S pringmvc 的自动解管理
中央转发器（DispatcherServlet）
控制器
视图解析器
静态资源访问
消息转换器
格式化
静态资源管理
中央 转发器
Xml无需配置
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| <servlet > <servlet-name >chapter2</servlet-name > <servlet-class >org.springframework.web.servlet.DispatcherServlet</servlet-class > <load-on-startup >1</load-on-startup > </servlet > <servlet-mapping > <servlet-name >chapter2</servlet-name > <url-pattern >/</url-pattern > </servlet-mapping > |
控制器
控制器Controller在springboot的注解扫描范围内自动管理。
视图 解析器 自动 管理
Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans.
ContentNegotiatingViewResolver：组合所有的视图解析器的；
曾经的配置文件无需再配
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| <bean id ="de" class ="org.springframework.web.servlet.view.InternalResourceViewResolver" > <property name ="prefix" value ="/WEB-INF/jsp/" ></property > <property name ="suffix" value ="*.jsp" ></property > </bean > |
源码：
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| public ContentNegotiatingViewResolver viewResolver(BeanFactory beanFactory) { ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver(); resolver.setContentNegotiationManager((ContentNegotiationManager)beanFactory.getBean(ContentNegotiationManager.class )); resolver.setOrder(-2147483648); return resolver; } |
当我们做文件上传的时候我们也会发现multipartResolver 是自动被配置好的
页面
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| <form action= "/upload" method= "post" enctype= "multipart/form-data" > <input name= "pic" type= "file" > <input type= "submit" > </form > |
Controller
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| @ResponseBody @RequestMapping("/upload" ) public String upload(@RequestParam("pic" )MultipartFile file, HttpServletRequest request){ String contentType = file.getContentType(); String fileName = file.getOriginalFilename(); /*System.out.println("fileName-->" + fileName); System.out.println("getContentType-->" + contentType);*/ //String filePath = request.getSession().getServletContext().getRealPath("imgupload/"); String filePath = "D:/imgup / " ; try { this .uploadFile (file.getBytes(), filePath, fileName); } catch (Exception e) { // TODO: handle exception } return "success" ; } public static void uploadFile(byte [] file, String filePath, String fileName) throws Exception { File targetFile = new File(filePath); if (!targetFile.exists()){ targetFile.mkdirs(); } FileOutputStream out = new FileOutputStream(filePath+fileName); out.write(file); out.flush(); out.close(); } |
消息 转换和 格式化
格式化转换器的自动注册
Springboot扩展springmvc
我们可以来通过实现WebMvcConfigurer接口来扩展
在 容器中 注册视图 控制器 ( 请求转发 )
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| @Configuration public class MyMVCCofnig implements WebMvcConfigurer{ @Override public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/tx" ).setViewName("success" ); } } |
注册 格式化器
用来可以对请求过来的日期格式化的字符串来做定制化。当然通过application.properties配置也可以办到。
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| @Override public void addFormatters(FormatterRegistry registry) { registry.addFormatter(new Formatter<Date>() { @Override public String print(Date date, Locale locale) { return null ; } @Override public Date parse(String s, Locale locale) throws ParseException { return new SimpleDateFormat("yyyy-MM-dd" ).parse(s); } }); } |
消息 转换器扩展 fastjson
在pom.xml中引入fastjson
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| <dependency > <groupId >com.alibaba</groupId > <artifactId >fastjson</artifactId > <version >1.2.47</version > </dependency > |
配置消息转换器，添加fastjson
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| @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { FastJsonHttpMessageConverter fc = new FastJsonHttpMessageConverter(); FastJsonConfig fastJsonConfig = new FastJsonConfig(); fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat ); fc.setFastJsonConfig(fastJsonConfig); converters.add(fc); } |
在实体类上可以继续控制
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| public class User { private String username ; private String password ; private int age ; private int score ; private int gender ; @JSONField(format = "yyyy-MM-dd" ) private Date date ; |
拦截器注册
创建拦截器
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| public class MyInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out .println(" 前置拦截 " ); return true ; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out .println(" 后置拦截 " ); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out .println(" 最终拦截 " ); } } |
拦截器注册
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| @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new MyInterceptor()) .addPathPatterns("/**" ) .excludePathPatterns("/hello2" ); } |