{"id":1153,"date":"2023-05-28T02:28:30","date_gmt":"2023-05-27T18:28:30","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=1153"},"modified":"2023-05-28T02:28:30","modified_gmt":"2023-05-27T18:28:30","slug":"%e5%88%a9%e7%94%a8spring%e6%89%a9%e5%b1%95%e7%82%b9%e6%a8%a1%e6%8b%9ffeign%e5%ae%9e%e7%8e%b0%e8%bf%9c%e7%a8%8b%e8%b0%83%e7%94%a8","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/spring\/%e5%88%a9%e7%94%a8spring%e6%89%a9%e5%b1%95%e7%82%b9%e6%a8%a1%e6%8b%9ffeign%e5%ae%9e%e7%8e%b0%e8%bf%9c%e7%a8%8b%e8%b0%83%e7%94%a8\/","title":{"rendered":"\u5229\u7528Spring\u6269\u5c55\u70b9\u6a21\u62dfFeign\u5b9e\u73b0\u8fdc\u7a0b\u8c03\u7528"},"content":{"rendered":"
\n
<\/mp-common-profile><\/section>\n

\u4e00\u3001\u601d\u8def\u4e0e\u7f16\u7801\u5206\u6790<\/span><\/span><\/span><\/p>\n

\u4e00\u822c\uff0c\u6211\u4eec\u4f1a\u8fd9\u4e48\u4f7f\u7528Feign\uff1a<\/span><\/span><\/span><\/p>\n

\u53ef\u4ee5\u770b\u5230\u8fd9\u91cc\u662f\u4e00\u4e2ainterface\uff08\u63a5\u53e3\uff09\uff0c\u4e5f\u5c31\u662f\u6ca1\u6709\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\u3002<\/span><\/span><\/span><\/p>\n

\u90a3\u4e48\u77e5\u9053\u5bf9\u4e8e\u63a5\u53e3\u662f\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5new\u7684\uff0c\u90a3\u4e48Spring\u4e5f\u5c31\u65e0\u6cd5\u83b7\u53d6\u5230\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\uff0c\u7136\u540e\u8fdb\u884c\u6ce8\u5165\uff0c\u653e\u5230IOC\u5bb9\u5668\u4e2d\u3002<\/span><\/span><\/span><\/p>\n


<\/p>\n

\u601d\u80031\uff1a\u63a5\u53e3\u6ca1\u6709\u5b9e\u73b0\u7c7b\uff1f<\/span><\/span><\/span><\/p>\n

\u8fd9\u91cc\u6211\u4eec\u5c31\u8981\u601d\u8003\uff0c\u53ea\u6709\u63a5\u53e3\uff0c\u6ca1\u6709\u5b9e\u73b0\u7c7b\u7684\u8bdd\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e00\u822c\u8981\u600e\u4e48\u641e\uff1f<\/span><\/span><\/span><\/p>\n

\u4e00\u79cd\u601d\u8def\u5c31\u662f\u52a8\u6001\u4ee3\u7406\uff0c\u5bf9\u4e8e<\/span>\u52a8\u6001\u4ee3\u7406<\/span>\u90fd\u53ef\u4ee5\u628a\u4e00\u4e9b\u529f\u80fd\u901a\u7528\u5316\u3002\u5927\u90e8\u5206\u7684\u6846\u67b6\u4e5f\u662f\u8fd9\u4e48\u5b9e\u73b0\u7684\uff0c\u6bd4\u5982Feign\uff0c\u8fd8\u6709MyBatis\u7684\u6ce8\u89e3\u7f16\u7a0b\u3002<\/span><\/span><\/span><\/p>\n


<\/p>\n

\u601d\u80032\uff1a\u63a5\u53e3\u600e\u4e48\u626b\u63cf\u4ee5\u53ca\u5982\u4f55\u6ce8\u5165\uff1f<\/span><\/span><\/span><\/p>\n

\u5f53\u4f7f\u7528\u6ce8\u89e3\u7f16\u5199\u4e86\u63a5\u53e3\u4e4b\u540e\uff0c\u90a3\u4e48\u8fd9\u4e2a\u63a5\u53e3\u662f\u5982\u4f55\u88ab\u626b\u63cf\u4ee5\u53ca\u5982\u4f55\u88ab\u6ce8\u5165\u7684\u5462\uff1f<\/span><\/span><\/span><\/p>\n

\u5bf9\u4e8e\u626b\u63cf\u7684\u8bdd\uff0c\u4e00\u822c\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a<\/span><\/span><\/span><\/p>\n

\uff081\uff09\u5176\u4e00\u5c31\u662f\u76f4\u63a5\u5728\u63a5\u53e3\u4e0a\u6709\u4e00\u4e2a\u6ce8\u89e3\uff0c\u6bd4\u5982Mybatis\u5c31\u662f\u4f7f\u7528\u4e86\u6ce8\u89e3@Mapper\u3002<\/span><\/span><\/span><\/p>\n

\uff082\uff09\u5176\u4e8c\u5168\u5c40\u6ce8\u89e3\u63a5\u53e3\u5305\u626b\u63cf\uff0c\u6bd4\u5982Mybatis\u4f7f\u7528\u4e86@MapperScan<\/span><\/span><\/span><\/p>\n

\u90a3\u4e48\u8fd9\u4e9b\u7c7b\u662f\u5982\u4f55\u88ab\u6ce8\u5165\u5462\uff1f<\/span><\/span><\/span><\/p>\n

\u8fd9\u91cc\u5f88\u660e\u663e\u5c31\u9700\u8981\u4f7f\u7528\u5230Spring\u7684\u4e00\u4e9b\u6269\u5c55\u70b9\u4e86\uff0c\u6bd4\u5982\uff1a\u5bfc\u5165bean\u5b9a\u4e49\u4ee5\u53ca\u5de5\u5382bean\uff1a<\/span><\/span><\/span><\/p>\n

