Dubbo

Dubbo直连

1、创建项目结构

2、添加依赖

link_consumer pom.xml

<dependencies>
  <!-- Dubbo依赖 -->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.6.0</version>
  </dependency>

  <!-- Spring依赖 -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.10.RELEASE</version>
  </dependency>

  <!-- 接口 -->
  <dependency>
    <groupId>org.example</groupId>
    <artifactId>link_provider</artifactId>
    <version>1.0-SNAPSHOT</version>
  </dependency>
</dependencies>

link_provider pom.xml

<dependencies>
  <!-- Dubbo依赖 -->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.6.0</version>
  </dependency>

  <!-- Spring依赖 -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.10.RELEASE</version>
  </dependency>
</dependencies>

<build>
  <!-- 不添加打包的时候会报错 -->
  <defaultGoal>compile</defaultGoal>
</build>

3、添加配置文件

link_consumer

dubbo-link-consumer.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">

    <!-- 声明服务消费者名称，保证它的唯一性，它是dubbo内部使用的唯一标识 -->
    <dubbo:application name="link_consumer"/>

    <!--
        引用远程接口
        id 远程接口服务的代理对象名称
        interface 接口的全限定类名
        url 调用远程接口服务的url地址
        registry 直连方式，不使用注册中心，值：N/A
    -->
    <dubbo:reference id="someService"
                     interface="com.dyf.dubbo.service.SomeService"
                     url="dubbo://localhost:20880"
                     registry="N/A"/>
</beans>

spring-mvc.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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.dyf.dubbo.controller"/>

    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

web.xml

<?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">

    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:dubbo-link-consumer.xml,classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

link_provider

dubbo-link-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">

    <!-- 声明服务提供者名称，保证它的唯一性，它是dubbo内部使用的唯一标识 -->
    <dubbo:application name="link_provider"/>

    <!--
        指定dubbo的协议名称和端口号
        name 指定协议名称，官方推荐dubbo协议
        port 协议的端口号，默认为20880
    -->
    <dubbo:protocol name="dubbo" port="20880"/>

    <!--
        暴露服务
        interface 暴露服务的接口全限定类名
        ref 引用接口在spring容器中的标识名称
        registry 使用直连方式，不使用注册，值：N/A
    -->
    <dubbo:service interface="com.dyf.dubbo.service.SomeService"
                   ref="someService"
                   registry="N/A"/>
</beans>

spring-mvc.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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.dyf.dubbo.service"/>

    <mvc:annotation-driven/>

</beans>

web.xml

<?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">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:dubbo-link-provider.xml,classpath:spring-mvc.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

</web-app>

4、配置Tomcat服务器

5、测试

启动link_provider，然后启动link_consumer

6、结论

直连方式没有屏蔽底层实现细节

dubbo官方推荐使用的项目结构如下：

1、服务提供者工程（web工程）

实现接口工程中的业务接口

2、服务消费者工程（web工程）

消费服务提供者提供的业务接口

3、接口工程（java工程）

业务接口和实体类

Dubbo官方推荐使用的项目结构

1、创建项目结构

1、服务提供者工程（web工程）link_provider_01

实现接口工程中的业务接口

2、服务消费者工程（web工程）link_consumer_01

消费服务提供者提供的业务接口

3、接口工程（java工程）interface

业务接口和实体类

2、interface

User.java

package com.dyf.dubbo.model;

import java.io.Serializable;

/**
 * 此处需要实现Serializable接口，否则传输时会报错
 * @author: dyf
 * @date: 2022/9/3 10:13
 * @version: 1.0
 */
public class User implements Serializable {

    private Integer id;
    private Integer age;

    public User(Integer id, Integer age) {
        this.id = id;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", age=" + age +
                '}';
    }
}

UserService.java

package com.dyf.dubbo.service;

import com.dyf.dubbo.model.User;

/**
 * @author: dyf
 * @date: 2022/9/3 10:14
 * @version: 1.0
 */
public interface UserService {

    /**
     * hello
     * @param msg
     * @return
     */
    String hello(String msg);

    /**
     * 根据id获取用户
     * @param id
     * @return
     */
    User getUserById(Integer id);

}

3、link_provider_01

pom.xml

<dependencies>
  <!-- Dubbo依赖 -->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.6.0</version>
  </dependency>

  <!-- Spring依赖 -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.10.RELEASE</version>
  </dependency>

