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springboot_interceptor
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‎springboot_interceptor/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>springboot_chowder</artifactId>
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<groupId>com.oven</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>springboot_interceptor</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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</project>

‎springboot_interceptor/readme.md‎

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# springboot炖interceptor
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### 1. 先睹为快
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### 2. 实现原理
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#### 2.1 新建项目
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#### 2.2 创建maven目录结构，以及pom.xml文件
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#### 2.3 pom.xml文件中加入依赖
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```xml
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.0.5.RELEASE</version>
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<relativePath/>
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</parent>
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```
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#### 2.4 pom.xml文件中加入springboot-starter依赖
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```xml
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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```
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#### 2.5 pom.xml文件中加入maven-springboot打包插件
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```xml
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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```
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#### 2.6 开发启动类
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```java
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}
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```
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#### 2.7 开发测试接口
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```java
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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@RestController
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public class DemoController {
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@RequestMapping("/test")
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public Object test(String name) {
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return "hello " + name;
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}
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@RequestMapping("/test2")
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public Object test2(String name) {
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return "hello " + name;
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}
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}
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```
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#### 2.8 开发拦截器
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```java
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import org.springframework.stereotype.Component;
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import org.springframework.web.servlet.HandlerInterceptor;
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import org.springframework.web.servlet.ModelAndView;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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@Component
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public class MyInterceptor implements HandlerInterceptor {
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@Override
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public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
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System.out.println("调用接口之前。。。");
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String name = request.getParameter("name");
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return "Oven".equals(name);
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}
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@Override
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public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
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System.out.println("调用接口之后。。。");
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}
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@Override
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public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
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System.out.println("请求处理完之后。。。");
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}
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}
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```
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#### 2.9 开发拦截器配置
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```java
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import com.oven.interceptor.MyInterceptor;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
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import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
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import javax.annotation.Resource;
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@Configuration
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public class InterceptorConfig implements WebMvcConfigurer {
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@Resource
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private MyInterceptor interceptor;
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@Override
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public void addInterceptors(InterceptorRegistry registry) {
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InterceptorRegistration registration = registry.addInterceptor(interceptor);
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registration.addPathPatterns("/test/**");
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}
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}
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```
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#### 2.10 编译打包运行
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### 3. 应用场景

‎springboot_interceptor/src/main/java/com/oven/Application.java‎

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package com.oven;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}

‎springboot_interceptor/src/main/java/com/oven/config/InterceptorConfig.java‎

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package com.oven.config;
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import com.oven.interceptor.MyInterceptor;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
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import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
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import javax.annotation.Resource;
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@Configuration
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public class InterceptorConfig implements WebMvcConfigurer {
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@Resource
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private MyInterceptor interceptor;
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@Override
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public void addInterceptors(InterceptorRegistry registry) {
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InterceptorRegistration registration = registry.addInterceptor(interceptor);
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registration.addPathPatterns("/test/**");
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}
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}

‎springboot_interceptor/src/main/java/com/oven/controller/DemoController.java‎

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package com.oven.controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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@RestController
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public class DemoController {
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@RequestMapping("/test")
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public Object test(String name) {
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return "hello " + name;
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}
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@RequestMapping("/test2")
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public Object test2(String name) {
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return "hello " + name;
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}
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}

‎springboot_interceptor/src/main/java/com/oven/interceptor/MyInterceptor.java‎

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package com.oven.interceptor;
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import org.springframework.stereotype.Component;
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import org.springframework.web.servlet.HandlerInterceptor;
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import org.springframework.web.servlet.ModelAndView;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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@Component
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public class MyInterceptor implements HandlerInterceptor {
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@Override
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public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
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System.out.println("调用接口之前。。。");
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String name = request.getParameter("name");
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return "Oven".equals(name);
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}
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@Override
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public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
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System.out.println("调用接口之后。。。");
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}
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@Override
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public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
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System.out.println("请求处理完之后。。。");
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}
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}

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