Struts2_通过 Aware 接口获取 WEB 资源

最新推荐文章于 2022-06-14 23:13:48 发布

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最新推荐文章于 2022-06-14 23:13:48 发布

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本文介绍如何在Struts2框架中通过实现Aware接口来访问应用上下文、会话、请求和参数。通过示例代码展示如何在TestAwareAction类中设置和获取application、session、request和参数数据。

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原文地址：https://blog.youkuaiyun.com/qq_36901488/article/details/82347285

Struts2_通过 Aware 接口获取 WEB 资源

index.jsp:

<%@page import="java.util.Date"%>
<%@ 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>

    <a href="TestActionContext.action?name=atguigu">Test ActionContext</a>

    <br><br>

    <a href="TestAware.do?name=atguigu">Test Aware</a>

    <br><br>

    <a href="testActionSupport.do">Test ActionSupport</a>

    <br><br>

    <a href="testResult.do?number=4">Test Result</a>

    <br><br>

    <a href="testDynamicMethodInvocation.do">Test DynamicMethodInvocation</a>

    <% 
        if(application.getAttribute("date") == null)
            application.setAttribute("date", new Date());

        request.setAttribute("req", "reqvalue");
    %>

</body>
</html>

新建一个 TestAwareAction 类:

package com.atguigu.struts2.action;

import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.ParameterAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

public class TestAwareAction implements ApplicationAware, SessionAware, RequestAware,
    ParameterAware{

    public String execute(){

        //1. 向 application 中加入一个属性: applicationKey2 - applicationValue2
        application.put("applicationKey2", "applicationValue2");

        //2. 从 application 中读取一个属性 date, 并打印. 
        System.out.println(application.get("date"));

        return "success";
    }

    public String save(){

        return null;
    }

    private Map<String, Object> application;

    @Override
    public void setApplication(Map<String, Object> application) {
        this.application = application;
    }

    @Override
    public void setParameters(Map<String, String[]> parameters) {

    }

    @Override
    public void setRequest(Map<String, Object> request) {
        // TODO Auto-generated method stub

    }

    @Override
    public void setSession(Map<String, Object> session) {
        // TODO Auto-generated method stub

    }

}

在 struts.xml 中配置:

<action name="TestAware" 
            class="com.atguigu.struts2.action.TestAwareAction">
            <result>/test-aware.jsp</result>    
        </action>

然后新建一个 test-aware.jsp 页面:

<%@ 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>

    <h4>Test Aware Page</h4>

    application: ${applicationScope.applicationKey2 }

</body>
</html>