SpringBoot--Web篇<二>

4. SpringMVC自动配置

https://docs.spring.io/spring-boot/docs/1.5.10.RELEASE/reference/htmlsingle/#boot-features-developing-web-applications

1. Spring MVC auto-configuration

Spring Boot 自动配置好了SpringMVC

以下是SpringBoot对SpringMVC的默认配置:==(WebMvcAutoConfiguration)==

  • Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans.

    • 自动配置了ViewResolver(视图解析器:根据方法的返回值得到视图对象(View),视图对象决定如何渲染(转发?重定向?))
    • ContentNegotiatingViewResolver:组合所有的视图解析器的;
    • ==如何定制:我们可以自己给容器中添加一个视图解析器;自动的将其组合进来;==
  • Support for serving static resources, including support for WebJars (see below).静态资源文件夹路径,webjars

  • Static index.html support. 静态首页访问

  • Custom Favicon support (see below). favicon.ico

  • 自动注册了 of Converter, GenericConverter, Formatter beans.

    • Converter:转换器; public String hello(User user):类型转换使用Converter
    • Formatter 格式化器; 2017.12.17===Date;
        @Bean
        @ConditionalOnProperty(prefix = "spring.mvc", name = "date-format")//在文件中配置日期格式化的规则
        public Formatter dateFormatter() {
            return new DateFormatter(this.mvcProperties.getDateFormat());//日期格式化组件
        }
==自己添加的格式化器转换器,我们只需要放在容器中即可==
  • Support for HttpMessageConverters (see below).

    • HttpMessageConverter:SpringMVC用来转换Http请求和响应的;User---Json;

    • HttpMessageConverters 是从容器中确定;获取所有的HttpMessageConverter;

      ==自己给容器中添加HttpMessageConverter,只需要将自己的组件注册容器中(@Bean,@Component)==

  • Automatic registration of MessageCodesResolver (see below).定义错误代码生成规则

  • Automatic use of a ConfigurableWebBindingInitializer bean (see below).

    ==我们可以配置一个ConfigurableWebBindingInitializer来替换默认的;(添加到容器)==

    初始化WebDataBinder;
    请求数据=====JavaBean;
    

org.springframework.boot.autoconfigure.web:web的所有自动场景;

If you want to keep Spring Boot MVC features, and you just want to add additional MVC configuration (interceptors, formatters, view controllers etc.) you can add your own @Configuration class of type WebMvcConfigurerAdapter, but without @EnableWebMvc. If you wish to provide custom instances of RequestMappingHandlerMapping, RequestMappingHandlerAdapter or ExceptionHandlerExceptionResolver you can declare a WebMvcRegistrationsAdapter instance providing such components.

If you want to take complete control of Spring MVC, you can add your own @Configuration annotated with @EnableWebMvc.

2. 扩展SpringMVC

    
    
        
            
            
        
    

==编写一个配置类(@Configuration),是WebMvcConfigurerAdapter类型;不能标注@EnableWebMvc==;

既保留了所有的自动配置,也能用我们扩展的配置;

/**
 * @Author cyy
 * @Date 2018/8/13 11:11
 * @Version 1.0
 * @Blog http://pccwcyy.club/wordpress/
 **/
//使用 WebMvcConfigurationSupport 可以来扩展SpringMVC的功能
@Configuration
public class MyMvcConfig extends WebMvcConfigurationSupport {

    @Override
    protected void addViewControllers(ViewControllerRegistry registry) {
//        super.addViewControllers(registry);
        //浏览器发送/cyy,请求来到success页面
        registry.addViewController("/cyy").setViewName("success");
    }
}

原理:

1)WebMvcAutoConfiguration是SpringMVC的自动配置类

2)在做其他自动配置时会导入;@Import(**EnableWebMvcConfiguration**.class)
    @Configuration
    public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration {
      private final WebMvcConfigurerComposite configurers = new WebMvcConfigurerComposite();

     //从容器中获取所有的WebMvcConfigurer
      @Autowired(required = false)
      public void setConfigurers(List configurers) {
          if (!CollectionUtils.isEmpty(configurers)) {
              this.configurers.addWebMvcConfigurers(configurers);
                //一个参考实现;将所有的WebMvcConfigurer相关配置都来一起调用;  
                @Override
             // public void addViewControllers(ViewControllerRegistry registry) {
              //    for (WebMvcConfigurer delegate : this.delegates) {
               //       delegate.addViewControllers(registry);
               //   }
              }
          }
    }
3)容器中所有的WebMvcConfigurer都会一起起作用;

4)我们的配置类也会被调用;

效果:SpringMVC的自动配置和我们的扩展配置都会起作用;

3. 全面接管SpringMVC;

SpringBoot对SpringMVC的自动配置不需要了,所有都是我们自己配置;所有的SpringMVC的自动配置都失效了

我们需要在配置类中添加@EnableWebMvc即可;

//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
@EnableWebMvc
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
       // super.addViewControllers(registry);
        //浏览器发送 /atguigu 请求来到 success
        registry.addViewController("/atguigu").setViewName("success");
    }
}

原理:

为什么@EnableWebMvc自动配置就失效了;

1)@EnableWebMvc的核心

@Import(DelegatingWebMvcConfiguration.class)
public @interface EnableWebMvc {

2)

@Configuration
public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport {

3)

