07_SpringBoot的web开发

Spring Boot的web开发

在spring-boot-autoconfigure-1.5.2.RELEASE.jar中，
Web开发的自动配置类：org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration

自动配置的ViewResolver

视图的配置mvcProperties对象中：
org.springframework.boot.autoconfigure.web.WebMvcProperties.View

• 在application.prrperties中自定义配置prefix

"NoHandlerFoundException" should be thrown if no Handler was found to process a request.
spring.mvc.view.prefix= # Spring MVC view prefix.
spring.mvc.view.suffix= # Spring MVC view suffix.

自动配置静态资源

• 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/
  

  
  
  
  

  静态资源路径
  
  
  

  浏览器访问路径

• 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：
  

  
  
  
  

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：

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。

package cn.huachao.springboot.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.annotation.Configuration;
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
public class MySpringMVCConfig extends WebMvcConfigurerAdapter{
    @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);
    }

  // 自定义消息转化器的第二种方法
    @Override
    public void configureMessageConverters(List> converters) {
        StringHttpMessageConverter converter  = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        converters.add(converter);
    }
    
}