package org.le.b;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class Struts {
private static Map<String,ActionBean> actionMap;
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。
*/
if(actionMap == null){
actionMap = strutsXmlSax("struts2.xml");
}
ActionBean actionBean = actionMap.get(actionName);
return processAction(actionBean,parameters);
}
private static View processAction(ActionBean actionBean, Map<String, String> parameters) {
String clazzStr = actionBean.getClazz();
Map<String, String> result = actionBean.getResults();
try {
Class<?> clazz= Class.forName(clazzStr);
Object obj = clazz.newInstance();
for(String key : parameters.keySet()){
String name = "set"+(key.charAt(0)+"").toUpperCase()+key.substring(1);
Method method = clazz.getMethod(name, String.class);
method.invoke(obj, parameters.get(key));
}
Method execute = clazz.getMethod("execute");
String resultStr = (String)execute.invoke(obj);
String resultJsp = result.get(resultStr);
Map<String,Object> pramMap = new HashMap<>();
Method meg = clazz.getMethod("getMessage");
String resultMsg = (String)meg.invoke(obj);
pramMap.put("message", resultMsg);
return new View(resultJsp,pramMap);
} 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;
}
public static Map<String,ActionBean> strutsXmlSax(String path){
DocumentFactory documentFactory = DocumentFactory.getInstance();
SAXReader saxReader = new SAXReader(documentFactory);
Document doc = null;
try {
doc = saxReader.read(path);
} catch (DocumentException e) {
e.printStackTrace();
}
Element rootElement = doc.getRootElement();
Element pack = rootElement.element("package");
List<Element> actions = pack.elements("action");
Map<String,ActionBean> actionMap = new HashMap<>();
for(Element action : actions){
Attribute name = action.attribute("name");
Attribute clazz = action.attribute("class");
List<Element> results = action.elements("result");
Map<String,String> resMap = new HashMap<>();
for(Element result : results){
String key = "success";
String value = result.getTextTrim();
Attribute rname = result.attribute("name");
if(rname != null){
key = rname.getValue();
}
resMap.put(key, value);
}
actionMap.put(name.getValue(), new ActionBean(name.getValue(),clazz.getValue(),resMap));
}
return actionMap;
}
public static class ActionBean{
private String name;
private String clazz;
private Map<String,String> results;
public ActionBean(String name, String clazz, Map<String,String> results) {
this.name = name;
this.clazz = clazz;
this.results = results;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClazz() {
return clazz;
}
public void setClazz(String clazz) {
this.clazz = clazz;
}
public Map<String,String> getResults() {
return results;
}
public void setResults(Map<String,String> results) {
this.results = results;
}
}
}