F-sm-1. Talk about the comparative advantages of SPRINGMVC and struts1,struts2.
性能上Struts1>SpringMvc>Struts2 开发速度上SpringMvc和Struts2差不多,比Struts1要高
F-sm-2. What is the core entrance class of SPRINGMVC, and what is the difference between struts1,struts2?
SpringMvc的是DispatchServlet,Struts1的是ActionServlet,Struts2的是StrutsPrepareAndExecuteFilter
F-sm-3. SPRINGMVC Controller is not a singleton mode, if yes, what is the problem, how to solve
是单例模式,所以在多线程访问的时候有线程安全问题,不要用同步,会影响性能的,解决方案是在控制器里面不能写字段
F-sm-4. Annotations for controllers in Spingmvc generally with that, there are no other annotations to replace
一般用@Conntroller注解,表示是表现层,不能用用别的注解代替.
F-sm-5. What does @RequestMapping annotation do with a class?
用于类上,表示类中的所有响应请求的方法都是以该地址作为父路径。
F-sm-6. How to map a request to a specific method
直接在方法上面加上注解@RequestMapping,并且在这个注解里面写上要拦截的路径
F-sm-7. If in the interception request, I want to intercept the method that the Get method commits, how to configure
可以在@RequestMapping注解里面加上method=RequestMethod.GET
F-sm-8. If in the interception request, I want to intercept the commit parameter contains the "Type=test" string, How to configure
可以在@RequestMapping注解里面加上params="type=test"
F-sm-9. I want to get the parameters from the foreground in the interception method, how to get
直接在形参里面声明这个参数就可以,但必须名字和传过来的参数一样
F-sm-10. If the foreground has a number of parameters passed in, and these parameters are all an object, then how to get this object quickly
直接在方法中声明这个对象,SpringMvc就自动会把属性赋值到这个对象里面
F-sm-11. How to get a request in a method, or a session
直接在方法的形参中声明request,SpringMvc就自动把request对象传入
F-sm-12. What is the return value of the function in Springmvc.
返回值可以有很多类型,有String, ModelAndView,当一般用String比较好
F-sm-13. Springmvc How to handle the return value
SpringMvc根据配置文件中InternalResourceViewResolver的前缀和后缀,用前缀+返回值+后缀组成完整的返回值
F-sm-14. Springmvc how to set redirection and forwarding
在返回值前面加"forward:"就可以让结果转发,譬如"forward:user.do?name=method4" 在返回值前面加"redirect:"就可以让返回值重定向,譬如"redirect:http://www.baidu.com"
F-sm-15. Springmvc what objects are used to pass data from the background to the foreground
通过ModelMap对象,可以在这个对象里面用put方法,把对象加到里面,前台就可以通过el表达式拿到
F-sm-16. There's a class in SPRINGMVC that combines views and data together, what's called
叫ModelAndView
F-SM-17. How to put the data inside the Modelmap into the session
可以在类上面加上@SessionAttributes注解,里面包含的字符串就是要放入session里面的key
F-sm-18. How SPRINGMVC and Ajax call each other.
通过Jackson框架就可以把Java里面的对象直接转化成Js可以识别的Json对象 具体步骤如下 1.加入Jackson.jar 2.在配置文件中配置json的映射 3.在接受Ajax方法里面可以直接返回Object,List等,但方法前面要加上@ResponseBody注解
F-sm-19. What to do when a method returns special objects to Ajax, such as object,list, etc.
要加上@ResponseBody注解
F-sm-20. SPRINGMVC, what did the Interceptor say?
有两种写法,一种是实现接口,另外一种是继承适配器类,然后在SpringMvc的配置文件中配置拦截器即可: <!-- 配置SpringMvc的拦截器 --><mvc:interceptors> <!-- 配置一个拦截器的Bean就可以了 默认是对所有请求都拦截 --> <bean id="myInterceptor" class="com.et.action.MyHandlerInterceptor"></bean> <!-- 只针对部分请求拦截 --> <mvc:interceptor> <mvc:mapping path="/modelMap.do" /> <bean class="com.et.action.MyHandlerInterceptorAdapter" /> </mvc:interceptor></mvc:interceptors>
F-sm-21. Talk about the SPRINGMVC implementation process
系统启动的时候根据配置文件创建spring的容器, 首先是发送http请求到核心控制器disPatherServlet,spring容器通过映射器去寻找业务控制器,使用适配器找到相应的业务类,在进业务类时进行数据封装,在封装前可能会涉及到类型转换,执行完业务类后使用ModelAndView进行视图转发,数据放在model中,用map传递数据进行页面显示。
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