學習淘淘商城第十三課（引用dubbo服務）
阿新 • • 發佈：2019-01-27
上節課我們一起學習瞭如何釋出一個dubbo服務，這節我們一起學習下web工程如何引用dubbo釋出的服務。
首先我們在web工程也需要新增dubbo的依賴，由於我們在taotao-manager-service工程已經添加了dubbo的依賴並且解決了包衝突的問題，那麼我們便可以直接把taotao-manager-service工程下的關於dubbo的依賴部分拷貝過來，拷貝的內容如下：
拷貝後的taotao-manager-web工程的pom.xml檔案的內容如下：<!-- dubbo相關的jar包 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <exclusions> <exclusion> <artifactId>spring</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>netty</artifactId> <groupId>org.jboss.netty</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> </dependency> <dependency> <groupId>com.github.sgroschupf</groupId> <artifactId>zkclient</artifactId> </dependency>
下面我們需要在taotao-manager-web工程下的springmvc.xml檔案中引用dubbo服務，新增的內容如下。其中<dubbo:application name="taotao-manager-web"/>是要在註冊中心申報一下名字，名字不能衝突。<dubbo:registry protocol="zookeeper" address="192.168.25.167:2181"/>同服務端一樣，在註冊中心註冊下dubbo服務所在的IP及埠。<dubbo:reference interface="com.taotao.service.ItemService" id="itemService" />便是要引用服務端的介面了。<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> <!-- 依賴taotao-common --> <dependency> <groupId>com.taotao</groupId> <artifactId>taotao-common</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相關 --> <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相關的jar包 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <exclusions> <exclusion> <artifactId>spring</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>netty</artifactId> <groupId>org.jboss.netty</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> </dependency> <dependency> <groupId>com.github.sgroschupf</groupId> <artifactId>zkclient</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <configuration> <path>/</path> <port>8081</port> </configuration> </plugin> </plugins> </build> </project>
<!-- 引用dubbo服務 --> <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" />
引用dubbo服務之後springmvc的完整內容如下：
<?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">
<!-- 配置註解驅動 -->
<mvc:annotation-driven />
<!-- 檢視解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置包掃描器，掃描@Controller註解的類 -->
<context:component-scan base-package="com.taotao.controller"/>
<!-- 引用dubbo服務 -->
<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>由於taotao-manager-web工程與taotao-mananger-interface是獨立的兩個工程，因此要在taotao-manager-web工程中要新增對taotao-manager-interface的依賴，新增的內容如下：
<dependency>
<groupId>com.taotao</groupId>
<artifactId>taotao-manager-interface</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency><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>
<!-- 依賴taotao-common -->
<dependency>
<groupId>com.taotao</groupId>
<artifactId>taotao-common</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<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相關 -->
<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相關的jar包 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<exclusions>
<exclusion>
<artifactId>spring</artifactId>
<groupId>org.springframework</groupId>
</exclusion>
<exclusion>
<artifactId>netty</artifactId>
<groupId>org.jboss.netty</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<path>/</path>
<port>8081</port>
</configuration>
</plugin>
</plugins>
</build>
</project>
新增完對taotao-manager-interface的依賴後，我們便可以直接使用它了。
如果我們使用@ResponseBody註解後訪問的時候報406錯誤（無法把物件轉換為json串），90%是可能沒有引入jackson包，我們到"Maven Dependencies"下檢視是否有如下圖所示的三個包。
如果沒有，那麼我們需要在taotao-common工程的pom.xml檔案中引入jackson的依賴，由於我們的taotao-mananger-web工程依賴了taotao-common，因此它會自動依賴jackson包。現在我們的taotao-common中是依賴了jackson的，因此我們不用做任何處理。
<!-- Jackson Json處理工具包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>