自定义MVC
其实吧,自定义MVC虽然听着挺高大上的,不过就是模仿其他的框架(如Struts2等),在这里简单来说就是copy了一下,只是有些东西还是自己来写的.
*:自定义MVC只是用到了dom4j
1、Framework.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE Framework[ <!ELEMENT Framework (actions)> <!ELEMENT actions (action*)> <!ELEMENT action (rusult*)> <!ATTLIST action name CDATA #REQUIRED class CDATA #REQUIRED > <!ATTLIST result name CDATA #IMPLIED redirect (true|false) "false" > ]> <Framework> <actions> <action name="LoginAction" class="Action.LoginAction"> <result name="success">success.jsp</result> <result name="login">index.jsp</result> </action> </actions> </Framework>
2、Action接口
package Action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * 1、创建Action 接口 * * @author 123 * */ public interface Action { /** * Struts2源码中有五个静态字符串常量,在这里我们只需要两个就行 */ public static final String SUCCESS = "success"; public static final String LOGIN = "login"; // 方法 public String execute(HttpServletRequest request, HttpServletResponse response); }
3、ActionMapping类（创建actionMapping 一个actionMapping对应一个action节点）
package Action; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * 2、创建actionMapping 一个actionMapping对应一个action节点 * * @author 123 * */ public class ActionMapping { /** * name 是对应action中name属性值 classname 是对应ction中class属性值 */ private String name; private String classname; // action有多个result节点 private Map<String, String> results = new HashMap<String, String>(); public String getName() { return name; } public void setName(String name) { this.name = name; } public String getClassname() { return classname; } public void setClassname(String classname) { this.classname = classname; } public Map<String, String> getResults() { return results; } // 这个是不需要的 /* * public void setResults(Map<String, String> results) { this.results = * results; } */ // 对应result节点中name属性值和value属性值 public void addResult(String name, String value) { this.results.put(name, value); } public String getResults(String name) { return results.get(name); } }
4、ActionMappingManager（创建ActionMappingManager 一个actions节点下可能会多个action节点）
package Action; import java.io.InputStream; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; /** * 3、创建ActionMappingManager 一个actions节点下可能会多个action节点 * * @author 123 * */ public class ActionMappingManager { // actions中有多个action节点 private Map<String, ActionMapping> maps = new HashMap<String, ActionMapping>(); // 获取maps中的Actionmapping public ActionMapping get(String name) { return maps.get(name); } // 解析Framework.xml中节点中的数据 public void Init(String path) throws DocumentException { InputStream is = this.getClass().getResourceAsStream("/" + path); Document doc = new SAXReader().read(is); // 获取根节点 Element rootElement = doc.getRootElement(); // actions节点的获取 Element actions = (Element) rootElement.elementIterator("actions") .next(); // actions下有多个action节点 for (Iterator<Element> action = actions.elementIterator(); action .hasNext();) { // 具体的action节点 Element actionnext = action.next(); // 当前action节点对应class属性的值 String classname = actionnext.attributeValue("class"); // 当前action节点对应name属性的值 String name = actionnext.attributeValue("name"); ActionMapping mapp = new ActionMapping(); // 保存数据 mapp.setClassname(classname); mapp.setName(name); // 由于一个action下可能有存在多个result节点 for (Iterator<Element> result = actionnext.elementIterator(); result .hasNext();) { // 具体的result节点 Element resultnext = result.next(); String resultname = resultnext.attributeValue("name"); // 获取result节点中的数据 String page = resultnext.getText(); // 往里添加数据 mapp.addResult(resultname, page); } // 为maps填充数据 maps.put(mapp.getName(), mapp); } } /** * 把所有的xml中的数据装载起来 * * @param file * @throws DocumentException */ public ActionMappingManager(String[] file) throws DocumentException { // 遍历该数组 for (String filename : file) { Init(filename); } } }
5、LoginAction（实现是自己定义的Action接口）
package Action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 实现是自己定义的Action接口 * @author 123 * */ public class LoginAction implements Action { @Override public String execute(HttpServletRequest request, HttpServletResponse response) { String name = request.getParameter("name"); String pwd = request.getParameter("pwd"); if ("1".equals(pwd) && "1".equals(name)) { return SUCCESS; } return LOGIN; } }
6、YourServlet
package Servlet; import java.io.IOException; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.dom4j.DocumentException; import Action.Action; import Action.ActionManager; import Action.ActionMapping; import Action.ActionMappingManager; public class YourServlet extends HttpServlet { ActionMappingManager mapping = null; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获取actionMapping ActionMapping actionMapping = mapping.get(getPath(request)); System.out.println("actionMapping" + actionMapping); // 利用反射机制得到action try { String classname = actionMapping.getClassname(); System.out .println("classname=================================================================" + classname); Action loginAction = ActionManager.getActionClass(actionMapping .getClassname()); System.out.println("loginAction" + loginAction); // 调用execute方法 String message = loginAction.execute(request, response); System.out.println("message" + message); String results = actionMapping.getResults(message); System.out.println("results" + results); response.sendRedirect(results); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } // 解析地址访问路径 public String getPath(HttpServletRequest request) { // 获取项目名+请求地址 String requestURI = request.getRequestURI(); String ProjectPath = request.getContextPath(); // loginAction.action String path = requestURI.substring(ProjectPath.length()); System.out.println("ProjectPath" + ProjectPath); System.out.println("path" + path); System.out.println("requestURI" + requestURI); System.out.println("lastIndexOf" + path.lastIndexOf(".")); // 解析地址栏中的字符串 String trim = path.substring(1, path.lastIndexOf(".")).trim(); System.out.println(trim); return trim; } /** * * 当web容器启动的时候,就加载配置文件 */ @Override public void init(ServletConfig config) throws ServletException { System.out.println("呵呵"); // 获取初始化配置文件 String filename = config.getInitParameter("config"); String[] files = null; if (filename == null) { files = new String[] { "Framework.xml" }; } else { files = filename.split(","); } try { mapping = new ActionMappingManager(files); } catch (DocumentException e) { e.printStackTrace(); } } }
7、web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>customMVC</display-name> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>YourServlet</servlet-name> <servlet-class>Servlet.YourServlet</servlet-class> <load-on-startup>0</load-on-startup> </servlet> <servlet-mapping> <servlet-name>YourServlet</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
8、登陆页面
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form action="LoginAction.action" method="post"> 用户名:<input name="name"> 密码:<input name="pwd"> <input type="submit"> </form> </body> </html>
9、成功页面
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'success.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <h1>success!</h1> </body> </html>
10、成功了
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