dubbo学习笔记 第四章构建dubbo的web应用 上

时间  2019-11-07
标签 dubbo 学习 笔记 第四 构建 web 应用 栏目 Dubbo 繁體版
原文   原文链接

上一章节介绍了dubbo的开源项目自带的例子，可是这些例子都是直接运行main方法来跑代码，实际应用中咱们更多地是须要使用web应用来支撑，接下来介绍一下如何搭建dubbo的web应用，咱们将用的spring mvc来搭建。html

1、服务提供者java

在eclipse上搭建一个maven的web工程，具体如何搭建，这里不作详细介绍，个人工程名称叫作dubbo-ws-server，在这个工程中，pom.xml配置的内容以下：web

<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>com.ws</groupId>
  <artifactId>dubbo-web-client</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>dubbo-web-client Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
   <!-- 单元测试用的包，仅测试时使用，不发布（scope为test） -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>4.2.5.RELEASE</version>
			<scope>test</scope>
		</dependency>
        <dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-core</artifactId>
			<version>2.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-slf4j-impl</artifactId>
			<version>2.1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.2.5.RELEASE</version>
		</dependency>
		<!-- 加密相关包 -->
		<dependency>
			<groupId>commons-codec</groupId>
			<artifactId>commons-codec</artifactId>
			<version>1.10</version>
		</dependency>
		<!-- json转换须要的包 -->
		<dependency>
			<groupId>com.fasterxml.jackson.jaxrs</groupId>
			<artifactId>jackson-jaxrs-base</artifactId>
			<version>2.6.1</version>
		</dependency>

		<!-- 单元测试用的包，仅测试时使用，不发布（scope为test） -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		
		<!-- jsp包，不适用jsp时可删除此依赖，由容器提供，不发布 （scope为provided） -->
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.2</version>
			<scope>provided</scope>
		</dependency>
		<!-- servlet包，不适用jsp和servlet时可删除此依赖，由容器提供，不发布 （scope为provided） -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.0.1</version>
			<scope>provided</scope>
			<exclusions>
				<exclusion>
					<groupId>org.apache.geronimo.specs</groupId>
					<artifactId>geronimo-servlet_2.5_spec</artifactId>
				</exclusion>
			</exclusions>
		</dependency>

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>3.4</version>
		</dependency>

		<!-- Oracle-jdbc驱动 -->
		<dependency>
			<groupId>com.oracle</groupId>
			<artifactId>ojdbc14</artifactId>
			<version>10.2.0.4.0</version>
		</dependency>
		<!-- Hibernate5 -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>5.0.0.Final</version>
		</dependency>
		<!-- spring持久层 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>4.2.5.RELEASE</version>
		</dependency>
		<!-- 阿里巴巴的数据库链接池 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.18</version>
		</dependency>
		<!-- 事务控制相关 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>4.2.5.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.6</version>
		</dependency>

		<!-- spring-redis -->
		<dependency>
			<groupId>org.springframework.data</groupId>
			<artifactId>spring-data-redis</artifactId>
			<version>1.7.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
			<version>2.8.1</version>
		</dependency>
		<!-- spring-session -->
		<dependency>
			<groupId>org.springframework.session</groupId>
			<artifactId>spring-session</artifactId>
			<version>1.2.1.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-pool2</artifactId>
			<version>2.2</version>
		</dependency>

		<dependency>
			<groupId>commons-beanutils</groupId>
			<artifactId>commons-beanutils</artifactId>
			<version>1.9.2</version>
		</dependency>

	   <dependency>
		<groupId>commons-httpclient</groupId>
		<artifactId>commons-httpclient</artifactId>
		<version>3.1</version>
	  </dependency>

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-io</artifactId>
			<version>1.3.2</version>
		</dependency>
	<dependency>
			<groupId>jdom</groupId>
			<artifactId>jdom</artifactId>
			<version>1.1</version>
		</dependency>

		<!-- dubbo包 -->
		<dependency>
			<groupId>io.netty</groupId>
			<artifactId>netty</artifactId>
			<version>3.7.0.Final</version>
		</dependency>
		<dependency>
			<groupId>org.apache.zookeeper</groupId>
			<artifactId>zookeeper</artifactId>
			<version>3.4.6</version>
			<exclusions>
				<exclusion>
					<artifactId>log4j</artifactId>
					<groupId>log4j</groupId>
				</exclusion>
				<exclusion>
					<artifactId>slf4j-log4j12</artifactId>
					<groupId>org.slf4j</groupId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.apache.curator</groupId>
			<artifactId>curator-framework</artifactId>
			<version>2.5.0</version>
		</dependency>
		<dependency>
			<groupId>com.google.guava</groupId>
			<artifactId>guava</artifactId>
			<version>16.0.1</version>
			<scope>compile</scope>
		</dependency>
		<dependency>
			<groupId>com.esotericsoftware.kryo</groupId>
			<artifactId>kryo</artifactId>
			<version>2.24.0</version>
		</dependency>
		<dependency>
			<groupId>de.javakaffee</groupId>
			<artifactId>kryo-serializers</artifactId>
			<version>0.26</version>
		</dependency>
			<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.5.6</version>
			<exclusions>   
                <exclusion>  
                    <artifactId>spring</artifactId>  
                    <groupId>org.springframework</groupId>  
                </exclusion>  
            </exclusions>  
		</dependency>
	 <dependency>
            <groupId>com.ws</groupId>
            <artifactId>dubbo-ws-facade</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
  </dependencies>
  <build>
    <finalName>dubbo-web-client</finalName>
  </build>
</project>

