struts之Action中获取request、response对象的方法

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