Struts2中action获取request、response、session的方式

最新推荐文章于 2019-07-04 16:56:16 发布

gmemai

最新推荐文章于 2019-07-04 16:56:16 发布

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分类专栏： struts1 文章标签： session

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本文介绍在Struts2框架中如何通过两种方式（非IoC和IoC方式）获取request、response和session对象，并展示了如何将数据放入session中及在页面上展示这些数据的具体代码。

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在struts1.x，request、session是方法自带的，直接调用就可以；在struts2.x中，BaseAction等底层都是封装好的，struts2的request、response、session都被隐藏的了，struts2提供有两种方式。
第一种方式，非IoC(Spring中的控制反转)方式：

    package com.action;  

    import java.util.Map;  

    import javax.servlet.http.HttpServletRequest;  
    import javax.servlet.http.HttpServletResponse;  

    import org.apache.struts2.ServletActionContext;  

    import com.opensymphony.xwork2.ActionContext;  
    import com.opensymphony.xwork2.ActionSupport;  

    public class BaseAction extends ActionSupport {  

        private static final long serialVersionUID = 7620009925942346125L;  

        ActionContext context = ActionContext.getContext();  
        HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);  
        HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);  
        Map session = context.getSession();  
        //SessionMap session = (SessionMap) context.get(ActionContext.SESSION);  

    }

session在struts2中被封装成了Map类型。
第二种方式，IoC方式：

    package com.action;  

    import java.util.Map;  

    import javax.servlet.http.HttpServletRequest;  
    import javax.servlet.http.HttpServletResponse;  

    import org.apache.struts2.dispatcher.SessionMap;  
    import org.apache.struts2.interceptor.ServletRequestAware;  
    import org.apache.struts2.interceptor.ServletResponseAware;  
    import org.apache.struts2.interceptor.SessionAware;  

    import com.opensymphony.xwork2.ActionContext;  
    import com.opensymphony.xwork2.ActionSupport;  



    public class BaseAction extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {  

        private static final long serialVersionUID = 7620009925942346125L;  

        ActionContext context = ActionContext.getContext();  
        HttpServletRequest request;  
        HttpServletResponse response;  
        SessionMap session;  

        //获取request,response,session方式一，非IoC方式，不用实现SessionAware, ServletRequestAware, ServletResponseAware  
        //ActionContext context = ActionContext.getContext();  
        //HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);  
        //HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);  
        //Map session = context.getSession();  
        //SessionMap session = (SessionMap) context.get(ActionContext.SESSION);  

        //获取request,response,session方式一，IoC方式，必须实现SessionAware, ServletRequestAware, ServletResponseAware  
        public void setSession(Map map) {  
            this.session = (SessionMap) map;  
        }  
        public void setServletRequest(HttpServletRequest request) {  
            this.request = request;  
        }  
        public void setServletResponse(HttpServletResponse response) {  
            this.response = response;  
        }  

    }

接继承这个BaseAction，request、response、session就可以使用了。

    public String findAllUsers() throws Exception {  

        List<User> userList = userService.findAllUsers();  

        HttpSession se = request.getSession();  
        se.setAttribute("userList", userList);  

        session.put("userList", userList);  
        //session.put("aaa", "bbb");  
        //session.put(key, value);  

        //request.setAttribute("userList", userList);  

        return SUCCESS;  
    }


    public String findAllUsers() throws Exception {  

        List<User> userList = userService.findAllUsers();  
        session.put("userList", userList);  
        //request.setAttribute("userList", userList);  

        return SUCCESS;  
    }


        <table class="table_report">  
        <tr>   
            <th>用户ID</th>  
            <th>用户名称</th>  
            <th>用户性别</th>  
            <th>用户年龄</th>  
            <th>用户地址</th>  
            <th>用户电话</th>  
            <th>用户邮箱</th>  
        </tr>  
        <!-- struts2最正规的取值方式 -->  
    <%--  <s:iterator id="user" value="%{#session.userList}">--%>  

       <s:iterator id="user" value="#session.userList">  
    <%--   <s:iterator id="user" value="#request.userList">--%>  
        <tr>  
            <td>${user.id}</td>  
            <td>${user.name}</td>  
            <td>${user.sex}</td>  
            <td>${user.age}</td>  
            <td>${user.address}</td>  
            <td>${user.phone}</td>  
            <td>${user.email}</td>  
        </tr>  
        </s:iterator>  
      </table>  
    <%-- 用完要清空 --%>  
    <%request.removeAttribute("userList");%>  
    <%--<%session.removeAttribute("userList");%>--%>