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Micro Front

paulwong — Thu, 14 Dec 2023 01:58:00 GMT

微服務很夯，那你有聽過微前端嗎？初探 Micro Frontends �E�式架構
https://medium.com/starbugs/%E5%BE%AE%E6%9C%8D%E5%8B%99%E5%BE%88%E5%A4%AF-%E9%82%A3%E4%BD%A0%E6%9C%89%E8%81%BD%E9%81%8E%E5%BE%AE%E5%89%8D%E7%AB%AF%E5%97%8E-%E5%88%9D%E6%8E%A2-micro-frontends-%E6%9E%B6%E6%A7%8B-e0a8469be601

一��h��a?Micro Frontends 的世�?br />https://blog.techbridge.cc/2019/01/12/micro-frontends-concept/

Micro Frontends
extending the microservice idea to frontend development
https://micro-frontends.org/

paulwong 2023-12-14 09:58 发表评论

SPRING CLOUD CONFIG有界面的配置��理中心

paulwong — Thu, 07 Oct 2021 08:55:00 GMT

https://dyc87112.github.io/spring-cloud-config-admin/

paulwong 2021-10-07 16:55 发表评论

paulwong — Wed, 06 Jan 2021 06:44:00 GMT

微服务架构及设计模式
http://dockone.io/article/9680

微服务架�?0个最重要的设计模�?br />https://developer.51cto.com/art/202012/635852.htm

GitHub标星127K�Q�字节内部必�?#8220;微服务架构设计模�?#8221;
https://blog.csdn.net/a159357445566/article/details/110006542

微服务架构及其最重要�?0个设计模�?br />https://www.infoq.cn/article/Kdw69bdimlX6FSGz1bg3

Effective Microservices: 10 Best Practices
https://towardsdatascience.com/effective-microservices-10-best-practices-c6e4ba0c6ee2

Microservice Architecture and its 10 Most Important Design Patterns
https://towardsdatascience.com/microservice-architecture-and-its-10-most-important-design-patterns-824952d7fa41

paulwong 2021-01-06 14:44 发表评论

��Z��Spring Cloud的快速开发脚手架&最佛_��跉|�ȝ��

paulwong — Fri, 09 Oct 2020 02:48:00 GMT

Spring Cloud	你懂�?/td>
Keycloak	微服务认证授�?/td>
Jenkins	持箋集成
SonarQube	代码质量控制

https://gitee.com/itmuch/spring-cloud-yes

paulwong 2020-10-09 10:48 发表评论

Spring Cloud异步场景分布式事务怎样做？试试RocketMQ

paulwong — Wed, 15 Jul 2020 02:33:00 GMT

例如有如下场景，新增一订单�Q�同时�ؓ此订单的用户增加�U�分。场景对应场景表�Q�积分对应积分表�Q�如果要防止订单增加成功而积分增加不成功�Q�则要将此两�U�操作放在一个事务下�?br />
分布式的场景下，订单服务在一个JVM下，�U�分服务在另一个JVM下，两者要如何才能辑ֈ�数据一��_��原子�Q�性？

https://zlt2000.gitee.io/2019-09-23-rocketmq-transaction/

paulwong 2020-07-15 10:33 发表评论

!!zlt-microservices-platform

paulwong — Wed, 15 Jul 2020 02:15:00 GMT

1. ��M��架构�?/h2>

2. 功能介绍

https://github.com/zlt2000/microservices-platform

https://zlt2000.gitee.io/

产品文档�Q�付费，微信��d��Q�：
https://www.kancloud.cn/zlt2000/microservices-platform

paulwong 2020-07-15 10:15 发表评论

APM资源

paulwong — Mon, 30 Dec 2019 08:50:00 GMT

Spring Boot 2 实战�Q��?Spring Boot Admin 监控你的应用
https://my.oschina.net/10000000000/blog/3119697

