diff --git a/group13/2729382520/L2/src/io/github/vxzh/struts/ArrayUtil.java b/group13/2729382520/L2/src/io/github/vxzh/struts/ArrayUtil.java
new file mode 100644
index 0000000000..9dbfde48ad
--- /dev/null
+++ b/group13/2729382520/L2/src/io/github/vxzh/struts/ArrayUtil.java
@@ -0,0 +1,218 @@
+package io.github.vxzh.struts;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by vxzh on 28/02/2017.
+ */
+public class ArrayUtil {
+
+    /**
+     * 给定一个整形数组a , 对该数组的值进行置换
+     * 例如： a = [7, 9 , 30, 3]  ,   置换后为 [3, 30, 9,7]
+     * 如果     a = [7, 9, 30, 3, 4] , 置换后为 [4,3, 30 , 9,7]
+     *
+     * @param origin
+     * @return
+     */
+    public void reverseArray(int[] origin) {
+        for (int i = 0; i < (origin.length >> 1); i++) {
+            int temp = origin[i];
+            origin[i] = origin[origin.length - 1 - i];
+            origin[origin.length - 1 - i] = temp;
+        }
+    }
+
+    /**
+     * 现在有如下的一个数组：   int oldArr[]={1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5}
+     * 要求将以上数组中值为0的项去掉，将不为0的值存入一个新的数组，生成的新数组为：
+     * {1,3,4,5,6,6,5,4,7,6,7,5}
+     *
+     * @param oldArray
+     * @return
+     */
+    public int[] removeZero(int[] oldArray) {
+        int count = 0;
+        for (int i = 0; i < oldArray.length; i++) {
+            if (oldArray[i] != 0) {
+                count++;
+            }
+        }
+
+        int[] newArray = new int[count];
+        int j = 0;
+        for (int i = 0; i < oldArray.length; i++) {
+            if (oldArray[i] != 2) {
+                newArray[j] = oldArray[i];
+                j++;
+            }
+        }
+
+        return newArray;
+    }
+
+    /**
+     * 给定两个已经排序好的整形数组， a1和a2 ,  创建一个新的数组a3, 使得a3 包含a1和a2 的所有元素， 并且仍然是有序的
+     * 例如 a1 = [3, 5, 7,8]   a2 = [4, 5, 6,7]    则 a3 为[3,4,5,6,7,8]    , 注意： 已经消除了重复
+     *
+     * @param array1
+     * @param array2
+     * @return
+     */
+    public Integer[] merge(int[] array1, int[] array2) {
+
+        List<Integer> result = new ArrayList<Integer>();
+        int i = 0, j = 0;
+        while (i < array1.length && j < array2.length) {
+            if (i != array1.length - 1 && array1[i] == array1[i + 1]) {
+                i++;
+                continue;
+            }
+            if (j != array2.length - 1 && array2[j] == array2[j + 1]) {
+                j++;
+                continue;
+            }
+            if (array1[i] > array2[j]) {
+                result.add(array2[j++]);
+            } else if (array1[i] < array2[j]) {
+                result.add(array1[i++]);
+            } else if (array1[i] == array2[j]) {
+                result.add(array1[i]);
+                i++;
+                j++;
+            }
+        }
+        while (i < array1.length) {
+            result.add(array1[i++]);
+        }
+        while (j < array2.length) {
+            result.add(array2[j++]);
+        }
+        return result.toArray(new Integer[result.size()]);
+    }
+
+    /**
+     * 把一个已经存满数据的数组 oldArray的容量进行扩展， 扩展后的新数据大小为oldArray.length + size
+     * 注意，老数组的元素在新数组中需要保持
+     * 例如 oldArray = [2,3,6] , size = 3,则返回的新数组为
+     * [2,3,6,0,0,0]
+     *
+     * @param oldArray
+     * @param size
+     * @return
+     */
+    public int[] grow(int[] oldArray, int size) {
+        int[] newArray = new int[oldArray.length + size];
+        for (int i = 0; i < oldArray.length; i++) {
+            newArray[i] = oldArray[i];
+        }
+        return newArray;
+    }
+
+    /**
+     * 斐波那契数列为：1，1，2，3，5，8，13，21......  ，给定一个最大值， 返回小于该值的数列
+     * 例如， max = 15 , 则返回的数组应该为 [1，1，2，3，5，8，13]
+     * max = 1, 则返回空数组 []
+     *
+     * @param max
+     * @return
+     */
+    public Integer[] fibonacci(int max) {
+        if (max <= 1)
+            return new Integer[0];
+        List<Integer> list = new ArrayList<Integer>();
+        list.add(1);
+        list.add(1);
+        int last = 1;
+        int count = list.size();
+        while (last < max) {
