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Mar 5th Homework
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‎group20/404130810/src/com/coderising/litestruts/Struts.java

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package com.coderising.litestruts;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.w3c.dom.Node;
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import com.coderising.litestruts.utils.StrutsUtil;
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import com.coderising.litestruts.view.View;
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public class Struts {
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public static View runAction(String actionName, Map<String, String> params) {
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/*
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*
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* 0. 读取配置文件struts.xml
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*
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* 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）
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* 据parameters中的数据，调用对象的setter方法， 例如parameters中的数据是 ("name"="test" ,
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* "password"="1234") , 那就应该调用 setName和setPassword方法
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*
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* 2. 通过反射调用对象的exectue 方法， 并获得返回值，例如"success"
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*
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* 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
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* {"message": "登录成功"} , 放到View对象的parameters
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*
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* 4. 根据struts.xml中的 <result> 配置,以及execute的返回值， 确定哪一个jsp，
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* 放到View对象的jsp字段中。
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*
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*/
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View view = new View();
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Node classNode = readActionInConfig(actionName);
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List<String> rtnList = invokeMethod(classNode.getNodeValue(), params);
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String result = rtnList.get(0);
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String msg = rtnList.get(1);
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view.setParameters(buildViewParams(msg));
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view.setJsp(buildViewJsp(result,classNode));
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System.out.println(rtnList);
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return view;
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}
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private static Node readActionInConfig(String actionName) {
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StrutsUtil util = new StrutsUtil();
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return util.invokedAction(actionName);
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}
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private static List<String> invokeMethod(String className, Map<String, String> params) {
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List<String> rtnList = new ArrayList<String>();
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try {
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String name = params.get("name");
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String password = params.get("password");
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// Invoke set method
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Class<?> actionClass = Class.forName(className);
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Method setNameMethod = actionClass.getMethod("setName", String.class);
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Method setPasswordMethod = actionClass.getMethod("setPassword", String.class);
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Object action = actionClass.newInstance();
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setNameMethod.invoke(action, name);
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setPasswordMethod.invoke(action, password);
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// Invoke execute method and add to the return List as first element
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Method executeMethod = actionClass.getMethod("execute");
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rtnList.add(executeMethod.invoke(action).toString());
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// Invoke getMessage method and add to the return List as second element
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Method getMessageMethod = actionClass.getMethod("getMessage");
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rtnList.add(getMessageMethod.invoke(action).toString());
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} catch (Exception e) {
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e.printStackTrace();
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}
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return rtnList;
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}
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private static Map buildViewParams(String msg) {
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Map viewParams = new HashMap();
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viewParams.put("message", msg);
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return viewParams;
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}
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private static String buildViewJsp(String result, Node classNode) {
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for (int i = 0; i < classNode.getChildNodes().getLength(); i++) {
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if(result.equals(classNode.getChildNodes().item(i).getNodeName())){
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return classNode.getChildNodes().item(i).getNodeValue();
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}
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}
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throw new RuntimeException("result Jsp can't be found");
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}
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}

‎group20/404130810/src/com/coderising/litestruts/action/LoginAction.java

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package com.coderising.litestruts.action;
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/**
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* 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。
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*
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* @author liuxin
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*
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*/
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public class LoginAction {
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private String name;
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private String password;
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private String message;
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public String getName() {
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return name;
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}
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public String getPassword() {
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return password;
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}
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public String execute() {
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if ("test".equals(name) && "1234".equals(password)) {
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this.message = "login successful";
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return "success";
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}
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this.message = "login failed,please check your user/pwd";
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return "fail";
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}
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public void setName(String name) {
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this.name = name;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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public String getMessage() {
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return this.message;
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}
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}

‎group20/404130810/src/com/coderising/litestruts/struts.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<struts>
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<action name="login" class="com.coderising.litestruts.action.LoginAction">
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<result name="success">/jsp/homepage.jsp</result>
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<result name="fail">/jsp/showLogin.jsp</result>
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</action>
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<action name="logout" class="com.coderising.litestruts.action.LogoutAction">
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<result name="success">/jsp/welcome.jsp</result>
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<result name="error">/jsp/error.jsp</result>
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</action>
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</struts>

