spring boot如何添加拦截器
作者:Ryan.Miao
本篇文章主要介绍了spring boot如何添加拦截器,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧
构建一个spring boot项目。
添加拦截器需要添加一个configuration
@Configuration @ComponentScan(basePackageClasses = Application.class, useDefaultFilters = true) public class ServletContextConfig extends WebMvcConfigurationSupport {
为了方便扫描位置,我们可以写一个接口或者入口类Application放置于最外一层的包内,这样就会扫描该类以及子包的类。
1 resources配置
在没有配置这个类的时候,我们可以在application.ym中修改静态文件位置和匹配方式:
#指定环境配置文件 spring: profiles: active: dev # 修改默认静态路径,默认为/**,当配置hello.config.ServletContextConfig后此处配置失效 mvc: static-path-pattern: /static/**
但当我们继承了WebMvcConfigurationSupport 并配置扫描后,上述resources的配置失效,还原默认配置。那么我们需要在这个类中再次指定静态资源位置:
@Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/").addResourceLocations("/**"); registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/"); }
这样访问classpath下的static包下的静态资源的url匹配为/static/xxx.js。默认匹配static下的静态文件url为/xxx.js,虽然清洁,但我感觉idea不会识别这种路径,还是改成完整的路径比较好。
2.Interceptor配置
配置登录拦截或者别的。需要创建一个拦截器类来继承HandlerInterceptorAdapter,然后只需要覆盖你想要拦截的位置就可以了。比如,我只是拦截访问方法之前:
package hello.interceptor; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Created by miaorf on 2016/8/3. */ public class LoginInterceptor extends HandlerInterceptorAdapter { private Logger logger = LoggerFactory.getLogger(LoginInterceptor.class); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String authorization = request.getHeader("Authorization"); logger.info("The authorization is: {}",authorization); return super.preHandle(request, response, handler); } }
写好interceptor之后需要在开始创建的ServletContextConfig中添加这个拦截器:
@Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new LoginInterceptor()) .addPathPatterns("/**") .excludePathPatterns(FAVICON_URL) ; }
完整的ServletContextConfig为:
package hello.config; import hello.Application; import hello.interceptor.LoginInterceptor; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport; /** * */ @Configuration @ComponentScan(basePackageClasses = Application.class, useDefaultFilters = true) public class ServletContextConfig extends WebMvcConfigurationSupport { static final private String FAVICON_URL = "/favicon.ico"; static final private String PROPERTY_APP_ENV = "application.environment"; static final private String PROPERTY_DEFAULT_ENV = "dev"; /** * 发现如果继承了WebMvcConfigurationSupport,则在yml中配置的相关内容会失效。 * @param registry */ @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/").addResourceLocations("/**"); registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/"); } /** * 配置servlet处理 */ @Override public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) { configurer.enable(); } @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new LoginInterceptor()) .addPathPatterns("/**") .excludePathPatterns(FAVICON_URL) ; } }
github地址:https://github.com/chenxing12/spring-boot-demo
本demo源码:spring-boot-demo_jb51.rar
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。