+            int x = list.get(count - 1) + list.get(count - 2);
+            list.add(x);
+            count++;
+            last = x;
+        }
+
+        list.remove(count - 1);
+        return list.toArray(new Integer[list.size()]);
+    }
+
+    /**
+     * 返回小于给定最大值max的所有素数数组
+     * 例如max = 23, 返回的数组为[2,3,5,7,11,13,17,19]
+     *
+     * @param max
+     * @return
+     */
+    public Integer[] getPrimes(int max) {
+        List<Integer> list = new ArrayList<Integer>();
+        if (max < 2)
+            return new Integer[0];
+        else if (max == 2)
+            return new Integer[]{2};
+        else {
+            list.add(2);
+            for (int i = 3; i <= max; i += 2) {
+                boolean flag = true;
+                for (int j = 2; j < i; j++) {
+                    if (i % j == 0) {
+                        flag = false;
+                    }
+                }
+                if (flag) {
+                    list.add(i);
+                }
+            }
+            if (list.get(list.size() - 1) >= max)
+                list.remove(list.size() - 1);
+        }
+
+        return list.toArray(new Integer[list.size()]);
+    }
+
+    /**
+     * 所谓“完数”， 是指这个数恰好等于它的因子之和，例如6=1+2+3
+     * 给定一个最大值max， 返回一个数组， 数组中是小于max 的所有完数
+     *
+     * @param max
+     * @return
+     */
+    public Integer[] getPerfectNumbers(int max) {
+        List<Integer> list = new ArrayList<Integer>();
+        for (int i = 1; i <= max; i++) {
+            int sum = 0;
+            for (int j = 1; j < i; j++) {
+                if (i % j == 0) {
+                    sum += j;
+                }
+            }
+            if (sum == i) {
+                System.out.println(i);
+                list.add(i);
+            }
+        }
+
+        return list.toArray(new Integer[list.size()]);
+    }
+
+    /**
+     * 用seperator 把数组 array给连接起来
+     * 例如array= [3,8,9], seperator = "-"
+     * 则返回值为"3-8-9"
+     *
+     * @param array
+     * @param seperator
+     * @return
+     */
+    public String join(int[] array, String seperator) {
+        StringBuilder builder = new StringBuilder();
+        for (int i = 0; i < array.length; i++) {
+            if (i == array.length - 1)
+                builder.append(array[i]);
+            else
+                builder.append(array[i]).append(seperator);
+        }
+        return builder.toString();
+    }
+
+}
diff --git a/group13/2729382520/L2/src/io/github/vxzh/struts/LoginAction.java b/group13/2729382520/L2/src/io/github/vxzh/struts/LoginAction.java
new file mode 100644
index 0000000000..4638552916
--- /dev/null
+++ b/group13/2729382520/L2/src/io/github/vxzh/struts/LoginAction.java
@@ -0,0 +1,40 @@
+package io.github.vxzh.struts;
+
+
+/**
+ * 这是一个用来展示登录的业务类， 其中的用户名和密码都是硬编码的。
+ */
+public class LoginAction {
+    private String name;
+    private String password;
+    private String message;
+
+    public String getName() {
+        return name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String execute() {
+        if ("test".equals(name) && "1234".equals(password)) {
+            this.message = "login successful";
+            return "success";
+        }
+        this.message = "login failed,please check your user/pwd";
+        return "fail";
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getMessage() {
+        return this.message;
+    }
+}
diff --git a/group13/2729382520/L2/src/io/github/vxzh/struts/Struts.java b/group13/2729382520/L2/src/io/github/vxzh/struts/Struts.java
new file mode 100644
index 0000000000..be549e95dd
--- /dev/null
+++ b/group13/2729382520/L2/src/io/github/vxzh/struts/Struts.java
@@ -0,0 +1,98 @@
+package io.github.vxzh.struts;
+
+
+import org.dom4j.Document;
+import org.dom4j.DocumentException;
+import org.dom4j.Element;
+import org.dom4j.io.SAXReader;
+
+import java.io.File;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+/**
+ * Created by vxzh on 28/02/2017.
