package tong.java.two.struts;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class Struts {
private static Root strutsRoot;
private static Action action = null;
public static View runAction(String actionName,
Map<String, String> parameters) {
View view = new View();
/*
* 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。
*/
//读取配置文件
strutsRoot = readStruts();
for (Action a : strutsRoot.getAction()) {
if (actionName.contains(a.getName())) {
action = a;
}
}
if (action != null) {
try {
if (action.getName().equals("login")) {
//通过反射生成LoginAction实例
LoginAction loginAction = (LoginAction) Class.forName(
action.getClassName()).newInstance();
loginAction.setName(parameters.get("name"));
loginAction.setPassword(parameters.get("password"));
//通过反射,执行execute方法
Method method = LoginAction.class.getMethod("execute", null);//
String result = (String) method.invoke(loginAction, null);
HashMap<String, String> params = new HashMap();
params.put("message", loginAction.getMessage());
view.setParameters(params);
for (Result r : action.getResults()) {
if (result.equals(r.getName())) {
view.setJsp(r.getPage());
}
}
}
} 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;
}
private static Root readStruts() {
SAXReader reader = new SAXReader();
try {
Document document = reader.read(new File(
"/tong/java/two/struts/struts.xml"));
Root strutsRoot = new Root();
Element root = document.getRootElement();
ArrayList<Action> actionList = new ArrayList<Action>();
List<Element> elements = root.elements("action");
for (Element e : elements) {
Action action = new Action();
action.setName(e.attributeValue("name"));
action.setClassName(e.attributeValue("class"));
List<Element> results = e.elements("result");
ArrayList<Result> resultList = new ArrayList<Result>();
for (Element e_result : results) {
Result result = new Result();
result.setName(e_result.attributeValue("name"));
result.setPage(e_result.getTextTrim());
resultList.add(result);
}
action.setResults(resultList);
actionList.add(action);
}
strutsRoot.setAction(actionList);
return strutsRoot;
} catch (DocumentException e) {
throw new RuntimeException();
}
}
}