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spring mvc流程詳解?

時(shí)間:2025-01-30 08:08 人氣:0 編輯:招聘街

一、spring mvc流程詳解?

1、首先創(chuàng)建父容器(AnnotationConfigWebApplicationContext),通過自定義的getRootConfigClasses()拿到配置類,并注冊到父容器中。

2、通過父容器作為參數(shù)創(chuàng)建ContextLoaderListener監(jiān)聽器。并添加到servletContext(Tomcat servlet容器)。

3、通過自定的getServletConfigClasses()方法拿到MVC的配置類創(chuàng)建子容器,并把配置類注冊到子容器中。

4、創(chuàng)建DispatcherServlet,并將DispatcherServlet添加到servletContext的Servlet容器中去。

5、設(shè)置dispatcherServlet相關(guān)屬性(啟動(dòng)時(shí)加載,設(shè)置映射路徑)。

二、spring mvc的原理?

Spring MVC屬于SpringFrameWork的后續(xù)產(chǎn)品,已經(jīng)融合在Spring Web Flow里面。

Spring 框架提供了構(gòu)建 Web 應(yīng)用程序的全功能 MVC 模塊。使用 Spring 可插入的 MVC 架構(gòu),可以選擇是使用內(nèi)置的 Spring Web 框架還是 Struts 這樣的 Web 框架。通過策略接口,Spring 框架是高度可配置的,而且包含多種視圖技術(shù)。

Spring MVC 分離了控制器、模型對象、分派器以及處理程序?qū)ο蟮慕巧@種分離讓它們更容易進(jìn)行定制。

三、spring mvc request作用?

1、@requestBody注解常用來處理content-type不是默認(rèn)的application/x-www-form-urlcoded編碼的內(nèi)容,比如說:application/json或者是application/xml等。一般情況下來說常用其來處理application/json類型。

  2、通過@requestBody可以將請求體中的JSON字符串綁定到相應(yīng)的bean上,當(dāng)然也可以將其分別綁定到對應(yīng)的字符串上。

    例如說以下情況:

$.ajax({       

 url:"/login",       

 type:"POST",        

data:'{"userName":"admin","pwd","admin123"}',      

  content-type:"application/json charset=utf-8",        

success:function(data)

{          

alert("request success ! ");       

 }    

});

 @requestMapping("/login")    

public void login(@requestBody String userName,@requestBody String pwd){      

System.out.println(userName+" :"+pwd);    

}

這種情況是將JSON字符串中的兩個(gè)變量的值分別賦予了兩個(gè)字符串,但是呢假如我有一個(gè)User類,擁有如下字段:      String userName;      String pwd;    那么上述參數(shù)可以改為以下形式:@requestBody User user 這種形式會(huì)將JSON字符串中的值賦予user中對應(yīng)的屬性上    需要注意的是,JSON字符串中的key必須對應(yīng)user中的屬性名,否則是請求不過去的。

 3、在一些特殊情況@requestBody也可以用來處理content-type類型為application/x-www-form-urlcoded的內(nèi)容,只不過這種方式不是很常用,在處理這類請求的時(shí)候,@requestBody會(huì)將處理結(jié)果放到一個(gè)MultiValueMap<String,String>中,這種情況一般在特殊情況下才會(huì)使用,例如jQuery easyUI的datagrid請求數(shù)據(jù)的時(shí)候需要使用到這種方式、小型項(xiàng)目只創(chuàng)建一個(gè)POJO類的話也可以使用這種接受方式。

作用:

      i) 該注解用于讀取Request請求的body部分?jǐn)?shù)據(jù),使用系統(tǒng)默認(rèn)配置的HttpMessageConverter進(jìn)行解析,然后把相應(yīng)的數(shù)據(jù)綁定到要返回的對象上;

      ii) 再把HttpMessageConverter返回的對象數(shù)據(jù)綁定到 controller中方法的參數(shù)上。

 

四、spring mvc安裝失???

原因有: spss軟件包有問題,可以重新下一個(gè)確定好用的再安裝 跟操作系統(tǒng)位數(shù)要一致 打開中文破解版安裝包,然后根據(jù)用戶自己的操作系統(tǒng)進(jìn)行相應(yīng)的安裝包的選擇

五、spring mvc原理詳解?

SpringMVC運(yùn)行原理

1. 客戶端請求提交到DispatcherServlet

2. 由DispatcherServlet控制器查詢一個(gè)或多個(gè)HandlerMapping,找到處理請求的Controller

3. DispatcherServlet將請求提交到Controller

4. Controller調(diào)用業(yè)務(wù)邏輯處理后,返回ModelAndView

5. DispatcherServlet查詢一個(gè)或多個(gè)ViewResoler視圖解析器,找到ModelAndView指定的視圖

6. 視圖負(fù)責(zé)將結(jié)果顯示到客戶端

六、Java Spring MVC: The Framework for Building Robust Web Applications

Java Spring MVC (Model-View-Controller) is a powerful framework that provides developers with the tools they need to build robust and scalable web applications. With its modular architecture and extensive libraries, Spring MVC has become one of the most popular choices for Java developers.

What is Java Spring MVC?

Java Spring MVC is an open-source framework that follows the Model-View-Controller architectural pattern. It helps developers build web applications that are loosely coupled and easy to test and maintain. The framework provides a set of classes and annotations that streamline the development process and promote best practices.

