1、与Servlet API解耦的访问方式。
a.Struts2对HttpServletRequest、HttpSession、ServletContext进行了封装，构造了三个Map对象来替代这三种对象要获取这三个Map对象，使用ActionContext类。
----->
package pro.action;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class TestAction extends ActionSupport{
public TestAction(){
}
public String execute() throws Exception {
ActionContext context=ActionContext.getContext();
Map request=(Map)context.get("request");
Map session=context.getSession();
Map application=context.getApplication();
return "";
}
//
}
b.实现RequestAware、SessionAware、ApplicationAware接口。
---->
package pro.action;
import java.util.Map;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;
import com.opensymphony.xwork2.ActionSupport;
public class TestAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware{
private Map request;
private Map session;
private Map application;
public TestAction(){}
public void setRequest(Map request) {
this.request=request;
}
public void setSession(Map session) {
this.session=session;
}
public void setApplication(Map application) {
this.application=application;
}
//
}
2、与Servlet API耦合的访问方式。
a.要直接获取HttpServletRequest、HttpServletResponse、ServletContext这些对象，可以使用ServletActionContext类，该类是ActionContext的子类。
public static HttpServletRequest getRequest(); public static ServletContext getServletContext(); public static HttpServletResponse getResponse();
b.实现ServletRequestAware和ServletContextAware接口。
--->
package pro.action;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.util.ServletContextAware;
import com.opensymphony.xwork2.ActionSupport;
public class TestAction extends ActionSupport implements ServletRequestAware,ServletContextAware{
private HttpServletRequest request;
private ServletContext context;
public void setServletRequest(HttpServletRequest request) {
this.request=request;
}
public void setServletContext(ServletContext context) {
this.context=context;
}
//
}