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struts之Action中获取request、response对象的方法

2014-10-02 14:34 453 查看

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} 
 ${sessionScope.ses} 
 ${requestScope.req} 
</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>
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标签： application struts2

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