struts2笔记05-ServletActionContext

1、ServletActionContext

ServletActionContext, 这个类继承自ActionContext, 所以它具有ActionContext的很多功能，不过更重要的是它提供了直接访问Servlet相关对象的功能，功能更强大，缺点是耦合程度提高了。

HttpServletRequest、ServletContext、PageContext、HttpServletResponse. HttpSession需要从HttpServletRequest实例中获取，并没有提供直接获取的方法。

2、测试代码

package com.test.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.PageContext;

import org.apache.struts2.ServletActionContext;

public class TestServletActionContextAction {
	public String execute() {
		// 1、HttpServletRequest
		HttpServletRequest request = ServletActionContext.getRequest();
		HttpSession session = request.getSession();

		// 2、ServletContext
		ServletContext servletContext = ServletActionContext
				.getServletContext();

		// 3、PageContext
		PageContext pageContext = ServletActionContext.getPageContext();

		// 4、HttpServletResponse
		HttpServletResponse response = ServletActionContext.getResponse();

		System.out.println("execute...");

		return "success";
	}
}