spring boot 三大特性
- 组件自动装配： web mvc、web flux、jdbc等
- 嵌入式web容器：tomcat、jetty以及undertow等
- 生产准备特性：指标、健康检查、外部配置等
组件的自动装配
- 激活：@EnableAutoConfiguration
- 配置：/META-INF/spring.factories
- 实现：XXXAutoConfiguration
传统web
支持jsp
添加依赖
<!-- 支持jsp -->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>9.0.0.M15</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
配置文件
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
直接编写cotroller及路由，便可以访问对应的jsp页面
fastjson解析返回数据
@Configuration
public class FastJsonConfigInfo implements WebMvcConfigurer{
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
converter.setFastJsonConfig(fastJsonConfig);
converters.add(converter);
}
}
拦截器
- 自定义拦截器
public class CustomerInterceptor implements HandlerInterceptor {
private final Logger logger = LoggerFactory.getLogger(CustomerInterceptor.class);
/**
* 针对那些情况做拦截:
* false则不处理，直接返回。
* true 交给对应的handler处理
* @param request
* @param response
* @param handler
* @return
* @throws Exception
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
String path = request.getServletPath();
logger.info("request of path is {}",path);
if("/indexJson".equals(path)){
return true;
}
return false;
}
/**
* handler 执行之前处理，数据校验等
* @param request
* @param response
* @param handler
* @param modelAndView
* @throws Exception
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
@Nullable ModelAndView modelAndView) throws Exception {
Map<String,String[]> params = request.getParameterMap();
logger.info("request params info is {}",JSONObject.toJSONString(params));
logger.info("{}",handler.getClass().getName());
}
/**
* hanler 处理完成之后
* @param request
* @param response
* @param handler
* @param ex
* @throws Exception
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
@Nullable Exception ex) throws Exception {
logger.error("the request is exception,the exception info is",ex);
}
}
- 将自定义的拦截器注册到容器中
@Configuration
public class FastJsonConfigInfo implements WebMvcConfigurer{
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
converter.setFastJsonConfig(fastJsonConfig);
converters.add(converter);
}
/**
将自定义的拦截器注册到容器中
***/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new CustomerInterceptor()).addPathPatterns("/**");
}
}
spring framework 手动装配
spring模式注解装配
定义：一种用于声明在应用中扮演“组件”角色的注解，例如：@Component、@Service、@Configuration等。 装配：context:component-scan或@ComponentScan
