我眼中的服务提供和服务消费

服务提供和消费脑图

服务提供和消费脑图

参见: 服务提供者, 服务消费者, 服务注册中心

服务提供者

1.服务提供者启动，解析xml文件中配置的服务，这里使用Dom4j解析。

2.将服务的一些相关信息注册到 服务注册中心。

注：服务相关信息：服务中心接口url，接口名称，方法名称，参数信息。

3.提供一个接口，服务消费者通过调用这个接口url来调用相应的服务。

参见: 服务提供和消费脑图, 服务注册中心 (1.注册服务), 服务消费者 (3.调用服务)

服务消费者

1.服务消费者启动，使用dom4j解析xml获取要消费的服务相关接口。

2.根据接口信息去服务注册中心判断是否有对应的注册信息，如果有则通过jdk动态代理生成相应的代理类并注册到spring中（代理方法中会根据服务中心返回的信息（服务提供者的url）去调用服务提供者对应的服务）。

参见: 服务提供和消费脑图, 服务注册中心 (2.消费服务), 服务提供者 (3.调用服务)

服务注册中心

1.将来自服务提供者信息存储到redis。

2.将服务信息提供给服务消费者。

参见: 服务提供者 (1.注册服务), 服务消费者 (2.消费服务), 服务提供和消费脑图

工程示例

　　注：示例中为了简单，采用rest请求方式来代替socket连接

　　注册中心

@RestController
@RequestMapping("index")
public class IndexController {

    @Autowired
    private RedisCacheTemplate redisCacheTemplate;
　　 //注册服务提供者信息，将信息放到redis中
    @RequestMapping(value = "register", method = RequestMethod.POST)
    public SimpleResponse register(@RequestBody RegisterMessage registerMessage) {
        try {
            Map<String, Object> map = new HashMap<>();
            for (InterfaceMessage interfaceMessage : registerMessage.getInterfaceMessageList()) {
                interfaceMessage.setProviderUrl(registerMessage.getProviderUrl());
                map.put(ToStringBuilder.reflectionToString(interfaceMessage, ToStringStyle.SHORT_PREFIX_STYLE), true);
            }
            redisCacheTemplate.batchPut(map);
            return SimpleResponse.success(map.size());
        } catch (Exception e) {
            e.printStackTrace();
            return SimpleResponse.error(e.getMessage());
        }
    }

　　 //消费者拿到配置的服务信息到注册中心来匹配，验证是否存在这个服务
    @RequestMapping(value = "contains", method = RequestMethod.POST)
    public SimpleResponse contains(@RequestBody InterfaceMessage interfaceMessage) {
        try {
            if(redisCacheTemplate.exist(ToStringBuilder.reflectionToString(interfaceMessage, ToStringStyle.SHORT_PREFIX_STYLE))) {
                return SimpleResponse.success(true);
            } else {
                return SimpleResponse.error(null);
            }
        } catch (Exception e) {
            e.printStackTrace();
            return SimpleResponse.error(e.getMessage());
        }
    }

    @RequestMapping(value = "test", method = {RequestMethod.GET, RequestMethod.POST})
    public SimpleResponse test(@RequestParam String providerUrl){
        return SimpleResponse.success(providerUrl);
    }
}

　　服务提供者

<?xml version="1.0" encoding="UTF-8"?>
<services-provider>
    <service id="testService" interface="com.hjzgg.simulation.api.ITestService"/>
</services-provider>

　　自定义xml，配置将要注册的服务id及对应的接口类。

# 内置tomcat服务器配置
server.port=8088
server.context-path=/provider-server

#打印彩色日志
spring.output.ansi.enabled=always

# 日志打印级别
logging.level.root=debug

# service
service.xml.path=classpath:service-provider.xml 自定义服务提供者配置文件 位置
service.provider.path=http://localhost:8088/provider-server/index/provider  服务提供者执行相应服务接口
service.register.path=http://localhost:8090/register-server/index/register  调用注册中心 接口

