(08)通过和 ServletAPI 耦合的方式获取 WEB 资源

小灰灰 2021-10-06 14:08 255阅读 0赞

### **通过和 ServletAPI 耦合的方式获取 WEB 资源** ###

#### 直接访问 Servlet API 将使 Action 与 Servlet 环境耦合在一起, 测试时需要有 Servlet 容器, 不便于对 Action 的单元测试，但是可以访问一些原生的ServletApi. ####

*  直接获取 HttpServletRequest 对象:  
    
    
     *  ServletActionContext.getRequest()
 *  直接获取 HttpSession 对象  
    
    
     *  ServletActionContext.getRequest().getSession()
 *  直接获取 ServletContext 对象  
    
    
     *  ServletActionContext.getServletContext()
 *  通过实现 ServletRequestAware, ServletContextAware 等接口的方式

--------------------

#### **1.通过ServletActionContext来获取** ####

##### 可比较非耦合ActionContext方式：[http://blog.csdn.net/qwdafedv/article/details/52403245][http_blog.csdn.net_qwdafedv_article_details_52403245] #####

public String test() {
            /* * ServletActionContext 可以获取到当前Action对象所需要的一切Servlet API相关的对象。 */
            HttpServletRequest request = ServletActionContext.getRequest();
            HttpSession session = ServletActionContext.getRequest().getSession();
            HttpServletResponse response = ServletActionContext.getResponse();
            ServletContext context = ServletActionContext.getServletContext();
    
            //......
    
            return "success";
        }

#### **2.通过实现ServletXXXAware接口，通过注入来获取** ####

##### 可比较非耦合实现XXXAware接口方式：[http://blog.csdn.net/qwdafedv/article/details/52412921][http_blog.csdn.net_qwdafedv_article_details_52412921] #####

package com.qbz.struts2_03_03;
    
    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;
    /* * 通过实现ServletXXXAware 接口的方式可以由Struts2 注入需要的Servlet相关的对象 * * ServletRequestAware：注入HttpServletRequest 对象 * ServletContextAware：注入ServletContext 对象 * ServletResponseAware：注入HttpServletResponse 对象 * */
    public class ServletXXXAwareTest implements ServletContextAware,ServletRequestAware,ServletResponseAware{ 
    
        private HttpServletRequest request ;
        private HttpSession session = request.getSession();
        private HttpServletResponse response ;
        private ServletContext context ;
    
        public String test(){
    
            //......
    
            return "success";
        }
    
        @Override
        public void setServletResponse(HttpServletResponse response) {
            this.response = response;
        }
    
        @Override
        public void setServletRequest(HttpServletRequest request) {
            this.request = request;
        }
    
        @Override
        public void setServletContext(ServletContext context) {
            this.context = context;
        }
    
    }

[http_blog.csdn.net_qwdafedv_article_details_52403245]: http://blog.csdn.net/qwdafedv/article/details/52403245
[http_blog.csdn.net_qwdafedv_article_details_52412921]: http://blog.csdn.net/qwdafedv/article/details/52412921