SpringBoot的Web开发

Web开发的自动配置类：org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration

位置:

       

   

  内部使用条件配置:
         @ConditionalOnClass,说明其内部条件是有servlet(说明是一个web工程)、DispatcherSevlet（有SpingMVC）、WebMvcConfigurerAdapter（webMvc适配器），三者是and关系，必须全部都包含。

 

解释

      

@ConditionalOnMissingBean({HiddenHttpMethodFilter.class})

public OrderedHiddenHttpMethodFilter hiddenHttpMethodFilter() {

return new OrderedHiddenHttpMethodFilter();

}

 

@ConditionalOnMissingBean判断是否有这个bean，如果有就正常执行，没有这里创建一个

 

自带自动配置视图解析器：

      

         ViewResolver

                           

其前缀和后缀，在view对象中配置。

 

 

 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（建议把资源放入指定路径中去，一般是放入如下文件下去）：

spring.resources.static-locations=classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/

 

不指定资源位置时，也可访问。

 

 

消息转化器配置：
      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。(两种方法,这里是其一)

                

package com.example.demo;

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.nio.charset.Charset;


@Controller
@SpringBootApplication
@SpringBootConfiguration
public class Application {

    @RequestMapping("hello")
    @ResponseBody
    public String hello() {
        return "hello world!中国最好的人就是我";
    }

    public Application() {
    }

    /**
     * 自定义消息装换器
     *
     * @return
     */
    @Bean
    public StringHttpMessageConverter stringHttpMessageConverter() {
        StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("ISO-8859-1"));
        return converter;
    }


    public static void main(String[] args) {
        SpringApplication springApplication = new SpringApplication(Application.class);
        springApplication.setBannerMode(Banner.Mode.OFF);
        springApplication.run(args);
    }
}

 

SpingBoot配置拦截器

package com.example.demo;
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);
    }

}