其中dubbo的配置应用:redis

</dependency>
			<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.5.6</version>
			<exclusions>   
                <exclusion>  
                    <artifactId>spring</artifactId>  
                    <groupId>org.springframework</groupId>  
                </exclusion>  
            </exclusions>  
		</dependency>
	 <dependency>

要把spring相关引用去除掉，由于dubbo 2.5.6这个版本好像用的是spring 2.5相关的包，咱们上面有引入spring相关的包，这样一来可能会冲突。spring

这里说明一下：如下服务端的代码是复制了网上的例子，可是例子十分简单，应该也不知道有什么抄袭之嫌:)数据库

这里暴露的服务代码是放在另一个工程里，pom.xml相对应的代码以下：apache

<dependency>
            <groupId>com.ws</groupId>
            <artifactId>dubbo-ws-facade</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

实现的接口类代码，以下：json

package com.ws.facade;

import com.ws.entity.User;

/**
 * Description: com.ws.facade
 * Author dobby | dennisit@163.com
 * Date 2015/5/30 23:50
 * Copyright Corporation 2015.05
 * Version 1.0
 */
public interface UserFacade {

    public int insert(User user);

    public int delete(int id);

    public User select(int id);

}

这个接口工程代码等下一样要引用到。api

1.实现提供者的代码有两个一个是User实体类的Java Bean，其代码以下：spring-mvc

package com.ws.entity;

import java.io.Serializable;

/**
 * Description: com.ws.entity
 * Author dobby | dennisit@163.com
 * Date 2015/5/30 23:50
 * Copyright Corporation 2015.05
 * Version 1.0
 */
public class User implements Serializable{

    private long id;
    private String name;

    public long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

值得注意的是相似这种的java要实现Serializable来序列化，不然在dubbo调用中可能会出现问题。

2.实现提供者服务的要暴露出来的接口实现代码：

package com.ws.server;

import com.ws.entity.User;
import com.ws.facade.UserFacade;

/**
 * Description: com.ws.server
 * Author dobby | dennisit@163.com
 * Date 2015/5/30 23:50
 * Copyright Corporation 2015.05
 * Version 1.0
 */
public class UserFacadeImpl implements UserFacade{

    public int insert(User user) {

        return 1;
    }

    public int delete(int id) {
        return 1;
    }

    public User select(int id) {
        User user = new User();
        user.setName("zhangssan");
        return user;
    }
}

既然用到sping web，还要把提供者相应的dubbo-provider.xml配置在spring-context.xml中，具体配置文件以下：

xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">


	<!-- <context:annotation-config /> -->


<context:property-placeholder location="classpath:jdbc.properties,classpath:service.properties" />

	<!-- proxy-target-class默认"false",更改成"ture"使用CGLib动态代理 -->
	

	<import resource="dubbo-provider.xml" />
	
<!-- 	<import resource="spring-db.xml" />
	<import resource="spring-datasource.xml" /> -->



</beans>

dubbo-provider.xml的内容以下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.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" />
	<!-- 使用zookeeper注册中心暴露服务地址 -->
	<dubbo:registry protocol="zookeeper" address="${dubbo.registry.address}" file="${catalina.home}/dubbo-registry/dubbo-gw-service-user.properties"/>

	<!-- 用dubbo协议在20881端口暴露服务 -->
	<dubbo:protocol name="dubbo" port="20881" />

    <bean id="userFacade" class="com.ws.server.UserFacadeImpl" />
	<!-- 用户服务接口 -->
	<dubbo:service interface="com.ws.facade.UserFacade" ref="userFacade" />

</beans>

其中file属性咱们是自定义了dubbo服务缓存目录，等程序运行起来，能够本身观察到相应路径下会生成缓存文件。

整体相应的文档目录截图以下：

最后为了web启动是加载spring 相应的配置，咱们要在web.xml中配置相应的属性，具体内容以下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         id="gw-service-merchant" version="2.5">

    <display-name>dubbo-ws-server</display-name>


    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-context.xml</param-value>
    </context-param>
</web-app>

这样基本就完成一个简易服务提供者的搭建。

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