1、配置类
实现WebMvcConfigurer 中的addInterceptors接口,注册Interceptor拦截器。
package com.example.demo.Interceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
//注册Interceptor拦截器
InterceptorRegistration registration = registry.addInterceptor(new Interceptor());
//拦截div接口。(/**表示拦截所有请求)
registration.addPathPatterns(
"/div"
);
//添加不拦截路径
registration.excludePathPatterns(
"/**/login", //登录
"/**/*.html", //html静态资源
"/**/*.js", //js静态资源
"/**/*.css", //css静态资源
"/**/*.woff",
"/**/*.ttf"
);
}
}
2、业务类
在拦截器中打印请求信息。
package com.example.demo.Interceptor;
import cn.hutool.json.JSONObject;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Enumeration;
public class Interceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
StringBuilder sb = new StringBuilder(1000);
//获取请求参数
Enumeration em = request.getParameterNames();
JSONObject data = new JSONObject();
while (em.hasMoreElements()) {
String name = (String) em.nextElement();
String value = request.getParameter(name);
data.put(name,value);
}
sb .append("-------------------------------------------------------------\n");
HandlerMethod h = (HandlerMethod) handler;
sb.append("Controller: ").append(h.getBean().getClass().getName()).append("\n");
sb.append("Method : ").append(h.getMethod().getName()).append("\n");
sb.append("Params : ").append(data).append("\n");
sb.append("URI : ").append(request.getRequestURI()).append("\n");
sb.append("URL : ").append(request.getRequestURL()).append("\n");
sb .append("-------------------------------------------------------------\n");
System.out.println(sb.toString());
return true;
}
}
3、测试接口
拦截的就是下面这个div接口。
package com.example.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class InterceptorController {
@GetMapping("/div")
@ResponseBody
public int div(int x,int y ){
return x/y;
}
}
4、控制台测试结果
-------------------------------------------------------------
Controller: com.example.demo.controller.InterceptorController
Method : div
Params : {"x":"2","y":"1"}
URI : /div
URL : http://localhost:81/div
-------------------------------------------------------------