Struts的action结果类型——PreResultListener实战

Dear 丶 2021-07-25 00:23 341阅读 0赞

**一 action**

package org.crazyit.app.action;
    
    import com.opensymphony.xwork2.*;
    import com.opensymphony.xwork2.interceptor.PreResultListener;
    
    
    public class LoginRegistAction
        extends ActionSupport
    {
        // 封装用户请求参数的两个成员变量
        private String username;
        private String password;
        // username的setter和getter方法
        public String getUsername()
        {
            return username;
        }
        public void setUsername(String username)
        {
            this.username = username;
        }
        // password的getter和setter方法
        public String getPassword()
        {
            return password;
        }
        public void setPassword(String password)
        {
            this.password = password;
        }
    
        // Action包含的注册控制逻辑
        public String regist() throws Exception
        {
            ActionContext.getContext().getSession()
                .put("user" , getUsername());
            addActionMessage("恭喜您," + getUsername() + ",您已经注册成功！");
            return SUCCESS;
        }
        // Action默认包含的控制逻辑
        public String execute() throws Exception
        {
            ActionInvocation invocation = ActionContext
                .getContext().getActionInvocation();
            invocation.addPreResultListener(new PreResultListener()
            {
                public void beforeResult(ActionInvocation invocation,
                    String resultCode)
                {
                    System.out.println("返回的逻辑视图名字为："
                        + resultCode);
                    // 在返回Result之前加入一个额外的数据。
                    invocation.getInvocationContext().put("extra"
                        , new java.util.Date() + "由"
                        + resultCode + "逻辑视图名转入");
                    // 也可加入日志等
                }
            });
            if (getUsername().equals("crazyit.org")
                && getPassword().equals("leegang") )
            {
                ActionContext.getContext().getSession()
                    .put("user" , getUsername());
                addActionMessage("欢迎," + getUsername() + ",您已经登录成功！");
                return SUCCESS;
            }
            return ERROR;
        }
    }

**二 配置**

<?xml version="1.0" encoding="GBK"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
        <package name="lee" extends="struts-default">
            
            <action name="login" class="org.crazyit.app.action.LoginRegistAction">
                
                <result name="error">/WEB-INF/content/error.jsp</result>
                <result>/WEB-INF/content/welcome.jsp</result>
            </action>
            
            <action name="regist" class="org.crazyit.app.action.LoginRegistAction"
                method="regist">
                
                <result name="error">/WEB-INF/content/error.jsp</result>
                <result>/WEB-INF/content/welcome.jsp</result>
            </action>
            <action name="*">
                <result>/WEB-INF/content/{1}.jsp</result>
            </action>
        </package>
    </struts>

**三 视图**

1 loginForm.jsp

<%--
    网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
    author  yeeku.H.lee kongyeeku@163.com
    version  1.0
    Copyright (C), 2001-2016, yeeku.H.Lee
    This program is protected by copyright laws.
    Program Name:
    Date:
    --%>
    
    <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>登录页面</title>
    </head>
    <body>
    <table width="300" align="center">
    <form action="login" method="post">
        <tr>
            <td>用户名:</td>
            <td><input type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密  码:</td>
            <td><input type="text" name="password"/></td>
        </tr>
        <tr>
            <td><input type="submit" value="登录"
                onclick="this.form.action='login';"/></td>
            <td><input type="submit" value="注册"
                onclick="regist();"/></td>
        </tr>
    </form>
    <table>
    <script type="text/javascript">
    function regist()
    {
        // 获取页面的第一个表单
        targetForm = document.forms[0];
        // 动态修改表单的action属性
        targetForm.action = "regist";
    }
    </script>
    </body>
    </html>

2 welcome.jsp

3 error.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>错误页面</title>
    </head>
    <body>
        对不起，您登录失败！
    </body>
    </html>

**四 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/b1e3042b875d4655ae11a81916bafb15.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/854e365b3a944e9baa7f8c0fbc21933a.png