Spring 3基于Java的配置，替换XML – java程序员分享

本文介绍了Spring 3基于Java的配置，替换XML – java程序员分享，有助于帮助完成毕业设计以及求职，是一篇很好的资料。

对技术面试,学习经验等有一些体会，在此分享。

我最近配置了基于spring的maven项目，我只想用Java替换所有XML(POM除外)。我浏览了很多与此有关的文章和文档，但是，我在这里的原因是，我怀疑我想让你们解决这些问题。

众所周知，每个动态Web项目都有一个XML，在没有框架的情况下称为 web.xml 。

现在，如果我们集成一些框架，例如Struts，Spring，ORM等。
还必须配置它们，因此我们编写了另一个XML配置文件。

我配置了spring项目，所以我只有一个部署描述符，应用程序上下文和调度程序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

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xmlns:aop="http://www.springframework.org/schema/aop"        xmlns:context="http://www.springframework.org/schema/context"        xmlns:flow="http://www.springframework.org/schema/webflow-config"        xmlns:jee="http://www.springframework.org/schema/jee"        xmlns:jms="http://www.springframework.org/schema/jms"        xmlns:lang="http://www.springframework.org/schema/lang"        xmlns:osgi="http://www.springframework.org/schema/osgi"        xmlns:p="http://www.springframework.org/schema/p"        xmlns:tx="http://www.springframework.org/schema/tx"         xsi:schemaLocation="http://www.springframework.org/schema/beans                             http://www.springframework.org/schema/beans/spring-beans.xsd                            http://www.springframework.org/schema/aop                             http://www.springframework.org/schema/aop/spring-aop.xsd                            http://www.springframework.org/schema/context                              http://www.springframework.org/schema/context/spring-context.xsd                            http://www.springframework.org/schema/webflow-config                             http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.0.xsd                            http://www.springframework.org/schema/jee                             http://www.springframework.org/schema/jee/spring-jee.xsd                            http://www.springframework.org/schema/jms                             http://www.springframework.org/schema/jms/spring-jms.xsd                            http://www.springframework.org/schema/lang                             http://www.springframework.org/schema/lang/spring-lang.xsd                            http://www.springframework.org/schema/osgi                             http://www.springframework.org/schema/osgi/spring-osgi.xsd                            http://www.springframework.org/schema/tx                             http://www.springframework.org/schema/tx/spring-tx.xsd                            http://www.springframework.org/schema/util                             http://www.springframework.org/schema/util/spring-util.xsd">      <context:component-scan base-package="com.mzk.mavenproject1"/>  <!--    <bean id="propertyConfigurer"           class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"           p:location="/WEB-INF/config_local.properties" />-->   </beans> 

dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xmlns:aop="http://www.springframework.org/schema/aop"        xmlns:c="http://www.springframework.org/schema/c"        xmlns:mvc="http://www.springframework.org/schema/mvc"        xmlns:context="http://www.springframework.org/schema/context"        xmlns:flow="http://www.springframework.org/schema/webflow-config"        xmlns:jee="http://www.springframework.org/schema/jee"        xmlns:jms="http://www.springframework.org/schema/jms"        xmlns:lang="http://www.springframework.org/schema/lang"        xmlns:osgi="http://www.springframework.org/schema/osgi"        xmlns:p="http://www.springframework.org/schema/p"        xmlns:tx="http://www.springframework.org/schema/tx"        xmlns:util="http://www.springframework.org/schema/util"         xsi:schemaLocation="http://www.springframework.org/schema/beans                             http://www.springframework.org/schema/beans/spring-beans.xsd                            http://www.springframework.org/schema/aop                             http://www.springframework.org/schema/aop/spring-aop.xsd                            http://www.springframework.org/schema/context                              http://www.springframework.org/schema/context/spring-context.xsd                            http://www.springframework.org/schema/mvc                             http://www.springframework.org/schema/mvc/spring-mvc.xsd                            http://www.springframework.org/schema/webflow-config                             http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.0.xsd                            http://www.springframework.org/schema/jee                             http://www.springframework.org/schema/jee/spring-jee.xsd                            http://www.springframework.org/schema/jms                             http://www.springframework.org/schema/jms/spring-jms.xsd                            http://www.springframework.org/schema/lang                             http://www.springframework.org/schema/lang/spring-lang.xsd                            http://www.springframework.org/schema/osgi                             http://www.springframework.org/schema/osgi/spring-osgi.xsd                            http://www.springframework.org/schema/tx                             http://www.springframework.org/schema/tx/spring-tx.xsd                            http://www.springframework.org/schema/util                             http://www.springframework.org/schema/util/spring-util.xsd">      <mvc:resources mapping="/resources/**" location="/resources/"  cache-period="31556926" />     <context:component-scan base-package="com.mzk.mavenproject1"/>      <mvc:annotation-driven content-negotiation-manager="contentNegotiationManager"/>          <bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">         <!--Turn off working out content type based on URL file extension, should fall back to looking at the Accept headers-->         <property name="favorPathExtension" value="false" />     </bean>         <!-- 2. HandlerMapping : Used default handler mapping internally -->      <!-- 3. ViewResolver -->     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">         <property name="prefix" value="/WEB-INF/views/"/>         <property name="suffix" value=".jsp"/>     </bean>     </beans> 

