使用ServletActionContext访问Servlet API实战

谁借莪１个温暖的怀抱￠ 2021-07-24 13:11 324阅读 0赞

**一 action控制器**

package org.crazyit.app.action;
    
    import com.opensymphony.xwork2.*;
    import org.apache.struts2.*;
    
    import javax.servlet.http.*;
    
    import java.util.Map;
    
    
    public class LoginAction
        implements Action
    {
        private String username;
        private String password;
    
        // username的setter和getter方法
        public void setUsername(String username)
        {
            this.username = username;
        }
        public String getUsername()
        {
            return this.username;
        }
    
        // password的setter和getter方法
        public void setPassword(String password)
        {
            this.password = password;
        }
        public String getPassword()
        {
            return this.password;
        }
    
        public String execute() throws Exception
        {
            ActionContext ctx = ActionContext.getContext();
            // 通过ActionContext访问application范围的属性值
            Integer counter = (Integer)ctx.getApplication()
                .get("counter");
            if (counter == null)
            {
                counter = 1;
            }
            else
            {
                counter = counter + 1;
            }
            // 通过ActionContext设置application范围的属性
            ctx.getApplication().put("counter" , counter);
            // 通过ActionContext设置session范围的属性
            ctx.getSession().put("user" , getUsername());
            if (getUsername().equals("crazyit.org")
                && getPassword().equals("leegang") )
            {
                // 通过response添加Cookie
                Cookie c = new Cookie("user" , getUsername());
                c.setMaxAge(60 * 60);
                ServletActionContext.getResponse().addCookie(c);
                // 通过ActionContext设置request范围的属性
                ctx.put("tip" , "服务器提示：您已经成功的登录");
                return SUCCESS;
            }
            // 通过ActionContext设置request范围的属性
            ctx.put("tip" , "服务器提示：登录失败");
            return ERROR;
        }
    }

**二 配置文件**

<?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>
        <constant name="conststruts.devMode" value="true"/>
        
        <package name="lee" extends="struts-default">
            
            <action name="login" class="org.crazyit.app.action.LoginAction">
                
                <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

<%@ 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>登录页面</title>
    </head>
    <body>
    <form action="login.action" method="post">
    <table align="center">
        <caption><h3>用户登录</h3></caption>
        <tr>
            <td>用户名：<input type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密  码：<input type="text" name="password"/></td>
        </tr>
        <tr align="center">
            <td><input type="submit" value="登录"/><input type="reset" value="重填" /></td>
        </tr>
    </table>
    </form>
    </body>
    </html>

2 welcome.jsp

3 error.jsp

**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/c29cce3f0cef40fa81aa2d2b3e654222.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/8c07909cc96049369d5b7788a64ecdc6.png