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implement Struts by Korben
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‎group20/1107837739/1107837739Learning/lib/dom4j-1.6.1.jar

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‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/LoginAction.java

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package org.korben.coderising.litestruts;
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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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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 void setName(String name) {
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this.name = 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 void setPassword(String password) {
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this.password = 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 String getMessage() {
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return this.message;
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}
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}

‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/Struts.java

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package org.korben.coderising.litestruts;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Objects;
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import org.korben.coderising.litestruts.dom.StrutsAction;
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import org.korben.coderising.litestruts.util.StrutsParser;
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public class Struts {
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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
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* ("name"="test" , "password"="1234") ,
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* 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execute 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）,
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* 通过反射来调用， 把值和属性形成一个HashMap , 例如 {"message": "登录成功"} ,
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* 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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public static View runAction(String actionName, Map<String, String> parameters) {
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Map<String, StrutsAction> actionMap = StrutsParser.doParse();
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StrutsAction action = actionMap.get(actionName);
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if (action == null) {
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System.out.println("couldn't get action: " + actionName + ", return");
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return null;
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}
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try {
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// 通过反射, 创建实例对象
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Class<?> actionClass = Class.forName(action.getActionClassName());
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Object actionObj = actionClass.newInstance();
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// 调用 parameters 中的 set 方法
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for (Map.Entry<String, String> parameterEntry : parameters.entrySet()) {
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Method[] methods = actionClass.getMethods();
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for (Method method : methods) {
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if (method.getName().equalsIgnoreCase("set" + parameterEntry.getKey())) {
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method.invoke(actionObj, parameterEntry.getValue());
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}
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}
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}
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//for (Map.Entry<String, String> parameterEntry : parameters.entrySet()) {
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// for (PropertyDescriptor propertyDescriptor :
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// Introspector.getBeanInfo(actionClass).getPropertyDescriptors()) {
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// if (propertyDescriptor.getDisplayName().equals(parameterEntry.getKey())) {
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// Method writeMethod = propertyDescriptor.getWriteMethod();
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// writeMethod.invoke(actionObj, parameterEntry.getValue());
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// }
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// }
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//}
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// 调用 execute 方法
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Method executeMethod = actionClass.getMethod("execute");
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Object executeResult = executeMethod.invoke(actionObj);
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// 根据 execute 方法的结果, 获取 xml 配置的 jsp 页面
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String jsp = action.getAttributes().get(Objects.toString(executeResult));
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// 调用 get 方法
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Map<String, String> actionFieldMap = new HashMap<>();
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Field[] actionFields = actionClass.getDeclaredFields();
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for (Field actionFiled : actionFields) {
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Method[] methods = actionClass.getMethods();
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for (Method method : methods) {
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if (method.getName().equalsIgnoreCase("get" + actionFiled.getName())) {
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method.invoke(actionObj);
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actionFieldMap.put(actionFiled.getName(), Objects.toString(method.invoke(actionObj)));
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}
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}
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}
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//for (PropertyDescriptor propertyDescriptor :
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// Introspector.getBeanInfo(actionClass).getPropertyDescriptors()) {
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// Method readMethod = propertyDescriptor.getReadMethod();
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// Object readMethodResult = readMethod.invoke(actionObj);
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// actionFieldMap.put(propertyDescriptor.getDisplayName(), Objects.toString(readMethodResult));
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//}
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// 返回 View 对象
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View view = new View();
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view.setParameters(actionFieldMap);
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view.setJsp(jsp);
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return view;
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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} catch (InstantiationException e) {
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e.printStackTrace();
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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} catch (InvocationTargetException e) {
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e.printStackTrace();
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} catch (NoSuchMethodException e) {
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e.printStackTrace();
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}/* catch (IntrospectionException e) {
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e.printStackTrace();
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}*/
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return null;
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}
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}

‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/StrutsTest.java

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package org.korben.coderising.litestruts;
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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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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"); //密码和预设的不一致
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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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}

‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/View.java

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package org.korben.coderising.litestruts;
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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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}

‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/dom/StrutsAction.java

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package org.korben.coderising.litestruts.dom;
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import java.util.Map;
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/**
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* Created by Korben on 03/03/2017.
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*/
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public class StrutsAction {
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private String actionClassName;
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private Map<String, String> attributes;
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public String getActionClassName() {
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return actionClassName;
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}
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public void setActionClassName(String actionClassName) {
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this.actionClassName = actionClassName;
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}
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public Map<String, String> getAttributes() {
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return attributes;
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}
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public void setAttributes(Map<String, String> attributes) {
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this.attributes = attributes;
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}
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}

‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/util/StrutsParser.java

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package org.korben.coderising.litestruts.util;
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import java.io.IOException;
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import java.io.InputStream;
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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.dom4j.Document;
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import org.dom4j.DocumentException;
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import org.dom4j.Element;
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import org.dom4j.io.SAXReader;
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import org.korben.coderising.litestruts.dom.StrutsAction;
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/**
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* 解析struts.xml
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*
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* Created by Korben on 03/03/2017.
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*/
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public class StrutsParser {
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private static final String STRUTS_XML = "struts.xml";
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public static void main(String[] args) {
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Map<String, StrutsAction> strutsActions = doParse();
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System.out.println(strutsActions.size());
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}
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public static Map<String, StrutsAction> doParse() {
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Map<String, StrutsAction> resultMap = new HashMap<>();
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SAXReader reader = new SAXReader();
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InputStream in = getStrutsInputStream();
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try {
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Document document = reader.read(in);
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Element rootElement = document.getRootElement();
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// parse action element
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List<Element> elementActions = rootElement.elements();
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for (Element elementAction : elementActions) {
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StrutsAction action = new StrutsAction();
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// parse "name" attribute from action element
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resultMap.put(elementAction.attribute("name").getValue(), action);
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// parse "class" attribute from action element
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action.setActionClassName(elementAction.attribute("class").getValue());
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// parse sub elements in action element
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List<Element> elements = elementAction.elements();
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Map<String, String> map = new HashMap<>();
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for (Element element : elements) {
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map.put(element.attribute("name").getValue(), element.getStringValue());
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}
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action.setAttributes(map);
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}
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return resultMap;
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} catch (DocumentException e) {
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throw new IllegalStateException("failed to parse " + STRUTS_XML, e);
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} finally {
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if (in != null) {
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try {
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in.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}
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private static InputStream getStrutsInputStream() {
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StrutsParser.class.getPackage().getName();
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InputStream in = StrutsParser.class.getClassLoader()
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.getResourceAsStream("org/korben/coderising/litestruts/util/" + STRUTS_XML);
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if (in == null) {
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throw new IllegalStateException(STRUTS_XML + " doesn't exist");
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}
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return in;
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}
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}

‎group20/1107837739/1107837739Learning/src/org/korben/coderising/litestruts/util/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="org.korben.coderising.litestruts.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="org.korben.coderising.litestruts.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>

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