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:

    ${applicationScope.app}

    ${sessionScope.ses}

    ${requestScope.req}

                   

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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