struts之Action中获取request、response对象的方法

1、访问或添加request/session/application属性

public String scope() throws Exception{

    ActionContext ctx = ActionContext.getContext();

    ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app

    ctx.getSession().put("ses", "session范围");//往session里放入ses

    ctx.put("req", "request范围");//往request里放入req

    return "scope";

}

JSP:

<body>

    ${applicationScope.app} <br>

    ${sessionScope.ses}<br>

    ${requestScope.req}<br>

</body>

                   

2、获取HttpServletRequest/HttpSession/ServletContext/HttpServletResponse对象

方法一、通过ServletActionContext类直接获取：

public String rsa() throws Exception{

    HttpServletRequest request = ServletActionContext.getRequest();

    ServletContext servletContext = ServletActionContext.getServletContext();

    request.getSession();

    HttpServletResponse response = ServletActionContext.getResponse();

     return "scope";

}

方法二、实现指定接口，由struts框架运行时注入：

public class HelloWorldAction implements ServletRequestAware, ServletResponseAware, ServletContextAware{

    private HttpServletRequest request;

    private ServletContext servletContext;

    private HttpServletResponse response;

    public void setServletRequest(HttpServletRequest req) {

        this.request=req;

    }

    public void setServletResponse(HttpServletResponse res) {

        this.response=res;

    }

    public void setServletContext(ServletContext ser) {

        this.servletContext=ser;

    }

}

           

代码

package com.ljq.action;

import java.util.Arrays;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

public class HelloWorldAction {

//在页面中采用以下el表达式输出
//第一种
//${applicationScope.app} 
//${sessionScope.ses}
//${requestScope.req}
//第二种
//${app} 
//${ses}
//${req}
public String list() {
ActionContext ctx = ActionContext.getContext();
ctx.getApplication().put("app", "应用范围");// 往ServletContext里放入application
ctx.getSession().put("ses", "session范围");// 往session里放入session
ctx.put("req", "request范围");// 往request里放入request
ctx.put("names", Arrays.asList("张三", "李四", "王五"));
return "message";
}

//在页面中采用以下el表达式输出
//第一种
//${applicationScope.app} 
//${sessionScope.ses}
//${requestScope.req}
//第二种
//${app} 
//${ses}
//${req}
public String get() throws Exception {
HttpServletRequest request = ServletActionContext.getRequest();
ServletContext servletContext = ServletActionContext.getServletContext();
request.setAttribute("req", "请求范围属性");
request.getSession().setAttribute("ses", "会话范围属性");
servletContext.setAttribute("app", "应用范围属性");
// HttpServletResponse response = ServletActionContext.getResponse();
return "message";
}
}

jsp代码
${applicationScope.app} <br>
${sessionScope.ses}<br>
${requestScope.req}<br>
===========<br/>
${app} <br>
${ses}<br>
${req}<br>
===========<br/>
<c:forEach items="${names}" var="name">
${name }<br/>
</c:forEach>

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