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.hjzgg.simulation.common.node.InterfaceMessage;
import com.hjzgg.simulation.common.node.RegisterMessage;
import com.hjzgg.simulation.common.parsexml.BeanNode;
import com.hjzgg.simulation.common.parsexml.ParseServiceXML;
import com.hjzgg.simulation.common.response.ReturnCode;
import com.hjzgg.simulation.common.utils.RestTemplateUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.http.MediaType;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.List;

public class Registrar implements ImportBeanDefinitionRegistrar, EnvironmentAware {
    private static Logger logger = LoggerFactory.getLogger(Registrar.class);

    private String servicesXmlPath;
    private String serviceProviderPath;
    private String serviceRegisterPath;

    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        List<BeanNode> beanNodes = ParseServiceXML.getProviderServices(servicesXmlPath); 解析自定义服务提供配置文件
        List<InterfaceMessage> list = new ArrayList<>();
        for(BeanNode beanNode : beanNodes) { 根据服务对应id去 寻找实现的 bean
            if(!registry.containsBeanDefinition(beanNode.getBeanName())) {
                logger.error("接口" + beanNode.getBeanName() + " " + beanNode.getInterfaceCls().getTypeName() + " 没有对应的实现类");
            } else {
                InterfaceMessage interfaceMessage = new InterfaceMessage();
                interfaceMessage.setBeanName(beanNode.getBeanName());
                interfaceMessage.setInterfacType(beanNode.getInterfaceCls().getTypeName());
                list.add(interfaceMessage);
            }
        }
        if(!CollectionUtils.isEmpty(list)) { 将配置的服务信息发送的注册中心
            RegisterMessage registerMessage = new RegisterMessage();
            registerMessage.setProviderUrl(this.serviceProviderPath);
            registerMessage.setInterfaceMessageList(list);
            try {
                String result = RestTemplateUtils.post(this.serviceRegisterPath, (JSONObject) JSON.toJSON(registerMessage), MediaType.APPLICATION_JSON_UTF8);
                JSONObject retJson = JSONObject.parseObject(result);
                if(retJson.getInteger("code") == ReturnCode.SUCCESS.getValue()) {
                    logger.debug("服务注册成功...");
                } else {
                    logger.error("服务注册失败..." + retJson.getString("msg"));
                }
            } catch (Exception e) {
                e.printStackTrace();
                logger.error("服务注册失败..." + e.getMessage());
            }
        }
    }

    @Override
    public void setEnvironment(Environment environment) { 获取环境变量
        this.servicesXmlPath = environment.getProperty("service.xml.path");
        this.serviceProviderPath = environment.getProperty("service.provider.path");
        this.serviceRegisterPath = environment.getProperty("service.register.path");

        assert(StringUtils.isNotEmpty(this.serviceProviderPath) && StringUtils.isNotEmpty(serviceRegisterPath) &&
        StringUtils.isNotEmpty(this.servicesXmlPath));
    }
}

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

/**
 * Created by hujunzheng on 2017/7/7.
 */

@Configuration
@Import(Registrar.class)
public class Config { 注册服务配置启动
}

import com.hjzgg.simulation.common.node.ServiceMessage;
import com.hjzgg.simulation.common.response.SimpleResponse;
import com.hjzgg.simulation.common.utils.ContextUtils;
import com.hjzgg.simulation.common.utils.SerializeUtil;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by hujunzheng on 2017/7/8.
 */
@RestController
@RequestMapping("index")
public class IndexController {

