前言
前面我已经介绍了dubbo的一些基本工具和知识,让大家简单的了解了下RPC框架和Dubbo。接下来就是重点了,Dubbo的helloworld项目。
一、搭建项目
首先我们新建三个maven项目如下图:
- dubbo-provider(服务提供者)
- dubbo-api(api提供者)
- dubbo-consumer(消费者)
OKOK!这里我们再简单介绍下API项目。我前面说了,只有消费者和生产者是没错的。but你想啊,你在生产者项目中要用接口,消费者中要用接口,是是不是两个项目都TM要写同样的代码啊,那多麻烦!!
所以这里我们用一个项目把需要的公共代码丢进去,一些接口啊,实体啊啥的,然后打成jar包导入到生产者和消费者中,多完美。
API项目:
由于helloworld的demo过于简单,这里我们就丢一个公共接口放里面。
package com.provider; /** * ClassName:DemoService * Function: TODO ADD FUNCTION. * Date: 2017年11月28日 下午6:43:49 * @author HXY */ public interface DemoService { String sayHello(String name); }
然后pom文件只需要注明版本号信息啥的:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>hxy.superFather.forJava</groupId> <artifactId>dubbo-api</artifactId> <packaging>jar</packaging> <version>0.0.1-SNAPSHOT</version> <name>dubbo-api Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> <build> <finalName>dubbo-api</finalName> </build> </project>
provider项目:
接口实现类:
package com.provider.impl; import com.bean.User; import com.provider.DemoService; /** * ClassName:DemoServiceImpl * Function: TODO ADD FUNCTION. * Date: 2017年11月29日 上午9:31:23 * @author HXY */ public class DemoServiceImpl implements DemoService { @Override public String sayHello(String name) { return "Hello " + name; } }
服务注册启动类:
package com; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Provider { public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "provider.xml" }); context.start(); System.in.read(); // 为保证服务一直开着,利用输入流的阻塞来模拟 } }
spring整合dubbo配置文件provider.xml:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 提供方应用信息,用于计算依赖关系 --> <dubbo:application name="dubbo-provider-app" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <!-- 使用multicast广播注册中心暴露服务地址 --> <!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> --> <!-- 用dubbo协议在20880端口暴露服务 --> <dubbo:protocol name="dubbo" port="20880" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="zookeeper://127.0.0.1:2181?backup=127.0.0.1:2182,127.0.0.1:2183" /> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.provider.DemoService" ref="demoService" /> <!-- 和本地bean一样实现服务 --> <bean id="demoService" class="com.provider.impl.DemoServiceImpl" /> </beans>
pom配置文件:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>dubbo</groupId> <artifactId>dubbo-provider</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>dubbo-provider Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <!-- spring版本号 --> <spring.version>4.0.2.RELEASE</spring.version> <!-- mybatis版本号 --> <mybatis.version>3.2.6</mybatis.version> <!-- log4j日志文件管理包版本 --> <slf4j.version>1.7.7</slf4j.version> <log4j.version>1.2.17</log4j.version> <!-- shiro版本号 --> <shiro.version>1.2.3</shiro.version> </properties> <dependencies> <!-- 6 dubbo zookeeper相关依赖start --> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> <exclusions> <exclusion> <groupId>org.springframework</groupId> <artifactId>spring</artifactId> </exclusion> <exclusion> <groupId>org.jboss.netty</groupId> <artifactId>netty</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.6</version> </dependency> <dependency> <groupId>com.github.sgroschupf</groupId> <artifactId>zkclient</artifactId> <version>0.1</version> </dependency> <dependency> <groupId>hxy.superFather.forJava</groupId> <artifactId>dubbo-api</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <!-- junit配置 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- 导入java ee jar 包 --> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> </dependency> <!-- spring核心包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <!-- json数据 --> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.8.5</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.7.7</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.9</version> </dependency> <!-- JSTL标签类 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> </dependencies> <build> <finalName>dubbo-provider</finalName> </build> </project>
DubboConsummer项目:
消费类:
public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "spring-common.xml" }); context.start(); for(int i = 0;i<10;i++){ DemoService demoService = (DemoService) context.getBean("demoService"); String hello = demoService.sayHello("tom"); System.out.println("-------------"+hello); Thread.sleep(5000); } System.in.read(); System.out.println("end"); }
spring整合dubbo配置文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"> <import resource="classpath:spring-dubbo.xml"/> </beans> <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd "> <!-- 提供方应用信息,用于计算依赖关系 --> <dubbo:application name="counmser" /> <!-- 使用multicast广播注册中心暴露服务地址 --> <!--<dubbo:registry address="multicast://224.5.6.7:1234" /> --> <!-- 使用zookeeper注册中心暴露服务地址 即zookeeper的所在服务器ip地址和端口号 --> <dubbo:registry address="zookeeper://127.0.0.1:2181?backup=127.0.0.1:2182,127.0.0.1:2183" /> <!-- 生成远程服务代理,可以像使用本地bean一样使用demoService --> <dubbo:reference id="demoService" interface="com.provider.DemoService" /> </beans>
二、运行
在正常项目部署中,我们会打包成可执行的jar文件启动,就还需要配置pom才能让maven打包。
但是这个我们后续再讲,今天的demo我们就用eclipse的main方法执行了,原理其实一样的。
- 首先打开zookeeper工具
- 启动服务提供者,他会自动注册到配置文件配置的zookeeper中
- 启动消费者,调用服务
然后看到这样的打印,说明成功了,dubbo的基本使用原理在做helloworld项目过程中,也应该有了大致了解。
三、其他问题解决
- spring-dubbo整合的配置文件中,dubbo配置项红叉报错问题。
原因:
因为dubbo.xsd文件找不到吧,好像是这个原因!
解决方案:
- 到maven库中找到dubbo的jar包,将其解压。
- 找到解压文件夹下的META-INF文件夹下的dubbo.xsd。
- eclipse选择windows->preferrence->xml->xml Catalog,右侧add-xml文件,在文件目录中选择dubbo.xsd。
- 下面的key值填写配置文件中一致的 http://code.alibabatech.com/schema/dubbo/dubbo.xsd
如下图:
确定完成之后重新验证配置文件即可。
谢谢点击:http://www.droptb.com/article/detail/0eb59155f8b9434d99d8875a900ea750