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Springmvc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

<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

<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：

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

<form action="/upload" method="post" enctype="multipart/form-data"> <input name="pic" type="file"> <input type="submit"> </form>

Controller

@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)

@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。

@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

<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version> </dependency>

配置消息转换器，添加fastjson

@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

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

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

@Override public void addInterceptors(InterceptorRegistry registry) {     registry.addInterceptor(new MyInterceptor())             .addPathPatterns("/**")             .excludePathPatterns("/hello2"); }