\uff081\uff09
ImportBeanDefinitionRegistrar\uff1a\u4f7f\u7528import\u7684\u65b9\u5f0f\u6ce8\u518cbean\u5b9a\u4e49\uff0c\u5728\u8fd9\u91cc\u4f1a\u83b7\u53d6\u5230\u6240\u6709\u6ce8\u89e3\u4e86@FeignClient\u6ce8\u89e3\u7684\u63a5\u53e3\uff0c\u83b7\u53d6\u6784\u5efabean\u5b9a\u4e49\u4fe1\u606f\uff0c\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\u5462\uff1f\u4f7f\u7528\u52a8\u6001\u4ee3\u7406\u8fdb\u884c\u5b9e\u73b0\u3002<\/span><\/span><\/span><\/p>\n

\uff082\uff09FactoryBean\uff1a\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\u5b9e\u73b0\u4e86\u63a5\u53e3FactoryBean\uff0c\u5728\u8fd9\u91cc\u4f1a\u8fd4\u56de\u6784\u9020\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5f53\u7136\u662f\u4ee3\u7406\u5bf9\u8c61\u3002<\/span><\/span><\/span><\/p>\n


<\/p>\n

\u7f16\u7801\u5206\u6790<\/span><\/span><\/span><\/p>\n

\u5728\u7f16\u7801\u5206\u6790\u4e4b\u524d\uff0c\u6211\u4eec\u770b\u4e0b\u6700\u540e\u7684\u4e00\u4e2a\u4ee3\u7801\u7ed3\u6784\uff1a<\/span><\/span><\/span><\/p>\n

\uff081\uff09\u6ce8\u89e3<\/span>EnableFeignClients<\/span>\uff1a\u542f\u7528FeignClient\u4ee5\u53ca\u6307\u5b9a\u8981\u626b\u63cf\u7684@FeignClient\u7684\u5305\u8def\u5f84\u3002\u5728\u8fd9\u4e2a\u6ce8\u89e3\u4e0a\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u6ce8\u89e3@Imort\u5bfc\u5165\u4e00\u4e2a\u7c7bFeignClientsRegistrar\u3002<\/span><\/span><\/span><\/p>\n

\uff082\uff09<\/span>FeignClientsRegistrar<\/span>\uff1a\u5b9e\u73b0\u63a5\u53e3
ImportBeanDefinitionRegistrar\uff0c\u4e3b\u8981\u662f\u83b7\u53d6\u6ce8\u89e3EnableFeignClients\u7684\u5305\u4fe1\u606f\uff0c\u7136\u540e\u626b\u63cf\u8be5\u5305\u4e0b\u6ce8\u89e3\u4e86@FeiClient\u7684\u63a5\u53e3\u4fe1\u606f\uff0c\u5e76\u4e14\u6dfb\u52a0bean\u5b9a\u4e49\uff0c\u4ee5\u53ca\u6307\u5b9a\u5177\u4f53\u7684\u5b9e\u73b0\u7c7bFeignFactoryBean\u3002<\/span><\/span><\/span><\/span><\/p>\n

\uff083\uff09<\/span>FeignFactoryBean<\/span>\uff1a@FeignClient\u6ce8\u89e3\u7684\u63a5\u53e3\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\u3002<\/span><\/span><\/span><\/p>\n

\uff084\uff09\u6ce8\u89e3<\/span>FeignMethod<\/span>\uff1a\u7528\u4e8e\u6ce8\u89e3\u8bf7\u6c42\u7684\u63a5\u53e3\u4fe1\u606f\u3002<\/span><\/span><\/span><\/p>\n


<\/p>\n

\u4e8c\u3001\u6a21\u62dfFeignClient\u7684\u5b9e\u73b0<\/span><\/span><\/span><\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6a21\u62dfFeignClient\u6765\u770b\u770b\uff0c\u4f46\u8fd9\u91cc\u8fd8\u662f\u6709\u4e00\u4e9b\u533a\u522b\uff0c\u8fd9\u91cc\u7684\u5173\u952e\u662f\u6211\u4eec\u8981\u5b66\u4e60\u4e00\u4e0b\uff0c\u5982\u4f55\u4f7f\u7528Spring\u7684\u6269\u5c55\u70b9\uff0c\u5728\u5b9e\u9645\u7684\u9879\u76ee\u4e2d\u8fdb\u884c\u4f7f\u7528\u3002\u5f88\u591a\u5f00\u6e90\u7684\u6846\u67b6\u90fd\u662f\u5229\u7528\u4e86Spring\u7684\u6269\u5c55\u70b9\u8fdb\u884c\u548cSpring\u96c6\u6210\u7684\u3002<\/span><\/span><\/span><\/p>\n


<\/p>\n

2.1 \u521b\u5efa\u9879\u76ee<\/span><\/span><\/span><\/p>\n

\u4f7f\u7528idea\u521b\u5efa\u4e00\u4e2aSpring Boot\u9879\u76ee\uff0c\u53d6\u540d\u4e3a
spring-boot-myfeign-example\uff0c\u5f15\u5165\u4f9d\u8d56starter-web\u3002<\/span><\/span><\/span><\/p>\n

2.2 @EnableFeignClients<\/span><\/span><\/span><\/p>\n

\u4f7f\u7528\u6ce8\u89e3@EnableFeignClients\u8fdb\u884c\u542f\u7528\uff0c\u5177\u4f53\u7684\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/span><\/span><\/span><\/p>\n

import<\/span> org.springframework.context.annotation<\/span>.Import;
import<\/span> java.lang.annotation<\/span>.ElementType;
import<\/span> java.lang.annotation<\/span>.Retention;
import<\/span> java.lang.annotation<\/span>.RetentionPolicy;
import<\/span> java.lang.annotation<\/span>.Target;

