商城项目实战11：引用dubbo服务

上文我们一起学习了如何发布一个dubbo服务，本文我就来教大家如何在web工程中引用dubbo发布的服务。 
首先我们在web工程也需要添加dubbo的依赖，我们可以直接把taotao-manager-service工程下的关于dubbo的依赖部分拷贝过来，拷贝的内容如下：

<!-- dubbo相关 --><dependency>    <groupId>com.alibaba</groupId>    <artifactId>dubbo</artifactId>    <!-- 排除依赖 -->    <exclusions>        <exclusion>            <groupId>org.springframework</groupId>            <artifactId>spring</artifactId>        </exclusion>        <exclusion>            <groupId>org.jboss.netty</groupId>            <artifactId>netty</artifactId>        </exclusion>    </exclusions></dependency><!-- zookeeper的客户端，你要连接zookeeper，需要把以下两个jar包加进来 --><dependency>    <groupId>org.apache.zookeeper</groupId>    <artifactId>zookeeper</artifactId></dependency><dependency>    <groupId>com.github.sgroschupf</groupId>    <artifactId>zkclient</artifactId></dependency>
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拷贝后的taotao-manager-web工程的pom.xml文件的内容如下：

<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>    <parent>        <groupId>com.taotao</groupId>        <artifactId>taotao-parent</artifactId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <groupId>com.taotao</groupId>    <artifactId>taotao-manager-web</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>war</packaging>    <dependencies>        <!-- Spring -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aspects</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jms</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context-support</artifactId>        </dependency>        <!-- JSP相关 -->        <dependency>            <groupId>jstl</groupId>            <artifactId>jstl</artifactId>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>servlet-api</artifactId>            <scope>provided</scope>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>jsp-api</artifactId>            <scope>provided</scope>        </dependency>        <!-- dubbo相关 -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>dubbo</artifactId>            <!-- 排除依赖 -->            <exclusions>                <exclusion>                    <groupId>org.springframework</groupId>                    <artifactId>spring</artifactId>                </exclusion>                <exclusion>                    <groupId>org.jboss.netty</groupId>                    <artifactId>netty</artifactId>                </exclusion>            </exclusions>        </dependency>        <!-- zookeeper的客户端，你要连接zookeeper，需要把以下两个jar包加进来 -->        <dependency>            <groupId>org.apache.zookeeper</groupId>            <artifactId>zookeeper</artifactId>        </dependency>        <dependency>            <groupId>com.github.sgroschupf</groupId>            <artifactId>zkclient</artifactId>        </dependency>    </dependencies>    <!-- 配置tomcat插件 -->    <build>        <plugins>            <plugin>                <groupId>org.apache.tomcat.maven</groupId>                <artifactId>tomcat7-maven-plugin</artifactId>                <configuration>                    <port>8080</port>                    <path>/</path>                </configuration>            </plugin>        </plugins>    </build></project>
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下面我们需要在taotao-manager-web工程下的springmvc.xml文件中引用dubbo服务，添加的内容如下。

<!-- 引用dubbo服务 --><dubbo:application name="taotao-manager-web"/><dubbo:registry protocol="zookeeper" address="192.168.25.167:2181"/>    <dubbo:reference interface="com.taotao.service.ItemService" id="itemService" />
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其中<dubbo:application name="taotao-manager-web"/>是要在注册中心申报一下名字，名字不能冲突。<dubbo:registry protocol="zookeeper" address="192.168.25.167:2181"/>同服务端一样，在注册中心注册下dubbo服务所在的IP及端口。<dubbo:reference interface="com.taotao.service.ItemService" id="itemService" />便是要引用服务端的接口了。 
引用dubbo服务之后springmvc.xml文件的完整内容如下：

<?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:p="http://www.springframework.org/schema/p"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"     xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">    <context:component-scan base-package="com.taotao.controller" />    <mvc:annotation-driven />    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="/WEB-INF/jsp/" />        <property name="suffix" value=".jsp" />    </bean>    <!-- 引用dubbo服务 -->    <dubbo:application name="taotao-manager-web"/>    <dubbo:registry protocol="zookeeper" address="192.168.25.167:2181"/>        <dubbo:reference interface="com.taotao.service.ItemService" id="itemService" /></beans>
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由于taotao-manager-web工程与taotao-mananger-interface是独立的两个工程，因此要在taotao-manager-web工程中要添加对taotao-manager-interface的依赖，添加的内容如下：

<dependency>      <groupId>com.taotao</groupId>      <artifactId>taotao-manager-interface</artifactId>      <version>0.0.1-SNAPSHOT</version>  </dependency>  
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添加后当前taotao-manager-web工程的pom.xml文件全部内容如下：

<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>    <parent>        <groupId>com.taotao</groupId>        <artifactId>taotao-parent</artifactId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <groupId>com.taotao</groupId>    <artifactId>taotao-manager-web</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>war</packaging>    <dependencies>        <!-- 依赖taotao-common -->        <dependency>              <groupId>com.taotao</groupId>              <artifactId>taotao-common</artifactId>              <version>0.0.1-SNAPSHOT</version>          </dependency>        <!-- 依赖taotao-manager-interface -->        <dependency>              <groupId>com.taotao</groupId>              <artifactId>taotao-manager-interface</artifactId>              <version>0.0.1-SNAPSHOT</version>          </dependency>        <!-- Spring -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aspects</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jms</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context-support</artifactId>        </dependency>        <!-- JSP相关 -->        <dependency>            <groupId>jstl</groupId>            <artifactId>jstl</artifactId>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>servlet-api</artifactId>            <scope>provided</scope>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>jsp-api</artifactId>            <scope>provided</scope>        </dependency>        <!-- dubbo相关 -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>dubbo</artifactId>            <!-- 排除依赖 -->            <exclusions>                <exclusion>                    <groupId>org.springframework</groupId>                    <artifactId>spring</artifactId>                </exclusion>                <exclusion>                    <groupId>org.jboss.netty</groupId>                    <artifactId>netty</artifactId>                </exclusion>            </exclusions>        </dependency>        <!-- zookeeper的客户端，你要连接zookeeper，需要把以下两个jar包加进来 -->        <dependency>            <groupId>org.apache.zookeeper</groupId>            <artifactId>zookeeper</artifactId>        </dependency>        <dependency>            <groupId>com.github.sgroschupf</groupId>            <artifactId>zkclient</artifactId>        </dependency>    </dependencies>    <!-- 配置tomcat插件 -->    <build>        <plugins>            <plugin>                <groupId>org.apache.tomcat.maven</groupId>                <artifactId>tomcat7-maven-plugin</artifactId>                <configuration>                    <port>8080</port>                    <path>/</path>                </configuration>            </plugin>        </plugins>    </build></project>
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maven更新完之后，我们可以在taotao-manager-web工程所依赖的包中找到taotao-manager-interface，如下图所示。 
 
添加完对taotao-manager-interface的依赖后，我们便可以直接使用它了。 

这里，如果我们使用@ResponseBody注解后访问的时候报406错误（无法把对象转换为json串），90%是可能没有引入jackson包，我们到”Maven Dependencies”下查看是否有如下图所示的三个jar包。 
 
如果没有，那么我们需要在taotao-manager-web工程中要添加对taotao-common的依赖，由于它依赖了jackson包，因此我们不用做任何处理。