Springboot customizes a simple interceptor

Many times we need to customize an interceptor to intercept some requests, so how to customize an interceptor in springboot?

1. Create a new springboot project (omitted)

Project structure:

2. Import the corresponding dependencies

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.example</groupId>
   <artifactId>demo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>demo   

</name>
   <description>Demo project for Spring Boot</description>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.0.1.RELEASE</version>
      <relativePath/>
   </parent>
   <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
      <java.version>1.8</java.version>
   </properties>



   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-thymeleaf</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <optional>true</optional>

         <scope>true</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
               <fork>true</fork>

            </configuration>
         </plugin>
      </plugins>
   </build>


</project>

3、在com.example下新建controller 和 interceptor 两个包在两个包下分别新建 TestController.java 和 SpringInterceptor.java两个类

4、编写代码

TestController.java

package com.example.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class TestController {
    @RequestMapping("/index")
    public String hello (){
        return "index";
    }
}

SpringInterceptor.java

package com.example.Interceptor;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Configuration
public class SpringInterceptor extends WebMvcConfigurationSupport {
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
            @Override
            public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
                System.out.println("自定义拦截器执行了。。。。。");
                return true;
            }
        };
        registry.addInterceptor(handlerInterceptor).addPathPatterns("/**");
    }


}

5、测试一下效果在resources/templates下新建一个index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
</head>
<body>
    I'm a test !!!
</body>
</html>

运行 :

到这里一个自定义拦截器就完成了！

Springboot customizes a simple interceptor

Guess you like