\/**
 * \u901a\u8fc7 @EnableFeignClients<\/span> \u5f15\u5165\u4e86FeignClientsRegistrar\u5ba2\u6237\u7aef\u6ce8\u518c\u7c7b
 *\/<\/span>
@Target(ElementType.TYPE)<\/span>
@Retention(RetentionPolicy.RUNTIME)<\/span>
@Import(FeignClientsRegistrar.class)<\/span> \/\/FeignClientsRegistrar<\/span>
public<\/span> @interface<\/span> EnableFeignClients {
    String basePackages();
}

<\/code><\/pre>\n
\u8bf4\u660e\uff1a<\/span><\/span><\/span><\/p>\n
\uff081\uff09\u6ce8\u89e3@EnableFeignClients\u5c31\u662f\u542f\u7528FeignClient\u7684\u4e00\u4e2a\u6ce8\u89e3\uff0c\u4e3b\u8981\u7528\u4e8e\u6307\u5b9a\u8981\u626b\u63cf\u7684\u5305\u8def\u5f84\u4ee5\u53ca\u5f15\u5165\u4e00\u4e2abean\u5b9a\u4e49\u7684\u6ce8\u518c\u7c7b\u3002<\/span><\/span><\/span><\/p>\n
\uff082\uff09@Import\uff1a\u5f15\u5165Bean\u5b9a\u4e49\u7684\u6ce8\u518c\u7c7bFeignClientsRegistrar\uff0c\u8fd9\u4e2a\u7c7b\u7684\u5177\u4f53\u5b9e\u73b0\u770b\u540e\u9762\u3002<\/span><\/span><\/span><\/p>\n
\uff083\uff09\u5176\u5b83\u6ce8\u89e3\uff0c\u6bd4\u5982@Target\u3001@Retention\u662f\u5143\u6ce8\u89e3\uff08\u6ce8\u89e3\u7684\u6ce8\u89e3\u79f0\u4e3a\u5143\u6ce8\u89e3\uff09\u3002<\/span><\/span><\/span><\/p>\n
2.3 @FeignClient<\/span><\/span><\/span><\/p>\n
\u6ce8\u89e3FeiClient\u4e3b\u8981\u662f\u7528\u4e8e\u63a5\u53e3\uff0c\u7528\u4e8e\u626b\u63cf\u8fc7\u6ee4\u4f7f\u7528\u7684\uff1a<\/span><\/span><\/span><\/p>\n
import<\/span> java.lang.annotation<\/span>.ElementType;
import<\/span> java.lang.annotation<\/span>.Retention;
import<\/span> java.lang.annotation<\/span>.RetentionPolicy;
import<\/span> java.lang.annotation<\/span>.Target;

\/**
 * \u7c7b\u6ce8\u89e3,\u7528\u4e8e\u626b\u63cf\u8fc7\u6ee4
 *\/<\/span>
@Target(ElementType.TYPE)<\/span>
@Retention(RetentionPolicy.RUNTIME)<\/span>
public<\/span> @interface<\/span> FeiClient {
    String name();
}
<\/code><\/pre>\n

<\/p>\n
2.4 @FeignMethod<\/span><\/span><\/span><\/p>\n
\u6ce8\u89e3@FeignMethod\u662f\u6307\u5b9a\u8bf7\u6c42\u7684\u63a5\u53e3\u4ee5\u53ca\u65b9\u6cd5\uff1a<\/span><\/span><\/span><\/p>\n
import<\/span> org<\/span>.springframework<\/span>.http<\/span>.HttpMethod<\/span>;
import<\/span> java<\/span>.lang<\/span>.annotation<\/span>.ElementType<\/span>;
import<\/span> java<\/span>.lang<\/span>.annotation<\/span>.Retention<\/span>;
import<\/span> java<\/span>.lang<\/span>.annotation<\/span>.RetentionPolicy<\/span>;
import<\/span> java<\/span>.lang<\/span>.annotation<\/span>.Target<\/span>;


\/**
 * \u65b9\u6cd5\u6ce8\u89e3
 *\/<\/span>
@Target<\/span>(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface FeignMethod {
    String<\/span> path<\/span>();
    HttpMethod<\/span> method<\/span>() default<\/span> HttpMethod<\/span>.POST<\/span>;
}
<\/code><\/pre>\n

<\/p>\n
2.5 FeignClientsRegistrar<\/span><\/span><\/span><\/p>\n
FeignClientsRegistrar\u5b9e\u73b0\u4e86\u63a5\u53e3
ImportBeanDefinitionRegistrar\uff0c\u5b9e\u73b0\u6709\u70b9\u590d\u6742\uff0c\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\u793a\u4f8b\uff1a<\/span><\/span><\/span><\/p>\n
import<\/span> org.springframework.beans.factory.annotation<\/span>.AnnotatedBeanDefinition;
import<\/span> org.springframework.beans.factory.config.BeanDefinition;
import<\/span> org.springframework.beans.factory.support.BeanDefinitionRegistry;
import<\/span> org.springframework.context.annotation<\/span>.ClassPathScanningCandidateComponentProvider;
import<\/span> org.springframework.context.annotation<\/span>.ImportBeanDefinitionRegistrar;
import<\/span> org.springframework.core.type.AnnotationMetadata;
import<\/span> org.springframework.core.type.filter.AnnotationTypeFilter;
import<\/span> java.io.IOException;
import<\/span> java.util.Map;
import<\/span> java.util.Set;

\/**
 * \u501f\u52a9Spring\u7684ImportBeanDefinitionRegistrar\u5229\u5668\uff0c\u5728Spring\u521d\u59cb\u5316\u65f6\u6ce8\u5165\u76f8\u5173BeanDefinition\uff0c
 * \u5fc5\u987b\u4e3aFactoryBean\uff0c\u4ee5\u4fbf\u4e8e\u751f\u6210\u52a8\u6001\u4ee3\u7406\u5b8c\u6210\u8fdc\u7a0b\u8c03\u7528\u3002
 *\/<\/span>
public<\/span> class<\/span> FeignClientsRegistrar<\/span> implements<\/span> ImportBeanDefinitionRegistrar<\/span> <\/span>{

