How can we access the HttpServletRequest
cookqq ›博客列表 ›struts

How can we access the HttpServletRequest

2012-03-17 21:00:14.0|分类: struts|浏览量: 1623

摘要: You can obtain the request by asking the ActionContext or implementing ServletRequestAware. Imp...

You can obtain the request by asking the ActionContext or implementing ServletRequestAware. Implementing ServletRequestAware is preferred.

获得request可以通过请求ActionContext 和继承ServletRequestAware。优先 继承ServletRequestAware

1、请求ActionContext 

HttpServletRequest request = ServletActionContext.getRequest();

2、继承ServletRequestAware

  • (1)Ensure that servlet-config Interceptor is included in the Action's stack.
    •  The default stack already includes servlet-config.
  • (2)Edit the Action so that it implements the ServletRequestAware interface.
    • The ServletRequestAware interface expects a setServletRequest method. You may wish to include a companion getServletRequest method

 注:    When the servlet-config Interceptor sees that an Action implements ServletRequestAware, it passes a reference to the request the Action's setServletRequest method(看看下面的源码就明白了)

Servlet Config Interceptor设置action需要的所有的参数(session,Request,Response,Application)

struts-default.xml中 peizhservlet-config.

            <interceptor name="servletConfig" class="org.apache.struts2.interceptor.ServletConfigInterceptor"/>

ServletConfigInterceptor的代码如下:

public class ServletConfigInterceptor extends AbstractInterceptor implements StrutsStatics {

    private static final long serialVersionUID = 605261777858676638L;

    /**
     * Sets action properties based on the interfaces an action implements. Things like application properties,
     * parameters, session attributes, etc are set based on the implementing interface.
     *
     * @param invocation an encapsulation of the action execution state.
     * @throws Exception if an error occurs when setting action properties.
     */
    public String intercept(ActionInvocation invocation) throws Exception {
        final Object action = invocation.getAction();
        final ActionContext context = invocation.getInvocationContext();

        if (action instanceof ServletRequestAware) {
            HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
            ((ServletRequestAware) action).setServletRequest(request);
        }

        if (action instanceof ServletResponseAware) {
            HttpServletResponse response = (HttpServletResponse) context.get(HTTP_RESPONSE);
            ((ServletResponseAware) action).setServletResponse(response);
        }

        if (action instanceof ParameterAware) {
            ((ParameterAware) action).setParameters((Map)context.getParameters());
        }

        if (action instanceof ApplicationAware) {
            ((ApplicationAware) action).setApplication(context.getApplication());
        }
        
        if (action instanceof SessionAware) {
            ((SessionAware) action).setSession(context.getSession());
        }
        
        if (action instanceof RequestAware) {
            ((RequestAware) action).setRequest((Map) context.get("request"));
        }

        if (action instanceof PrincipalAware) {
            HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
            if(request != null) {
                // We are in servtlet environment, so principal information resides in HttpServletRequest
                ((PrincipalAware) action).setPrincipalProxy(new ServletPrincipalProxy(request));
            }
        }
        if (action instanceof ServletContextAware) {
            ServletContext servletContext = (ServletContext) context.get(SERVLET_CONTEXT);
            ((ServletContextAware) action).setServletContext(servletContext);
        }
        return invocation.invoke();
    }
}


一键分享文章

分类列表

  • • struts源码分析
  • • flink
  • • struts
  • • redis
  • • kafka
  • • ubuntu
  • • zookeeper
  • • hadoop
  • • activiti
  • • linux
  • • 成长
  • • NIO
  • • 关键词提取
  • • mysql
  • • android studio
  • • zabbix
  • • 云计算
  • • mahout
  • • jmeter
  • • hive
  • • ActiveMQ
  • • lucene
  • • MongoDB
  • • netty
  • • flume
  • • 我遇到的问题
  • • GRUB
  • • nginx
  • • 大家好的文章
  • • android
  • • tomcat
  • • Python
  • • luke
  • • android源码编译
  • • 安全
  • • MPAndroidChart
  • • swing
  • • POI
  • • powerdesigner
  • • jquery
  • • html
  • • java
  • • eclipse
  • • shell
  • • jvm
  • • highcharts
  • • 设计模式
  • • 列式数据库
  • • spring cloud
  • • docker+node.js+zookeeper构建微服务
版权所有 cookqq 感谢访问 支持开源 京ICP备15030920号
CopyRight 2015-2018 cookqq.com All Right Reserved.