监控��理之Spring Boot Admin使用
https://my.oschina.net/xiedeshou/blog/2051625

https://my.oschina.net/janlle/blog/3040749

paulwong 2019-12-30 16:50 发表评论

微服�?�|�关

paulwong — Mon, 30 Dec 2019 08:44:00 GMT

微服务开源最强网关Kong
https://felord.cn/kong-api-gateway.html

云原生网�?Kong 和Kong ��理UI Konga的完全安装攻�?br />https://felord.cn/kong-and-konga-install.html

paulwong 2019-12-30 16:44 发表评论

使用Spring Cloud Security OAuth2搭徏授权服务

paulwong — Fri, 16 Sep 2016 10:22:00 GMT

Spring Cloud Security OAuth2 �?Spring �?OAuth2 的开源实玎ͼ�优点是能与Spring Cloud技术线无缝集成�Q�如果全部��用默认配�|�，开发者只需要添加注解就能完�?OAuth2 授权服务的搭建�?/p>

1. ��d��依赖

授权服务是基于Spring Security的，因此需要在��目中引入两个依赖：

<dependency>
        <groupId>org.springframework.cloudgroupId>
        <artifactId>spring-cloud-starter-securityartifactId>
dependency>

<dependency>
         <groupId>org.springframework.cloudgroupId>
         <artifactId>spring-cloud-starter-oauth2artifactId>
dependency>

前者�ؓ Security�Q�后者�ؓSecurity的OAuth2扩展�?/p>

2. ��d��注解和配�|?/h1>
在启动类中添�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">@EnableAuthorizationServer注解�Q?br />
@SpringBootApplication
@EnableAuthorizationServer
public class AlanOAuthApplication {
    public static void main(String[] args) {
        SpringApplication.run(AlanOAuthApplication.class, args);
    }
}

完成�q�些我们的授权服务最基本的骨架就已经搭徏完成了。但是要惌��通整个流�E�，我们必须分配 `client_id`, `client_secret`才行。Spring Security OAuth2的配�|�方法是�~�写`@Configuration`�cȝ��?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">AuthorizationServerConfigurerAdapter�Q�然后重�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">void configure(ClientDetailsServiceConfigurer clients)�Ҏ��Q�如�Q?br />
@Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory() // 使用in-memory存储
                .withClient("client") // client_id
                .secret("secret") // client_secret
                .authorizedGrantTypes("authorization_code") // 该client允许的授权类�?/span>
                .scopes("app"); // 允许的授权范�?/span>
    }

3. 授权��程

讉K��授权��面�Q?br />

localhost:8080/oauth/authorize?client_id=client&response_type=code&redirect_uri=http://www.baidu.com

此时��览器会让你输入用户名密码，�q�是因�ؓ Spring Security 在默认情况下会对所有URL��d��Basic Auth认证。默认的用户名�ؓuser, 密码是随机生成的�Q�在控制台日志中可以看到�?/p>

画风虽然很简陋，但是基本功能都具备了。点�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">Authorize后，��览器就会重定向到百度，�q�带�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">code参数�Q?/p>

拿到code以后�Q�就可以调用

POST/GET http://client:secret@localhost:8080/oauth/token1

来换�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">access_token了：

curl -X POST -H "Cache-Control: no-cache" -H "Content-Type: application/x-www-form-urlencoded" -d 'grant_type=authorization_code&code=Li4NZo&redirect_uri=http://www.baidu.com' "http://client:secret@localhost:8080/oauth/token"

�q�回如下�Q?br />

{
  "access_token": "32a1ca28-bc7a-4147-88a1-c95abcc30556",
  "token_type": "bearer",
  "expires_in": 2591999,
  "scope": "app"
}

到此我们最最基本的授权服务就搭徏完成了。然而，�q�仅仅是个demo�Q�如果要在生产环境中使用�Q�还需要做更多的工作�?/p>

4. 使用MySQL存储access_token和client信息

把授权服务器中的数据存储到数据库中�ƈ不难�Q�因�?Spring Cloud Security OAuth 已经为我们设计好了一套Schema和对应的DAO对象。但在��用之前，我们需要先对相关的�c�L��一定的了解�?/p>

4.1 相关接口

Spring Cloud Security OAuth2通过DefaultTokenServices�c�L��完成token生成、过期等 OAuth2 标准规定的业务逻辑�Q��?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">DefaultTokenServices又是通过TokenStore接口完成对生成数据的持久化。在上面的demo中，TokenStore的默认实��CؓInMemoryTokenStore�Q�即内存存储�?对于Client信息�Q?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">ClientDetailsService接口负责从存储仓库中��d��数据�Q�在上面的demo中默认��用的也是InMemoryClientDetialsService实现�c�R��说到这里就能看出，要想使用数据库存储，只需要提供这些接口的实现�c�d��可。庆�q�的是，框架已经为我们写好JDBC实现了，�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">JdbcTokenStore�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">JdbcClientDetailsService�?/p>

