Spring5 源码阅读笔记（5）基于注解的方法替换 spring-dispatcher.xml

最新推荐文章于 2023-01-19 21:06:11 发布

原创最新推荐文章于 2023-01-19 21:06:11 发布 · 399 阅读

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本文深入解析了Spring MVC的配置过程，包括使用@EnableWebMvc注解激活MVC功能，配置视图解析器，设置默认Servlet处理及拦截器注册等关键步骤。通过示例代码展示了如何自定义拦截器并应用到特定路径。

示例

@Configuration
@EnableWebMvc
public class AppConfig implements WebMvcConfigurer {

    @Autowired
    private UserInterceptor userInterceptor;

    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        registry.jsp("/WEB-INF/views/", ".jsp");
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(userInterceptor).addPathPatterns("/user/**").excludePathPatterns("/user/query/**");
        registry.addInterceptor(new UserInterceptor1()).addPathPatterns("/user/**").excludePathPatterns("");
        addInterceptors(registry);
    }
}

@EnableWebMvc 干了什么？

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
@Import(DelegatingWebMvcConfiguration.class)
public @interface EnableWebMvc {
}

跟 DelegatingWebMvcConfiguration：
在这里插入图片描述
跟 WebMvcConfigurationSupport：
注入了一些 HandlerMapping，这里面还设置了拦截器

跟 getInterceptors：

protected final Object[] getInterceptors() {
	if (this.interceptors == null) {
		InterceptorRegistry registry = new InterceptorRegistry();
		//模板方法，见示例
		addInterceptors(registry);
		registry.addInterceptor(new ConversionServiceExposingInterceptor(mvcConversionService()));
		registry.addInterceptor(new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider()));
		this.interceptors = registry.getInterceptors();
	}
	return this.interceptors.toArray();
}