  <!-- 接口工程 -->
  <dependency>
    <groupId>org.example</groupId>
    <artifactId>interface</artifactId>
    <version>1.0-SNAPSHOT</version>
  </dependency>
</dependencies>

UserServiceImpl.java

package com.dyf.dubbo.service.impl;

import com.dyf.dubbo.model.User;
import com.dyf.dubbo.service.UserService;

/**
 * @author: dyf
 * @date: 2022/9/3 10:21
 * @version: 1.0
 */
public class UserServiceImpl implements UserService {
    @Override
    public String hello(String msg) {
        return "hello" + msg;
    }

    @Override
    public User getUserById(Integer id) {
        return new User(id,20);
    }
}

dubbo-link-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">

    <!-- 声明服务提供者名称，名称唯一 -->
    <dubbo:application name="link_provider_01"/>

    <!-- 指定协议和端口号，官方推荐为dubbo、20880 -->
    <dubbo:protocol name="dubbo" port="20880"/>

    <!-- 暴露服务接口 -->
    <dubbo:service interface="com.dyf.dubbo.service.UserService"
                   ref="userService"
                   registry="N/A"/>

    <bean name="userService" class="com.dyf.dubbo.service.impl.UserServiceImpl"/>
</beans>

web.xml

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:dubbo-link-provider.xml</param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

4、link_consumer_01

pom.xml

<dependencies>
  <!-- Dubbo依赖 -->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.6.0</version>
  </dependency>

  <!-- Spring依赖 -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.10.RELEASE</version>
  </dependency>

  <!-- 接口工程 -->
  <dependency>
    <groupId>org.example</groupId>
    <artifactId>interface</artifactId>
    <version>1.0-SNAPSHOT</version>
  </dependency>
</dependencies>

UserController.java

package com.dyf.dubbo.controller;

import com.dyf.dubbo.model.User;
import com.dyf.dubbo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author: dyf
 * @date: 2022/9/3 16:43
 * @version: 1.0
 */
@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/hello")
    public String hello(Model model) {
        String hello = userService.hello("world");
        model.addAttribute("hello",hello);
        return "hello";
    }

    @RequestMapping("/user/{id}")
    public String user(Model model,
                      @PathVariable("id") Integer id) {
        User user = userService.getUserById(id);
        model.addAttribute("user",user);
        return "user";
    }

}

dubbo-link-consumer.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">

    <!-- 服务消费者名称 -->
    <dubbo:application name="link_consumer_01"/>

    <!-- 引用远程接口 -->
    <dubbo:reference interface="com.dyf.dubbo.service.UserService"
                     id="userService"
                     url="dubbo://localhost:20880"
                     registry="N/A"/>

</beans>

spring-mvc.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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.dyf.dubbo.controller"/>

    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    
</beans>

web.xml

<servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:dubbo-link-consumer.xml,classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

hello.jsp

<%--
  User: dyf
  Date: 2022/9/3
  Time: 16:59
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    ${requestScope.hello}
</body>
</html>

user.jsp

<%--
  User: dyf
  Date: 2022/9/3
  Time: 16:58
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    ${requestScope.user.id} <br>
    ${requestScope.user.age}
</body>
</html>

5、测试

配置tomcat服务器如上直连，运行link_provider_01，然后运行link_consumer_01

localhost:8080/hello

localhost_8080/user/1

使用Zookeeper

1、创建项目结构

2、添加依赖

二者需要添加的依赖相同

<dependencies>
  <!-- dubbo依赖 -->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.6.2</version>
  </dependency>

  <!-- Spring依赖 -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.16.RELEASE</version>
  </dependency>

  <!-- zookeeper注册中心依赖 -->
  <dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-framework</artifactId>
    <version>5.3.0</version>
  </dependency>
</dependencies>

3、配置文件

zk-provider

dubbo-zk-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">

    <!-- 声明提供者名称 -->
    <dubbo:application name="zk-provider"/>

    <!-- 指定协议、端口号 -->
    <dubbo:protocol name="dubbo" port="20880"/>

    <!-- 指定注册中心 -->
    <dubbo:registry address="zookeeper://localhost:2181"/>

    <!-- 暴露服务 -->
    <dubbo:service interface="com.dyf.dubbo.service.UserService" ref="userService"/>

    <bean id="userService" class="com.dyf.dubbo.service.impl.UserServiceImpl"/>
</beans>

web.xml

<?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">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:dubbo-zk-provider.xml</param-value>
    </context-param>
    
