本篇内容主要讲解“spring boot动态生成接口怎么实现”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“spring boot动态生成接口怎么实现”吧!
在某些业务场景中，我们只需要业务代码中定义相应的接口或者相应的注解，并不需要实现对应的逻辑。
比如 mybatis和feign： 在 mybatis 中，我们只需要定义对应的mapper接口；在 feign 中，我们只需要定义对应业务系统中的接口即可。
那么在这种场景下，具体的业务逻辑时怎么执行的呢，其实原理都是动态代理。
我们这里不具体介绍动态代理，主要看一下它在springboot项目中的实际应用，下面我们模仿feign来实现一个调用三方接口的 httpclient。
一: 定义注解
package com.mysgk.blogdemo.annotation;public @interface MyHttpClient {}二: 建立动态代理类
package com.mysgk.blogdemo.proxy;import org.springframework.beans.factory.FactoryBean;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;public class RibbonAopProxyFactory<T> implements FactoryBean<T>, InvocationHandler {private Class<T> interfaceClass;public Class<T> getInterfaceClass() {return interfaceClass;}public void setInterfaceClass(Class<T> interfaceClass) {this.interfaceClass = interfaceClass;}@Overridepublic T getObject() throws Exception {return (T) Proxy.newProxyInstance(this.getClass().getClassLoader(), new Class[]{interfaceClass}, this);}@Overridepublic Class<?> getObjectType() {return interfaceClass;}@Overridepublic boolean isSingleton() {return true;}@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {return "invoke " + proxy.getClass().getName() + "." + method.getName() + " , do anything ..";}}三: 注入spring容器
package com.mysgk.blogdemo.start;import cn.hutool.core.util.ClassUtil;import cn.hutool.core.util.StrUtil;import com.mysgk.blogdemo.annotation.MyHttpClient;import com.mysgk.blogdemo.proxy.RibbonAopProxyFactory;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.BeansException;import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;import org.springframework.beans.factory.support.BeanDefinitionBuilder;import org.springframework.beans.factory.support.BeanDefinitionRegistry;import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;import org.springframework.beans.factory.support.GenericBeanDefinition;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.stereotype.Component;import java.util.Set;@Componentpublic class ScanHttpClients implements BeanDefinitionRegistryPostProcessor, ApplicationContextAware {private final Logger logger = LoggerFactory.getLogger(ScanHttpClients.class);private ApplicationContext ctx;public void run(BeanDefinitionRegistry registry) {Set<Class<?>> scanPackage = ClassUtil.scanPackageByAnnotation("com.mysgk", MyHttpClient.class);for (Class<?> cls : scanPackage) {BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(cls);GenericBeanDefinition definition = (GenericBeanDefinition) builder.getRawBeanDefinition();definition.getPropertyValues().add("interfaceClass", definition.getBeanClassName());definition.setBeanClass(RibbonAopProxyFactory.class);definition.setAutowireMode(GenericBeanDefinition.AUTOWIRE_BY_TYPE);String beanName = StrUtil.removePreAndLowerFirst(cls.getSimpleName(), 0) + "RibbonClient";registry.registerBeanDefinition(beanName, definition);}}@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {run(registry);}@Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {}@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.ctx = ctx;}}四: 编写拦截器
package com.mysgk.blogdemo.aop;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpEntity;import org.springframework.http.HttpMethod;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Component;import org.springframework.web.client.RestTemplate;@Component@Aspectpublic class InterceptAnnotation {@Autowiredprivate RestTemplate ribbonLoadBalanced;@Pointcut("@annotation(com.mysgk.blogdemo.annotation.MyHttpClient)")public void execute() {}@Around("execute()")public Object interceptAnnotation(ProceedingJoinPoint joinPoint) throws Throwable {ResponseEntity<?> exchange = ribbonLoadBalanced.exchange("url", HttpMethod.GET, HttpEntity.EMPTY, Object.class);return exchange.getBody();}}五: 新建测试类
package com.mysgk.blogdemo.client;import com.mysgk.blogdemo.annotation.MyHttpClient;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestBody;@MyHttpClientpublic interface MyHttpClientTest {@PostMapping(value = "test/t1")Object test(String param);}项目结构：
到此，相信大家对“spring boot动态生成接口怎么实现”有了更深的了解，不妨来实际操作一番吧！这里是编程网网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
