在使用wx-java-mp-starter 中理解springboot-starter笔记_wx-java-mp-spring-boot-starter

一. 简介：

当我们使用一个spring外部组件时，通常需要依赖多个不同的jar包，spring-boot-starter能够整合所需要的依赖组件，通过根据模块内的环境进行自动配置，使用者只需要引入starter坐标，不需要过多的依赖及配置就可以使用

1.它整合了这个模块需要的依赖库；
2.提供对模块的配置项给使用者；
3.提供自动配置类对模块内的Bean进行自动装配；

例如：使用微信公众号开源脚手架只需要引入下面的wx-java-mp-starter依赖即可，不需要手动对其其他组件依赖

二. 编写starter开发步骤

 1.新建maven项目，并添加以下依赖

    <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-autoconfigure</artifactId>
      <version>${spring.boot.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
      <version>${spring.boot.version}</version>
      <optional>true</optional>
    </dependency>
    <dependency>

 

其中 spring-boot-configuration-processor 的作用是编译时生成 spring-configuration-metadata.json ，此文件主要给IDE使用。如当配置此jar相关配置属性在 application.yml ，你可以用ctlr+鼠标左键点击属性名，IDE会跳转到你配置此属性的类中。

spring官方starter一般采取spring-boot-starter-{name}的命名方式，如spring-boot-starter-web,非官方建议artifactId命名遵循{name}-spring-boot-starter, wx-java-mp-starter的命名如下：

wx-java-mp-starter

2. 新建配置类（微信app相关信息配置类）

package com.binarywang.spring.starter.wxjava.mp;
 
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
 
import java.io.Serializable;
 
import static com.binarywang.spring.starter.wxjava.mp.WxMpProperties.PREFIX;
import static com.binarywang.spring.starter.wxjava.mp.WxMpProperties.StorageType.memory;
 
 
/**
 * 微信接入相关配置属性
 */
@Data
@ConfigurationProperties(PREFIX)
public class WxMpProperties {
  public static final String PREFIX = "wx.mp";
 
  /**
   * 设置微信公众号的appid
   */
  private String appId;
 
  /**
   * 设置微信公众号的app secret
   */
  private String secret;
 
  /**
   * 设置微信公众号的token
   */
  private String token;
 
  /**
   * 设置微信公众号的EncodingAESKey
   */
  private String aesKey;
 
  /**
   * 存储策略, memory, redis
   */
  private ConfigStorage configStorage = new ConfigStorage();
 
 
  @Data
  public static class ConfigStorage implements Serializable {
 
    private StorageType type = memory;
 
    private RedisProperties redis = new RedisProperties();
 
  }
 
  public enum StorageType {
    memory, redis
  }
}

package com.binarywang.spring.starter.wxjava.mp;
 
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
 
import java.io.Serializable;
 
import static com.binarywang.spring.starter.wxjava.mp.WxMpProperties.PREFIX;
import static com.binarywang.spring.starter.wxjava.mp.WxMpProperties.StorageType.memory;
 
 
/**
 * 微信接入相关配置属性
 */
@Data
@ConfigurationProperties(PREFIX)
public class WxMpProperties {
  public static final String PREFIX = "wx.mp";
 
  /**
   * 设置微信公众号的appid
   */
  private String appId;
 
  /**
   * 设置微信公众号的app secret
   */
  private String secret;
 
  /**
   * 设置微信公众号的token
   */
  private String token;
 
  /**
   * 设置微信公众号的EncodingAESKey
   */
  private String aesKey;
 
  /**
   * 存储策略, memory, redis
   */
  private ConfigStorage configStorage = new ConfigStorage();
 
 
  @Data
  public static class ConfigStorage implements Serializable {
 
    private StorageType type = memory;
 
    private RedisProperties redis = new RedisProperties();
 
  }
 
  public enum StorageType {
    memory, redis
  }
}

3. 新建总配置类，用于springboot 加载配置

第一步:  SpringBoot 在启动时会去依赖的starter包中寻找 resources/META-INF/spring.factories 文件，然后根据文件中配置的Jar包去扫描项目所依赖的Jar包，这类似于 Java 的 SPI 机制，此类将配置在spring.factories中

