1、拦截器获取 Web 资源模式
2、静态对象获取 Web 资源模式
1、拦截器获取 Web 资源模式：
（1）使用Struts2 Aware拦截器
index.jsp表单：
<body>
<form action="<%=path %>/firstAction" method="post">
姓名：<input type="text" name="name"><br>
密码：<input type="password" name="pwd"><br>
<input type="submit" value="登录">
</form>
</body>
FirstAction.java:
package com.qyy.action;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
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;
/* 要实现拦截器接口,及其中的抽象方法
* 三个拦截器分别是 request，response，application
* 重写它们的抽象方法将private属性初始化
*
* 重写execute方法
*/
public class FirstAction implements ServletRequestAware, ServletResponseAware, ServletContextAware{
private ServletRequest request;
private ServletResponse response;
private ServletContext con;
public String execute() {
String username = request.getParameter("name");
System.out.println(username);
return "success";
}
@Override
public void setServletRequest(HttpServletRequest arg0) {
request = arg0;
}
@Override
public void setServletResponse(HttpServletResponse arg0) {
response = arg0;
}
@Override
public void setServletContext(ServletContext arg0) {
con = arg0;
}
}
struts.xml配置:
<struts>
<package name="test" extends="struts-default">
<action name="firstAction" class="com.qyy.action.FirstAction">
<result name="success">/index.jsp</result>
</action>
</package>
</struts>
（2）使用Struts2 RequestAware拦截器
index.jsp表单填写：
<body>
<form action="<%=path %>/secondAction" method="post">
姓名：<input type="text" name="name"><br>
密码：<input type="password" name="pwd"><br>
<input type="submit" value="登录">
</form>
</body>
SecondAction.java：
package com.qyy.action;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.struts2.StrutsStatics;
import org.apache.struts2.interceptor.RequestAware;
/*
* 使用Struts2 RequestAware拦截器
* 实现RequestAware接口
*
* 这样就完成了程序在走到这个类之前先经过拦截器，
* 拦截器负责调用这个类的setRequest（）方法将所以Web资源的对象通过map集合获取。
*/
public class SecondAction implements RequestAware{
private ServletRequest request;
private ServletResponse response;
private ServletContext con;
public String execute() {
String username = request.getParameter("name");
System.out.println("第二个action "+username);
return "success";
}
@Override
public void setRequest(Map<String, Object> arg0) {
request = (ServletRequest) arg0.get(StrutsStatics.HTTP_REQUEST);
response = (ServletResponse) arg0.get(StrutsStatics.HTTP_RESPONSE);
con = (ServletContext) arg0.get(StrutsStatics.SERVLET_CONTEXT);
}
}
Struts.xml配置：
<action name="secondAction" class="com.qyy.action.SecondAction">
<result name="success">/index.jsp</result>
</action>
2、静态对象获取 Web 资源模式
（1）使用Struts2内置静态对象ActionContext
ThirdAction.java:(比较简便的方法，不用继承或实现任何接口)
package com.qyy.action;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
/*
* 比较简便的方法，不用继承或实现任何接口
*/
public class ThirdAction {
public String execute() {
ActionContext ac = ActionContext.getContext();
/*然后就可以使用ac来获得资源
*/
ServletRequest request = (ServletRequest) ac.get(ServletActionContext.HTTP_REQUEST);
ServletResponse response = (ServletResponse) ac.get(ServletActionContext.HTTP_RESPONSE);
ServletContext con = (ServletContext) ac.get(ServletActionContext.SERVLET_CONTEXT);
String username = request.getParameter("name");
System.out.println("第三种 "+username);
return "success";
}
}
（2）使用Struts2内置静态对象ServletActionContext
***推荐使用的一种方式：最方便最简便的方法
package com.qyy.action;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.struts2.ServletActionContext;
public class FourthAction {
public String execute() {
ServletRequest request = ServletActionContext.getRequest();
ServletResponse response = ServletActionContext.getResponse();
ServletContext con = ServletActionContext.getServletContext();
String username = request.getParameter("name");
System.out.println("第四种 "+username);
return "success";
}
}