您的位置：首页 > 编程语言 > Java开发

利用jsp和Servlet实现自己的原生JavaEE MVC框架

2015-05-11 12:30 435 查看

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：

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航