    @Override<\/span>
    public<\/span> void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        \/\/\u83b7\u53d6\u5230\u6ce8\u89e3\u4e0a\u7684\u5c5e\u6027 : {basePackages=com.kfit.demo.feign}<\/span>
        Map<String, Object>  attrs = importingClassMetadata.getAnnotationAttributes(EnableFeignClients.class<\/span>.getName<\/span><\/span>());
        if<\/span>(attrs == null<\/span> && attrs.size() == 0<\/span>){
            return<\/span>;
        }
        \/\/\u83b7\u53d6\u914d\u7f6e\u8981\u626b\u63cf\u7684\u5305\u8def\u5f84\uff1acom.kfit.demo.feign<\/span>
        String basePackages = String.valueOf(attrs.get<\/span>(\"basePackages\"<\/span>));
        System.out<\/span>.println(\"basePackages:\"<\/span>+basePackages);
        \/\/\u626b\u63cf\u5305\u8def\u5f84\u4e0b\u7684\u7c7b.<\/span>
        ClassPathScanningCandidateComponentProvider scanner = new ClassPathScanningCandidateComponentProvider(false<\/span>){
            \/**
             * \u5224\u65ad\u8d44\u6e90\u662f\u5426\u4e3a\u5019\u9009\u7684\u7ec4\u4ef6,\u8fd9\u91cc\u76f4\u63a5\u8fd4\u56detrue\u3002
             *
             * \u5982\u679c\u662f\u5e95\u5c42\u7684\u5b9e\u73b0\u7684\u8bdd\uff0c\u4f1a\u901a\u8fc7excludeFilters\u548cincludeFilters\u8fdb\u884c\u5224\u65ad\u3002
             * @return<\/span>
             *\/<\/span>
            @Override<\/span>
            protected<\/span> boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
                return<\/span> true<\/span>;
            }
        };
        \/\/\u626b\u63cf\u7684\u7c7b\u4e0a\u7684\u6ce8\u89e3\u4e3a\uff1a@RMIClient<\/span>
        scanner.addIncludeFilter(new AnnotationTypeFilter(FeiClient.class<\/span>));<\/span>
        \/\/\u67e5\u627e\u83b7\u9009\u7684\u7ec4\u4ef6.<\/span>
        Set<BeanDefinition> beanDefinitionSet =  scanner.findCandidateComponents(basePackages);
        System.out<\/span>.println(\"BeanDefinition\uff1a\"<\/span>+beanDefinitionSet.size());
        for<\/span>(BeanDefinition beanDefinition:beanDefinitionSet){
            System.out<\/span>.println(beanDefinition);
            \/\/ \u5411\u6784\u9020\u65b9\u6cd5\u4e2d\u6dfb\u52a0\u53c2\u6570\uff0c\u503c\u4e3a\u76ee\u6807bean\u7684\u5168\u8def\u5f84\u540d\uff0cSpring\u4f1a\u81ea\u52a8\u8f6c\u6362\u6210Class\u5bf9\u8c61<\/span>
            beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(beanDefinition.getBeanClassName());
            beanDefinition.setBeanClassName(FeignFactoryBean.class<\/span>.getName<\/span><\/span>());
            registry.registerBeanDefinition(beanDefinition.getBeanClassName(),beanDefinition);
        }
    }
}
<\/code><\/pre>\n

<\/p>\n
\u8bf4\u660e\uff1a\u8fd9\u4e2a\u7c7b\u5bf9\u4e8e\u6ca1\u6709\u4f7f\u7528Spring\u63d0\u4f9b\u7684\u65b9\u6cd5\u8fdb\u884c\u7f16\u7801\u7684\uff0c\u4f1a\u6709\u70b9\u590d\u6742\uff0c\u4e3a\u4e86\u5927\u5bb6\u80fd\u591f\u770b\u61c2\uff0c\u6211\u5df2\u7ecf\u5728\u6bcf\u884c\u6838\u5fc3\u4ee3\u7801\u90fd\u6dfb\u52a0\u4e86\u6ce8\u91ca\u3002<\/span><\/span><\/span><\/p>\n
\uff081\uff09\u9996\u5148\u9700\u8981\u83b7\u53d6\u5230@EnableFeignClients\u7684\u6ce8\u89e3\u5c5e\u6027\u4fe1\u606f\uff0c\u83b7\u53d6\u5230\u8bbe\u7f6e\u7684\u5305\u8def\u5f84\uff0c\u6bd4\u5982\uff1acom.kfit.*.feign\u3002<\/span><\/span><\/span><\/p>\n
\uff082\uff09\u4f7f\u7528Spring\u63d0\u4f9b\u7684ClassPathScanning\u2026\u8fdb\u884c\u626b\u63cf\u5230BeanDefinition\uff0c\u4e3b\u8981\u662f\u901a\u8fc7\u8bbe\u7f6e\u7684\u5305\u8def\u5f84\u548c\u6ce8\u89e3@FeiClient\u8fdb\u884c\u8fc7\u6ee4\u3002<\/span><\/span><\/span><\/p>\n
\uff083\uff09\u5bf9\u83b7\u53d6\u5230\u7684BeanDefinition\u4fe1\u606f\uff0c\u8fdb\u884c\u5c5e\u6027\u8d4b\u503c\uff0c\u6700\u6838\u5fc3\u7684\u4e00\u53e5\u4ee3\u7801\u5c31\u662f\u6307\u5b9abean class\u4e3aFeignFactoryBean\u3002\u5bf9\u4e8eFeignFactoryBean\u7684\u5b9e\u73b0\u770b\u4e0b\u9762\u4ee3\u7801\u3002<\/span><\/span><\/span><\/p>\n
2.6 FeignFactoryBean<\/span><\/span><\/span><\/p>\n
\u6700\u540e\u770b\u4e0bbean\u5b9a\u4e49\u7684\u5177\u4f53\u5b9e\u73b0\u7c7b\uff0c\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/span><\/span><\/span><\/p>\n
import<\/span> org.springframework.beans.factory.FactoryBean;
import<\/span> org.springframework.http.HttpMethod;
import<\/span> java.io.BufferedReader;
import<\/span> java.io.IOException;
import<\/span> java.io.InputStreamReader;
import<\/span> java.lang.reflect.InvocationHandler;
import<\/span> java.lang.reflect.Method;
import<\/span> java.lang.reflect.Proxy;
import<\/span> java.net.HttpURLConnection;
import<\/span> java.net.URL;
import<\/span> java.util.HashMap;
import<\/span> java.util.Map;

