完成第二次作业

group04/821655640/learning_projects/project_basic_001/pom.xml

@@ -19,7 +19,13 @@
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<version>4.10</version>
-			<scope>test</scope>
 		</dependency>
+
+		<dependency>
+		    <groupId>jaxen</groupId>
+		    <artifactId>jaxen</artifactId>
+		    <version>1.1-beta-7</version>
+		</dependency>
+
 	</dependencies>
 </project>

group04/821655640/learning_projects/project_basic_001/src/main/java/com/coderising/array/ArrayUtil.java

@@ -0,0 +1,228 @@
+package com.coderising.array;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+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
+	 * 11 01    11|
+	 */
+	public void reverseArray(int[] origin){
+		int len = origin.length-1;
+
+		for (int i = 0; i <((0 == len%2) ? len/2 :(len+1)/2) ; i++) {
+			origin[i] = origin[i]^origin[len-i];
+			origin[len-i] = origin[len-i]^origin[i];
+			origin[i] = origin[i]^origin[len-i];
+		}
+	}
+
+	/**
+	 * 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){
+		//get count
+		int count = 0;
+		for (int i : oldArray) {
+			if(0 != i) {
+				count++;
+			}
+		}
+
+		//remove zero
+		int newArray[] = new int[count];
+		int j=0;
+		for (int i : oldArray) {
+			if(0 != i) {
+				newArray[j++] = i;
+			}
+		}
+		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){
+
+		if (null==array1 || null == array2 || 0 == array1.length || 0 == array2.length) {
+			new IllegalArgumentException("参数不允许为空数组!");
+		}
+
+		int i=0,j=0;
+		ArrayList<Integer> mergedList = new ArrayList<Integer>();
+		while (true) {
+			if (j == array2.length-1 || i == array1.length-1) {
+				break;
+			}
+			if (array1[i] < array2[j]) {
+				mergedList.add(array1[i]);
+				i++;
+			}else if (array1[i] > array2[j]) {
+				mergedList.add(array2[j]);
+				j++;
+			}else {
+				mergedList.add(array2[j]);
+				i++;
+				j++;
+			}
+
+		}
+
+		//put the least part of one array into list
+		if (i == array1.length) {
+			for (int k = j; k < array2.length; k++) {
+				mergedList.add(array2[k]);
+			}
+		}else {
+			for (int k = i; k < array1.length; k++) {
+				mergedList.add(array1[k]);
+			}
+		}
+
+		return  arrayListToInteger(mergedList);
+	}
+
+	private Integer[] arrayListToInteger(ArrayList<Integer> arrayList) {
+		Integer tempArray[] = new Integer[arrayList.size()];
+		int i=0;
+		for (Integer integer : arrayList) {
+			tempArray[i++] = integer;
+		}
+
+		return tempArray;
+	}
+	/**
+	 * 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){
+
+		if (null == oldArray || size<= 0) {
+			new IllegalArgumentException("数组为空或者长度非法!!");
+		}
+
+		int newArray[] = new int[oldArray.length + size];
+		System.arraycopy(oldArray, 0, newArray, 0, oldArray.length);
+		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 ( 1 == max ) {
+			return new Integer[0];
+		}
+		ArrayList<Integer> arrayList = new ArrayList<Integer>();
+		arrayList.add(1);
+		arrayList.add(1);
+
+		int i=0,j=1;
+		while (arrayList.get(i)+arrayList.get(j) < max) {
+			arrayList.add(arrayList.get(i)+arrayList.get(j));
+			i++;
+			j++;
+		}
+
+		return arrayListToInteger(arrayList);
+	}
+
+	/**
+	 * 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){
+		ArrayList<Integer> arrayList = new ArrayList<Integer>();
+		boolean isPrimes = true;
+		for (int i = 2; i < max; i++) {
+			isPrimes = true;
+			for (int j = 2; j <= Math.sqrt(i) ; j++) {
+				if (0 == i % j) {
+					isPrimes = false;
+					break;
+				}
+			}
+
+			if (isPrimes) {
+				arrayList.add(i);
+			}
+
+		}
+		return arrayListToInteger(arrayList);
+	}
+
+	/**
+	 * 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){
+		ArrayList<Integer> arrayList = new ArrayList<Integer>();
+		int sum = 0;
+		for (int i = 2; i < max; i++) {
+			sum = 0;
+			//the factor is less than half of a number
+			for (int j = 1; j <= (i+1)/2; j++) {
+				if (0 == i%j) {
+					sum += j;
+				}
+			}
+
+			if (sum == i) {
+				arrayList.add(i);
+			}
+		}
+		return arrayListToInteger(arrayList);
+	}
+
+	/**
+	 * 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 s
+	 * @return
+	 */
+	public String join(int[] array, String seperator){
+		StringBuilder sb = new StringBuilder();
+		for (int i : array) {
+			sb.append(i).append(seperator);
+		}
+
+		sb.deleteCharAt(sb.length()-1);
+		return sb.toString();
+	}
+
+
+}

