part2 -- parsing the configuration file of struts

group17/785396327/3.5/struts/LoginAction.java

@@ -0,0 +1,39 @@
+package struts;
+
+/**
+ * Created by IBM on 2017/3/4.
+ */
+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;
+    }
+}

group17/785396327/3.5/struts/LoginActionTest.java

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+package struts;
+
+import org.dom4j.DocumentException;
+import org.dom4j.Element;
+import org.dom4j.io.SAXReader;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Created by IBM on 2017/3/4.
+ */
+public class LoginActionTest {
+
+    @Test
+    public void fun1() throws DocumentException {
+        InputStream resourceAsStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("struts/struts.xml");
+        SAXReader reader = new SAXReader();
+        Element rootElement = reader.read(resourceAsStream).getRootElement();
+        Element selectedElement = (Element) rootElement.selectSingleNode("//action[@name='login']");
+        System.out.println(selectedElement.attributeValue("class"));
+
+    }
+
+    @Test
+    public void fun2() {
+        Map<String, String> parameters = new HashMap<String, String>();
+        parameters.put("name", "test");
+        parameters.put("password", "1234");
+        View view = Struts.runAction("login", parameters);
+        Assert.assertEquals("/jsp/homepage.jsp", view.getJsp());
+    }
+}

group17/785396327/3.5/struts/Struts.java

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+package struts;
+
+import org.dom4j.Element;
+
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Created by william on 2017/3/4.
+ */
+public class Struts {
+
+
+    public static View runAction(String actionName, Map<String, String> parameters) {
+        Element root = StrutsUtils.getRoot("struts/struts.xml");
+        View view = null;
+        if (root != null) {
+            Element selectedEle = (Element) root.selectSingleNode("//action[@name='" + actionName + "']");
+            if (selectedEle != null) {
+                Class clazz = genClass(selectedEle.attributeValue("class"));
+                Object target = setValue(parameters, clazz);
+                String result;
+                try {
+                    result = (String) clazz.getMethod("execute").invoke(target);
+                } catch (Exception e) {
+                    throw new RuntimeException("invoke execute have some error", e);
+                }
+                Map<String, Object> response = getValue(clazz, target);
+                view = new View();
+                view.setParameters(response);
+                Element selectedResult = (Element) root.selectSingleNode("//action[@name='" + actionName + "']//result[@name='" + result + "']");
+                view.setJsp(selectedResult == null ? null : selectedResult.getText());
+            }
+        }
+        return view;
+    }
+
+
+    private static Class genClass(String className) {
+        Class clazz = null;
+        try {
+            clazz = Class.forName(className);
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        return clazz;
+    }
+
+    private static Object setValue(Map<String, String> parameters, Class clazz) {
+        try {
+            Object target = clazz.newInstance();
+            if (!StrutsUtils.isEmpty(parameters)) {
+                for (Map.Entry<String, String> entry : parameters.entrySet()) {
+                    String key = entry.getKey();
+                    if (!StrutsUtils.isEmpty(key)) {
+                        String setterName = new StringBuilder("set").append(key.substring(0, 1).toUpperCase()).append(key.substring(1, key.length())).toString();
+                        clazz.getMethod(setterName, String.class).invoke(target, entry.getValue());
+                    }
+                }
+            }
+            return target;
+        } catch (Exception e) {
+            throw new RuntimeException("create class instance have some error ", e);
+        }
+    }
+
+    private static Map<String, Object> getValue(Class clazz, Object target) {
+        Map<String, Object> resultsMap = new HashMap<String, Object>();
+        Method[] methods = clazz.getMethods();
+        for (Method method : methods) {
+            String fieldName = method.getName();
+            if (fieldName.startsWith("get") && !fieldName.equals("getClass")) {
+                try {
+                    Object value = method.invoke(target);
+                    resultsMap.put(new StringBuilder(fieldName.substring(3, 4)).append(fieldName.substring(4, fieldName.length())).toString(), value);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return resultsMap;
+    }
+
+
+}

group17/785396327/3.5/struts/StrutsUtils.java

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+package struts;
+
+import org.dom4j.DocumentException;
+import org.dom4j.Element;
+import org.dom4j.io.SAXReader;
+
+import java.io.InputStream;
+
+/**
+ * Created by IBM on 2017/3/4.
+ */
+public class StrutsUtils {
+
+    public static Element getRoot(String filePath) {
+        try {
+            InputStream resourceAsStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(filePath);
+            SAXReader saxReader = new SAXReader();
+            return saxReader.read(resourceAsStream).getRootElement();
+        } catch (DocumentException e) {
+            throw new RuntimeException("初始化文件异常", e);
+        }
+    }
+
+    public static boolean isEmpty(Object obj) {
+        if (obj instanceof String)
+            return obj == null || obj.equals("");
+        else
+            return obj == null;
+    }
+}

group17/785396327/3.5/struts/View.java

@@ -0,0 +1,26 @@
+package struts;
+
+import java.util.Map;
+
+/**
+ * Created by IBM on 2017/3/4.
+ */
+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;
+    }
+}

group17/785396327/3.5/struts/struts.xml

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