JavaWeb实验 MVC架构与Struts2应用

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已于 2024-03-25 09:35:24 修改

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文章标签： mvc 架构 struts

于 2024-03-16 09:30:00 首次发布

本文链接：https://blog.youkuaiyun.com/Jiangxia13/article/details/136570916

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实验目的

认识MVC开发架构；
Struts2的初步应用。

实验内容

配置Struts2环境，包括web.xml中filter过滤器配置，struts.xml中action的配置；
利用Struts2实现登录功能：因为数据库读取不是本章节的重要内容，为方便起见，本实验不进行数据库读取操作，当用户名和密码相同时认为登录成功，不相同时登录不成功。登录成功时，跳转到页面success.jsp，页面显示“用户xxx登录成功”，登录失败时，跳转到页面fail.jsp，页面显示“用户xxx登录失败”。
创建另外一个action，在登录成功界面显示三个链接，通过点击链接传入id到该action，根据id的值（例如为1，2，3），在返回的view.jsp页面显示对应新闻内容。

Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	id="WebApp_ID" version="3.1">
	<display-name>MVC</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.jsp</welcome-file>
		<welcome-file>default.htm</welcome-file>
	</welcome-file-list>
	<filter>
		<filter-name>struts</filter-name>
		<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

</web-app>

Struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC "EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<constant name="struts.aciton.extension" value="ac"></constant>
	<package name="struts" extends="struts-default">
		<action name="loginsubmit" class="com.gdpu.Login"
			method="execute">
			<result name="success">success.jsp</result>
			<result name="fail">fail.jsp</result>
		</action>
		<action name="viewNews" class="com.gdpu.ViewNewsAction"
			method="execute">
			<result name="success">view.jsp</result>
			<result name="fail">fail.jsp</result>
		</action>
	</package>
</struts>

Login.java
package com.gdpu;

public class Login {
	private String username;
	private String password;
	private String message;
	public String execute() {
		System.out.println("Login execute() username=" + username);
		System.out.println("Login execute() password=" + password);
		if ("huangoedian".equals(username) && "123321".equals(password)) {
			setMessage("用户 " + username + " 登录成功"); 
			return "success";
		} else {
			setMessage("用户 " + username + " 登录失败");  
			return "fail";
		}
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
}

ViewNewsAction.java
package com.gdpu;

public class ViewNewsAction {
	private int id;
	private String newsContent;

	public String execute() {
		if (id == 1) {
			newsContent = "杨丞琳“河南人爱骗人”风波后首露面，戴帽子口罩遮挡严实，老公李荣浩账号被刷屏：管管你媳妇！口无遮拦";
		} else if (id == 2) {
			newsContent = "24岁男子为进酒厂工作娶64岁女子，失败后起诉离婚并要求女子退款10万，法院：准予离婚，返还一半";
		} else if (id == 3) {
			newsContent = "三男两女寻求刺激一夜吸掉840瓶“笑气”，房间内一片狼藉，警方：均为00后，因朋友介绍接触笑气，已被行拘";
		} else {
			return "fail";
		}
		return "success";
	}
	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getNewsContent() {
		return newsContent;
	}

	public void setNewsContent(String newsContent) {
		this.newsContent = newsContent;
	}
}

Success.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Success</title>
</head>
<body>
<h1>${message}</h1>
<a href="<s:url action='viewNews'><s:param name='id' value='1'/></s:url>">新闻1</a><br>
<a href="<s:url action='viewNews'><s:param name='id' value='2'/></s:url>">新闻2</a><br>
<a href="<s:url action='viewNews'><s:param name='id' value='3'/></s:url>">新闻3</a><br>
</body>
</html>

Fail.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Fail</title>
</head>
<body>
<h1>${message}</h1>
</body>
</html>

View.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>News</title>
</head>
<body>
<h1>新闻内容</h1>
<p>${newsContent}</p>
</body>
</html>

web.xml中Struts2配置过滤器filter部分参考：
<filter>
    <filter-name>struts</filter-name>
    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
  	<filter-name>struts</filter-name>
  	<url-pattern>/*</url-pattern>
</filter-mapping>

struts.xml中Struts2配置action部分参考：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC   "EN"   "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<package name="struts" extends="struts-default">
		<action name="login" class="com.gdpu.Login">
			<result name="success">success.jsp</result>
			<result name="fail">fail.jsp</result>
		</action>
		<action name="view" class="com.gdpu.View">
			<result name="success">view.jsp</result>
		</action>
	</package>
</struts>