SpringBoot-扩展SpringMvc

注册视图控制器：

package com.wange.configuration;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class ViewConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/book/form").setViewName("book/book_form");
    }
}

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 如果访问的这个页面没有任何逻辑，只是展示，这样的页面就不需要写空的控制器去响应这个请求了。

格式化控制器参数：

@Override
public void addFormatters(FormatterRegistry registry) {
    registry.addFormatter(new Formatter<Date>() {

        @Override
        public String print(Date object, Locale locale) {
            return null;
        }

        @Override
        public Date parse(String text, Locale locale) throws ParseException {
            return new SimpleDateFormat("yyyy-MM-dd").parse(text);
        }
    });
}

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这时控制器上就可以使用Date类型来接受前端传递日期类型参数了。

消息转换器扩展：

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    FastJsonHttpMessageConverter fc = new FastJsonHttpMessageConverter();
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
    fc.setFastJsonConfig(fastJsonConfig);
    converters.add(fc);
}

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拦截器注册：

package com.wange.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("前置拦截");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("后置拦截");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("最终拦截");
    }
}

// 注册拦截器
@Configuration
public class ViewConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new TestInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/book/exclude1");
    }
}

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