struts2得到request response和session等对象

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1 非IoC方式
要获得这几个对象，关键Struts 2.0中com.opensymphony.xwork2.ActionContext类。我们可以通过它的静态方法getContext()获取当前Action的上下文对象。

ActionContext.getContext()code]另外，org.apache.struts2.ServletActionContext作为辅助类（Helper Class），可以帮助您快捷地获得这几个对象。

HttpServletRequest request = ServletActionContext.getRequest(); HttpServletResponse response = ServletActionContext.getResponse(); HttpSession session = request.getSession();

如果你只是想访问session的属性（Attribute），你也可以通过ActionContext.getContext().getSession()获取或添加session范围（Scoped）的对象。

import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class NonIocServlet extends ActionSupport {    private String message;        public String getMessage() {        return message;            }        @Override    public String execute() {            ActionContext.getContext().getSession().put("msg", "Hello World from Session!");                HttpServletRequest request = ServletActionContext.getRequest();        HttpServletResponse response = ServletActionContext.getResponse();                HttpSession session = request.getSession();  //      ActionContext.getContext().getSession();                StringBuffer sb =new StringBuffer("Message from request: ");        sb.append(request.getParameter("msg"));        sb.append("<br>Response Buffer Size: ");        sb.append(response.getBufferSize());        sb.append("<br>Session ID: ");        sb.append(session.getId());                message = sb.toString();        return SUCCESS;    }}

2 IoC方式
要使用IoC方式，我们首先要告诉IoC容器（Container）想取得某个对象的意愿，通过实现相应的接口做到这点。

import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;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;publicclass IoCServlet extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {    private String message;    private Map att;    private HttpServletRequest request;    private HttpServletResponse response;            public String getMessage() {        return message;            }        publicvoid setSession(Map att) {        this.att = att;    }        publicvoid setServletRequest(HttpServletRequest request) {        this.request = request;    }        publicvoid setServletResponse(HttpServletResponse response) {        this.response = response;    }        @Override    public String execute() {                att.put("msg", "Hello World from Session!");                HttpSession session = request.getSession();                StringBuffer sb =new StringBuffer("Message from request: ");        sb.append(request.getParameter("msg"));        sb.append("<br>Response Buffer Size: ");        sb.append(response.getBufferSize());        sb.append("<br>Session ID: ");        sb.append(session.getId());                message = sb.toString();        return SUCCESS;    }}