3.4.2 与Servlet API耦合的访问方式

 public static HttpServletRequest getRequest()

public static ServletContext getServletContext()

public static HttpServletResponse getResponse()

ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);

ActionContext.getContext().get(ServletActionContext.SERVLET_CONTEXT);

 ActionContext.getContext().get(ServletActionContext.HTTP_RESPONSE);

package org.sunxin.struts2.ch03.action.way2;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import org.sunxin.struts2.ch03.model.User;

import com.opensymphony.xwork2.Action;

public class LoginAction3 implements Action
{ 
...

@Override
public String execute() throws Exception
{
if("zhangsan".equals(user.getUsername())
&& "1234".equals(user.getPassword()))
{
HttpServletRequest request = ServletActionContext.getRequest();      
HttpSession session = request.getSession();
ServletContext context = ServletActionContext.getServletContext();

/*ActionContext ctx = ActionContext.getContext();
HttpServletRequest request = (HttpServletRequest)ctx.get(Servlet ActionContext.HTTP_REQUEST);       
HttpSession session = request.getSession();
ServletContext context = (ServletContext)ctx.get(ServletAction Context.SERVLET_CONTEXT);*/

//在请求中放置欢迎信息。
request.setAttribute("greeting", "欢迎您来到程序员之家");

//在session中保存user对象
session.setAttribute("user", user);

//统计用户访问量，在application中保存用户访问量数据
Integer count = (Integer)context.getAttribute("counter");
if(null == count)
count=1;
else
count++;
context.setAttribute("counter", count);

return SUCCESS;
}
else
{
return ERROR;
}
}
}

 http://localhost:8080/ch03_4/login3.jsp

void setServletRequest(HttpServletRequest request)

void setServletContext(ServletContext context)

 package org.sunxin.struts2.ch03.action.way2;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.util.ServletContextAware;
import org.sunxin.struts2.ch03.model.User;

import com.opensymphony.xwork2.Action;

public class LoginAction4 implements Action, ServletRequestAware, ServletContextAware
{
private HttpServletRequest request;
private ServletContext context;

…

@Override
public String execute() throws Exception
{
if ("zhangsan".equals(user.getUsername())
&& "1234".equals(user.getPassword()))
{
HttpSession session = request.getSession();

//在请求中放置欢迎信息。
request.setAttribute("greeting", "欢迎您来到程序员之家");

//在session中保存user对象
session.setAttribute("user", user);

//统计用户访问量，在application中保存用户访问量数据
Integer count = (Integer) context.getAttribute("counter");
if (null == count)
count = 1;
else
count++;
context.setAttribute("counter", count);

return SUCCESS;
}
else
{
return ERROR;
}
}

@Override
public void setServletRequest(HttpServletRequest request)
{
this.request = request;
}

@Override
public void setServletContext(ServletContext context)
{
this.context = context;
}
}

http://localhost:8080/ch03_4/login4.jsp