@Configuration
@ConditionalOnWebApplication
@ConditionalOnClass({ Servlet.class, DispatcherServlet.class,
        WebMvcConfigurerAdapter.class })
//容器中没有这个组件的时候,这个自动配置类才生效
@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10)
@AutoConfigureAfter({ DispatcherServletAutoConfiguration.class,
        ValidationAutoConfiguration.class })
public class WebMvcAutoConfiguration {

4)@EnableWebMvc将WebMvcConfigurationSupport组件导入进来;

5)导入的WebMvcConfigurationSupport只是SpringMVC最基本的功能;

5. 如何修改SpringBoot的默认配置

模式:

1)、SpringBoot在自动配置很多组件的时候,先看容器中有没有用户自己配置的(@Bean、@Component)如果有就用用户配置的,如果没有,才自动配置;如果有些组件可以有多个(ViewResolver)将用户配置的和自己默认的组合起来;

2)、在SpringBoot中会有非常多的xxxConfigurer帮助我们进行扩展配置

3)、在SpringBoot中会有很多的xxxCustomizer帮助我们进行定制配置

6. RestfulCRUD

1)默认访问首页


//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
//@EnableWebMvc   不要接管SpringMVC
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
       // super.addViewControllers(registry);
        //浏览器发送 /atguigu 请求来到 success
        registry.addViewController("/atguigu").setViewName("success");
    }

    //所有的WebMvcConfigurerAdapter组件都会一起起作用
    @Bean //将组件注册在容器
    public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
        WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {
                registry.addViewController("/").setViewName("login");
                registry.addViewController("/index.html").setViewName("login");
            }
        };
        return adapter;
    }
}

2)国际化

一般的Spring做国际化的步骤:

1)编写国际化配置文件;

2)使用ResourceBundleMessageSource管理国际化资源文件

3)在页面使用fmt:message取出国际化内容

SpringBoot中做国际化的步骤:

1)编写国际化配置文件,抽取页面需要显示的国际化消息


此处输入图片的描述

2)SpringBoot自动配置好了管理国际化资源文件的组件;

@ConfigurationProperties(prefix = "spring.messages")
public class MessageSourceAutoConfiguration {
    
    /**
     * Comma-separated list of basenames (essentially a fully-qualified classpath
     * location), each following the ResourceBundle convention with relaxed support for
     * slash based locations. If it doesn't contain a package qualifier (such as
     * "org.mypackage"), it will be resolved from the classpath root.
     */
    private String basename = "messages";  
    //我们的配置文件可以直接放在类路径下叫messages.properties;
    
    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        if (StringUtils.hasText(this.basename)) {
            //设置国际化资源文件的基础名(去掉语言国家代码的)
            messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(
                    StringUtils.trimAllWhitespace(this.basename)));
        }
        if (this.encoding != null) {
            messageSource.setDefaultEncoding(this.encoding.name());
        }
        messageSource.setFallbackToSystemLocale(this.fallbackToSystemLocale);
        messageSource.setCacheSeconds(this.cacheSeconds);
        messageSource.setAlwaysUseMessageFormat(this.alwaysUseMessageFormat);
        return messageSource;
    }

3)去页面获取国际化的值;
先设置项目的编码为UTF-8:File->Setting->File Encodings,记得勾选 Transparent xxx;


项目编码设置


    
        
        
        
        
        Signin Template for Bootstrap
        
        
        
        
    

    
        

    


这样的做的效果:根据浏览器语言设置的信息切换了国际化;
原理:

国际化Locale(区域信息对象);LocaleResolver(获取区域信息对象);
        @Bean
        @ConditionalOnMissingBean
        @ConditionalOnProperty(prefix = "spring.mvc", name = "locale")
        public LocaleResolver localeResolver() {
            if (this.mvcProperties
                    .getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {
                return new FixedLocaleResolver(this.mvcProperties.getLocale());
            }
            AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
            localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
            return localeResolver;
        }
默认的就是根据请求头带来的区域信息获取Locale进行国际化

4)点击链接切换国际化

/**
 * 可以在链接上携带区域信息
 */
public class MyLocaleResolver implements LocaleResolver {
    
    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        String l = request.getParameter("l");
        Locale locale = Locale.getDefault();
        if(!StringUtils.isEmpty(l)){
            String[] split = l.split("_");
            locale = new Locale(split[0],split[1]);
        }
        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {

    }
}

 @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }
}

3)登陆

开发期间模板引擎页面修改以后,要实时生效

1)禁用模板引擎的缓存

# 禁用缓存
spring.thymeleaf.cache=false 

2)页面修改完成以后ctrl+f9:重新编译;
登陆错误消息的显示

4)拦截器进行登陆检查

拦截器


/**
 * 登陆检查,
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if(user == null){
            //未登陆,返回登陆页面
            request.setAttribute("msg","没有权限请先登陆");
            request.getRequestDispatcher("/index.html").forward(request,response);
            return false;
        }else{
            //已登陆,放行请求
            return true;
        }

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

注册拦截器

  //所有的WebMvcConfigurerAdapter组件都会一起起作用
    @Bean //将组件注册在容器
    public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
        WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {
                registry.addViewController("/").setViewName("login");
                registry.addViewController("/index.html").setViewName("login");
                registry.addViewController("/main.html").setViewName("dashboard");
            }

            //注册拦截器
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
                //super.addInterceptors(registry);
                //静态资源;  *.css , *.js
                //SpringBoot已经做好了静态资源映射
                registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")
                        .excludePathPatterns("/index.html","/","/user/login");
            }
        };
        return adapter;
    }

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