Springboot引入拦截器并放行swagger代码实例

这篇文章主要介绍了Springboot引入拦截器并放行swagger代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

Springboot引入拦截器

自定义的拦截器类 Interceptor

package cn.zytao.taosir.auth.config;

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

public class AuthInterceptor implements HandlerInterceptor{
  
  /**
   * 请求处理之后
   */
  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
      throws Exception {
    // TODO Auto-generated method stub
    HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
  }

  /**
   * 请求处理之后调用
   */
  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
      ModelAndView modelAndView) throws Exception {
    // TODO Auto-generated method stub
    HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
  }

  /**
   * 请求处理之前
   */
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
      throws Exception {
    return HandlerInterceptor.super.preHandle(request, response, handler);
  }
}

将拦截器添加到springmvc配置中，并放行swagger的相关资源

package cn.zytao.taosir.auth.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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
public class SpringMVCConfig extends WebMvcConfigurationSupport{
  @Bean
  public AuthInterceptor getAuthInterceptor() {
    return new AuthInterceptor();
  }
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    registry
    .addInterceptor(getAuthInterceptor())
    .addPathPatterns("/**")
    .excludePathPatterns("/login")
    .excludePathPatterns("/swagger-resources/**", "/webjars/**", "/v2/**", "/swagger-ui.html/**");
    super.addInterceptors(registry);
  }
  @Override
  protected void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("swagger-ui.html")
    .addResourceLocations("classpath:/META-INF/resources/");
    registry.addResourceHandler("/webjars/**")
    .addResourceLocations("classpath:/META-INF/resources/webjars/");
    super.addResourceHandlers(registry);
  }
}

在addInterceptors方法中添加拦截器时，是new的一个拦截器。而并不是引入springBean容器初始化时，已经初始化好了的bean实例，并不是同一个对象，故而访问时肯定是无法引入Interceptor类里面引入的bean实例，可能产生空指针异常。

即无法引入默认注入的Bean，那么我们就自己定义一个Bean，然后在拦截器添加方法内引入这个bean即可，上面主要对此进行了处理。

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自由互联。