　　 服务提供者执行相应服务接口
    @RequestMapping(value = "invoke", method = RequestMethod.POST)
    public Object invoke(@RequestParam String serviceMessageBody) {
        try {
　　　　　　　根据消费者传递的服务信息 找到对应的服务bean以及方法，并利用反射执行方法，最后返回结果
            ServiceMessage serviceMessage = (ServiceMessage) SerializeUtil.unserialize(Hex.decodeHex(serviceMessageBody.toCharArray()));
            Object bean = null;
            if((bean = ContextUtils.getBean(serviceMessage.getBeanName(), serviceMessage.getRequireType())) != null) {
                List<Class<?>> classList = new ArrayList<>();
                if(serviceMessage.getArgs() != null) {
                    for (Object obj : serviceMessage.getArgs()) {
                        classList.add(obj.getClass());
                    }
                }
                Method method = ReflectionUtils.findMethod(bean.getClass(), serviceMessage.getMethodName(), classList.toArray(new Class<?>[0]));
                if(method != null) {
                    return method.invoke(bean, serviceMessage.getArgs());
                } else {
                    return SimpleResponse.error("服务" + serviceMessage.getRequireType().getTypeName() + "中没有对应参数"
                            + ToStringBuilder.reflectionToString(classList) + "的" + serviceMessage.getMethodName() + "方法");
                }
            } else {
                return SimpleResponse.error("没有名称为" + serviceMessage.getBeanName() + "且类型为"
                        + serviceMessage.getRequireType().getTypeName() + "对应的bean");
            }
        } catch (Exception e) {
            e.printStackTrace();
            return SimpleResponse.error(e.getMessage());
        }
    }

}

　　服务消费者

<?xml version="1.0" encoding="UTF-8"?>
<services-consumer>
    <service ref="testService" interface="com.hjzgg.simulation.api.ITestService" url="http://localhost:8088/provider-server/index/provider"/>
</services-consumer>

　　自定义服务消费者配置，服务引用名称，接口类型，调用服务提供者URL

# 内置tomcat服务器配置
server.port=8089
server.context-path=/consumer-server

#打印彩色日志
spring.output.ansi.enabled=always

# 日志打印级别
logging.level.root=debug

# service xml
service.xml.path=classpath:service-consumer.xml 自定义服务消费配置文件位置
service.contains.url=http://localhost:8090/register-server/index/contains 注册中心服务查询接口
service.invoke.url=http://localhost:8088/provider-server/index/invoke 服务提供者执行相应服务接口

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.hjzgg.simulation.common.dynamic.JdkDynamicProxy;
import com.hjzgg.simulation.common.node.InterfaceMessage;
import com.hjzgg.simulation.common.parsexml.BeanNode;
import com.hjzgg.simulation.common.parsexml.ParseServiceXML;
import com.hjzgg.simulation.common.register.SpringBeanRegister;
import com.hjzgg.simulation.common.response.ReturnCode;
import com.hjzgg.simulation.common.utils.RestTemplateUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.http.MediaType;

import java.util.Iterator;
import java.util.List;

public class Registrar implements ImportBeanDefinitionRegistrar, EnvironmentAware{

    private Logger logger = LoggerFactory.getLogger(Registrar.class);

    private String servicesXmlPath;
    private String serviceContainsPath;

    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
　　　　　解析自定义服务消费配置文件
        List<BeanNode> beanNodes = ParseServiceXML.getConsumerServices(servicesXmlPath);
        判断注册中心 是否注册了这个服务了
        for(Iterator<BeanNode> it = beanNodes.iterator(); it.hasNext(); ) {
            BeanNode beanNode = it.next();
            InterfaceMessage interfaceMessage = new InterfaceMessage();
            interfaceMessage.setProviderUrl(beanNode.getUrl());
            interfaceMessage.setInterfacType(beanNode.getInterfaceCls().getTypeName());
            interfaceMessage.setBeanName(beanNode.getBeanName());

            try {
                String result = RestTemplateUtils.post(this.serviceContainsPath, (JSONObject) JSON.toJSON(interfaceMessage), MediaType.APPLICATION_JSON_UTF8);
                JSONObject retJson = JSON.parseObject(result);
                if (retJson.getInteger("code") == ReturnCode.FAILURE.getValue()) {
                    it.remove();

                    logger.error(interfaceMessage.getBeanName() + "对应类型" + interfaceMessage.getInterfacType() + "的服务在" +
                    interfaceMessage.getProviderUrl() + "上没有注册");
                }
            } catch (Exception e) {
                e.printStackTrace();
                logger.error("服务" + interfaceMessage.getBeanName() + "对应类型" + interfaceMessage.getInterfacType() + "查找失败..." + e.getMessage());
            }
        }
　　　　 将与注册中心一直的服务 以 动态代理的方式 注册到spring中
        SpringBeanRegister.registerBean(importingClassMetadata, registry, beanNodes);
    }

