Dubbo在SSM項目中的使用
案例源代碼下載下傳位址
https://download.csdn.net/download/pcbhyy/10764704
操作步驟
- 建立一個ssm內建的項目,及編寫初始代碼
- 把該項目拆分為兩部分(表示層一部分、業務邏輯和資料通路層一部分)
- 通過dubbo在表示層中通路業務邏輯層中的元件(關鍵)
Dubbo簡介
Dubbo是阿裡巴巴公司開源的一個高性能優秀的服務架構,使得應用可通過高性能的 RPC 實作
服務的輸出和輸入功能,可以和Spring架構無縫內建。
-
Provider
暴露服務方稱之為“服務提供者”。
-
Consumer
調用遠端服務方稱之為“服務消費者”。
-
Registry
服務注冊與發現的中心目錄服務稱之為“服務注冊中心”。
-
Monitor
統計服務的調用次數和調用時間的日志服務稱之為“服務監控中心”。
一、項目拆分
-
拆分内容:
web.xml
pom.xml
springmvc.xml
applicationContext.xml
部配置設定置檔案的删除
代碼的删減
-
表示層項目
1)pom.xml(注意:添加了dubbo、zookeeper的依賴)
<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>
<groupId>com.yy</groupId>
<artifactId>ssm_dept2_vc</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<plugins>
<!-- 資源檔案拷貝插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.7</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<!-- java編譯插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<!-- 部署路徑,如:/e3mall,表明部署到/e3mall路徑下 -->
<path>/</path>
<!-- 端口号 -->
<port>8090</port>
<uriEncoding>utf-8</uriEncoding>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.10</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<!--解決Spring使用slf4j輸出日志與log4j沖突的問題 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.4.1.Final</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.1.0.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.logging/jboss-logging -->
<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.1.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml/classmate -->
<dependency>
<groupId>com.fasterxml</groupId>
<artifactId>classmate</artifactId>
<version>1.3.3</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.8.1</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.0.0</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.7</version>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency>
</dependencies>
</project>
2)web.xml(注意:去掉了監聽器和上下文參數)
<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name>spring_demo</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<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:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
3)去掉了applicationContext.xml、db.properties、SqlMapConfig.xml三個配置檔案
4)删除了com.yy.mapper包和com.yy.service包中的實作類(接口留着)
3. 業務邏輯和資料通路層項目
1)pom.xml
<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>
<groupId>com.yy</groupId>
<artifactId>ssm_dept2_m</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<plugins>
<!-- 資源檔案拷貝插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.7</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<!-- java編譯插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<!-- 部署路徑,如:/e3mall,表明部署到/e3mall路徑下 -->
<path>/</path>
<!-- 端口号 -->
<port>8089</port>
<uriEncoding>utf-8</uriEncoding>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.10</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.6</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.2.5</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<!--解決Spring使用slf4j輸出日志與log4j沖突的問題 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.4.1.Final</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.1.0.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.logging/jboss-logging -->