public<\/span> class<\/span> FeignFactoryBean<\/span><T<\/span>> implements<\/span> FactoryBean<\/span><T<\/span>>, InvocationHandler<\/span> <\/span>{
    Map<String,String> hosts = new<\/span> HashMap<>();


    \/\/ \u5bf9\u8c61\u5b58\u50a8\u76ee\u6807\u7c7b\u578b<\/span>
    private<\/span> Class<T> targetClass;


    \/\/ \u6784\u9020\u65b9\u6cd5\u4f20\u5165\u76ee\u6807\u7c7b\u578b<\/span>
    public<\/span> FeignFactoryBean<\/span>(Class<T> targetClass)<\/span> <\/span>{
        hosts.put(\"user-service\"<\/span>,\"http:\/\/127.0.0.1:8080\"<\/span>);
        this<\/span>.targetClass = targetClass;
    }


    @Override<\/span>
    public<\/span> T getObject<\/span>()<\/span> throws<\/span> Exception <\/span>{
        return<\/span> (T) Proxy.newProxyInstance(targetClass.getClassLoader(), new<\/span> Class[]{targetClass}, this<\/span>);
    }


    @Override<\/span>
    public<\/span> Class<?> getObjectType() {
        return<\/span> targetClass;
    }


    @Override<\/span>
    public<\/span> Object invoke<\/span>(Object proxy, Method method, Object[] args)<\/span> throws<\/span> Throwable <\/span>{
        String result = null<\/span>;
        \/\/\u83b7\u53d6\u65b9\u6cd5\u4e0a\u7684\u6ce8\u89e3\u4fe1\u606f.<\/span>
        FeiClient rmiClient = targetClass.getAnnotation(FeiClient.class<\/span>)<\/span>;
        FeignMethod rmiMethod = method.getAnnotation(FeignMethod.class<\/span>)<\/span>;
        if<\/span>(rmiMethod != null<\/span> && rmiClient != null<\/span>){
            String path = rmiMethod.path();
            HttpMethod httpMethod = rmiMethod.method();
            System.out.println(\"\u83b7\u53d6\u5230\u7684\u6ce8\u89e3\u4e0a\u7684\u4fe1\u606f\uff1a\"<\/span> + rmiClient.name() + \" -- \"<\/span> + rmiMethod.path());
            String urlPath = hosts.get(rmiClient.name()) + path;

            System.out.println(\"\u8f6c\u6362\u4e4b\u540e\u7684\u8bf7\u6c42\u8def\u5f84\uff1a\"<\/span> +urlPath);

            \/\/\u6709\u4e86\u5730\u5740\u5c31\u53ef\u4ee5\u4f7f\u7528HttpURLConnection\u3001okHttp\u7b49\u53d1\u8d77\u7f51\u7edc\u8bf7\u6c42.<\/span>
            \/\/ \u8fd9\u91cc\u4f7f\u7528HttpURLConnection\u6a21\u62df\u4e00\u4e0b.<\/span>
            result = post(urlPath);
            System.out.println(\"\u7f51\u7edc\u8bf7\u6c42\u6267\u884c\u7684\u7ed3\u679c\uff1a\"<\/span> + result);
        }
        return<\/span> result;
    }

