关于dubbo改造ssm项目的一些总结

1.首先建立四个maven项目

dubbo-parent为父项目,打包方式为pom
在pom.xml文件中导入相关的依赖
dubbo-parent/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>4.0.0modelVersion>
  <groupId>com.wuhongyugroupId>
  <artifactId>dubbo-parentartifactId>
  <version>0.0.1-SNAPSHOTversion>
  <packaging>pompackaging>

  
    <properties>
        <spring.version>5.0.4.RELEASEspring.version>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    properties>
  <dependencies>
        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>3.0.1version>
            <scope>providedscope>
        dependency>


        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
            <scope>testscope>
        dependency>
        
        <dependency>
            <groupId>org.aspectjgroupId>
            <artifactId>aspectjweaverartifactId>
            <version>1.6.2version>
        dependency>
        
        <dependency>
            <groupId>aopalliancegroupId>
            <artifactId>aopallianceartifactId>
            <version>1.0version>
        dependency>

        
        <dependency>
            <groupId>cglibgroupId>
            <artifactId>cglibartifactId>
            <version>3.2.6version>
        dependency>

        
        <dependency>
            <groupId>commons-poolgroupId>
            <artifactId>commons-poolartifactId>
            <version>1.6version>
        dependency>
        <dependency>
            <groupId>commons-beanutilsgroupId>
            <artifactId>commons-beanutilsartifactId>
            <version>1.9.2version>
        dependency>
        <dependency>
            <groupId>commons-langgroupId>
            <artifactId>commons-langartifactId>
            <version>2.6version>
        dependency>
        <dependency>
            <groupId>commons-fileuploadgroupId>
            <artifactId>commons-fileuploadartifactId>
            <version>1.3.1version>
        dependency>
        <dependency>
            <groupId>commons-codecgroupId>
            <artifactId>commons-codecartifactId>
            <version>1.9version>
        dependency>

        

        <dependency>
            <groupId>org.apache.logging.log4jgroupId>
            <artifactId>log4j-coreartifactId>
            <version>2.11.0version>
        dependency>
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-log4j12artifactId>
            <version>1.7.12version>
        dependency>
        
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.2.8version>
        dependency>
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatis-springartifactId>
            <version>1.2.2version>
        dependency>
        

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-ormartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-testartifactId>
            <version>${spring.version}version>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-context-supportartifactId>
            <version>${spring.version}version>
        dependency>
        
        
        
        <dependency>
            <groupId>taglibsgroupId>
            <artifactId>standardartifactId>
            <version>1.1.2version>
        dependency>
        <dependency>
            <groupId>javax.servlet.jsp.jstlgroupId>
            <artifactId>jstl-apiartifactId>
            <version>1.2version>
            <exclusions>
                <exclusion>
                    <groupId>javax.servletgroupId>
                    <artifactId>servlet-apiartifactId>
                exclusion>
                <exclusion>
                    <groupId>javax.servlet.jspgroupId>
                    <artifactId>jsp-apiartifactId>
                exclusion>
            exclusions>
        dependency>
        
        
        <dependency>
            <groupId>com.fasterxml.jackson.coregroupId>
            <artifactId>jackson-databindartifactId>
            <version>2.9.4version>
        dependency>

        
        <dependency>
            <groupId>org.javassistgroupId>
            <artifactId>javassistartifactId>
            <version>3.22.0-GAversion>
        dependency>
        
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.24version>
        dependency>
        
    <dependency>
        <groupId>com.github.pagehelpergroupId>
        <artifactId>pagehelperartifactId>
        <version>5.1.2version>
    dependency>
        
    <dependency>
        <groupId>org.freemarkergroupId>
        <artifactId>freemarkerartifactId>
        <version>2.3.28version>
    dependency>
    <dependency>
      <groupId>org.apache.zookeepergroupId>
      <artifactId>zookeeperartifactId>
      <version>3.4.9version>
    dependency>
    
    <dependency>
      <groupId>com.alibabagroupId>
      <artifactId>dubboartifactId>
      <version>2.5.3version>
      <exclusions>
        <exclusion>
          <groupId>org.springframeworkgroupId>
          <artifactId>springartifactId>
        exclusion>
      exclusions>
    dependency>
    <dependency>
      <groupId>com.101tecgroupId>
      <artifactId>zkclientartifactId>
      <version>0.10version>
    dependency>

    dependencies>
  <modules>
    <module>dubbo-apimodule>
    <module>dubbo-servermodule>
    <module>dubbo-webmodule>
  modules>
project>

dubbo-api为接口和实体类 打包方式为jar
目录结构为

这里有一些坑:
1.因为dubbo实际上是通过序列化和反序列化实现的,所以实体类的对象必须实现序列化接口,实体类对象的子类(如果有的话)也需要添加版本号.
2.如果实体类中有时间类型(Date),一定要写java.util.Date,如果写java.sql.Date消费层像服务层传对象的时候会出现NullPointException的异常
User.java的代码:

package com.wuhongyu.entity;

import java.io.Serializable;

public class User implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = -5584068694070223356L;

    private Long id;

    private String username;

    private String password;

    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username == null ? null : username.trim();
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }
}

UserService接口代码

package com.wuhongyu.service;

import java.util.List;

import com.wuhongyu.entity.User;

public interface UserService {

    public List selectAll();
}

dubbo-server为dubbo的服务者,提供接口的实现类给消费者(dubbo-web)使用,打包方式为war
目录结构
这里的报错是eclipse校验xml文件的问题,对项目运行没有影响