group04/821655640/learning_projects/project_basic_001/src/main/java/com/coderising/litestruts/LoginAction.java

@@ -0,0 +1,39 @@
+package com.coderising.litestruts;
+
+/**
+ * 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。
+ * @author liuxin
+ *
+ */
+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;
+    }
+}

group04/821655640/learning_projects/project_basic_001/src/main/java/com/coderising/litestruts/Struts.java

@@ -0,0 +1,86 @@
+package com.coderising.litestruts;
+
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.dom4j.Document;
+import org.dom4j.DocumentException;
+import org.dom4j.io.SAXReader;
+
+
+
+public class Struts {
+
+	public static View runAction(String actionName, Map<String,String> parameters)  {
+
+
+		//0. 读取配置文件struts.xml
+    	Document xmlDoc = null;
+    	View view = null;
+ 		try {
+ 			xmlDoc = getXMLDocument("./src/main/java/com/coderising/litestruts/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*/
+
+	 		String classStr = xmlDoc.selectSingleNode("struts/action[@name='"+actionName+"']/@class").getText();
+	 		Class<?> actionClass = Class.forName(classStr);
+	 		Object action = actionClass.newInstance();
+
+	 		Iterator<Map.Entry<String,String>> itr = parameters.entrySet().iterator();
+	 		Entry<String,String> entry = null;
+	 		String key = "";
+	 		String value = "";
+	 		while(itr.hasNext()) {
+	 			entry = itr.next();
+	 			key = entry.getKey();
+	 			value = entry.getValue();
+	 			Method setter = actionClass.getMethod("set"+key.substring(0, 1).toUpperCase()+key.substring(1),String.class);
+	 			setter.invoke(action, value);
+	 		}
+
+
+	//		2. 通过反射调用对象的exectue 方法， 并获得返回值，例如"success"
+			Method exeMethod = actionClass.getMethod("execute");
+			String result = exeMethod.invoke(action).toString();
+//	 		System.out.println(result);
+
+			/*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*/
+
+		 	Map<String,String> viewDataMap = new HashMap<String,String>();
+		 	String methodName = "";
+		 	for (Method md : actionClass.getMethods()) {
+		 		methodName = md.getName();
+				if (methodName.startsWith("get")) {
+					viewDataMap.put(methodName.substring(3, 4).toLowerCase()+methodName.substring(4), md.invoke(action).toString());
+				}
+			}
+
+//		 	System.out.println(viewDataMap);
+
+			/**
+			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。
+	        */
+		 	String jspRet = xmlDoc.selectSingleNode("struts/action[@name='"+actionName+"']/result[@name='"+result+"']").getText();
+		 	view = new View();
+		 	view.setJsp(jspRet);
+		 	view.setParameters(viewDataMap);
+ 		} catch (Exception e) {
+			e.printStackTrace();
+		}
+    	return view;
+    }    
+
+    private static Document getXMLDocument(String filePath) throws DocumentException {
+    	return new SAXReader().read(filePath);
+    }
+
+}

group04/821655640/learning_projects/project_basic_001/src/main/java/com/coderising/litestruts/View.java

@@ -0,0 +1,23 @@
+package com.coderising.litestruts;
+
+import java.util.Map;
+
+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;
+	}
+}