第二步:  根据 spring.factories配置加载AutoConfigure类。

最后，根据 @Conditional注解的条件，进行自动配置并将Bean注入Spring Context 上下文当中。

我们也可以使用@ImportAutoConfiguration({MyServiceAutoConfiguration.class}) 指定自动配置哪些类。

package com.binarywang.spring.starter.wxjava.mp;
 
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
 
@Configuration
@EnableConfigurationProperties(WxMpProperties.class)
@Import({WxMpStorageAutoConfiguration.class, WxMpServiceAutoConfiguration.class})
public class WxMpAutoConfiguration {
}

4.新建导入配置类即第三步中的Import所导入的类，因application包扫描扫描并未配置第三方jar引用，所以通过import的方式将实例注到spring容器

package com.binarywang.spring.starter.wxjava.mp;
 
import me.chanjar.weixin.mp.api.WxMpConfigStorage;
import me.chanjar.weixin.mp.api.WxMpService;
import me.chanjar.weixin.mp.api.impl.WxMpServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
/**
 * 微信公众号相关服务自动注册
 */
@Configuration
public class WxMpServiceAutoConfiguration {
    @Autowired
    private ApplicationContext ctx;
 
    @Bean
    @ConditionalOnMissingBean//通过此注解，可以自已实现一个WxMpConfigStorage来替换此存储策略
    public WxMpService wxMpService(WxMpConfigStorage configStorage) {
        WxMpService wxMpService = new WxMpServiceImpl();
        wxMpService.setWxMpConfigStorage(configStorage);
        registerWxMpSubService(wxMpService);
        return wxMpService;
    }
 
    @ConditionalOnBean(WxMpService.class)
    public Object registerWxMpSubService(WxMpService wxMpService) {
        //进行bean单例注册，注册后可注入使用
        ConfigurableListableBeanFactory factory = (ConfigurableListableBeanFactory) ctx.getAutowireCapableBeanFactory();
        factory.registerSingleton("wxMpKefuService", wxMpService.getKefuService());
        factory.registerSingleton("wxMpMaterialService", wxMpService.getMaterialService());
        factory.registerSingleton("wxMpMenuService", wxMpService.getMenuService());
        factory.registerSingleton("wxMpUserService", wxMpService.getUserService());
        factory.registerSingleton("wxMpUserTagService", wxMpService.getUserTagService());
        factory.registerSingleton("wxMpQrcodeService", wxMpService.getQrcodeService());
        factory.registerSingleton("wxMpCardService", wxMpService.getCardService());
        factory.registerSingleton("wxMpDataCubeService", wxMpService.getDataCubeService());
        factory.registerSingleton("wxMpUserBlacklistService", wxMpService.getBlackListService());
        factory.registerSingleton("wxMpStoreService", wxMpService.getStoreService());
        factory.registerSingleton("wxMpTemplateMsgService", wxMpService.getTemplateMsgService());
        factory.registerSingleton("wxMpSubscribeMsgService", wxMpService.getSubscribeMsgService());
        factory.registerSingleton("wxMpDeviceService", wxMpService.getDeviceService());
        factory.registerSingleton("wxMpShakeService", wxMpService.getShakeService());
        factory.registerSingleton("wxMpMemberCardService", wxMpService.getMemberCardService());
        factory.registerSingleton("wxMpMassMessageService", wxMpService.getMassMessageService());
        return Boolean.TRUE;
    }
 
}

package com.binarywang.spring.starter.wxjava.mp;
 
import me.chanjar.weixin.mp.api.WxMpConfigStorage;
import me.chanjar.weixin.mp.api.WxMpInMemoryConfigStorage;
import me.chanjar.weixin.mp.api.WxMpInRedisConfigStorage;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
 
/**
 * 微信公众号存储策略自动配置
 */
@Configuration
public class WxMpStorageAutoConfiguration {
 
