package com.vvv.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.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.NodeList;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;
public class Struts {
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。
*/
File file = new File("src/com/vvv/litestruts/struts.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
try {
dBuilder = dbFactory.newDocumentBuilder();
Document doc = (Document) dBuilder.parse(file);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("action");
int nodeLen = nodeList.getLength();
for (int i = 0; i < nodeLen; i++) {
Element element = (Element) nodeList.item(i);
if (element.getAttribute("name").contentEquals(actionName)) {
Class <?> c = Class.forName(element.getAttribute("class").replace("action", "litestruts"));
Object obj = c.getConstructor().newInstance();
Method setName = c.getMethod("setName", String.class);
Method setPwd = c.getMethod("setPassword", String.class);
c.getMethod("getName");
c.getMethod("getPassword");
Method getMsg = c.getMethod("getMessage");
Method execute = c.getMethod("execute");
setName.invoke(obj, parameters.get("name"));
setPwd.invoke(obj, parameters.get("password"));
String result = (String)execute.invoke(obj);
String message = (String)getMsg.invoke(obj);
NodeList resultList = element.getElementsByTagName("result");
for (int j = 0; j < resultList.getLength(); j++) {
Element resultE = (Element)resultList.item(j);
if (resultE.getAttribute("name").contentEquals(result)) {
HashMap<String, String> params = new HashMap<String, String>();
View retView = new View();
retView.setJsp(resultE.getTextContent());
params.put("message", message);
retView.setParameters(params);
return retView;
}
}
break;
}
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException 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();
} catch (InstantiationException e) {
e.printStackTrace();
}
return null;
}
}