## 1. Spring Boot的web开发 Web开发的自动配置类：org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration ### 1.1 自动配置的ViewResolver  视图的配置mvcProperties对象中： org.springframework.boot.autoconfigure.web.WebMvcProperties.View  ### 1.2 自动配置静态资源 1. 进入规则为 / 如果进入SpringMVC的规则为/时，Spring Boot的默认静态资源的路径为： spring.resources.static-locations=classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/  测试：   ### 1.3 进入规则为*.xxx 或者 不指定静态文件路径时 将静态资源放置到webapp下的static目录中即可通过地址访问：  测试： ### 1.4 自定义消息转化器 自定义消息转化器，只需要在@Configuration的类中添加消息转化器的@bean加入到Spring容器，就会被Spring Boot自动加入到容器中。 ~~~ ~~~ @Bean public StringHttpMessageConverter stringHttpMessageConverter(){ StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("UTF-8")); return converter; ~~~ ~~~ 默认配置： ### 1.5 自定义SpringMVC的配置 有些时候我们需要自已配置SpringMVC而不是采用默认，比如说增加一个拦截器，这个时候就得通过继承WebMvcConfigurerAdapter然后重写父类中的方法进行扩展。 ~~~ import java.nio.charset.Charset; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.context.annotation.Configuration; import org.springframework.http.converter.HttpMessageConverter; import org.springframework.http.converter.StringHttpMessageConverter; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; @Configuration //申明这是一个配置 public class MySrpingMVCConfig extends WebMvcConfigurerAdapter{ // 自定义拦截器 @Override public void addInterceptors(InterceptorRegistry registry) { HandlerInterceptor handlerInterceptor = new HandlerInterceptor() { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("自定义拦截器............"); 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 { } }; registry.addInterceptor(handlerInterceptor).addPathPatterns("/**"); } // 自定义消息转化器的第二种方法 @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("UTF-8")); converters.add(converter); } } ~~~ ## 2. 自定义  1. HelloApplication ~~~ @Controller @SpringBootApplication(exclude = { RedisAutoConfiguration.class }) //@ComponentScan(basePackages={"cn.itcast.springboot.javaconfig"}) 默认扫描与应用同级的目录和这个目录的子目录，此时MySpringMVCConfig类配置，就不起作用了 @Configuration public class HelloApplication { @RequestMapping("hello") @ResponseBody public String hello() { return "hello world！ 传智播客！"; } //自定义消息转换器 @Bean public StringHttpMessageConverter stringHttpMessageConverter() { StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("ISO-8859-1")); return converter; } public static void main(String[] args) { // SpringApplication.run(HelloApplication.class, args); SpringApplication application = new SpringApplication(HelloApplication.class); application.setBannerMode(Mode.OFF); application.run(args); } } ~~~ 2. 自定义类 ~~~ @Configuration //申明这是一个配置，和HelloApplication在同一个目录下，所有配置会被扫描 public class MySrpingMVCConfig extends WebMvcConfigurerAdapter{ // 自定义拦截器 @Override public void addInterceptors(InterceptorRegistry registry) { HandlerInterceptor handlerInterceptor = new HandlerInterceptor() { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("自定义拦截器............"); 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 { } }; registry.addInterceptor(handlerInterceptor).addPathPatterns("/**"); } // 自定义消息转化器的第二种方法 @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("UTF-8")); converters.add(converter); } } ~~~