Spring Boot的web開發(fā)

在spring-boot-autoconfigure-1.5.2.RELEASE.jar中，
Web開發(fā)的自動配置類：org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration

自動配置的ViewResolver

• 在application.prrperties中自定義配置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.

自動配置靜態(tài)資源

• 進入規(guī)則為 /
  如果進入SpringMVC的規(guī)則為/時，Spring Boot的默認靜態(tài)資源的路徑為：
  spring.resources.static-locations=classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/
  

  
  
  靜態(tài)資源路徑
  
  
  瀏覽器訪問路徑

• 進入規(guī)則為*.xxx 或者 不指定靜態(tài)文件路徑時
  將靜態(tài)資源放置到webapp下的static目錄中即可通過地址訪問：
  

  
  

自定義消息轉化器

自定義消息轉化器，只需要在@Configuration的類中添加消息轉化器的@bean加入到Spring容器，就會被Spring Boot自動加入到容器中。

    @Bean
    public StringHttpMessageConverter stringHttpMessageConverter(){
        StringHttpMessageConverter converter  = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        return converter;
    }

默認配置：

自定義SpringMVC的配置

有些時候我們需要自已配置SpringMVC而不是采用默認，比如說增加一個攔截器，這個時候就得通過繼承WebMvcConfigurerAdapter然后重寫父類中的方法進行擴展。

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("自定義攔截器............");
                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);
    }

  // 自定義消息轉化器的第二種方法
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        StringHttpMessageConverter converter  = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        converters.add(converter);
    }
    
}