Spring Boot拦截器实现步骤及测试实例

第一步，定义拦截器：

package com.zl.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 myInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println('preHandle'); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println('preHandle'); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println('preHandle'); }}

控制台打印三个输出语句，作为测试。

第二步：配置拦截器

package com.zl.interceptor;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.WebMvcConfigurer;@Configurationpublic class WebMVCConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(myInterceptor()).addPathPatterns('/**'); } @Bean myInterceptor myInterceptor(){ return new myInterceptor(); }}

将定义的拦截器注入到这个配置方法中，并拦截所有路径。

第三步：写个接口测试

package com.zl.interceptor;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class helloController { @GetMapping('/hello') public String hello(){ return 'hello'; }}

测试结果

定义的拦截器三个方法都执行了。

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