springmvc与struts2中获取request对象

来源：互联网发布：南京财经大学垃圾知乎编辑：程序博客网时间：2024/05/19 13:59

因为框架的不同获取request对象的方式也会有改变：

springMVC中获取request的方式有三种：

1.使用注解：

@Autowiredprivate  HttpServletRequest request;

2.最简单的方式：参数

@RequestMapping("/test")@ResponseBodypublic void saveTest(HttpServletRequest req, HttpServletResponse resp){　　}

3. 加入监听器，然后在代码里面获取 --在web.xml中配置一个监听:

<listener>          <listener-class>              org.springframework.web.context.request.RequestContextListener          </listener-class>  </listener>

然后在代码里面获取:

HttpServletRequest req = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();HttpServletResponse resp = ((ServletWebRequest)RequestContextHolder.getRequestAttributes()).getResponse();

原理：

RequestContextListener实现了 ServletRequestListener ,在其覆盖的requestInitialized(ServletRequestEvent requestEvent)方法中,将request最终设置到了RequestContextHolder中.

public class RequestContextListener implements ServletRequestListener {    private static final String REQUEST_ATTRIBUTES_ATTRIBUTE =            RequestContextListener.class.getName() + ".REQUEST_ATTRIBUTES";    @Override    public void requestInitialized(ServletRequestEvent requestEvent) {        if (!(requestEvent.getServletRequest() instanceof HttpServletRequest)) {            throw new IllegalArgumentException(                    "Request is not an HttpServletRequest: " + requestEvent.getServletRequest());        }        HttpServletRequest request = (HttpServletRequest) requestEvent.getServletRequest();//从事件对象中获取request对象        ServletRequestAttributes attributes = new ServletRequestAttributes(request);//将request设置到servletRequestAttributes中        request.setAttribute(REQUEST_ATTRIBUTES_ATTRIBUTE, attributes);//反过来将servletRequestAttributes设置到request中        LocaleContextHolder.setLocale(request.getLocale());        RequestContextHolder.setRequestAttributes(attributes);//再将servletRequestAttributes设置到requestContextHolder中    }

如何在Struts2中获取request对象：

HttpServletRequest request = ServletActionContext.getRequest();

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