package com.coderising.litestruts;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class Struts {
public static View runAction(String actionName, Map<String,String> parameters) {
View view = new View();
/*
* 0. 读取配置文件struts.xml
* */
SAXReader reader = new SAXReader();
try {
Document document = reader.read(new File("src/com/coderising/litestruts/struts.xml")); //re:创建一个java类来接收
Element root = document.getRootElement();
Iterator iter = root.elementIterator();
while(iter.hasNext()){
Element secondNode = (Element) iter.next();
String nameStr = secondNode.attributeValue("name");
String classStr = secondNode.attributeValue("class");
/*
* 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
*/
if(nameStr.equals(actionName)){
Class<?> cls = Class.forName(classStr);
Object obj = cls.newInstance();
Method mtd1 = cls.getDeclaredMethod("setName", String.class);
mtd1.invoke(obj, parameters.get("name"));
Method mtd2 = cls.getDeclaredMethod("setPassword", new Class[]{String.class});
mtd2.invoke(obj, parameters.get("password"));
/*
* 2. 通过反射调用对象的exectue 方法, 并获得返回值,例如"success"
* */
Method execute = cls.getDeclaredMethod("execute");
String runStatus = (String) execute.invoke(obj);
/*
* 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
*/
Method mtd3 = cls.getDeclaredMethod("getMessage");
String getMes = (String) mtd3.invoke(obj);
Map<String,String> params = new HashMap<String,String>();
params.put("message",getMes);
/*
* 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。
*/
Iterator iterSecond = secondNode.elementIterator();
while(iterSecond.hasNext()){
Element thirdNode = (Element) iterSecond.next();
String resultNameStr = thirdNode.attributeValue("name");
String pageStr = thirdNode.getText();
if(runStatus.equals(resultNameStr)){
view.setJsp(pageStr);
view.setParameters(params);
break;
}
}
}
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (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 view;
}
}