java struts2入门学习实例－－用户注册和用户登录整合

2022-11-28 19:44:26

需求：

１、用户注册(user_register.jsp)－－》注册成功(UserRegister.action)－－》显示注册信息(register_success.jsp)
２、用户登录(user_login.jsp)－－》登录成功(UserLogin.action)－－》显示用户名(login_success.jsp)

分析：

这里主要涉及struts2中对于多个类似的业务操作方法的封装。

效果：

针对需求１，用户注册：

针对需求２，用户登录：

实现：

user_register.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <form name="register" action="/struts2/UserRegister" method="post">

        <table border="2" align="center">

            <caption>新用户注册</caption>

            <tr>

                <th>用户名：</th>

                <td><input name="username" id="username" type="text" /></td>

            </tr>

            <tr>

                <th>密码：</th>

                <td><input name="password" id="password" type="password" /></td>

            </tr>

            <tr>

                <td colspan="2" align="center"><input type="submit" value="提交"

                    width="120ppx" /></td>

            </tr>

        </table>

    </form>

</body>

</html>

user_login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <form name="register" action="/struts2/UserLogin" method="post">

        <table border="2" align="center">

            <caption>用户登录</caption>

            <tr>

                <th>用户名：</th>

                <td><input name="username" id="username" type="text" /></td>

            </tr>

            <tr>

                <td colspan="2" align="center"><input type="submit" value="提交"

                    width="120ppx" /></td>

            </tr>

        </table>

    </form>

</body>

</html>

UserAction.java

package com.amos.web.action;

import com.opensymphony.xwork2.ActionSupport;

/**

 * @ClassName: UserAction

 * @Description: 用户管理，将相关的action封装到一个类中

 * @author: amosli

 * @email:amosli@infomorrow.com

 * @date Jan 8, 2014 1:06:00 AM

 */

public class UserAction extends ActionSupport {

    private static final long serialVersionUID = -6275534406709255984L;

    private String username;

    private String password;

    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;

    }

    // 用户注册

    public String register() throws Exception {

        return "toRegisterJsp";

    }

    // 用户登录

    public String login() throws Exception {

        return "toLoginJsp";

    }

}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <!-- 加载其他配置文件 -->

    <include file="config/user_struts.xml"></include>

</struts>

user_struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <package name="user" namespace="/" extends="struts-default">

        <action name="UserRegister" class="com.amos.web.action.UserAction"

            method="register">

            <result name="toRegisterJsp" type="dispatcher">

            /register_success.jsp

            </result>

        </action>

        <action name="UserLogin" class="com.amos.web.action.UserAction"

            method="login">

            <result name="toLoginJsp" type="dispatcher">

            /login_success.jsp

            </result>

        </action>

    </package>

</struts>

login_success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib uri="/struts-tags" prefix="s" %>

<!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=UTF-8">

<title>Insert title here</title>

</head>

<body>

登录成功！

<hr>

用户名:<s:property value="username"/>

</body>

</html>

register_success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib uri="/struts-tags" prefix="s"  %>

<!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=UTF-8">

<title>Insert title here</title>

</head>

<body>

注册成功<br/>

<hr>

用户名：<s:property value="username" />

密码：<s:property value="password"/>

</body>

</html>

代码分析：

代码的入口为两个jsp程序，user_register.jsp和user_login.jsp，因为原理大体相同，这里主要讲一下登录，注册上一篇文章已经讲过了。

首先，在地址栏里输入http://localhost:8080/struts2/user_login.jsp，表单的action动作为POST方式提交，对应的动作时是UserLogin.action;UserLogin在struts启动时struts.xml加载到内存中时已经将user_struts.xml 反射出来了。user_struts.xml中已经配置了,调用com.amos.web.action.UserAction中的login方法，然后将值再转发到login_success.jsp中，login_success.jsp，通过s标签进行取值并最终显示到浏览器中。

这里最主要的思想在于将登录和注册这两种相类似的业务，相关联的业务整合到一个action中。

用

户注册(user_register.jsp)－－》注册成功(UserRegister.action)－－》显示注册信息(register_success.jsp)

用户登录(user_login.jsp)－－》登录成功(UserLogin.action)－－》显示用户名(login_success.jsp)

码农公寓

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