Dubbo+Spring MVC+ZooKeeper初识

匿名 (未验证) 提交于 2019-12-02 23:38:02

Zookeeper

介绍

ZooKeeper是一个分布式的,开放源码的分布式应用程序协调服务,是Google的Chubby一个开源的实现,是Hadoop和Hbase的重要组件。它是一个为分布式应用提供一致性服务的软件,提供的功能包括:配置维护、域名服务、分布式同步、组服务等。(来自于百度百科)

Win安装调试

下载地址:https://www.apache.org/dyn/closer.cgi/zookeeper/

运行的地址是bin/zkServer.cmd

在你执行启动脚本之前,还有几个基本的配置项需要配置一下,Zookeeper 的配置文件在 conf 目录下,这个目录下有 zoo_sample.cfg 和 log4j.properties,你需要做的就是将 zoo_sample.cfg 改名为 zoo.cfg,因为 Zookeeper 在启动时会找这个文件作为默认配置文件。下面详细介绍一下,这个配置文件中各个配置项的意义。

# The number of milliseconds of each tick tickTime=2000 # The number of ticks that the initial  # synchronization phase can take initLimit=10 # The number of ticks that can pass between  # sending a request and getting an acknowledgement syncLimit=5 # the directory where the snapshot is stored. # do not use /tmp for storage, /tmp here is just  # example sakes. dataDir=/tmp/zookeeper # the port at which the clients will connect clientPort=2181 # the maximum number of client connections. # increase this if you need to handle more clients #maxClientCnxns=60 # # Be sure to read the maintenance section of the  # administrator guide before turning on autopurge. # # http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance # # The number of snapshots to retain in dataDir #autopurge.snapRetainCount=3 # Purge task interval in hours # Set to "0" to disable auto purge feature #autopurge.purgeInterval=1 

配置详情:
tickTime=2000 ##ZK服务器与客户端之间的心跳间隔
initLimit=10 ##集群中使用,集群中可以忍耐的心跳间隔数
syncLimit=5 ##集群中使用,请求和应答之间最长等待
dataDir=/tmp/zookeeper ##保存数据的位置。默认log也在一起

调试界面

zkui的下载地址:https://codeload.github.com/DeemOpen/zkui/zip/master

界面:

Dubbo

dubbo的组成部分分为四个:consumer(消费者),register(注册中心,即zookeeper),provider(服务者),monitor(监控中心)
项目的类图:

├―api │  └―src │     └―main │        └―java │           └―com │               └―example │                   └―api │                       └―api │                          └―TestService  ├―carFactory │  └―src │     └―main │        └―java │           └―com │               └―example │                   └―factory │                       │―Impl │                       │  └―TestServiceImpl │                       └―carFactory └―carShop     └―src       └―main         └―java            └―com               └―example                     └―carShop 

Dubbo使用ZK

<dependency>     <groupId>org.apache.dubbo</groupId>     <artifactId>dubbo</artifactId>     <version>${dubbo.version}</version> </dependency> <dependency>     <groupId>org.apache.dubbo</groupId>     <artifactId>dubbo-dependencies-zookeeper</artifactId>     <version>${dubbo.version}</version> </dependency> 

服务端

简单api:

package com.example.api.api;  public interface TestService {     public String test(); } 

服务端的xml文件

//显示在界面的标识名字 <dubbo:application name="TestService" /> //注册ZooKeeper的地址 <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" /> //启动线上日志 <dubbo:protocol accesslog="true" name="dubbo" port="20880" /> //interface和name的对应,ref的testService没有关系,主要是在consumer中使用 <dubbo:service interface="com.example.api.api.TestService" ref="testService"/> //注册到bean的,可以有两种方式1)注解。类似于@Service 2)xml文件 <!--<bean id="testService" class="com.example.factory.Impl.TestServiceImpl"/>--> //扫描的地址 <context:component-scan base-package="com.example.factory" /> 

Note:注册到bean的方法,可以有两种方式1)注解。类似于@Service 2)xml文件

服务端提供:

public class TestServiceImpl implements TestService {     public String test() {         return "This a TestServiceImpl";     } } 

启动服务:

public class carFactory {     public static void main(String[] args){ 	//读取相关配置文件         ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                 "classpath*:applicationContext.xml");         context.start();         try { 		//卡死进程             System.in.read();         } catch (IOException e) {             e.printStackTrace();         }     } } 

消费端

配置信息:

//显示在界面的标识名字 <dubbo:application name="TestService-consumer" /> <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" /> <dubbo:protocol accesslog="true" name="dubbo" port="20880" /> //消费的地址 <dubbo:reference id="testService" interface="com.example.api.api.TestService"/> 

启动服务:

public class carShopApp {     public static void  main(String[] args){         ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");         context.start();         TestService demoService = (TestService)context.getBean("testService");         System.out.println(demoService.test());     } } 

Spring MVC + ZooKeeper

服务端

服务实现:

import com.example.api.api.TestService; import org.springframework.stereotype.Service;  @Service public class TestServiceImpl implements TestService {     public String test() {         return "webapp:SpringMVC";     } } 

Spring MVC 的XML配置:

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"          version="4.0">     <display-name>springmvcdemo</display-name>     <listener>         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>     </listener>     <!--指定使用maven的resource为目标地址 -->     <!--<context-param>-->         <!--<param-name>contextConfigLocation</param-name>-->         <!--<param-value>classpath:applicationContext.xml</param-value>-->     <!--</context-param>-->     <servlet>         <servlet-name>provider</servlet-name>         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>         <init-param>             <param-name>contextConfigLocation</param-name>             <param-value>                 WEB-INF/applicationContext.xml,WEB-INF/applicationContext-servlet.xml             </param-value>         </init-param>         <load-on-startup>1</load-on-startup>     </servlet>     <servlet-mapping>         <servlet-name>provider</servlet-name>         <url-pattern>*.do</url-pattern>         <!--指定匹配Url -->     </servlet-mapping>      <!-- 字符过滤器 -->     <filter>         <filter-name>Set Character Encoding</filter-name>         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>         <init-param>             <param-name>encoding</param-name>             <param-value>UTF-8</param-value>         </init-param>     </filter>     <filter-mapping>         <filter-name>Set Character Encoding</filter-name>         <url-pattern>/*</url-pattern>     </filter-mapping> </web-app> 

关于这个的改造,可以查看博客关于“Could not open ServletContext resource [/WEB-INF/applicationContext.xml]”解决方案

其他一些文件没啥太大作用

客户端

从注册中心中获取,然后去消费

@RestController @RequestMapping public class TestController {     @Autowired     private TestService testService;      @GetMapping("/test.do")     public String test(){         return testService.test();     }      @GetMapping({"/test123.do"})     public String test123() {         return "test123";     } } 

其余的都和之前的差不多

测试代码地址:https://gitee.com/eason93/DubboFirstDemo

文章来源: https://blog.csdn.net/zrqsyh/article/details/90768324
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