struts2笔记06-ServletXxxAware接口

1、ServletXxxAware接口

ActionContext和XxxAware接口对应，属于解耦的设计，但功能单一，我们能够获取到的只是struts2给我们返回的map。ServletActionContext和ServletXxxAware接口对应，属于耦合的设计，但功能强大，能够直接获取servlet相关的对象。

ServletXxxAware同样是struts2依赖注入给Action类的设计，使用起来比ServletActionContext方便，比如多个action的方法，就不需要每次都从context获取了。

ServletContextAware,ServletRequestAware, ServletResponseAware

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 org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;

public class TestServletAwareAction implements ServletContextAware,
		ServletRequestAware, ServletResponseAware {

	public String execute() {
		context.setAttribute("applicationKey", "applicationValue");
		HttpSession session = request.getSession();
		session.setAttribute("sessionKey", "sessionValue");
		request.setAttribute("requestKey", "requestValue");

		return "success";
	}

	// 注入的HttpServletResponse
	private HttpServletResponse response;

	@Override
	public void setServletResponse(HttpServletResponse response) {
		this.response = response;
	}

	// 注入的HttpServletRequest
	private HttpServletRequest request;

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

	// 注入的ServletContext
	private ServletContext context;

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

}