Key Features of Java Spring MVC

  • Model-View-Controller Architecture: Spring MVC separates the application logic into three distinct components: the model, the view, and the controller. This allows for better code organization and improves code reusability.
  • Dependency Injection (DI): Spring MVC makes use of dependency injection, allowing developers to easily manage and inject dependencies into their application.
  • Request Mapping: With Spring MVC, developers can map HTTP requests to specific methods or controller classes. This makes it easy to handle different types of requests and implement RESTful APIs.
  • Validation: Spring MVC provides a robust validation framework that allows for easy validation of user input.
  • Internationalization and Localization: Spring MVC supports internationalization and localization, making it easy to create applications that can be easily localized for different languages and regions.

Getting Started with Java Spring MVC

To get started with Java Spring MVC, developers need to set up a Spring MVC project and configure the necessary dependencies. They can then start writing controllers, views, and models to build their application. The Spring MVC framework provides a rich set of tools and libraries that developers can leverage to simplify their development process.

Benefits of Using Java Spring MVC

There are several benefits to using Java Spring MVC for web application development:

  • Modular and Scalable: The modular architecture of Spring MVC allows for easy integration with other frameworks and libraries. This makes it easy to scale and extend applications as needed.
  • Testability: Spring MVC promotes loose coupling and test-driven development, making it easier to write unit tests for different components of the application.
  • Productivity: Spring MVC provides a wide range of features and libraries that can help developers be more productive and focus on writing business logic rather than boilerplate code.
  • Community and Support: Spring MVC has a large and active community of developers who contribute to the framework and provide support through forums and tutorials.
  • Integration with Other Spring Projects: Spring MVC seamlessly integrates with other Spring projects, such as Spring Security, Spring Data, and Spring Boot, allowing developers to leverage the full power of the Spring ecosystem.

Conclusion

Java Spring MVC is a powerful framework for building robust and scalable web applications. With its modular architecture, extensive libraries, and strong community support, Spring MVC has become a popular choice for Java developers. Whether you are building a small application or a complex enterprise system, Spring MVC provides the tools and features you need to get the job done.

Thank you for reading this article. We hope it has provided you with a comprehensive overview of Java Spring MVC and its benefits. By leveraging the power of Spring MVC, you can build web applications that are maintainable, testable, and scalable.

七、spring core是spring mvc的核心容器?

spring mvc的容器是ioc,而ioc是spring core的組件,所以說spring core是spring mvc的核心容器。

八、spring mvc誰創(chuàng)建的?

說到 Spring,也許現(xiàn)在的開發(fā)者們最先想到的是 Josh Long。他憑借超快的語速與現(xiàn)場代碼能力,讓很多 Java 開發(fā)者折服。然而 Spring 的歷史上最傳奇的應(yīng)該是其創(chuàng)始人:Rod Johnson!

九、Spring MVC原理是什么?

Spring MVC是一種基于Java的Web應(yīng)用框架,它的原理是基于MVC(Model-View-Controller)設(shè)計(jì)模式。MVC是一種常用的Web應(yīng)用程序架構(gòu),它將Web應(yīng)用程序分為三個(gè)組件:模型(Model)、視圖(View)和控制器(Controller)。

Spring MVC的原理可以概括為以下幾個(gè)步驟:

1. 用戶發(fā)送請求:首先,用戶在瀏覽器中輸入U(xiǎn)RL,提交請求給服務(wù)器。

2. DispatcherServlet接收請求:DispatcherServlet是Spring MVC框架的核心組件,它負(fù)責(zé)接收所有的請求,并將請求委托給其他組件處理。

3. HandlerMapping處理器映射:HandlerMapping根據(jù)請求的URL路徑,找到可以處理該請求的處理器(Controller)。

4. HandlerAdapter處理器適配器:HandlerAdapter將請求傳遞給處理器(Controller),并將處理器的響應(yīng)返回給DispatcherServlet。

5. 視圖解析器:視圖解析器將處理器的響應(yīng)解析為視圖(View)。

6. 視圖渲染器:視圖渲染器將視圖轉(zhuǎn)換為HTML代碼,并將其發(fā)送回瀏覽器,呈現(xiàn)給用戶。

在Spring MVC框架中,Handler(控制器)是處理請求的核心組件,它通過注解或配置文件的方式將請求映射到相應(yīng)的處理方法上。同時(shí),Spring MVC還提供了豐富的視圖解析器(ViewResolver),可以根據(jù)請求的類型(如HTML、JSON等)選擇相應(yīng)的視圖渲染器進(jìn)行渲染。

總之,Spring MVC框架采用MVC設(shè)計(jì)模式,通過DispatcherServlet、HandlerMapping、HandlerAdapter、視圖解析器和視圖渲染器等核心組件,實(shí)現(xiàn)了對Web應(yīng)用程序的請求處理、響應(yīng)渲染等功能。

十、spring mvc線程安全嗎?

參考如下內(nèi)容:Spring MVC的Controller用的是Servlet的思想,單例性能好,但線程不安全,如果用其它的Scope,性能會(huì)下降。建議用默認(rèn)單例方式,實(shí)現(xiàn)要共享對象屬性,可以用ThreadLocal保護(hù)。

controller默認(rèn)是單例的,不要使用非靜態(tài)的成員變量(service無所謂,因?yàn)樗粫?huì)變),否則會(huì)發(fā)生數(shù)據(jù)邏輯混亂。

比如a線程將int i=3,b線程將 i = 4,然后a再訪問 i 時(shí), i的值為4

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