官方不推荐 JSP ，但是其实 JSP 还是不错的。
议题
- JSP On Spring Web MVC
- 手动装配
- Spring Boot 运用
Spring Boot 是自动装配的。
JSP On Spring MVC
- DispatcherServlet
- InternalResourceViewResolver
- JstlView
手动装配
- DispatcherServlet
- InternalResourceViewResolver
@Controller
Spring Boot 运用
- 自动装配
- DispatcherServlet
- InternalResourceViewResolver
- WebMvcAutoConfiguration
JSP On Spring MVC
Spring Framework Documentation
Version 5.1.3.RELEASE
What’s New, Upgrade Notes, Supported Versions, and other topics, independent of release cadence, are maintained externaly on the project’s Github Wiki.
Overview history, design philosophy,feedback, getting started. Core IoC container, Events, Resources, i18n, Validation, Data Binding, Type Conversion, SpEL, AOP. Testing Mock objects, TestContext framework, Spring MVC Test, WebTestClient. Data Access Transactions, DAO support, JDBC, ORM, Marshalling XML. Web Servlet Spring MVC, WebSocket, SockJS, STOMP messaging. Web Reactive Spring WebFlux, WebClient, WebSocket. Integration Remoting, JMS, JCA, JMX, Email, Tasks, Scheduling, Cache. Languages Kotlin, Groovy, Dynamic languages.
Spring Framework
same in Spring MVC 有一些都是可以通用的。
架构图：
javax.servlet.http.HttpServlet 里边是 get 方法 和 post 方法都有。
org.springframework.web.servlet.DispatcherServlet#doDispatch Spring Web MVC 的核心。
最早时期的 MVC
org.springframework.web.servlet.ModelAndView 最早的 Spring Web MVC
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@SpringBootApplication
public class SpringBootJspApplication implements WebMvcConfigurer {
public static void main(String[] args) {
SpringApplication.run(SpringBootJspApplication.class, args);
}
@Override
public void addViewControllers(ViewControllerRegistry registry) {
}
}
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public class IndexController implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest httpServletRequest,
HttpServletResponse httpServletResponse) throws Exception {
ModelAndView modelAndView = new ModelAndView();
// 封装模型“
Map<String, Object> model = modelAndView.getModel();
model.put("1", "aaa");
// 设置页面
modelAndView.setViewName("index");
return modelAndView;
}
}
Spring Boot 会自动化的装配 Spring 。
- An
InternalResourceViewResolvernamed ‘defaultViewResolver’. This one locates physical resources that can be rendered by using theDefaultServlet(including static resources and JSP pages, if you use those). It applies a prefix and a suffix to the view name and then looks for a physical resource with that path in the servlet context (the defaults are both empty but are accessible for external configuration throughspring.mvc.view.prefixandspring.mvc.view.suffix). You can override it by providing a bean of the same type.
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#defaultViewResolver
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@Bean
@ConditionalOnMissingBean
public InternalResourceViewResolver defaultViewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix(this.mvcProperties.getView().getPrefix());
resolver.setSuffix(this.mvcProperties.getView().getSuffix());
return resolver;
}
外部化配置
META-INF/spring-configuration-metadata.json
要经得起推敲。
手动装配
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@SpringBootApplication
public class SpringBootJspApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootJspApplication.class, args);
}
@Bean
public InternalResourceViewResolver defaultViewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/jsp/");
resolver.setSuffix(".jsp");
// path = prefix + @RequestMapping method return value + suffix
// path = "WEB-INF/jsp/" + "index" + ".jsp"
return resolver;
}
}
org.springframework.web.servlet.view.InternalResourceView#renderMergedOutputModel
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protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {
this.exposeModelAsRequestAttributes(model, request);
this.exposeHelpers(request);
// 准备渲染了
String dispatcherPath = this.prepareForRendering(request, response);
RequestDispatcher rd = this.getRequestDispatcher(request, dispatcherPath);
if (rd == null) {
throw new ServletException("Could not get RequestDispatcher for [" + this.getUrl() + "]: Check that the corresponding file exists within your web application archive!");
} else {
if (this.useInclude(request, response)) {
response.setContentType(this.getContentType());
if (this.logger.isDebugEnabled()) {
this.logger.debug("Including [" + this.getUrl() + "]");
}
rd.include(request, response);
} else {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Forwarding to [" + this.getUrl() + "]");
}
// forword
rd.forward(request, response);
}
}
}
View 并不是每一次都去渲染，
Thymleaf volacity 都是渲染。
org.springframework.web.servlet.View#render
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void render(@Nullable Map<String, ?> var1, HttpServletRequest var2, HttpServletResponse var3) throws Exception;
简便写法
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@GetMapping("index2")
public String excute(Model model) {
model.addAttribute("11", "aaa");
return "index";
}