Using webmvcconfigurer to intercept interface requests is being enhanced (with source code)

The problem background

Interceptors are often used in projects to intercept requests, print logs, input and output , Introduce to you WebMvcConfigurer Use of interceptors
matters needing attention ：

• You can use the code of the article to create your own project , You can also download the source code for reference

WebMvcConfigurer The interceptor is enhanced

1 Add the configuration class of interceptor

package com.lanran.webmvcconfigurer.config;

import com.lanran.webmvcconfigurer.interceptor.WebInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/** * @Description: * @Created: IDEA2021 * @author:  Blue dye  * @createTime: 2022-07-30 17:57 **/

@Configuration
public class WebConfig implements WebMvcConfigurer {
    

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    
        registry.addInterceptor(new WebInterceptor()) // Register interceptors ,
                .addPathPatterns("/**");  // All requests need to be intercepted 
    }
}

2 Add interceptor

package com.lanran.webmvcconfigurer.interceptor;


import com.lanran.webmvcconfigurer.entity.UserInfoTo;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;



/** * @Description:  Before executing the target method , Judge the user's login status . Is a temporary user , Or login user , And encapsulate and pass it to controller Target request  * @Created: IDEA2021 * @author:  Blue dye  * @createTime: 2022-07-30 17:31 **/
// The interceptor needs to be configured to take effect , Add configuration class GulimallWebConfig implements WebMvcConfigurer
//HandlerInterceptor This is MVC Interceptor , So all of them getmapping and postmapping Will be intercepted 
public class WebInterceptor implements HandlerInterceptor {
    



    /*** *  Before the target method is executed , The target method here  * @param request * @param response * @param handler * @return * @throws Exception */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    

        System.out.println("before");

        return true;
    }


    /** *  After business execution , Assign temporary users to the browser to save  * * @param request * @param response * @param handler * @param modelAndView * @throws Exception */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    

        System.out.println("after");

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    

    }
}

3 Add test interface

package com.lanran.webmvcconfigurer.web;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/** * @Author suolong * @Date 2022/7/22 9:52 * @Version 2.0 */
@RestController
public class WebController {
    



    @GetMapping("/test")
    public String test(){
    
        System.out.println("test method");
        return "success";
    }

}

4 Entity classes used

package com.lanran.webmvcconfigurer.entity;

import lombok.Data;

/** * @Author suolong * @Date 2022/7/22 8:44 * @Version 2.0 */
@Data
public class UserInfoTo {
    

    private String name;

    private String gender;

    private Integer age;

    private Boolean flag;

}

5 Start class

package com.lanran.webmvcconfigurer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WebMvcConfigurerApplication {
    

    public static void main(String[] args) {
    
        SpringApplication.run(WebMvcConfigurerApplication.class, args);
    }

}

6 Project directory

7 Startup items , Use postman Test interface

Log print results

summary

Stop what you want to stop

As a programmer 214 An article , Write one line of lyrics at a time and record , Look at how many songs there are in life ,wahahaha …

Lyric： In the rain with tears