混乱:

我很困惑地知道，java需要多少个类来替换相同的类。我们需要三个java类还是两个就足够了？

因为，很多文章都演示了这两个java类，它们分别替换了web.xml和dispatcher-servlet.xml，所以app-ctx.xml呢？

编辑:

 @Override     public void addViewControllers(ViewControllerRegistry registry) {         registry.addRedirectViewController("/", "home");     } 

要么

@Override         public void addViewControllers(ViewControllerRegistry registry) {            registry.addViewController("/").setViewName("home");         } 

控制器类

@Controller public class HomeController {      @RequestMapping(value="/")     public ModelAndView showhomePage() {         ModelAndView mav = new ModelAndView("home");         mav.addObject("successMsg", "Congratulations! Your Cortana is Properly congigured");         return mav;     } } 

我还做了一个技巧，创建了一个全局index.jsp，并仅指定一个scriptlet，它将使用`sendRedirect()将请求重定向到Controller。

喜欢

@Override             public void addViewControllers(ViewControllerRegistry registry) {                registry.addViewController("/").setViewName("forward:/index.jsp");             } 

每当我面对404时，我都想不起来什么片段？

参考方案

如果我对它的理解很好，那么您想摆脱所有XML配置。

然后，首先，您必须实现WebApplicationInitializer来替换web.xml配置文件。您可以这样做:

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("/");     } } 

另一个步骤是为root上下文实现Spring配置，该配置将替换app-ctx.xml:

@Configuration @EnableWebMvc @ComponentScan({"com.mzk.mavenproject1.service", "com.mzk.mavenproject1.model"}) public class RootConfig { // ... provide another custom beans when needed } 

最后一步是实现MVC的配置，该配置将替换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 } 

关于类计数的问题-是的，您只能通过两个类做到这一点:CustomWebAppInitializer和MvcConfig，并且所有内容只有一个上下文。
CustomWebAppInitializer.onStartup()方法主体将如下所示:

    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("/"); 

Spring XML中的公共值配置 – java

我有几个Spring bean，其中所有属性值之一都是相同的String值。有没有一种方法可以在XML中一次定义此String并在属性值设置的所有bean中引用它？<bean id="somebean" class="test.SomeBean"> <property name="prope…

Spring Security不允许加载CSS或JS资源 – java

该资源位于src / main / resources / static / css或src / main / resources / static / js下，我使用的是Spring Boot，安全级别为:@Configuration @EnableWebMvcSecurity @EnableGlobalAuthentication public clas…

Spring MVC拦截器映射问题 – java

我有这段XML：<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/statics/**" /> <bean class="com.company.website.servlet.StaticsHandlerIntercept…

Spring Boot如何在POST之后返回响应 – java

我想创建一个新客户并在创建客户后返回客户编号。客户编号必须是从50000开始的自动递增的唯一编号。到目前为止，我已经成功创建了一个客户，但是我不确定应该如何生成客户编号，将其保存到数据库中，并在触发POST时将其作为成功消息显示给用户。json下面是所需的响应；{ "customerNumber": "50002", …

Spring中的应用程序上下文有什么作用？ – java

我昨天问了一个问题（Using Spring in standalone apps），有关如何在独立应用程序中使用Spring。由此得知，您只创建一次应用程序上下文对象。因此，现在的问题是（即使在评论中得到了部分回答）创建应用程序上下文时会发生什么？当您说时，Spring是否会创建这些豆子并将它们连接在一起new ClassPathXmlApplicatio…

部分转自互联网，侵权删除联系