4.2 ��

要想使用�q�些JDBC实现�Q�首先要��。框架�ؓ我们提前设计好了schema, 在github上：https://github.com/spring-projects/spring-security-oauth/blob/master/spring-security-oauth2/src/test/resources/schema.sql

在��用这套表�l�构之前要注意的是，对于MySQL来说�Q�默认徏表语句中主键是varchar(255)�c�d��Q�在mysql中执行会报错�Q�原因是mysql对varchar主键长度有限制。所以这里改�?28卛_��。其�ơ，语句中会有某些字�D��ؓLONGVARBINARY�c�d��Q�它对应mysql�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">blob�c�d��Q�也需要修改一下�?/p>

4.3 配置

数据库徏好后�Q�下一步就是配�|�框架��用JDBC实现。方法还是编�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">@Configuration�cȝ��?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">AuthorizationServerConfigurerAdapter�Q?br />

@Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private DataSource dataSource;
    @Bean // 声明TokenStore实现
    public TokenStore tokenStore() {
        return new JdbcTokenStore(dataSource);
    }
    @Bean // 声明 ClientDetails实现
    public ClientDetailsService clientDetails() {
        return new JdbcClientDetailsService(dataSource);
    }
    @Override // 配置框架应用上述实现
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.authenticationManager(authenticationManager);
        endpoints.tokenStore(tokenStore());

        // 配置TokenServices参数
        DefaultTokenServices tokenServices = new DefaultTokenServices();
        tokenServices.setTokenStore(endpoints.getTokenStore());
        tokenServices.setSupportRefreshToken(false);
        tokenServices.setClientDetailsService(endpoints.getClientDetailsService());
        tokenServices.setTokenEnhancer(endpoints.getTokenEnhancer());
        tokenServices.setAccessTokenValiditySeconds( (int) TimeUnit.DAYS.toSeconds(30)); // 30�?/span>
        endpoints.tokenServices(tokenServices);
    }

完成�q�些后，框架��׃��中间��生的数据写到mysql中了�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">oauth_client_details是client表，可以直接在该表中��d��记录来添加client:

4.4 需要注意的地方

�q�里不得不说 Spring 设计有一个奇葩地的方。注意看oauth_access_token表是存放讉K��令牌的，但是�q�没有直接在字段中存放token。Spring 使用OAuth2AccessToken来抽象与令牌有关的所有属性，在写入到数据库时�Q?strong style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 16px; vertical-align: baseline; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;">Spring��该对象通过JDK自带的序列化机制序列成字�?/strong>直接保存��C��该表�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">token字段中。也��是��_��如果只看数据表你是看不出access_token的值是多少�Q�过期时间等信息的。这��q��资源服务器的实现带来了麻烦。我们的资源提供方�ƈ没有使用Spring Security�Q�也不想引入 Spring Security 的�Q何依赖，�q�时候就只能��?nbsp;DefaultOAuth2AccessToken的源码copy到资源提供方的项目中�Q�然后读�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">token字段�q�反序列化还原对象来获取token信息。但是如果这样做�q�会遇到反序列化兼容性的问题�Q�具体解��x��法参考我另一��博�?http://blog.csdn.net/neosmith/article/details/52539614

5. �ȝ��

��x��一个能在生产环境下使用的授权服务就搭徏好了。其实我们在实际使用时应该适当定制JdbcTokenStore�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">ClientDetailsService来实适应业务需要，甚至可以直接�?开始实现接口，完全不用框架提供的实现。另外，Spring 直接��?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">DefaultOAuth2AccessToken序列化成字节保存到数据库中的设计�Q�我认�ؓ是非�怸�合理的。或许设计者的初衷是保�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">access_token�Q�但是通过加密的方法也可以实现�Q�完全不应该直接扔字节。不�q�通过定制TokenStore接口�Q�我们可以��用自��q��表结构而不拘惔于默认实现�?br />
http://blog.csdn.net/tracker_w/article/category/6360121