    @Autowired
    private WxMpProperties properties;
 
    @Autowired(required = false)
    private JedisPool jedisPool;
 
    @Bean
    @ConditionalOnMissingBean(WxMpConfigStorage.class)
    public WxMpConfigStorage wxMpInMemoryConfigStorage() {
        WxMpProperties.ConfigStorage storage = properties.getConfigStorage();
        WxMpProperties.StorageType type = storage.getType();
 
        if (type == WxMpProperties.StorageType.redis) {
            return getWxMpInRedisConfigStorage();
        }
        return getWxMpInMemoryConfigStorage();
    }
 
    private WxMpInMemoryConfigStorage getWxMpInMemoryConfigStorage() {
        WxMpInMemoryConfigStorage config = new WxMpInMemoryConfigStorage();
        setWxMpInfo(config);
        return config;
    }
 
    private WxMpInRedisConfigStorage getWxMpInRedisConfigStorage() {
        JedisPool poolToUse = jedisPool;
        if (poolToUse == null) {
            poolToUse = getJedisPool();
        }
        WxMpInRedisConfigStorage config = new WxMpInRedisConfigStorage(poolToUse);
        setWxMpInfo(config);
        return config;
    }
 
    private void setWxMpInfo(WxMpInMemoryConfigStorage config) {
        config.setAppId(properties.getAppId());
        config.setSecret(properties.getSecret());
        config.setToken(properties.getToken());
        config.setAesKey(properties.getAesKey());
    }
 
    private JedisPool getJedisPool() {
        WxMpProperties.ConfigStorage storage = properties.getConfigStorage();
        RedisProperties redis = storage.getRedis();
 
        JedisPoolConfig config = new JedisPoolConfig();
        if (redis.getMaxActive() != null) {
            config.setMaxTotal(redis.getMaxActive());
        }
        if (redis.getMaxIdle() != null) {
            config.setMaxIdle(redis.getMaxIdle());
        }
        if (redis.getMaxWaitMillis() != null) {
            config.setMaxWaitMillis(redis.getMaxWaitMillis());
        }
        if (redis.getMinIdle() != null) {
            config.setMinIdle(redis.getMinIdle());
        }
        config.setTestOnBorrow(true);
        config.setTestWhileIdle(true);
 
        JedisPool pool = new JedisPool(config, redis.getHost(), redis.getPort(),
                redis.getTimeout(), redis.getPassword(), redis.getDatabase());
        return pool;
    }
}

5. 最后一步，在resources/META-INF/下创建spring.factories文件，并添加如下内容：

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.binarywang.spring.starter.wxjava.mp.WxMpAutoConfiguration

 org.springframework.boot.autoconfigure.EnableAutoConfiguration后面的类名为装配的配置类，引入多个使用逗号分开;
springboot启动时会通过org.springframework.core.io.support.SpringFactoriesLoader读取classpath下每个Starter的spring.factories文件，加载自动装配类进行Bean的自动装配

6. 关于配置中的注解解释

        6.1 conditions相关注解

        6.2 其他注解       

@EnableConfigurationProperties 作用是：使ConfigurationProperties注解生效

@ConfigurationProperties 将配置文件中的属性值映射到类中

           @Import  通过导入的方式实现把实例加入springIOC容器中

 

三. 使用方式

<dependency>
		<groupId>com.github.binarywang</groupId>
		<artifactId>wx-java-mp-starter</artifactId>
		<version>${weixin-java-mp.version}</version>
</dependency>

package com.rograndec.crm.service.wxcoupon.impl;
 
import com.rograndec.crm.service.wxcoupon.WeiXinCouponService;
import me.chanjar.weixin.mp.api.WxMpCardService;
import org.springframework.beans.factory.annotation.Autowired;
 
/**
 * @author ping.zhu
 * @date 2019-06-03 20:08
 * @description
 */
 
public class WeiXinCouponServiceImpl implements WeiXinCouponService {
 
	@Autowired
	private WxMpCardService wxMpCardService;
 
}