<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.1.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml/classmate -->
<dependency>
<groupId>com.fasterxml</groupId>
<artifactId>classmate</artifactId>
<version>1.3.3</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.0.0</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.7</version>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency>
</dependencies>
</project>
- web.xml(删除了前端控制器Servlet的配置)
<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name>spring_demo</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
</web-app>
3)删除了springmvc.xml
4)删除了com.yy.controller包和所有jsp頁面
二、在linux中安裝zookeeper
1)測試java環境
java -version
2)SSH上傳提示:encountered 1 errors during the transfer錯誤解決辦法
上傳的時候 windows 的路徑不能存在括号“()”, 把括号去掉 重新上傳就好了 或
把檔案移到不帶小括号的路徑下就可以正常上傳檔案了。
3)zookeeper是java開發的可以運作在windows、linux環境。需要先安裝jdk。
安裝步驟:
第一步:安裝jdk
第二步:把zookeeper的壓縮包上傳到linux系統。
第三步:解壓縮壓縮包
tar -zxvf zookeeper-3.4.6.tar.gz
第四步:進入zookeeper-3.4.6目錄,建立data檔案夾。
mkdir data
第五步:進入conf檔案夾,把zoo_sample.cfg改名為zoo.cfg
第六步:編輯 zoo.cfg(vim zoo.cfg),修改data屬性:dataDir=/root/zookeeper-3.4.6/data
第七步:啟動zookeeper
關閉:
檢視狀态:
成功啟動顯示如下内容:
JMX enabled by default
Using config: /root/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: standalone
注意:需要關閉防火牆。
service iptables stop
永久關閉修改配置開機不啟動防火牆:
chkconfig iptables off
如果不能成功啟動zookeeper,需要删除data目錄下的zookeeper_server.pid檔案。
三、通過dubbo在表示層中通路業務邏輯層中的元件
- 業務邏輯項目中釋出元件(在applicationContext.xml中添加)
<!-- 使用dubbo釋出服務 -->
<dubbo:application name="ssm_dept2_m"/>
<!-- address為虛拟機zookeeper位址及端口号,叢集時候可以配置多個位址 -->
<dubbo:registry protocol="zookeeper" address="192.168.220.129:2181"></dubbo:registry>
<!-- 用dubbo協定在20880端口暴露服務 -->
<dubbo:protocol name="dubbo" port="20880" />
<!-- 聲明需要暴露的接口,ref為該接口的實作類,為自動掃描到的元件 -->
<dubbo:service interface="com.yy.service.DeptService" ref="deptServiceImpl"></dubbo:service>
<dubbo:service interface="com.yy.service.EmpService" ref="empServiceImpl"></dubbo:service>
- 在表示層項目中引用元件(在springmvc.xml中添加)
<!-- 引用dubbo服務-->
<!-- name為目前項目名即可 -->
<dubbo:application name="ssm_dept2_vc"/>
<dubbo:registry protocol="zookeeper" address="192.168.220.129:2181"></dubbo:registry>
<!-- id相當于引用後為引用bean起的id -->
<dubbo:reference interface="com.yy.service.DeptService" id="deptService"></dubbo:reference>
<dubbo:reference interface="com.yy.service.EmpService" id="empService"></dubbo:reference>
- 先啟動業務邏輯項目,在啟動表示層項目(注意:修改兩個項目中tomcat的端口号不相同)
- 在浏覽器中通路action,測試
四、說明
Dubbo是什麼?
Dubbo是一個分布式服務架構,緻力于提供高性能和透明化的RPC遠端服務調用方案,以及SOA服務治理方案。簡單的說,dubbo就是個服務架構,如果沒有分布式的需求,其實是不需要用的,隻有在分布式的時候,才有dubbo這
樣的分布式服務架構的需求,并且本質上是個服務調用的東東,說白了就是個遠端服務調用的分布式架構(告别Web Service模式中的WSdl,以服務者與消費者的方式在dubbo上注冊)
其核心部分包含:
- 遠端通訊: 提供對多種基于長連接配接的NIO架構抽象封裝,包括多種線程模型,序列化,以及“請求-響應”模式的資訊交換方式。
- 叢集容錯: 提供基于接口方法的透明遠端過程調用,包括多協定支援,以及軟負載均衡,失敗容錯,位址路由,動态配置等叢集支援。
- 自動發現: 基于注冊中心目錄服務,使服務消費方能動态的查找服務提供方,使位址透明,使服務提供方可以平滑增加或減少機器。
Dubbo能做什麼?
- 透明化的遠端方法調用,就像調用本地方法一樣調用遠端方法,隻需簡單配置,沒有任何API侵入。
- 軟負載均衡及容錯機制,可在内網替代F5等硬體負載均衡器,降低成本,減少單點。
- 服務自動注冊與發現,不再需要寫死服務提供方位址,注冊中心基于接口名查詢服務提供者的IP位址,并且能夠平滑添加或删除服務提供者。