http://blog.csdn.net/neosmith/article/details/52539927

paulwong 2016-09-16 18:22 发表评论

使用Spring Cloud Feign作�ؓHTTP客户端调用远�E�HTTP服务

paulwong — Fri, 16 Sep 2016 10:13:00 GMT

在Spring Cloud Netflix栈中�Q�各个微服务都是以HTTP接口的�Ş式暴露自�w�服务的�Q�因此在调用�q�程服务时就必须使用HTTP客户端。我们可以��用JDK原生�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">URLConnection、Apache�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">Http Client、Netty的异步HTTP Client, Spring�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">RestTemplate。但是，用�v来最方便、最优雅的还是要属Feign了�?/p>

Feign��?/h1>
Feign是一�U�声明式、模板化的HTTP客户端。在Spring Cloud中��用Feign, 我们可以做到使用HTTP��h��q�程服务时能与调用本地方法一��L��~�码体验�Q�开发者完全感知不到这是远�E�方法，更感知不到这是个HTTP��h��。比如：
@Autowired
private AdvertGropRemoteService service; // �q�程服务

public AdvertGroupVO foo(Integer groupId) {
return service.findByGroupId(groupId); // 通过HTTP调用�q�程服务
}
开发者通过`service.findByGroupId()`��p��完成发送HTTP��h��和解码HTTP�q�回�l�果�q�封装成对象的过�E��?/p>

Feign的定�?/h1>
��Z��让Feign知道在调用方法时应该向哪个地址发请求以及请求需要带哪些参数�Q�我们需要定义一个接口：
@FeignClient(name = "ea")  //  [A]
public interface AdvertGroupRemoteService {

    @RequestMapping(value = "/group/{groupId}", method = RequestMethod.GET) // [B]
    AdvertGroupVO findByGroupId(@PathVariable("groupId") Integer adGroupId) // [C]

    @RequestMapping(value = "/group/{groupId}", method = RequestMethod.PUT)
    void update(@PathVariable("groupId") Integer groupId, @RequestParam("groupName") String groupName)
A: `@FeignClient`用于通知Feign�l��g对该接口�q�行代理(不需要编写接口实�?�Q��用者可直接通过`@Autowired`注入�?/p>
B: `@RequestMapping`表示在调用该�Ҏ��旉��要向`/group/{groupId}`发�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">GET��h��?/p>
C: `@PathVariable`�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">SpringMVC中对应注解含义相同�?/p>
Spring Cloud应用在启动时�Q�Feign会扫描标�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">@FeignClient注解的接口，生成代理�Q��ƈ注册到Spring容器中。生成代理时Feign会�ؓ每个接口�Ҏ��创徏一�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">RequetTemplate对象�Q�该对象��装了HTTP��h��需要的全部信息�Q�请求参数名、请求方法等信息都是在这个过�E�中��定的，Feign的模板化��׃��现在�q�里�?/p>
在本例中�Q�我们将Feign与Eureka和Ribbon�l�合使用�Q?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">@FeignClient(name = "ea")意�ؓ通知Feign在调用该接口�Ҏ��时要向Eureka中查询名�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">ea的服务，从而得到服务URL�?/p>

Feign的Encoder、Decoder和ErrorDecoder

Feign��方法签名中�Ҏ��参数对象序列化�ؓ��h��参数攑ֈ�HTTP��h��中的�q�程�Q�是��q��码器(Encoder)完成的。同理，��HTTP响应数据反序列化为java对象是由解码�?Decoder)完成的�?/p>

默认情况下，Feign会将标有@RequestParam注解的参数�{换成字符串添加到URL中，��没有注解的参数通过Jackson转换成json攑ֈ��h��体中。注意，如果�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">@RequetMapping中的method��请求方式指定�ؓPOST�Q�那么所有未标注解的参数��会被忽略，例如�Q?br />

@FeignClient(name = "ea")  //  [A]
public interface AdvertGroupRemoteService {

    @RequestMapping(value = "/group/{groupId}", method = RequestMethod.GET) // [B]
    AdvertGroupVO findByGroupId(@PathVariable("groupId") Integer adGroupId) // [C]