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

</web-app>

zk-consumer

dubbo-zk-consumer.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">

    <!-- 声明消费者名称 -->
    <dubbo:application name="zk-consumer"/>

    <!-- 指定注册中心 -->
    <dubbo:registry address="zookeeper://localhost:2181"/>

    <!-- 引用远程服务接口 -->
    <dubbo:reference id="userService" interface="com.dyf.dubbo.service.UserService"/>

</beans>

spring-mvc.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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.dyf.dubbo.controller"/>

    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

web.xml

<?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">

    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:dubbo-zk-consumer.xml,classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

interface代码以及其他Java代码与之前的相同

4、测试

启动zookeeper

启动zk-provider

启动zk-consumer

Dubbo的配置

1、配置原则

在服务提供者配置访问参数。因为服务提供者更了解服务的各种参数

2、关闭检查

dubbo缺省会在启动时检查依赖的服务是否可用，不可用时会抛出异常，阻止Spring初始化完成，以便上线时能及早发现问题，默认check=true。通过“check=false”关闭检查。比如，测试时，有些服务不关心，或者出现了循环依赖，必须有一方先启动。

例1：关闭某个服务的启动时检查

<dubbo:reference interface="com.dyf.dubbo.service.UserService" check="false"/>

例2：关闭注册中心启动时检查

<dubbo:registry check="false">

默认启动服务时检查注册中心存在并已运行，注册中心不启动会报错

3、重试次数

消费者访问提供者，如果访问失败，则切换重试访问其它服务器，但重试会带来更长延迟。访问时间变长，用户的体验较差。多次重新访问服务器有可能访问成功。可通过retries="2"来设置重试次数(不含第一次)。

<dubbo:service retries="2"> 或 <dubbo:reference retries="2">

4、超时时间

由于网络或服务端不可靠，会导致调用出现一种不确定的中间状态(超时)。为了避免超时导致客户端资源(线程)挂起耗尽，必须设置超时时间。
timeout:调用远程服务超时时间(亳秒)

5、版本号

每个接口都应定义版本号，为后续不兼容升级提供可能。当一个接口有不同的实现，项目早期使用的一个实现类，之后创建接口的新的实现类。区分不同的接口实现使用version。

<!-- 引用远程服务接口 -->
<dubbo:reference id="userService" interface="com.dyf.dubbo.service.UserService" version="1.0"/>
<dubbo:reference id="newUserService" interface="com.dyf.dubbo.service.UserService" version="2.0"/>

<!-- 暴露服务 -->
<dubbo:service interface="com.dyf.dubbo.service.UserService" ref="userService" version="1.0"/>
<dubbo:service interface="com.dyf.dubbo.service.UserService" ref="newUserService" version="2.0"/>

监控中心

1、什么是监控中心

Dubbo的使用，其实只需要有注册中心，消费者，提供者这三个就可以使用了，但是并不能看到有哪些消费者和提供者，为了更好的调试，发现问题，解决问题，因此引入dubbo-admin。通过dubbo-admin 可以对消费者和提供者进行管理。可以在dubbo 应用部署做动态的调整，服务的管理。

dubbo- admin
图形化的服务管理页面;安装时需要指定注册中心地址，即可从注册中心中获取到所有的提供者/消费者进行配置管理

posted @ 2022-09-05 15:57 巡夜阅读(21) 评论(0) 收藏举报

刷新页面返回顶部

巡夜

Dubbo

Dubbo直连

1、创建项目结构

2、添加依赖

3、添加配置文件

link_consumer

dubbo-link-consumer.xml

spring-mvc.xml

web.xml

link_provider

dubbo-link-provider.xml

spring-mvc.xml

web.xml

4、配置Tomcat服务器

5、测试

6、结论

Dubbo官方推荐使用的项目结构

1、创建项目结构

2、interface

User.java

UserService.java

3、link_provider_01

pom.xml

UserServiceImpl.java

dubbo-link-provider.xml

web.xml

4、link_consumer_01

pom.xml

UserController.java

dubbo-link-consumer.xml

spring-mvc.xml

web.xml

hello.jsp

user.jsp

5、测试

使用Zookeeper

1、创建项目结构

2、添加依赖

3、配置文件

zk-provider

dubbo-zk-provider.xml

web.xml

zk-consumer

dubbo-zk-consumer.xml

spring-mvc.xml

web.xml

4、测试

Dubbo的配置

1、配置原则

2、关闭检查

3、重试次数

4、超时时间

5、版本号

监控中心

1、什么是监控中心

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