package com.sl.test20170304.struts;
import java.io.File;
import java.lang.reflect.Field;
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.Element;
import org.dom4j.io.SAXReader;
import org.junit.Test;
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。
*/
SAXReader reader = new SAXReader();
Object viewObj = null;
try {
Document document = reader.read(new File("E://java开发环境"
+ "//java学习资料//java//java program//Coding2017//src//"
+ "com//sl//test20170304//struts//struts.xml"));
Element node = document.getRootElement();
List<Element> actionList = node.elements("action");
Element temp = null;
for(Element action : actionList){
Attribute nameAttr = action.attribute("name");
if(nameAttr.getText().equals(actionName)){
temp = action;
break;
}
}
Class actionClass = Class.forName(temp.attribute("class").getText());
Object actionObj = actionClass.newInstance();
Method[] actionMethods = actionClass.getDeclaredMethods();
Field[] actionFields = actionClass.getDeclaredFields();
for(Field field : actionFields){
try{
String key = field.getName();
String value = parameters.get(key);
String filedSetName = parSetName(key);
Method fieldSetMethod = actionClass.getMethod(filedSetName, field.getType());
fieldSetMethod.invoke(actionObj, value);
}catch(Exception e){
continue;
}
}
String tempResult = null;
for(Method method : actionMethods){
if("execute".equals(method.getName())){
tempResult = method.invoke(actionObj).toString();
}
}
System.out.println(tempResult);
Map<String,String> params = new HashMap<String,String>();
for(Field field : actionFields){
try{
String key = field.getName();
String value = null;
String filedGetName = parGetName(key);
Method filedGetMethod = actionClass.getMethod(filedGetName, new Class[] {});
value = filedGetMethod.invoke(actionObj,new Object[] {}).toString();
System.out.println(value);
params.put(key, value);
}catch(Exception e){
continue;
}
}
List<Element> results = temp.elements("result");
String resultVal = null;
for(Element result: results){
if(tempResult.equals(result.attribute("name").getText())){
resultVal = result.getStringValue();
break;
}
}
Class viewClass = View.class;
viewObj = viewClass.newInstance();
Field[] viewFields = viewClass.getDeclaredFields();
for(Field field : viewFields){
try{
String fieldName = field.getName();
String fieldType = field.getType().getSimpleName();
String filedSetName = parSetName(fieldName);
Method fieldSetMethod = viewClass.getMethod(filedSetName, field.getType());
if("Map".equalsIgnoreCase(fieldType)){
fieldSetMethod.invoke(viewObj, params);
}else if("String".equalsIgnoreCase(fieldType)){
fieldSetMethod.invoke(viewObj, resultVal);
}
}catch(Exception e){
continue;
}
}
System.out.println(viewObj);
} catch (Exception e) {
e.printStackTrace();
}
return (View)viewObj;
}
@Test
public void test(){
SAXReader reader = new SAXReader();
try {
Map<String,String> parameters = new HashMap<String,String>();
parameters.put("name","test");
parameters.put("password","1234");
String actionName = "login";
Document document = reader.read(new File("E://java开发环境"
+ "//java学习资料//java//java program//Coding2017//src//"
+ "com//sl//test20170304//struts//struts.xml"));
Element node = document.getRootElement();
List<Element> actionList = node.elements("action");
Element temp = null;
for(Element action : actionList){
Attribute nameAttr = action.attribute("name");
if(nameAttr.getText().equals(actionName)){
temp = action;
break;
}
}
Class actionClass = Class.forName(temp.attribute("class").getText());
Object actionObj = actionClass.newInstance();
Method[] actionMethods = actionClass.getDeclaredMethods();
Field[] actionFields = actionClass.getDeclaredFields();
for(Field field : actionFields){
try{
String key = field.getName();
String value = parameters.get(key);
String filedSetName = parSetName(key);
Method fieldSetMethod = actionClass.getMethod(filedSetName, field.getType());
fieldSetMethod.invoke(actionObj, value);
}catch(Exception e){
continue;
}
}
String tempResult = null;
for(Method method : actionMethods){
if("execute".equals(method.getName())){
tempResult = method.invoke(actionObj).toString();
}
}
System.out.println(tempResult);
Map<String,String> params = new HashMap<String,String>();
for(Field field : actionFields){
try{
String key = field.getName();
String value = null;
String filedGetName = parGetName(key);
Method filedGetMethod = actionClass.getMethod(filedGetName, new Class[] {});
value = filedGetMethod.invoke(actionObj,new Object[] {}).toString();
System.out.println(value);
params.put(key, value);
}catch(Exception e){
continue;
}
}
List<Element> results = temp.elements("result");
String resultVal = null;
for(Element result: results){
if(tempResult.equals(result.attribute("name").getText())){
resultVal = result.getStringValue();
break;
}
}
Class viewClass = View.class;
Object viewObj = viewClass.newInstance();
Field[] viewFields = viewClass.getDeclaredFields();
for(Field field : viewFields){
try{
String fieldName = field.getName();
String fieldType = field.getType().getSimpleName();
String filedSetName = parSetName(fieldName);
Method fieldSetMethod = viewClass.getMethod(filedSetName, field.getType());
if("Map".equalsIgnoreCase(fieldType)){
fieldSetMethod.invoke(viewObj, params);
}else if("String".equalsIgnoreCase(fieldType)){
fieldSetMethod.invoke(viewObj, resultVal);
}
}catch(Exception e){
continue;
}
}
System.out.println(viewObj);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 拼接在某属性的 set方法
*
* @param fieldName
* @return String
*/
public static String parSetName(String fieldName) {
if (null == fieldName || "".equals(fieldName)) {
return null;
}
int startIndex = 0;
if (fieldName.charAt(0) == '_')
startIndex = 1;
return "set"
+ fieldName.substring(startIndex, startIndex + 1).toUpperCase()
+ fieldName.substring(startIndex + 1);
}
/**
* 拼接在某属性的 get方法
*
* @param fieldName
* @return String
*/
public static String parGetName(String fieldName) {
if (null == fieldName || "".equals(fieldName)) {
return null;
}
int startIndex = 0;
if (fieldName.charAt(0) == '_')
startIndex = 1;
return "get"
+ fieldName.substring(startIndex, startIndex + 1).toUpperCase()
+ fieldName.substring(startIndex + 1);
}
}