MVC是什么我就不多说了，我们平时做JavaWeb项目时，大都会用SSH框架的不同组合，那能不能不用SSH框架来实现一个原生的MVC框架呢？
下面就让我们来实现一个自己的javaWeb MVC框架。
项目结构如下：
Controler的实现：
package com.shu.controler;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.shu.action.Action;
import com.shu.action.ActionFactory;
/**
* ControlerServlet,控制器类，所有的以.action结尾的请求都会被改控制器拦截，
*例如：http://localhost:8080/mvc/LoginAction.action
* @author Administrator
*
*/
public class ControlerServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 4660044561652707132L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String pathName = req.getServletPath();
System.out.println("pathName:" + pathName);
int index = pathName.indexOf(".");
String actionName = pathName.substring(1,index);
System.out.println("actionName:" + actionName);
String actionClass = getInitParameter(actionName);
System.out.println("actionClass:" + actionClass);
Action action = ActionFactory.getAction(actionName);
String viewUrl = action.execute(req, resp);
if (viewUrl == null) {
req.getRequestDispatcher("error.jsp").forward(req, resp);
} else {
req.getRequestDispatcher(viewUrl).forward(req, resp);
}
}
}
Action接口：
package com.shu.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Action 接口，所有的业务action类都需要实现此接口
* execute方法返回view资源的引用字符串，比如“admin/login.jsp”
*
* @author Administrator
*
*/
public interface Action {
public String execute(HttpServletRequest request, HttpServletResponse response);
}
Action工厂：
package com.shu.action;
import com.shu.actions.LoginAction;
/**
* 该工厂根据传入的Action名字返回具体的业务action实例
* @author Administrator
*
*/
public class ActionFactory {
public static Action getAction(String actionName) {
if (LoginAction.class.getSimpleName().equals(actionName)) {
return new LoginAction();
}
return null;
}
}
用户登录业务Action：
package com.shu.actions;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.shu.action.Action;
/**
* 处理用户登录的action类
* @author Administrator
*
*/
public class LoginAction implements Action {
@Override
public String execute(HttpServletRequest request,
HttpServletResponse response) {
String username = request.getParameter("username");
String password = request.getParameter("password");
request.setAttribute("username", username);
request.setAttribute("password", password);
if (username != null && username.trim().length() != 0
&& password != null && password.trim().length() != 0) {
return "admin/success.jsp";
}
return "admin/login.jsp";
}
}
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_2_5.xsd" id="WebApp_ID" version="2.5"> <servlet> <servlet-name>controlerServlet</servlet-name> <servlet-class>com.shu.controler.ControlerServlet</servlet-class> <init-param> <param-name>LoginAction</param-name> <param-value>com.shu.actions.LoginAction</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>controlerServlet</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> </web-app>
视图View层：login.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Login</title>
</head>
<body>
<form action="<%=request.getContextPath() %>/LoginAction.action" method="post">
username:<input type="text" name="username"/><br>
password:<input type="password" name="password"/><br>
<input type="submit" name="Login"/><br>
</form>
</body>
</html>
success.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Success!</h1>
username:<%=request.getParameter("username") %><p>
password:<%=request.getParameter("password") %><p>
</body>
</html>
测试：
时间： 2024-11-01 21:32:45