    @RequestMapping(value = "/group/{groupId}", method = RequestMethod.PUT)
    void update(@PathVariable("groupId") Integer groupId, @RequestParam("groupName") String groupName)

此时因�ؓ声明的是GET��h��没有��h��体，所�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">obj参数��׃��被忽略�?/p>

在Spring Cloud环境下，Feign的Encoder*只会用来�~�码没有��d��注解的参�?。如果你自定义了Encoder, 那么只有在编�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">obj参数时才会调用你的Encoder。对于Decoder, 默认会委托给SpringMVC中的MappingJackson2HttpMessageConverter�c�进行解码。只有当状态码不在200 ~ 300之间时ErrorDecoder才会被调用。ErrorDecoder的作用是可以�Ҏ��HTTP响应信息�q�回一个异常，该异常可以在调用Feign接口的地方被捕获到。我们目前就通过ErrorDecoder来��Feign接口抛出业务异常以供调用者处理�?/p>

Feign的HTTP Client

Feign在默认情况下使用的是JDK原生�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">URLConnection发送HTTP��h��Q�没有连接池�Q�但是对每个地址会保持一个长�q�接�Q�即利用HTTP�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">persistence connection 。我们可以用Apache的HTTP Client替换Feign原始的http client, 从而获取连接池、超时时间等与性能息息相关的控制能力。Spring Cloud�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">Brixtion.SR5版本开始支持这�U�替换，首先在项目中声明Apache HTTP Client�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">feign-httpclient依赖�Q?br />

@RequestMapping(value = "/group/{groupId}", method = RequestMethod.GET)
void update(@PathVariable("groupId") Integer groupId, @RequestParam("groupName") String groupName, DataObject obj);

然后�?code style="box-sizing: border-box; font-family: "Source Code Pro", monospace; font-size: 13.5px; padding: 2px 4px; color: #3f3f3f; white-space: nowrap; border-radius: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; word-break: break-word; background: rgba(128, 128, 128, 0.0745098);">application.properties中添加：

feign.httpclient.enabled=true

�ȝ��

通过Feign�Q?我们能把HTTP�q�程调用对开发者完全透明�Q�得��C��调用本地�Ҏ��一致的�~�码体验。这一点与阉K��Dubbo中暴露远�E�服务的方式�c�M��Q�区别在于Dubbo是基于私有二�q�制协议�Q�而Feign本质上还是个HTTP客户端。如果是在用Spring Cloud Netflix搭徏微服务，那么Feign无疑是最佳选择�?br />
http://blog.csdn.net/tracker_w/article/category/6360121
http://blog.csdn.net/neosmith/article/details/52449921

paulwong 2016-09-16 18:13 发表评论

微服务框架Spring Cloud

paulwong — Sun, 11 Sep 2016 12:49:00 GMT

2016

微服务框架Spring Cloud介绍 Part5: 在微服务�pȝ��中��用Hystrix, Hystrix Dashboard与Turbine

SEP 04

微服务框架Spring Cloud介绍 Part4: 使用Eureka, Ribbon, Feign实现REST服务客户�?/a>

AUG 25

微服务框架Spring Cloud介绍 Part3: Mysteam��目�l�构与开发用��h��册服�?/a>

AUG 10

微服务框架Spring Cloud介绍 Part2: Spring Cloud与微服务

AUG 03

微服务框架Finagle介绍 Part3: 在Finagle中开发基于Thrift协议的应�?/a>

MAY 02

微服务框架Finagle介绍 Part2: 在Finagle中开发基于Http协议的应�?/a>

MAY 01

微服务框架Spring Cloud介绍 Part1: 使用事�g和消息队列实现分布式事务

APR 21

微服务框架Finagle介绍 Part1: Future, Service, Filter

MAR 19

paulwong 2016-09-11 20:49 发表评论

JHipster

paulwong — Sun, 11 Sep 2016 08:40:00 GMT

��Z��SPRING CLOUD的微服务框架
http://jhipster.cn/

paulwong 2016-09-11 16:40 发表评论

spring cloud��目��d��配置��理

paulwong — Sun, 11 Sep 2016 08:26:00 GMT

摘要
spring cloud config server配置好了数据库连接信息，�q�个��目��d��config�Q�获取连接信息。这里以mybtis作�ؓ列子。从服务器读取jdbc信息后，�q�行mybatis�E�序�?br />
��认服务是否成功
http://localhost:8888/demo-config/test

