本文详细介绍了Struts框架中Action类如何通过ServletActionContext获取HttpServletRequest、HttpSession、ServletContext、HttpServletResponse对象，并展示了如何在不同作用域（request、session、application）中添加、访问或修改属性。
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>
${requestScope.req}<br>
</body>
2、获取HttpServletRequest/HttpSession/ServletContext/HttpServletResponse对象
方法一、通过ServletActionContext类直接获取：
public String rsa() throws Exception{
HttpServletRequest request = ServletActionContext.getRequest();
ServletContext servletContext =ServletActionContext.getServletContext();
request.getSession();
HttpServletResponse response = ServletActionContext.getResponse();
return "scope";
}
方法二、实现指定接口，由struts框架运行时注入：
public class HelloWorldAction implementsServletRequestAware, ServletResponseAware, ServletContextAware{
private HttpServletRequest request;
private ServletContext servletContext;
private HttpServletResponse response;
public void setServletRequest(HttpServletRequest req) {
this.request=req;
}
public void setServletResponse(HttpServletResponse res) {
this.response=res;
}
public void setServletContext(ServletContext ser) {
this.servletContext=ser;
}
}
代码
package com.ljq.action;
import java.util.Arrays;
import javax.servlet.ServletContext;
importjavax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
importcom.opensymphony.xwork2.ActionContext;
public class HelloWorldAction {
//在页面中采用以下el表达式输出
//第一种
//${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>
HttpServletRequest request =ServletActionContext.getRequest();
HttpSessionsession = request.getSession();
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