仿写 struts2 实现

/************************************************************ Copyright (C), 1996-2008, resoft Tech. Co., Ltd. FileName: ActionManager.java Author: superleo Version: 1.0 Date:2008-8-12 下午12:56:23 Description: Action解析类 Function List: 1. ------- History: <author> <time> <version > <desc> ***********************************************************/ package com.framework.core; import java.io.InputStream; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Iterator; 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 com.framework.util.StringUtil; import com.framework.util.XmlUtil; /** * @author superleo * @since 2008-8-12 * @version */ public class ActionManager { /** * struts.xml默认类路径 */ public static final String STRUTS_XML_FILE = "/struts.xml"; /** * struts.xml类路径 */ private String filePath; public ActionManager() { this.filePath = STRUTS_XML_FILE; } public ActionManager(String filePath) { this.filePath = filePath; } /** * 用于单元测试 */ public String test() { filePath = "/leo.xml"; return "success"; } /** * 根据StrutsFilter传过来的actionName,得到相应的Action类 * * @param actionName * StrutsFilter传过来的actionName * @return 相应的Action类的字符串 */ public ActionClass getActionClass(String actionName) { // 得到struts.xml类路径 InputStream is = this.getClass().getResourceAsStream(filePath); try { Document doc = XmlUtil.getDocument(is); Element root = XmlUtil.getRoot(doc); // 得到所有的package结点 List<Element> packages = XmlUtil.getElementsByName(root, "package"); if (packages != null && packages.size() > 0) { for (Element _package : packages) { // 得到某个package下的所有结点 List<Element> actions = XmlUtil.getElements(_package); for (Element elem : actions) { // 判断某个<result>结点元素的name属性是否与传递过来的actionName相等,如果相等那么将其method属性取出 Attribute att = XmlUtil .getAttributeByName(elem, "name"); if (StringUtil.equals(att.getText(), actionName)) { Attribute cls = XmlUtil.getAttributeByName(elem, "class"); Attribute method = XmlUtil.getAttributeByName(elem, "method"); List<Element> results = XmlUtil.getElementsByName( elem, "result"); ActionClass actionClass = new ActionClass(); actionClass.setClassName(cls.getText()); actionClass.setMethod(method.getText()); actionClass.setElements(results); return actionClass; } } } } } catch (DocumentException e) { e.printStackTrace(); throw new RuntimeException("struts.xml 不存在或有误"); } throw new RuntimeException("找不到名称为 [" + actionName + "] 的Action映射"); } /** * 调用Action,并执行Action的无参方法 * * @param actionClass * @param request.getParameterMap() * @return */ public Object setActionValues(ActionClass actionClass, Map<String, String[]> params) { try { // 得到Action的Class,并根据无参构造函数生成一个Action对象 Class clas = Class.forName(actionClass.getClassName()); Object obj = clas.newInstance(); if (params != null && params.size() > 0) { Iterator<String> it = params.keySet().iterator(); while (it.hasNext()) { String key = it.next(); String[] value = params.get(key); String upperFirstLetter = key.substring(0, 1).toUpperCase(); // 获得和属性对应的setXXX()方法的名字 String setMethodName = "set" + upperFirstLetter + key.substring(1); Method method = null; // 看看该页面提交的参数名中,是否在Action有set方法 try { method = clas.getMethod(setMethodName, new Class[] { String.class }); } catch (NoSuchMethodException e) { System.out.println("警告 " + actionClass.getClassName() + "." + setMethodName + "(" + String.class.getName() + ") 不存在"); } if (method != null) { // 如果有set方法,就调用set方法,进行赋值操作 String result = StringUtil.StringArrayToString(value); method.invoke(obj, new String[] { result }); } } } return obj; } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (SecurityException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } throw new RuntimeException("出现未知异常"); } /** * 调用Action,并执行Action的无参方法 * * @param actionClass * @param obj * 要处理的对象 * @return */ public Object invokeAction(ActionClass actionClass) { try { Object obj = actionClass.getAction(); Class clas = obj.getClass(); Method method = clas.getMethod(actionClass.getMethod(), null); String result = (String) method.invoke(obj, null); this.setInvokeResult(result, actionClass); actionClass.setAction(obj); return obj; } catch (InvocationTargetException e) { e.printStackTrace(); throw new RuntimeException("出现InvocationTargetException异常:" + e.getMessage()); } catch (SecurityException e) { e.printStackTrace(); throw new RuntimeException("出现SecurityException异常:" + e.getMessage()); } catch (NoSuchMethodException e) { e.printStackTrace(); throw new RuntimeException("出现NoSuchMethodException异常:" + e.getMessage()); } catch (IllegalAccessException e) { e.printStackTrace(); throw new RuntimeException("出现IllegalAccessException异常:" + e.getMessage()); } catch (IllegalArgumentException e) { e.printStackTrace(); throw new RuntimeException("出现IllegalArgumentException异常:" + e.getMessage()); } } /** * 匹配<result name="success">/index.jsp</result> Xml中的result * name属性，如果匹配成功,设置返回结果"/index.jsp" * * @param result * @param actionClass */ private void setInvokeResult(String result, ActionClass actionClass) { List<Element> elements = actionClass.getElements(); for (Element elem : elements) { Attribute name = XmlUtil.getAttributeByName(elem, "name"); if (StringUtil.equals(result, name.getText())) { actionClass.setResult(elem.getText()); return; } } throw new RuntimeException("请确定在xml配置文件中是否有名叫 [" + result + "]　的返回类型结点 "); } public String getFilePath() { return filePath; } }