struts中的action和Action类以及struts2中如何在Action类中获得servlet api的域对象

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package com.yd.action;
import java.util.Map;
import org.apache.struts2.dispatcher.SessionMap;
import com.opensymphony.xwork2.ActionContext;
import com.sun.xml.internal.bind.v2.runtime.Name;
public class TestActionContextAction {
public String getServeltObject(){
//获得ActionContext对象
该对象可以获得Action所需要的Servlet的原生域对象
ActionContext actionContext=ActionContext.getContext();
//1.获得HttpServletRequest对应的map 对其做操作并且进行存储
这个是获得是attribute中的值
Map<String, Object> requestMap=(Map<String, Object>)actionContext.get("request");
String name=(String) requestMap.get("name");
System.out.println("name="+name);
requestMap.put("cat", "My name is Tom");
//2.获得HttpSession对应的Map
对该对象做操作
自动进行更行原生域对象
Map<String, Object> sessionMap=actionContext.getSession();
String price=(String) sessionMap.get("price");
SessionMap<String, Object> sessionMap1=(SessionMap<String, Object>)sessionMap;
//SessionMap其实就是session对应的map
调用其invalidate方法
即可以使session失效
sessionMap1.invalidate();
System.out.println("price="+price);
sessionMap.put("dog", "I am a dog");
//3.获得ServletContext
Map<String, Object> applicationMap=actionContext.getApplication();
Integer age=(Integer) applicationMap.get("age");
System.out.println("age="+age);
applicationMap.put("person", "I have a lot of money");
//4.获得paramters
Map<String, Object> parameterMap=actionContext.getParameters();
String[] name1=(String[]) parameterMap.get("name");
//System.out.println("name="+name1[0]);
parameterMap.put("key", "value");
return "success";
}
}

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package com.yd.action;
import java.util.Map;
import org.apache.struts2.interceptor.ApplicationAware;
public class TestRealizeAware implements ApplicationAware{
private Map<String, Object> application;
public String getServletObject(){
Integer age=(Integer)application.get("age");
System.out.println("age="+age);
application.put("key", "value");
return "success";
}
//当创建该Action对象时
struts机制自动调用该方法
实现将值注入
@Override
public void setApplication(Map<String, Object> application) {
this.application=application;
}
}

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package com.yd.action;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
//处理请求的Action类
public class TestServletActionContext {
/*
* 通过耦合的方式获得Servlet API中的对象
* 1.这种方式是通过ServletActionContext获得
*
* */
public String getObject(){
HttpServletRequest request=ServletActionContext.getRequest();
//获得session是通过request获得的
HttpSession session=request.getSession();
//获得上下文对象
ServletContext context=ServletActionContext.getServletContext();
System.out.println("request="+request+"
getObject");
return "success";
}
}

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package com.yd.action;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;
public class TestServletAware implements ServletRequestAware,ServletResponseAware,ServletContextAware{
/*
*
通过实现ServletxxxAware接口来实现
对象的注入
* */
@Override
public void setServletContext(ServletContext context) {
System.out.println(context);
}
@Override
public void setServletResponse(HttpServletResponse response) {
System.out.println(response);
}
@Override
public void setServletRequest(HttpServletRequest request) {
System.out.println(request);
}
public String getObject(){
return "success";
}
}