package com.coderising.iterstruts;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class Struts {
@SuppressWarnings("unchecked")
public static View runAction(String actionName, Map<String,String> parameters) {
View view = new View();
Map<String, String> map = new HashMap<>();
// view.setParameters(parameters);
SAXReader reader = new SAXReader();
Document document = null;
try {
document = reader.read("src/com/coderising/iterstruts/struts.xml");
Element rootElement = document.getRootElement();
for(Iterator<Element> iter = rootElement.elementIterator(); iter.hasNext();){
Element element = iter.next();
if ("action".equals(element.getName()) && actionName.equals(element.attributeValue("name"))) {// 找到actionName对应的element
String className = element.attributeValue("class");
Class<?> targetClass = Class.forName(className);
Object instance = targetClass.newInstance();
Set<String> keySet = parameters.keySet();
//setter
for (String key : keySet) {
Character firstLit =Character.toUpperCase(key.charAt(0));
String leftParts = key.substring(1);
String methodName ="set" + firstLit + leftParts;
Method method = targetClass.getMethod(methodName, String.class);
method.invoke(instance, parameters.get(key));
}
Method execute = targetClass.getMethod("execute");
String result = (String) execute.invoke(instance);
Map<String, String> resultMap = new HashMap<>();
for(Iterator<Element> innerIter = element.elementIterator(); innerIter.hasNext() ;){
Element resultElement = innerIter.next();
if(resultElement.getName().equals("result")){
String resultValue = resultElement.attributeValue("name");
String jspPath = resultElement.getStringValue();
resultMap.put(resultValue, jspPath);
}
}
String targetJspPath = resultMap.get(result);
view.setJsp(targetJspPath);
//getter
for (Method method : targetClass.getMethods()) {
if(method.getName().startsWith("get") && method.getReturnType()==String.class) {
System.out.println(method.getName());
String key = method.getName().substring(3);
key = Character.toLowerCase(key.charAt(0)) + key.substring(1);
String value = (String) method.invoke(instance);
map.put(key, value);
}
}
view.setParameters(map);
return view;
}
}
} catch (DocumentException | ClassNotFoundException
| NoSuchMethodException | SecurityException | InstantiationException
| IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
e.printStackTrace();
}
/*
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。
*/
return view;
}
public static void main(String[] args) {
runAction(null, null);
}
}