ? defaultValue : i.intValue();
+    }
+
+    return defaultValue;
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 -1L
+   * 
+   * @param mapBean
+   * @param key
+   * @return
+   */
+  public static long getLong(Map<String, Object> mapBean, String key) {
+
+    return getLong(mapBean, key, -1L);
+  }
+
+  /**
+   * 获取 mapBean 中 key 的 value，若不存在，则返回 defaultValue
+   * 
+   * @param mapBean
+   * @param key
+   * @param defaultValue
+   * @return
+   */
+  public static long getLong(Map<String, Object> mapBean, String key, Long defaultValue) {
+
+    if (containsValue(mapBean, key)) {
+      Long l = Long.valueOf(String.valueOf(mapBean.get(key)));
+      return l == null ? defaultValue : l.longValue();
+    }
+
+    return defaultValue;
+  }
+
+}