如何在带注释的@controller 类中获取 Spring WebContext
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How to get Spring WebContext in class annotated @controller
提问by Kaushik Lele
In Spring MVC with annotation, we mark any POJO with @Controller. In this controller we can get WebApplicationContext, using autowired property.
在带有注解的 Spring MVC 中，我们用 @Controller 标记任何 POJO。在这个控制器中，我们可以使用自动装配的属性获取 WebApplicationContext。
@Controller
public class HomePageController {
@Autowired
ApplicationContext act;
@RequestMapping("/*.html")
public String handleBasic(){
SimpleDomain sd = (SimpleDomain)act.getBean("sd1");
System.out.println(sd.getFirstProp());
return "hello";
}
But in this approach we do not have servletContext handy with us. So is there way we can still use older way of getting WebApplicationContext ? i.e.
但是在这种方法中，我们手头没有 servletContext。那么有没有办法我们仍然可以使用旧的方式来获取 WebApplicationContext ？IE
WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext)
How will we get servletContext here ?
我们将如何在这里获得 servletContext ？
I am not facing any compulsion to use old way; so this question is just out of curiosity to check flexibility of spring. Also It can be a interview question.
我没有面临使用旧方式的任何强迫；所以这个问题只是出于好奇来检查弹簧的灵活性。也可以是面试题。
回答by Biju Kunjummen
You can just inject it into your controller:
您可以将其注入控制器：
@Autowired private ServletContext servletContext;
Or take HttpServletRequest as a parameter and get it from there:
或者将 HttpServletRequest 作为参数并从那里获取它：
@RequestMapping(...)
public ModelAndView myMethod(HttpServletRequest request ...){
ServletContext servletContext = request.getServletContext()
}
回答by Jeevan Patil
The following is correct approach :
以下是正确的做法：
@Autowired
ServletContext context;
Otherwise instead of auto wiring the ServletContext, you can implement ServletContextAware. Spring will notice this when running in a web application context and inject the ServletContext. Read this.
否则，您可以实现 ServletContextAware，而不是自动连接 ServletContext。Spring 在 Web 应用程序上下文中运行时会注意到这一点并注入 ServletContext。读这个。
回答by Guy L
You can also do it inline:
您也可以内联进行：
@RequestMapping(value = "/demp", method = RequestMethod.PUT)
public String demo(@RequestBody String request) {
HttpServletRequest re3 = ((ServletRequestAttributes) RequestContextHolder
.getRequestAttributes()).getRequest();
return "sfsdf";
}
回答by sendon1982
You can implement an Interface from Spring called org.springframework.web.context.ServletContextAware
您可以从 Spring 实现一个名为的接口 org.springframework.web.context.ServletContextAware
public class MyController implements ServletContextAware {
private ServletContext servletContext;
@Override
public void setServletContext(ServletContext servletContext) {
this.servletContext=servletContext;
}
}
Then you can use the servletContextany place in the class.
然后你可以servletContext在类中的任何地方使用。
回答by ElderMael
By accessing the session you can get the servlet context, sample code:
通过访问会话，您可以获得 servlet 上下文，示例代码：
@Controller
public class MyController{
....
@RequestMapping(...)
public ModelAndView myMethod(HttpSession session ...){
WebApplicationContextUtils.getRequiredWebApplicationContext(session.getServletContext())
}
}
You can get the HttpSession from the HttpServletRequest also.
您也可以从 HttpServletRequest 获取 HttpSession。