+ */
+public class Struts {
+
+    public static View runAction(String actionName, Map<String, String> parameters)
+            throws DocumentException, ClassNotFoundException, IllegalAccessException,
+            InstantiationException, NoSuchMethodException, InvocationTargetException {
+
+        Map<String, String> map = parseXML(actionName, "/Users/zzzz/Documents/IdeaProjects/demo/src/io/github/vxzh/struts/struts.xml");
+
+
+        /**
+         * 1. 根据actionName找到相对应的class, 例如LoginAction, 通过反射实例化（创建对象）
+         *    据parameters中的数据，调用对象的setter方法， 例如parameters中的数据是
+         *    ("name"="test" ,"password"="1234") ,那就应该调用setName和setPassword方法
+         */
+        Class clz = Class.forName(map.get(actionName));
+        LoginAction loginAction = (LoginAction) clz.newInstance();
+        Method name = clz.getMethod("setName", String.class);
+        Method password = clz.getMethod("setPassword", String.class);
+        name.invoke(loginAction, parameters.get("name"));
+        password.invoke(loginAction, parameters.get("password"));
+
+        /**
+         * 2. 通过反射调用对象的exectue 方法， 并获得返回值，例如"success"
+         */
+        Method exectue = clz.getMethod("execute");
+        String str = (String) exectue.invoke(loginAction);
+        map.put("returnValue", str);
+
+        /**
+         * 3. 通过反射找到对象的所有getter方法（例如 getMessage）,
+         *    通过反射来调用， 把值和属性形成一个HashMap , 例如 {"message":  "登录成功"} ,
+         *    放到View对象的parameters
+         */
+        Method getMessage = clz.getMethod("getMessage");
+        String message = (String) getMessage.invoke(loginAction);
+        Map<String, String> hashMap = new HashMap<>();
+        hashMap.put("message", message);
+
+
+        /**
+         * 4. 根据struts.xml中的 <result> 配置, 以及execute的返回值, 确定哪一个jsp，
+         *    放到View对象的jsp字段中。
+         */
+        View view = new View();
+        view.setParameters(hashMap);
+        String jsp = map.get(map.get("returnValue"));
+        view.setJsp(jsp);
+        return view;
+    }
+
+    public static Map<String, String> parseXML(String actionName, String path) throws DocumentException {
+        SAXReader saxReader = new SAXReader();
+        File file = new File(path);
+        Document document = saxReader.read(file);
+
+        //获取根节点对象
+        Element root = document.getRootElement();
+        Element actionElement = null;
+        HashMap<String, String> map = new HashMap<>();
+        for (Iterator i = root.elementIterator(); i.hasNext(); ) {
+            Element element = (Element) i.next();
+            String name = element.attributeValue("name");
+            String clazz = element.attributeValue("class");
+            if (actionName.equals(name)) {
+                actionElement = element;
+                map.put(name, clazz);
+            }
+        }
+
+        for (Iterator j = actionElement.elementIterator(); j.hasNext(); ) {
+            Element elem = (Element) j.next();
+            String resultName = elem.attributeValue("name");
+            String jsp = elem.getText();
+            map.put(resultName, jsp);
+        }
+
+        return map;
+    }
+
+}
diff --git a/group13/2729382520/L2/src/io/github/vxzh/struts/StrutsTest.java b/group13/2729382520/L2/src/io/github/vxzh/struts/StrutsTest.java
new file mode 100644
index 0000000000..1c33f3da30
--- /dev/null
+++ b/group13/2729382520/L2/src/io/github/vxzh/struts/StrutsTest.java
@@ -0,0 +1,48 @@
+package io.github.vxzh.struts;
+
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+/**
+ * Created by vxzh on 28/02/2017.
+ */
+public class StrutsTest {
+
+    @Test
+    public void testLoginActionSuccess() {
+
+        String actionName = "login";
+        Map<String, String> params = new HashMap<String, String>();
+        params.put("name", "test");
+        params.put("password", "1234");
+
+        try {
+            View view = Struts.runAction(actionName, params);
+            Assert.assertEquals("/jsp/homepage.jsp", view.getJsp());
+            Assert.assertEquals("login successful", view.getParameters().get("message"));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void testLoginActionFailed() {
+        String actionName = "login";
+        Map<String, String> params = new HashMap<String, String>();
+        params.put("name", "test");
+        params.put("password", "123456"); //密码和预设的不一致
+
+        try {
+            View view = Struts.runAction(actionName, params);
+            Assert.assertEquals("/jsp/showLogin.jsp", view.getJsp());
+            Assert.assertEquals("login failed,please check your user/pwd", view.getParameters().get("message"));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/group13/2729382520/L2/src/io/github/vxzh/struts/View.java b/group13/2729382520/L2/src/io/github/vxzh/struts/View.java
new file mode 100644
index 0000000000..558afc5d0f
--- /dev/null
+++ b/group13/2729382520/L2/src/io/github/vxzh/struts/View.java
@@ -0,0 +1,29 @@
+package io.github.vxzh.struts;
+
+import java.util.Map;
+
+/**
+ * Created by vxzh on 28/02/2017.
+ */
+public class View {
+    private String jsp;
+    private Map parameters;
+
+    public String getJsp() {
+        return jsp;
+    }
+
+    public View setJsp(String jsp) {
+        this.jsp = jsp;
+        return this;
+    }
+
+    public Map getParameters() {
+        return parameters;
+    }
+
+    public View setParameters(Map parameters) {
+        this.parameters = parameters;
+        return this;
+    }
+}
\ No newline at end of file
diff --git a/group13/2729382520/L2/src/io/github/vxzh/struts/struts.xml b/group13/2729382520/L2/src/io/github/vxzh/struts/struts.xml
new file mode 100644
index 0000000000..10c89781dc
--- /dev/null
+++ b/group13/2729382520/L2/src/io/github/vxzh/struts/struts.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<struts>
+    <action name="login" class="io.github.vxzh.struts.LoginAction">
+        <result name="success">/jsp/homepage.jsp</result>
+        <result name="fail">/jsp/showLogin.jsp</result>
+    </action>
+
+    <action name="logout" class="">
+        <result name="success">/jsp/welcome.jsp</result>
+        <result name="error">/jsp/error.jsp</result>
+    </action>
+</struts>
\ No newline at end of file