{"name":"demo-config","profiles":["test"],"label":"master","version":"02d28ad4925aa9bd1bf8a48d2edbf04ce61aa45a","propertySources":[{"name":"https://git.oschina.net/penghaozhong/demo.git/demo-config-repo/demo-config-test.properties","source":{"jdbc.url":"jdbc:mysql://localhost:3306/demo?characterEncoding=UTF-8","jdbc.username":"root","jdbc.driver":"com.mysql.jdbc.Driver","jdbc.password":"xxxxxx","jdbc.type":"mysql"}}]}

2. 配置��d��配置文�g

在bootstrap.properties中添加读取配�|�管理的地址�?br />
3. ��d��配置文�g属性，�q�里采用@ConfigurationProperties

/**
* ��d��数据库配�|�文�?br /> * @author penghaozhong
*
*/
@ConfigurationProperties(prefix = DataSourceProperties.PREFIX, ignoreUnknownFields = false)
public  class  DataSourceProperties {

        public DataSourceProperties() {
        super();
    }
        //对应配置文�g里的配置�?/span>
        public final static String PREFIX="jdbc";

        private String type;
        private String driver;
        private String url;
        private String username;
        private String password;

        public String getType() {
            return type;
        }
        public void setType(String type) {
            this.type = type;
        }
        public String getDriver() {
            return driver;
        }
        public void setDriver(String driver) {
            this.driver = driver;
        }
        public String getUrl() {
            return url;
        }
        public void setUrl(String url) {
            this.url = url;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }

}

4. 配置mybatis

@Configuration
@MapperScan("com.phz.test.spring.cloud.demo")
@EnableConfigurationProperties(DataSourceProperties.class)
@EnableTransactionManagement
public class MybatisDataSource {

    // mybaits mapper xml搜烦路径
    private final static String MAPPERLOCATIONS = "classpath:/mappings/**/*.xml";
    private final static String CONFIGLOCATION = "classpath:/mybatis-config.xml";

    @Autowired
    private  DataSourceProperties dataSourceProperties;
    private DruidDataSource datasource = null;

    @Bean(destroyMethod = "close")
    public  DataSource dataSource(){
        datasource = new DruidDataSource();
        datasource.setUrl(dataSourceProperties.getUrl());
        datasource.setDbType(dataSourceProperties.getType());
        datasource.setDriverClassName(dataSourceProperties.getDriver());
        datasource.setUsername(dataSourceProperties.getUsername());
        datasource.setPassword(dataSourceProperties.getPassword());
        return datasource;
    }

    @PreDestroy
    public void close() {
        if(datasource != null){
            datasource.close();
        }
    }

    @Bean
    public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource());
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sqlSessionFactoryBean.setMapperLocations(resolver.getResources(MAPPERLOCATIONS));
        sqlSessionFactoryBean.setConfigLocation(resolver.getResource(CONFIGLOCATION));
        sqlSessionFactoryBean.setTypeAliasesPackage("com.phz.test.spring.cloud.demo.entity");
        return sqlSessionFactoryBean.getObject();
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }

}

paulwong 2016-09-11 16:26 发表评论

MICROSERVICE 资源

paulwong — Thu, 01 Sep 2016 13:46:00 GMT

Spring Cloud 为开发者提供了在分布式�pȝ��Q�如配置��理、服务发现、断路器、智能�\由、微代理、控制�ȝ��、一�ơ�?Token、全局锁、决�{�竞选、分布式会话和集��状态）操作的开发工兗��?Spring Cloud 开发者可以快速实��C��q�这些模式�?br />
主要有eureka做服务发现、config做分布式配置、zuul做api-gateway、feign做客��L��负蝲均衡、hystrix做断路器、turbine做聚合的monitor、graphite做指标监控�?/span>

http://blog.csdn.net/liaokailin/article/category/6212338

MICROSERVICE WITH SPRING-CLOUD.
https://github.com/kennyk65/Microservices-With-Spring-Student-Files

!!!spring-cloud-study
http://git.oschina.net/itmuch/spring-cloud-study

paulwong 2016-09-01 21:46 发表评论