    private<\/span> String post<\/span>(String urlPath)<\/span><\/span>{
        String result = \"\"<\/span>;
        try<\/span> {
            URL url = new<\/span> URL(urlPath);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            \/\/ \u8bbe\u7f6e\u8bf7\u6c42\u65b9\u5f0f<\/span>
            connection.setRequestMethod(\"POST\"<\/span>);
            \/\/ \u8bbe\u7f6e\u662f\u5426\u5411HttpURLConnection\u8f93\u51fa<\/span>
            connection.setDoOutput(true<\/span>);
            \/\/ \u8bbe\u7f6e\u662f\u5426\u4ecehttpUrlConnection\u8bfb\u5165<\/span>
            connection.setDoInput(true<\/span>);
            \/\/ \u8bbe\u7f6e\u662f\u5426\u4f7f\u7528\u7f13\u5b58<\/span>
            connection.setUseCaches(false<\/span>);
            \/\/\u8bbe\u7f6e\u53c2\u6570\u7c7b\u578b\u662fjson\u683c\u5f0f<\/span>
            connection.setRequestProperty(\"Content-Type\"<\/span>, \"application\/json;charset=utf-8\"<\/span>);
            connection.connect();
            int<\/span> responseCode = connection.getResponseCode();
            if<\/span>(responseCode == HttpURLConnection.HTTP_OK) {
                \/\/\u5b9a\u4e49 BufferedReader \u8f93\u5165\u6d41\u6765\u8bfb\u53d6URL\u7684\u54cd\u5e94<\/span>
                BufferedReader in = new<\/span> BufferedReader(new<\/span> InputStreamReader(connection.getInputStream()));
                String line;
                while<\/span> ((line = in.readLine()) != null<\/span>) {
                    result += line;
                }
            }
        } catch<\/span> (IOException e) {
            e.printStackTrace();
        }
        return<\/span> result;
    }
}
<\/code><\/pre>\n
\u8bf4\u660e\uff1a<\/span><\/span><\/span><\/p>\n
\uff081\uff09FeignFactoryBean\u5b9e\u73b0\u4e86\u4e24\u4e2a\u63a5\u53e3FactoryBean\u4ee5\u53caInvocationHandler\u3002<\/span><\/span><\/span><\/p>\n
\uff082\uff09\u5b9e\u73b0FactoryBean\u4e3b\u8981\u662f\u4e3a\u4e86\u80fd\u591f\u8fd4\u56de\u4e00\u4e2a\u901a\u8fc7\u52a8\u6001\u4ee3\u7406\u5b9e\u73b0\u7684\u5bf9\u8c61\u3002<\/span><\/span><\/span><\/p>\n
\uff083\uff09\u5b9e\u73b0\u63a5\u53e3InvocationHandler\u8fd9\u4e2a\u5c31\u662fJDK\u7684\u52a8\u6001\u4ee3\u7406\u4e86\u3002<\/span><\/span><\/span><\/p>\n
\uff084\uff09getObject()\uff1a\u4f7f\u7528jdk\u7684Proxy\u6784\u9020\u4e86\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\u3002\u6ce8\u610f\u8fd9\u4e2a\u65b9\u6cd5\u5728Spring\u542f\u52a8\u7684\u8fc7\u7a0b\u4e2d\u5c31\u6267\u884c\u4e86\uff0c\u5e76\u4e0d\u662f\u6bcf\u6b21\u8bbf\u95ee\u7684\u65f6\u5019\u624d\u6267\u884c\uff0c\u6240\u4ee5\u53ea\u6267\u884c\u4e00\u6b21\u3002<\/span><\/span><\/span><\/p>\n
\uff085\uff09invoke()\uff1aInvocationHandler\u7684\u56de\u8c03\u65b9\u6cd5\uff0c\u6b64\u65b9\u6cd5\u6838\u5fc3\u5c31\u662f\u83b7\u53d6\u6ce8\u89e3\u4e0a\u7684\u4fe1\u606f\uff0c\u6784\u9020url\uff0c\u7136\u540e\u4f7f\u7528\u76f8\u5e94\u7684\u7f51\u7edc\u8bf7\u6c42\u5de5\u5177\u53d1\u8d77\u8bf7\u6c42\u3002<\/span><\/span><\/span><\/p>\n
\uff086\uff09\u7f51\u7edc\u8bf7\u6c42\u65b9\u5f0f\u53ef\u4ee5\u662f\uff1aHttpURLConnection\uff08java\u539f\u751f\uff09\u3001OkHttp\u3001Apache HttpClient\u3001RestTemplate\u3001Ribbon\u7b49\u53d1\u8d77\u7f51\u7edc\u8bf7\u6c42\u3002<\/span><\/span><\/span><\/p>\n
\uff087\uff09\u8fd9\u91cc\u5bf9\u4e8e\u670d\u52a1\u540d\u79f0\u7684\u89e3\u6790\uff0c\u4f7f\u7528\u4e86\u6700\u7b80\u5355\u7684Map\u5b58\u50a8\u65b9\u5f0f\uff0c\u5b9e\u9645\u6846\u67b6\u4e2d\u4f1a\u6bd4\u590d\u6742\u5f88\u591a\u3002<\/span><\/span><\/span><\/p>\n
\u5728\u524d\u9762\u6211\u4eec\u5bf9\u4e8eRestTemplate\u548cRibbon\u6709\u4e86\u4e00\u4e2a\u57fa\u672c\u7684\u8ba4\u77e5\uff0c\u90a3\u4e48\u8fd9\u91cc\u6709\u4e00\u4e2a\u7591\u95ee\uff1f\u5c31\u662fRibbon\u53ef\u4ee5\u4e0d\u4f9d\u8d56RestTemplate\u5355\u72ec\u4f7f\u7528\u5417\uff1f\u5927\u5bb6\u81ea\u884c\u5728\u8bc4\u8bba\u533a\u8fdb\u884c\u8ba8\u8bba\u3002<\/span><\/span><\/span><\/p>\n

<\/p>\n
\u4e09\u3001\u6a21\u62dfFeignClient\u7684\u4f7f\u7528<\/span><\/span><\/span><\/p>\n
\u6211\u4eec\u5df2\u7ecf\u901a\u8fc7Spring\u7684\u6269\u5c55\u70b9FactoryBean\u548c
ImportBeanDefinitionRegistrar\u6a21\u62df\u4e86FeignClient\u7684\u7b80\u5355\u5b9e\u73b0\uff0c\u90a3\u4e48\u662f\u5426\u53ef\u7528\u5462\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u5199\u4e2a\u4f8b\u5b50\u6765\u9a8c\u8bc1\u4e0b\u3002<\/span><\/span><\/span><\/p>\n
3.1\u6dfb\u52a0\u6ce8\u89e3@EnableFeignClients<\/span><\/span><\/span><\/p>\n
\u5728\u542f\u52a8\u7c7b\u4e0a\u6dfb\u52a0\u6ce8\u89e3@EnableFeignClients\uff1a<\/span><\/span><\/span><\/p>\n
@SpringBootApplication<\/span>
@EnableFeignClients<\/span>(basePackages = \"com.kfit.*.feign\"<\/span>)<\/code><\/pre>\n

<\/p>\n
\u8bf4\u660e\uff1a\u6307\u5b9a\u62a5\u540d\u4e3acom.kfit.*.feign\u3002<\/span><\/span><\/span><\/p>\n
3.2\u6dfb\u52a0\u63a5\u53e3<\/span><\/span><\/span><\/p>\n
\u4f7f\u7528@FeignClient\u6dfb\u52a0\u63a5\u53e3\uff1a<\/span><\/span><\/span><\/p>\n
import<\/span> com<\/span>.kfit<\/span>.config<\/span>.FeiClient<\/span>;
import<\/span> com<\/span>.kfit<\/span>.config<\/span>.FeignMethod<\/span>;

