SpringBoot的Web开发 | 易学教程

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)

 1 package com.example.demo;
 2 
 3 import org.springframework.boot.Banner;
 4 import org.springframework.boot.SpringApplication;
 5 import org.springframework.boot.SpringBootConfiguration;
 6 import org.springframework.boot.autoconfigure.SpringBootApplication;
 7 import org.springframework.context.annotation.Bean;
 8 import org.springframework.http.converter.StringHttpMessageConverter;
 9 import org.springframework.stereotype.Controller;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.bind.annotation.ResponseBody;
12 
13 import java.nio.charset.Charset;
14 
15 
16 @Controller
17 @SpringBootApplication
18 @SpringBootConfiguration
19 public class Application {
20 
21     @RequestMapping("hello")
22     @ResponseBody
23     public String hello() {
24         return "hello world!中国最好的人就是我";
25     }
26 
27     public Application() {
28     }
29 
30     /**
31      * 自定义消息装换器
32      *
33      * @return
34      */
35     @Bean
36     public StringHttpMessageConverter stringHttpMessageConverter() {
37         StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("ISO-8859-1"));
38         return converter;
39     }
40 
41 
42     public static void main(String[] args) {
43         SpringApplication springApplication = new SpringApplication(Application.class);
44         springApplication.setBannerMode(Banner.Mode.OFF);
45         springApplication.run(args);
46     }
47 }

View Code

SpingBoot配置拦截器

 1 package com.example.demo;
 2 import java.nio.charset.Charset;
 3 import java.util.List;
 4 
 5 import javax.servlet.http.HttpServletRequest;
 6 import javax.servlet.http.HttpServletResponse;
 7 
 8 import org.springframework.context.annotation.Configuration;
 9 import org.springframework.http.converter.HttpMessageConverter;
10 import org.springframework.http.converter.StringHttpMessageConverter;
11 import org.springframework.web.servlet.HandlerInterceptor;
12 import org.springframework.web.servlet.ModelAndView;
13 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
14 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
15 
16 @Configuration //申明这是一个配置
17 public class MySrpingMVCConfig extends WebMvcConfigurerAdapter{
18 
19     // 自定义拦截器
20     @Override
21     public void addInterceptors(InterceptorRegistry registry) {
22         HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
23             @Override
24             public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
25                     throws Exception {
26                 System.out.println("自定义拦截器............");
27                 return true;
28             }
29             
30             @Override
31             public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
32                     ModelAndView modelAndView) throws Exception {
33                 
34             }
35             
36             @Override
37             public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
38                     Exception ex) throws Exception {
39             }
40         };
41         registry.addInterceptor(handlerInterceptor).addPathPatterns("/**");
42     }
43 
44     // 自定义消息转化器的第二种方法
45     @Override
46     public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
47         StringHttpMessageConverter converter  = new StringHttpMessageConverter(Charset.forName("UTF-8"));
48         converters.add(converter);
49     }
50 
51 }

View Code

来源：https://www.cnblogs.com/liuyangfirst/p/8729455.html

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