Struts2取得Servlet API中的一些对象

Strutx 2.0你可以有两种方式获得这些对象：非IoC（控制反转Inversion of Control）方式和IoC方式。

非IoC方式

要获得上述对象，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。 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。

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。具体实现，请参考例6 IocServlet.java。
package tutorial;

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;

publicclass 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();

StringBuffer sb =new StringBuffer("Message from request: ");
sb.append(request.getParameter("msg"));
sb.append("
Response Buffer Size: ");
sb.append(response.getBufferSize());
sb.append("
Session ID: ");
sb.append(session.getId());

message = sb.toString();
return SUCCESS;
}
}例6 classes/tutorial/NonIoCServlet.java

package tutorial;

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("
Response Buffer Size: ");
sb.append(response.getBufferSize());
sb.append("
Session ID: ");
sb.append(session.getId());

message = sb.toString();
return SUCCESS;
}
}


http://www.blogjava.net/max/archive/2006/10/18/75857.html
常用的Struts2.0的标志