    @Override
    public void setEnvironment(Environment environment) { 设置环境变量
        this.servicesXmlPath = environment.getProperty("service.xml.path");
        this.serviceContainsPath = environment.getProperty("service.contains.url");
        String serviceInvokePath = environment.getProperty("service.invoke.url");

        assert(StringUtils.isNotEmpty(serviceContainsPath) && StringUtils.isNotEmpty(this.servicesXmlPath)
            && StringUtils.isNotEmpty(serviceInvokePath));

        JdkDynamicProxy.setServerProviderInvokeUrl(serviceInvokePath);
    }
}

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

/**
 * Created by hujunzheng on 2017/7/7.
 */

@Configuration
@Import(Registrar.class)
public class Config {
}

 　　测试一下

　　api接口

import com.alibaba.fastjson.JSONObject;

/**
 * Created by hujunzheng on 2017/7/7.
 */
public interface ITestService {
    JSONObject testService();
}

　　服务提供者对应的实例

import com.alibaba.fastjson.JSONObject;
import com.hjzgg.simulation.api.ITestService;
import org.springframework.stereotype.Service;

/**
 * Created by hujunzheng on 2017/7/8.
 */
@Service("testService")
public class TestServiceImpl implements ITestService {
    @Override
    public JSONObject testService() {
        JSONObject result = new JSONObject();
        result.put("name", "hujunzheng");
        result.put("age", 25);
        return result;
    }
}

　　消费者对应的测试

import com.hjzgg.simulation.api.ITestService;
import com.hjzgg.simulation.common.response.SimpleResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by hujunzheng on 2017/7/9.
 */
@RestController
@RequestMapping("index")
public class ConsumerController {

    @Autowired
    private ITestService testService;


    @RequestMapping("test")
    public SimpleResponse test() {
        try {
            return SimpleResponse.success(testService.testService());
        } catch (Exception e) {
            e.printStackTrace();
            return SimpleResponse.error(e.getMessage());
        }
    }
}

　　这就是我的实现方式，就说到这里了。最后我想说，思路很重要，掌握的知识很重要，多积累，多思考，任重而道远。最后附上我从中积累的知识和经验。

知识和经验

　　执行顺序及ProxyFactoryBean实现

　　

 

　　Public class ProxyFactoryBean implements FactoryBean, InitializingBean;

　　方法执行顺序 getObjectType->afterPropertiesSet->getObject

　　bean 的属性设置的 先于 getObjectType

 

　　Springboot 工程自定义jar包中获取上下文工具类

　　

　　要加上 @Component注解

 

　　实体类型（例如下面）网络传输方法，避免字符串编码格式问题

　　发送请求

ServiceMessage serviceMessage = new ServiceMessage();
。。。。。

JSONObject params = new JSONObject();
params.put("serviceMessageBody", Hex.encodeHexString(SerializeUtil.serialize(serviceMessage)));

Class<?> returnType = method.getReturnType();
return RestTemplateUtils.post(SERVER_PROVIDER_INVOKE_URL, params, MediaType.APPLICATION_FORM_URLENCODED, returnType);

　　接收请求

@RequestMapping(value = "invoke", method = RequestMethod.POST)

public Object invoke(@RequestParam String serviceMessageBody) {

    try {

        ServiceMessage serviceMessage = (ServiceMessage) SerializeUtil.unserialize(Hex.decodeHex(serviceMessageBody.toCharArray()));

      。。。。。 

}

　　参考工具类

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
</dependency>

　　Hex实现十六进制字符串和byte[]之间的转换，另附RestTemplateUtils工具链接

 

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