我最近配置了基于 spring 的 maven 項目，我只想用 java 替換我所有的 XML（POM 除外）。我瀏覽了很多關于此的文章和文檔，但是，我在這里的原因是，我有疑問，我認為這些疑問可以由你們解決。眾所周知，每個動態(tài) Web 項目都有一個 XML，它web.xml在沒有框架的情況下被調(diào)用。現(xiàn)在如果我們集成了一些框架，比如Struts、Spring、ORM等，這些也是需要配置的，所以我們再寫一個XML配置文件。我配置了 spring 項目，所以我有一個部署描述符、應用程序上下文和調(diào)度程序 servlet。WEB.XML<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/app-ctx.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>redirect.jsp</welcome-file> </welcome-file-list></web-app>app-ctx.xml</beans>
1 回答
慕姐8265434
TA貢獻1813條經(jīng)驗 獲得超2個贊
如果我理解它，您想擺脫所有XML配置。
然后首先你必須實現(xiàn)WebApplicationInitializer哪個替換web.xml配置文件。你可以這樣做：
public class CustomWebAppInitializer implements WebApplicationInitializer {
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
rootContext.register(RootConfig.class);
ContextLoaderListener contextLoaderListener = new ContextLoaderListener(rootContext);
servletContext.addListener(contextLoaderListener);
AnnotationConfigWebApplicationContext webContext = new AnnotationConfigWebApplicationContext();
webContext.register(MvcConfig.class);
DispatcherServlet dispatcherServlet = new DispatcherServlet(webContext);
ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcher", dispatcherServlet);
dispatcher.setLoadOnStartup(1);
dispatcher.addMapping("/");
}
}
另一個步驟是為替換app-ctx.xml 的根上下文實現(xiàn) Spring 配置：
@Configuration
@EnableWebMvc
@ComponentScan({"com.mzk.mavenproject1.service", "com.mzk.mavenproject1.model"})
public class RootConfig {
// ... provide another custom beans when needed
}
最后一步是為 MVC 實現(xiàn)配置，替換dispatcher-servlet.xml：
@Configuration
@EnableWebMvc
@ComponentScan("com.mzk.mavenproject1.controller")
public class MvcConfig extends WebMvcConfigurerAdapter {
@Bean
ViewResolver internalViewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
return resolver;
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
}
// ... provide another custom beans when needed
}
關于您關于課程數(shù)量的問題 - 是的，您只能通過兩個課程來完成：CustomWebAppInitializer并且MvcConfig所有內(nèi)容都只有一個上下文。
CustomWebAppInitializer.onStartup() 方法體將如下所示：
AnnotationConfigWebApplicationContext webContext = new AnnotationConfigWebApplicationContext();
webContext.register(MvcConfig.class);
ContextLoaderListener contextLoaderListener = new ContextLoaderListener(webContext);
servletContext.addListener(contextLoaderListener);
DispatcherServlet dispatcherServlet = new DispatcherServlet(webContext);
ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcher", dispatcherServlet);
dispatcher.setLoadOnStartup(1);
dispatcher.addMapping("/");
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