‎group20/404130810/src/com/coderising/litestruts/test/StrutsTest.java

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package com.coderising.litestruts.test;
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import java.util.HashMap;
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import java.util.Map;
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import org.junit.Assert;
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import org.junit.Test;
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import com.coderising.litestruts.Struts;
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import com.coderising.litestruts.view.View;
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public class StrutsTest {
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@Test
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public void testLoginActionSuccess() {
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String actionName = "login";
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Map<String,String> params = new HashMap<String,String>();
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params.put("name","test");
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params.put("password","1234");
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View view = Struts.runAction(actionName,params);
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Assert.assertEquals("/jsp/homepage.jsp", view.getJsp());
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Assert.assertEquals("login successful", view.getParameters().get("message"));
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}
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@Test
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public void testLoginActionFailed() {
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String actionName = "login";
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Map<String,String> params = new HashMap<String,String>();
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params.put("name","test");
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params.put("password","123456"); //ÃÜÂëºÍÔ¤ÉèµÄ²»Ò»ÖÂ
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View view = Struts.runAction(actionName,params);
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Assert.assertEquals("/jsp/showLogin.jsp", view.getJsp());
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Assert.assertEquals("login failed,please check your user/pwd", view.getParameters().get("message"));
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}
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}

‎group20/404130810/src/com/coderising/litestruts/utils/StrutsUtil.java

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package com.coderising.litestruts.utils;
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import java.io.File;
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import java.net.URL;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import org.w3c.dom.Document;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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public class StrutsUtil {
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public final static String CONFIG_PATH = "../struts.xml";
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public final static String CONFIG_NODE_ACTION = "action";
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public final static String CONFIG_ATTR_NAME = "name";
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public final static String CONFIG_ATTR_CLASS = "class";
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public Node invokedAction(String actionName){
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if(null != actionName && !"".equals(actionName)){
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Document doc = generateDoc();
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NodeList nodeList = doc.getElementsByTagName(CONFIG_NODE_ACTION);
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for (int i = 0; i < nodeList.getLength(); i++) {
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String actionNameConfiged = nodeList.item(i).getAttributes().getNamedItem(CONFIG_ATTR_NAME).getNodeValue();
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if(actionName.equals(actionNameConfiged)){
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return nodeList.item(i).getAttributes().getNamedItem(CONFIG_ATTR_CLASS);
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}
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}
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}
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throw new RuntimeException("actionName can't be found");
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}
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public void readXML(){
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Document doc = generateDoc();
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NodeList nodeList = doc.getElementsByTagName("result");
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System.out.println(nodeList.item(0).getParentNode().getAttributes().getNamedItem(CONFIG_ATTR_NAME).getNodeValue());
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System.out.println(nodeList.item(0).getAttributes().getNamedItem(CONFIG_ATTR_NAME).getNodeValue());
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System.out.println(nodeList.item(0).getTextContent());
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System.out.println("Read XML Finished");
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}
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private Document generateDoc(){
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DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
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Document doc = null;
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try {
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DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
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doc = docBuilder.parse (lookupConfigFile());
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} catch (Exception e) {
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e.printStackTrace();
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}
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return doc;
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}
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private File lookupConfigFile(){
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URL url = getClass().getResource(CONFIG_PATH);
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return new File(url.getPath());
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}
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public static void main(String[] args) {
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new StrutsUtil().readXML();
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}
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}

‎group20/404130810/src/com/coderising/litestruts/view/View.java

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package com.coderising.litestruts.view;
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import java.util.Map;
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public class View {
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private String jsp;
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private Map parameters;
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public String getJsp() {
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return jsp;
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}
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public View setJsp(String jsp) {
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this.jsp = jsp;
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return this;
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}
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public Map getParameters() {
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return parameters;
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}
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public View setParameters(Map parameters) {
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this.parameters = parameters;
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return this;
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}
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}

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