Create README.md

README.md

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+# dubbo-spring-java-config-comsumer
+
+##　说明
+有几个坑
+### spring 依赖问题
+ 在dubbo依赖于spring2,如果集成spring3会有依赖冲突问题,需要添加依赖解决．
+```
+		<dependency>
+			<groupId>com.alibaba</groupId>
+			<artifactId>dubbo</artifactId>
+			<version>2.5.3</version>
+			        <exclusions>  
+                <exclusion>  
+                    <artifactId>spring</artifactId>  
+                    <groupId>org.springframework</groupId>  
+                </exclusion>  
+            </exclusions>  
+		</dependency
+```
+
+### 版本不一致的问题
+如果服务端(服务提供者设置了版本信息)，则需要保持版本一致
+```
+	// 服务提供者暴露服务配置
+	@Bean
+	public ServiceConfig<DemoService> service(){
+	ServiceConfig<DemoService> service = new ServiceConfig<DemoService>(); // 此实例很重，封装了与注册中心的连接，请自行缓存，否则可能造成内存和连接泄漏
+	service.setApplication(application());
+	service.setRegistry(registry()); // 多个注册中心可以用setRegistries()
+	service.setProtocol(protocol()); // 多个协议可以用setProtocols()
+	service.setInterface(DemoService.class);
+	service.setVersion("1.0.0");   // 服务版本
+	service.setRef(demoService());
+	service.export();
+	
+	return service;
+	}
+```
+
+```
+	// 服务引用　配置,需要与服务提供者版本保持一致
+	@Bean
+	public ReferenceConfig<DemoService> reference(){
+		ReferenceConfig<DemoService> reference = new ReferenceConfig<DemoService>();
+		reference.setApplication(application());
+		reference.setRegistry(registry());
+		reference.setProtocol("dubbo");
+		reference.setInterface(DemoService.class);
+		reference.setId("demoService");
+		reference.setVersion("1.0.0");   // 这行必须要有
+		
+		return reference;
+		
+	}
+```
+
+如果不一致，会报下面的错误
+```
+Exception in thread "main" java.lang.IllegalStateException: Failed to check the status of the service com.niejinkun.dubbo.spring4start.service.DemoService. No provider available for the service com.niejinkun.dubbo.spring4start.service.DemoService from the url zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=demoService-comsumer&dubbo=2.5.3&interface=com.niejinkun.dubbo.spring4start.service.DemoService&methods=sayHello&pid=2432&protocol=dubbo&side=consumer&timestamp=1457964636762 to the consumer 192.168.1.236 use dubbo version 2.5.3
+	at com.alibaba.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:420)
+	at com.alibaba.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:300)
+	at com.alibaba.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:138)
+	at com.niejinkun.dubbo.spring4start.App.main(App.java:24)
+
+```
+
+## 完整配置代码
+```
+package com.niejinkun.dubbo.spring4start.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.alibaba.dubbo.config.ApplicationConfig;
+import com.alibaba.dubbo.config.ProtocolConfig;
+import com.alibaba.dubbo.config.ReferenceConfig;
+import com.alibaba.dubbo.config.RegistryConfig;
+import com.alibaba.dubbo.config.ServiceConfig;
+import com.alibaba.dubbo.config.annotation.Reference;
+import com.niejinkun.dubbo.spring4start.service.DemoService;
+
+@Configuration
+public class DubboConfig {
+
+	// 当前应用配置
+	@Bean
+	public ApplicationConfig application() {
+		ApplicationConfig application = new ApplicationConfig();
+		application.setName("demoService-comsumer");
+
+		return application;
+	}
+
+	// 连接注册中心
+	@Bean
+	public RegistryConfig registry() {
+		RegistryConfig registry = new RegistryConfig();
+		registry.setProtocol("zookeeper");
+		registry.setAddress("zookeeper://127.0.0.1:2181");
+/*		registry.setUsername("aaa");
+		registry.setPassword("bbb");*/
+		return registry;
+	}
+	
+	// 服务提供者协议配置
+	@Bean
+	public ProtocolConfig protocol(){
+	ProtocolConfig protocol = new ProtocolConfig();
+	protocol.setName("dubbo");
+	protocol.setPort(20880);
+	protocol.setThreads(200);
+	
+	return protocol;
+	}
+	// 注意：ServiceConfig为重对象，内部封装了与注册中心的连接，以及开启服务端口
+	 
+/*	// 服务提供者暴露服务配置
+	@Bean
+	public ServiceConfig<DemoService> service(){
+	ServiceConfig<DemoService> service = new ServiceConfig<DemoService>(); // 此实例很重，封装了与注册中心的连接，请自行缓存，否则可能造成内存和连接泄漏
+	service.setApplication(application());
+	service.setRegistry(registry()); // 多个注册中心可以用setRegistries()
+	service.setProtocol(protocol()); // 多个协议可以用setProtocols()
+	service.setInterface(DemoService.class);
+	service.setVersion("1.0.0");
+	
+	return service;
+	}*/
+	
+	// 服务引用　配置,需要与服务提供者版本保持一致
+	@Bean
+	public ReferenceConfig<DemoService> reference(){
+		ReferenceConfig<DemoService> reference = new ReferenceConfig<DemoService>();
+		reference.setApplication(application());
+		reference.setRegistry(registry());
+		reference.setProtocol("dubbo");
+		reference.setInterface(DemoService.class);
+		reference.setId("demoService");
+		//reference.setVersion("1.0.0");   // 这行必须要有
+		
+		return reference;
+		
+	}
+	
+/*	@Bean
+	public DemoService demoService(){
+		return reference().get();
+	}
+	 */
+
+}
+
+```