spring boot 2.x 拦截器

心已赠人 2022-05-10 01:24 183阅读 0赞

[开发十年，就只剩下这套Java开发体系了 >>> ][Java_ _]  ![hot3.png][]

# 1、spring1.x配置方式 #

在spring boot1.x中，使用拦截器，一般进行如下配置：

@Configuration
    public class AppConfig extends WebMvcConfigurerAdapter {
    	@Resource
    	private FRInterceptor fRInterceptor;
    
    	@Override
    	public void addInterceptors(InterceptorRegistry registry) {
    		//自定义拦截器，添加拦截路径和排除拦截路径 
    		registry.addInterceptor(fRInterceptor).addPathPatterns("api/**").excludePathPatterns("api/login");
    	}
    }

但是在spring boot2.x中，**WebMvcConfigurerAdapter**被deprecated，虽然继承**WebMvcConfigurerAdapter**这个类虽然有此便利，但在Spring5.0里面已经deprecated了。

官方文档也说了，**WebMvcConfigurer**接口现在已经有了默认的空白方法，所以在Springboot2.0（Spring5.0）下更好的做法还是implements**WebMvcConfigurer**。

# 2、spring2.x配置方式 #

## 2.1拦截器统一管理 ##

import javax.annotation.Resource;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import com.spring.pro.interceptor.FileUploadInterceptor;
    
    /**
     * @ClassName: WebConfig
     * @Description:
     * @author weiyb
     * @date 2018年5月7日 上午11:30:58
     */
    @Configuration
    public class WebConfig implements WebMvcConfigurer {
    	@Resource
    	private FileUploadInterceptor fileUploadInterceptor;
    
    	@Override
    	public void addInterceptors(InterceptorRegistry registry) {
    		// 自定义拦截器，添加拦截路径和排除拦截路径
    		registry.addInterceptor(fileUploadInterceptor).addPathPatterns("/**");
    	}
    }

## 2.2自定义拦截器 ##

import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.stereotype.Component;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    /**
     * 文件上传拦截器
     * @ClassName: FileUploadInterceptor
     * @Description:
     * @author weiyb
     * @date 2018年5月7日 上午11:51:53
     */
    @Component
    public class FileUploadInterceptor implements HandlerInterceptor {
    	/*
    	 * 视图渲染之后的操作
    	 */
    	@Override
    	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
    			throws Exception {
    
    	}
    
    	/*
    	 * 处理请求完成后视图渲染之前的处理操作
    	 */
    	@Override
    	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
    			throws Exception {
    
    	}
    
    	/*
    	 * 进入controller层之前拦截请求
    	 */
    	@Override
    	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception {
    		System.out.println("getContextPath:" + request.getContextPath());
    		System.out.println("getServletPath:" + request.getServletPath());
    		System.out.println("getRequestURI:" + request.getRequestURI());
    		System.out.println("getRequestURL:" + request.getRequestURL());
    		System.out.println("getRealPath:" + request.getSession().getServletContext().getRealPath("image"));
    		return true;
    	}
    
    }

[Java_ _]: https://my.oschina.net/u/3779583/blog/1862418
[hot3.png]: /images/20220510/b39aa6b539704a7c9f493d3cbd1dec58.png