\/**
 * \u8bf7\u6c42\u5b9e\u4f8b.
 *\/<\/span>
@FeiClient<\/span>(name = \"user-service\"<\/span>)
public interface DemoFeignClient {
    @FeignMethod<\/span>(path= \"\/api\"<\/span>)
    Object test();
}<\/code><\/pre>\n

<\/p>\n
3.3\u4f7f\u7528DemoFeignClient<\/span><\/span><\/span><\/p>\n
\u7531\u4e8eDemoFeignClient\u4e0a\u6dfb\u52a0\u4e86\u6ce8\u89e3@FeiClient\uff0c\u6240\u4ee5\u5c31\u88ab\u6ce8\u5165\u4f7f\u7528\u52a8\u6001\u4ee3\u7406\u7684\u65b9\u5f0f\u8fdb\u884c\u5b9e\u73b0\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u8fd9\u4e2a\u63a5\u53e3\u4e86\uff08\u5b9e\u9645\u4e0a\u4e5f\u662f\u7c7b\uff09\uff1a<\/span><\/span><\/span><\/p>\n
import<\/span> com<\/span>.kfit<\/span>.demo<\/span>.feign<\/span>.DemoFeignClient<\/span>;
import<\/span> org<\/span>.springframework<\/span>.beans<\/span>.factory<\/span>.annotation<\/span>.Autowired<\/span>;
import<\/span> org<\/span>.springframework<\/span>.web<\/span>.bind<\/span>.annotation<\/span>.RequestMapping<\/span>;
import<\/span> org<\/span>.springframework<\/span>.web<\/span>.bind<\/span>.annotation<\/span>.RestController<\/span>;


@RestController<\/span>
public class DemoController {


    @Autowired<\/span>
    private DemoFeignClient demoFeignClient;


    @RequestMapping<\/span>(\"\/api\")
    public Object api(){
        return<\/span> \"I<\/span> love<\/span> Angelababy<\/span>!\";
    }


    @RequestMapping<\/span>(\"\/test\")
    public Object test(){
        return<\/span> demoFeignClient<\/span>.test<\/span>();
    }
}

