Dubbo demo
2019-07-11 本文已影响0人
鸡龙
前
先来了解一下何为dubbo，与zookeeper有什么关系。
一、环境搭建
Window、idea2019.1.1、JDK8、zookeeper-3.5.0-alpha、dubbo2.5.4
Dubbo+Zookeeper 的下载地址
1、zookeeper-3.5.0-alpha
2、dubbo-admin.2.5.4
代码github地址
1、Zookeeper
zookeeper文件夹结构。配置文件在conf下，运行文件在bin下。
zookeeper
解压后对conf下的zoo_sample.cfg文件进行复制副本备份，再将其文件名更改为zoo.cfg后，进入修改配置
开放服务端口8081
保存配置后，进入bin，双击zkServer.cmd即可运行zookeeper。
由于某些原因可以导致报错导致出现闪退情况，在zkServer.cmd的末尾加上pause，可以在运行的时候查看异常栈
pause添加处
看到这行就代表启动成功了
启动成功
2、Dubbo
下载好dubbo后解压到tomcat的webapps下，将文件夹名字更改为ROOT，将ROOT默认文件替换。这样可以直接访问127.0.0.1:8080直接访问dubbo Admin。（当然也可以不设置为默认访问）。随后即可以访问http://127.0.0.1:8080输入root,root登录dubbo admin。
dubbo界面
注：第一第二步缺一不可。
3、搭建时遇到的迷之错误
启动Zookeeper时遇到：Hadoop Error: JAVA_HOME is incorrectly set问题。
因为路径中包含空格会导致报错，将环境变量中的JAVA_HOME有空格的路径用双引号括住即可以解决。
JAVA_HOME
二、创建项目
1、工程目录
Dubbo-parent为总工程，dubbo-provider，dubbo-consumer，dubbo-api都是子模块，dubbo-provider，dubbo-consumer又依赖于dubbo-api模块。一个工程三个模块。
依赖图
工程目录
2、创建Dubbo空工程
3、在空工程下创建dubbo-parent总模块
选择simple
完成创建
完成创建后，配置他的pom.xml，如果你的dubbo或zookeeper版本和本文连接中的不一样，需要在pom中自己修改。
maven pom.xml文件标签
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.dubbo.parent</groupId>
<artifactId>dubbo-parent</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>../dubbo-provider</module>
<module>../dubbo-consumer</module>
<module>../dubbo-api</module>
</modules>
<packaging>pom</packaging>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<!-- spring版本号 -->
<spring.version>4.2.5.RELEASE</spring.version>
<!-- mybatis版本号 -->
<mybatis.version>3.2.8</mybatis.version>
<!-- mysql驱动版本号 -->
<mysql-driver.version>5.1.29</mysql-driver.version>
<!-- log4j日志包版本号 -->
<slf4j.version>1.7.18</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- 添加jstl依赖 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<!-- 添加junit4依赖 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!-- 指定范围，在测试时才会加载 -->
<scope>test</scope>
</dependency>
<!-- 添加spring核心依赖 -->
<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-context</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-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- 添加mybatis依赖 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- 添加mybatis/spring整合包依赖 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<!-- 添加mysql驱动依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql-driver.version}</version>
</dependency>
<!-- 添加数据库连接池依赖 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!-- 添加fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.22</version>
</dependency>
<!-- 添加日志相关jar包 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- log end -->
<!-- 映入JSON -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-core</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-web</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-ehcache</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.5.0-alpha</version>
</dependency>
<!-- dubbo -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.4</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.10</version>
</dependency>
<dependency>
<groupId>com.dubbo.api</groupId>
<artifactId>dubbo-api</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
<distributionManagement>
<site>
<id>website</id>
<url>scp://webhost.company.com/www/website</url>
</site>
</distributionManagement>
<build>
<finalName>dubbo-parent</finalName>
</build>
</project>
4、构建dubbo-api，dubbo-provider，dubbo-consumer模块
三个模块的创建方式都差不多，下面只放出三个模块的pom
provider pom配置
<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/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>dubbo-parent</artifactId>
<groupId>com.dubbo.parent</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../dubbo-parent/pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.dubbo.parent</groupId>
<artifactId>dubbo-provider</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>dubbo-provider</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.dubbo.api</groupId>
<artifactId>dubbo-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>dubbo-provider</finalName>
</build>
</project>
api pom
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.dubbo.api</groupId>
<artifactId>dubbo-api</artifactId>
<version>1.0-SNAPSHOT</version>
<name>dubbo-api</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
consumer pom
<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/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>dubbo-parent</artifactId>
