package com.coderising.litestruts;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.xml.parsers.ParserConfigurationException;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.junit.Test;
import org.omg.PortableInterceptor.ObjectIdHelper;
import org.xml.sax.SAXException;
import com.coding.basic.ArrayList;
import com.sun.org.apache.bcel.internal.generic.IF_ACMPEQ;
public class Struts {
@Test
public static View runAction(String actionName,
Map<String, String> parameters) {
/*
*
* 0. 读取配置文件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
*
* 2. 通过反射调用对象的exectue 方法, 并获得返回值,例如"success"
*
* 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
*
* 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。
*/
// DOM4J方式解析xml
// 读取文件 转换成Document
View view = new View();
if (actionName == null || actionName.isEmpty()) {
return view;
}
try {
//获取action标签元素
Element actionEle = getActionElement(actionName);
String qualifiedName = actionEle.attributeValue("class");
Class<?> clazz = Class.forName(qualifiedName);
Object instanceOfAction = getParameteredInstance(parameters, clazz);
Method executeMethod = clazz.getMethod("execute");
//调用execute方法,改变action实例,一定要在执行getResultMap方法之前执行
String executeResult = (String) executeMethod.invoke(instanceOfAction);
Method[] methods = clazz.getMethods();
Map<?, ?> resultMap = getResultMap(instanceOfAction, methods);
view.setParameters(resultMap);
List<Element> resultEles = actionEle.elements("result");
String jspPath = getJspPath(executeResult, resultEles);
view.setJsp(jspPath);
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return view;
}
private static String getJspPath(String result, List<Element> resultEles) {
for (int i = 0; i < resultEles.size(); i++) {
String text = resultEles.get(i).attributeValue("name");
if (text.equals(result)) {
String jspString = resultEles.get(i).getText();
return jspString;
}
}
return null;
}
private static Map<String, Object> getResultMap(Object obj, Method[] methodsOfObj)
throws IllegalAccessException, InvocationTargetException {
Map<String, Object> resultMap = new HashMap<String, Object>();
Method m;
for (int i = 0; i < methodsOfObj.length; i++) {
if (methodsOfObj[i].getName().startsWith("get")) {
m = methodsOfObj[i];
String methodName = getMethodNameInLowerCase(m);
Object result = m.invoke(obj);
resultMap.put(methodName.substring(3), result);
}
}
return resultMap;
}
private static String getMethodNameInLowerCase(Method m) {
String methodName = m.getName();
StringBuilder sbr = new StringBuilder(methodName);
sbr.setCharAt(3, Character.toLowerCase(sbr.charAt(3)));
methodName = sbr.toString();
return methodName;
}
private static Object getParameteredInstance(Map<String, String> parameters,
Class<?> clazz) {
Object obj = null;
try {
obj = clazz.newInstance();
Map methodsAndParams = new HashMap();
Set<String> keySet = parameters.keySet();
for (String k : keySet) {
String methodName = getMethodNameByProperty(k);
methodsAndParams.put(methodName, parameters.get(k));
Method setter = clazz.getMethod(methodName, parameters.get(k)
.getClass());
setter.invoke(obj, parameters.get(k));
}
} catch (InstantiationException | IllegalAccessException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return obj;
}
private static String getMethodNameByProperty(String k) {
StringBuilder sb = new StringBuilder(k);
sb.setCharAt(0, Character.toUpperCase(sb.charAt(0)));
sb = sb.insert(0, "set");
String method = sb.toString();// 获得方法名
return method;
}
@SuppressWarnings("unchecked")
private static Element getActionElement(String actionName) throws DocumentException {
SAXReader reader = new SAXReader();
Document document = reader.read(new File(
"src/com/coderising/litestruts/struts.xml"));
Element root = document.getRootElement();
List<Element> actNodes = root.elements("action");
Element e = null;
String className;
for (int i = 0; i < actNodes.size(); i++) {
className = actNodes.get(i).attributeValue("name");
if (className != null && className.equals(actionName)) {
e = actNodes.get(i);
break;
}
}
return e;
}
}