<\/code><\/pre>\n

<\/p>\n
\u8bf4\u660e\uff1a<\/span><\/span><\/span><\/p>\n
\uff081\uff09\/api\uff1a\u7528\u4e8eFeignClent\u8fdb\u884c\u8c03\u7528\u3002<\/span><\/span><\/span><\/p>\n
\uff082\uff09\/test\uff1a\u7528\u4e8e\u9879\u76ee\u4f7f\u7528demoFeignClient\u8c03\u7528\u8bbf\u95ee\u3002<\/span><\/span><\/span><\/p>\n
\uff083\uff09\u8bf7\u6c42\u8bf4\u660e\uff1a\u901a\u8fc7\u6d4f\u89c8\u5668\u8bbf\u95ee\/test\uff0c\u7136\u540e\u8c03\u7528demoFeignClient\u7684test()\u65b9\u6cd5\uff1b\u7136\u540e\u8c03\u7528\u4ee3\u7406\u7c7bFeignClientsRegistrar\u7684invoke()\u65b9\u6cd5\uff0c\u5728invoke\u65b9\u6cd5\u4e2d\u4f1a\u83b7\u53d6\u5230\u63a5\u53e3DemoFeignClient\u4e0a\u7684\u6ce8\u89e3\u4fe1\u606f\uff0c\u6784\u5efa\u51fa\u8bf7\u6c42\u5730\u5740\uff0c\u8bbf\u95ee\/api\uff1b\u6700\u540e\u5c31\u662f\u76f8\u5e94\u7684\u7f51\u7edc\u8bf7\u6c42\u53d1\u8d77\u7f51\u7edc\u8bf7\u6c42\uff0c\u8fd4\u56de\u63a5\u53e3\u3002<\/span><\/span><\/span><\/p>\n
3.4\u6d4b\u8bd5<\/span><\/span><\/span><\/p>\n
\u542f\u52a8Spring Boot\u5e94\u7528\uff0c\u8bbf\u95ee\u5982\u4e0b\u5730\u5740\u8fdb\u884c\u6d4b\u8bd5\uff1a<\/span><\/span><\/span><\/p>\n
http:\/\/127.0.0.1:8080\/test<\/span><\/span><\/span><\/p>\n
\u770b\u4e0b\u63a7\u5236\u53f0\u7684\u4e00\u4e9b\u4fe1\u606f\u6253\u5370\uff1a<\/span><\/span><\/span><\/p>\n
\u8fd4\u56de\u4fe1\u606f\uff1aI love Angelababy\uff0c\u4f60\u4e5f\u559c\u6b22\u5417\uff1f<\/span><\/span><\/span><\/p>\n
\u603b\u7ed3<\/span><\/span><\/span><\/p>\n
\u8fd9\u4e00\u5c0f\u7ed3\u7528\u5230\u7684\u77e5\u8bc6\u70b9\u7279\u522b\u591a\uff0c\u5927\u5bb6\u53ef\u4ee5\u5148\u6536\u85cf\u8d77\u6765\uff0c\u7136\u540e\u591a\u770b\u51e0\u904d\u3002\u5229\u7528\u8fd9\u5957\u601d\u8def\uff0c\u53ef\u4ee5\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u73a9\u51fa\u5f88\u591a\u82b1\u6837\u3002\u4e3a\u4e86\u5927\u5bb6\u66f4\u597d\u7684\u7406\u89e3\uff0c\u6700\u540e\u5728\u5bf9\u4e00\u4e9b\u8981\u70b9\u603b\u7ed3\u4e00\u4e0b\uff1a<\/span><\/span><\/span><\/p>\n
\uff081\uff09\u6574\u4e2a\u7a0b\u5e8f\u7684\u5165\u53e3\u662f@EnableFeignClients\uff0cSpring Boot\u5728\u542f\u52a8\u7684\u65f6\u5019\u4f1a\u6267\u884c\u8fd9\u4e2a\u6ce8\u89e3\u3002<\/span><\/span><\/span><\/p>\n
\uff082\uff09\u5bf9\u4e8e@EnableFeignClients\u6700\u91cd\u8981\u7684\u4e00\u4e2a\u70b9\u5c31\u662f\u901a\u8fc7@Import\u5bfc\u5165\u4e86\u53e6\u5916\u4e00\u4e2a\u7c7bFeignClientsRegistrar\u3002\u5bf9\u4e8epackage\u7684\u6307\u5b9a\u5230\u4e0d\u662f\u6700\u91cd\u8981\u7684\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u53ef\u4ee5\u4f7f\u7528Spring Boot\u9ed8\u8ba4\u626b\u63cf\u7684\u5305\u8def\u5f84\uff0c\u8fd9\u4e2a\u8981\u600e\u4e48\u83b7\u53d6\uff1f\u4f60\u77e5\u9053\u5417\uff1f<\/span><\/span><\/span><\/p>\n
\uff084\uff09\u5bf9\u4e8eFeignClientsRegistrar\u662f\u6574\u4e2a@FeignClient\u6ce8\u89e3\u7684\u63a5\u53e3\u53ef\u4ee5\u6267\u884c\u7684\u5173\u952e\u3002\u5728\u8be5\u7c7b\u4e2d\u4e3b\u8981\u662f\u626b\u63cf\u6307\u5b9a\u5305\u4e0b\u5e76\u4e14\u6ce8\u89e3\u4e86@FeignClient\u7684BeanDefinition\uff0c\u8bf4\u660e\u63a5\u53e3\u4fe1\u606f\u662f\u53ef\u4ee5\u88abSpring\u626b\u63cf\u6210\u4e3abean\u5b9a\u4e49\u7684\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0bSpring\u4e0d\u626b\u63cf\u7684\uff0c\u56e0\u4e3a\u626b\u63cf\u8fdb\u6765\u4e86\u4e4b\u540eSpring\u4e0d\u77e5\u9053\u63a5\u53e3\u5177\u4f53\u8981\u5982\u4f55\u5b9e\u73b0\u3002\u5728FeignClientsRegistrar\u4e2d\u6dfb\u52a0\u4e86BeanDefinition\uff0c\u5176\u4e2d\u6700\u91cd\u8981\u7684\u5c31\u662f\u8981\u8bbe\u7f6e\u5177\u4f53\u7684\u5b9e\u73b0\u7c7bBean Class\uff0c\u8fd9\u8fd9\u91cc\u6307\u5b9a\u4e3aFeignFactoryBean\u3002<\/span><\/span><\/span><\/p>\n
\uff085\uff09\u5bf9\u4e8eFeignFactoryBean\u5b9e\u73b0\u4e86\u63a5\u53e3FactoryBean\u3001InvocationHandler\u3002\u5bf9\u4e8e\u63a5\u53e3FactoryBean\u4e3b\u8981\u662f\u5b9e\u73b0\u65b9\u6cd5getObject\uff0c\u901a\u8fc7JDK\u7684\u4ee3\u7406\u7c7bProxy\u8fd4\u56de\u4ee3\u7406\u5bf9\u8c61\uff1b\u5bf9\u4e8eInvocationHandler\u5c31\u662f\u52a8\u6001\u4ee3\u7406\u5177\u4f53\u7684\u5904\u7406\u65b9\u6cd5\u4e86\uff0c\u5728\u8fd9\u91cc\u4f1a\u83b7\u53d6\u5230\u6ce8\u89e3\u4e86@FeignClient\u63a5\u53e3\u4e0a\u7684\u6ce8\u89e3\u4fe1\u606f\u548c\u65b9\u6cd5\u4fe1\u606f\uff0c\u6784\u9020\u51fa\u8bf7\u6c42\u7684URL\u5730\u5740\uff0c\u4ece\u800c\u53d1\u8d77\u7f51\u7edc\u8bf7\u6c42\u3002<\/span><\/span><\/span><\/p>\n

<\/p>\n
\u6700\u540e\u7684\u6700\u540e\uff0c\u770b\u6ca1\u770b\u61c2\u4e0d\u91cd\u8981\uff0c\u5148\u6536\u85cf\u8d77\u6765\uff0c\u5728\u6162\u6162\u54c1\u5c1d\uff0c\u8fd9\u4e00\u7bc7\u503c\u5f97\u4f60\u597d\u597d\u5b66\u4e60\u4e00\u4e0b\uff0c\u4f60\u9762\u8bd5\u7684\u8bdd\uff0c\u5c31\u53ef\u4ee5\u88c5\u903c\u4e86~<\/span><\/span><\/span><\/p>\n
<\/mp-common-profile><\/section>\n
\u5982\u559c\u6b22\u672c\u6587\uff0c\u8bf7\u70b9\u51fb\u53f3\u4e0a\u89d2\uff0c\u628a\u6587\u7ae0\u5206\u4eab\u5230\u670b\u53cb\u5708<\/span>
<\/span><\/p>
\u56e0\u516c\u4f17\u53f7\u66f4\u6539\u63a8\u9001\u89c4\u5219\uff0c\u8bf7\u70b9\u201c\u5728\u770b\u201d\u5e76\u52a0\u201c\u661f\u6807\u201d\u7b2c\u4e00\u65f6\u95f4\u83b7\u53d6\u7cbe\u5f69\u6280\u672f\u5206\u4eab<\/span><\/span><\/strong><\/p>
\u00b7END\u00b7<\/strong><\/p><\/pre>\n
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