<groupId>com.dubbo.parent</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../dubbo-parent/pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.dubbo.consumer</groupId>
<artifactId>dubbo-consumer</artifactId>
<packaging>war</packaging>
<name>dubbo-consumer</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.dubbo.api</groupId>
<artifactId>dubbo-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>dubbo-consumer</finalName>
</build>
</project>
5、编写接口
这里示例有两个接口
1）在api中需要定义的接口类
Userservice接口
package com.dubbo.api;
import java.util.List;
import java.util.Map;
public interface UserService {
Map<String,Object> getUserInfo(int id);
List getUserInfo(String str);
}
LoginService接口
package com.dubbo.api;
public interface LoginService {
public String Login(String name,String password);
}
2）在provider中需要实现接口
UserServiceImpl类实现api中的UserService接口
package com.dubbo.provider;
import com.dubbo.api.UserService;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class UserServiceImpl implements UserService {
@Override
public Map<String, Object> getUserInfo(int id) {
Map<String, Object> map = new HashMap<>();
map.put("name","张三");
map.put("sex","男");
map.put("id",id);
return map;
}
@Override
public List<String> getUserInfo(String str){
List<String> list = new ArrayList<>();
list.add(str);
list.add("男");
return list;
}
}
LoginServiceImpl中实现api中的LoginService接口
package com.dubbo.provider;
import com.dubbo.api.LoginService;
public class LoginServiceImpl implements LoginService {
@Override
public String Login(String name, String password) {
if(name.equals("张三")&&password.equals("zhangsan")){
return "正确";
}
return "错误";
}
}
provider中应该要设置resoures，具体设置方式：
右键模块-->Open model settings
设置resoures文件夹
然后在设置的文件夹中创建provider.xml
provider.xml
provider中需要设置使用zookeeper暴露服务、dubbo协议暴露服务和定义接口的位置和实现接口的位置，provider.xml的内容。
<?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">
<!--定义了提供方应用信息，用于计算依赖关系；在 dubbo-admin 或 dubbo-monitor 会显示这个名字，方便辨识-->
<dubbo:application name="demotest-provider" owner="programmer" organization="dubbox"/>
<!--使用 zookeeper 注册中心暴露服务，注意要先开启 zookeeper-->
<dubbo:registry address="zookeeper://localhost:2181"/>
<!-- 用dubbo协议在20880端口暴露服务 -->
<dubbo:protocol name="dubbo" port="20880" />
<!--使用 dubbo 协议实现定义好的 api.PermissionService 接口-->
<dubbo:service interface="com.dubbo.api.UserService" ref="userService" protocol="dubbo" />
<dubbo:service interface="com.dubbo.api.LoginService" ref="LoginService" protocol="dubbo"/>
<!--具体实现该接口的 bean-->
<bean id="userService" class="com.dubbo.provider.UserServiceImpl"/>
<bean id="LoginService" class="com.dubbo.provider.LoginServiceImpl"/>
</beans>
设置好xml和实现了接口后，需要一个入口Main来打开服务
package com.dubbo.provider;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
/**
* Hello world!
*
*/
public class Provider {
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext context =
new ClassPathXmlApplicationContext("provider.xml");
System.out.println(context.getDisplayName() + ": here");
context.start();
System.out.println("服务已经启动...");
System.in.read();
}
}
配置完成后运行是可以正常启动的，并在dubbo admin中有该服务的信息
服务详情
3）在consumer中使用服务
因为要使用到服务中的接口，所以我们要先定义consumer.xml，和创建provider时一样，要先规定一个resoures，构建后如下图
consumer.xml内容
<?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">
<dubbo:application name="demotest-consumer" owner="programmer" organization="dubbox"/>
<!--向 zookeeper 订阅 provider 的地址，由 zookeeper 定时推送-->
<dubbo:registry address="zookeeper://localhost:2181"/>
<!--使用 dubbo 协议调用定义好的 api.PermissionService 接口-->
<dubbo:reference id="permissionService" interface="com.dubbo.api.UserService"/>
<dubbo:reference id="permissionService1" interface="com.dubbo.api.LoginService"/>
</beans>
Consumer类调用接口测试
package com.dubbo.consumer;
import com.dubbo.api.UserService;
import com.dubbo.api.LoginService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Consumer {
public static void main(String [] args){
ClassPathXmlApplicationContext context =
new ClassPathXmlApplicationContext("consumer.xml");
context.start();
System.out.println("consumer start");
UserService userService = context.getBean(UserService.class);
LoginService loginService = context.getBean(LoginService.class);
System.out.println("consumer");
System.out.println(userService.getUserInfo(1));
System.out.println(userService.getUserInfo("张三"));
System.out.println(loginService.Login("张三","zhangsan"));
}
}
调用成功
对比之前无消费者，消费者正常显示
消费者正常
文章参考：
1、IntelliJ IDEA+Maven简单搭建dubbo框架
2、Dubbo与Zookeeper、SpringMVC整合和使用(入门级)
3、【MAVEN】maven系列--pom.xml标签详解
4、Maven项目创建后没有resource文件夹