要将上一步配置的dubbo-api作为依赖引入dubbo-server
dubbo-server/pom.xml配置如下:

<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0modelVersion>
  <parent>
    <groupId>com.wuhongyugroupId>
    <artifactId>dubbo-parentartifactId>
    <version>0.0.1-SNAPSHOTversion>
  parent>
  <groupId>com.wuhongyugroupId>
  <artifactId>dubbo-serverartifactId>
  <version>1.0version>
  <packaging>warpackaging>
  <name>dubbo-server Maven Webappname>
  <url>http://maven.apache.orgurl>
  <dependencies>
    <dependency>
      <groupId>com.wuhongyugroupId>
      <artifactId>dubbo-apiartifactId>
      <version>1.0version>
    dependency>
  dependencies>
  <build>
    <finalName>dubbo-serverfinalName>
  build>
project>

UserMapper.java和UserMapper.xml为MyBatis逆向工程自动生成的文件
UserServiceImpl为UserService的实现类
注意:
本项目中PageHelper不能在dubbo-web的conrtoller层使用,如果使用分页会失效
所以我在dubbo-server里的mapper之前使用来完成分页

package com.wuhongyu.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.github.pagehelper.PageHelper;
import com.wuhongyu.entity.User;
import com.wuhongyu.entity.UserExample;
import com.wuhongyu.mapper.UserMapper;
import com.wuhongyu.service.UserService;

@Service("userService")
public class UserServiceImpl implements UserService{

    @Autowired
    private UserMapper userMapper;

    @Override
    public List selectAll() {
        UserExample example = new UserExample();
        example.createCriteria();
        PageHelper.startPage(1, 3);
        List userList = userMapper.selectByExample(example);
        return userList;
    }



}

spring和dubbo的配置文件:
applicationContext-dubbo.xml

<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">

    <dubbo:application name="dubbo-server"/>


    <dubbo:registry address="zookeeper://localhost:2181" />
    
    <dubbo:protocol name="dubbo" port="20880" />

    <dubbo:service interface="com.wuhongyu.service.UserService"
        ref="userService" protocol="dubbo" />
beans>

spring的配置文件applicationContext-spring.xml
该文件没有改动,直接从ssm项目中copy过来

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd"
    default-autowire="byName">
    
    <context:component-scan base-package="com.wuhongyu.service.impl" />
    
    
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/test" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    bean>
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        
        <property name="dataSource" ref="dataSource" />
        
        <property name="mapperLocations" value="classpath:com/wuhongyu/mapper/*.xml">property>
        
        <property name="plugins">
           <array>
             <bean class="com.github.pagehelper.PageInterceptor">
               <property name="properties">
                 <value>
                   helperDialect=mysql
                 value>
               property>
             bean>
           array>
         property>
    bean>
    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.wuhongyu.mapper" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    bean>
    
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" />
    
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="ins*" />
            <tx:method name="upd*" />
            <tx:method name="del*" />
            
        tx:attributes>
    tx:advice>
    
    <aop:config>
        <aop:pointcut expression="execution(* com.wuhongyu.service.impl.*.*(..))" id="pt"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt" />
    aop:config>
    <aop:aspectj-autoproxy  proxy-target-class="true"/>

beans>

我是在tomcat中启动的程序,所以要配置web.xml,web.xml只需要加载spring配置文件即可
其实这里的服务端也可以用一个main方法来加载spring的配置文件来启动该项目
web.xml配置:

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">

    
    <context-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>classpath:spring/applicationContext*.xmlparam-value>
    context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
    listener>


web-app>

打开zookeeper
运行zookeeper的bin目录下面的zkServer.cmd
如果出现cmd一闪的情况,原因是环境变量里没有配置java的CLASSPATH
百度配置java环境变量配置完成即可

把dubbo-server项目部署到tomcat下启动
注意:
最好多弄几个tomcat服务器,可以自行百度如何启动多个tomcat

启动成功后打开zookeeper服务监控中心,UserService服务已经发布出来

接下来编写dubbo-web(消费者端)
dubbo-web结构如下:

同样,dubbo-web也需要引入dubbo-api依赖
dubbo-web/pom.xml

<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0modelVersion>
  <parent>
    <groupId>com.wuhongyugroupId>
    <artifactId>dubbo-parentartifactId>
    <version>0.0.1-SNAPSHOTversion>
  parent>
  <groupId>com.wuhongyugroupId>
  <artifactId>dubbo-webartifactId>
  <version>1.0version>
  <packaging>warpackaging>
  <name>dubbo-web Maven Webappname>
  <url>http://maven.apache.orgurl>
  <dependencies>
    <dependency>
      <groupId>com.wuhongyugroupId>
      <artifactId>dubbo-apiartifactId>
      <version>1.0version>
    dependency>
  dependencies>
  <build>
    <finalName>dubbo-webfinalName>
  build>
project>

消费者dubbo的配置文件springmvc-dubbo.xml

<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">
    <dubbo:application name="dubbo-web"/>
    
    <dubbo:registry address="zookeeper://localhost:2181"/>
    
    <dubbo:reference id="userService" interface="com.wuhongyu.service.UserService"/>

beans>

springmvc的配置文件springmvc.xml
文件上传对于本项目来说可以删掉

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    
    <context:component-scan base-package="com.wuhongyu.controller">context:component-scan>
    
    <mvc:annotation-driven/>
    
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        
        <property name="maxUploadSize">
            <value>5242880value>
        property>
    bean>


    
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".jsp" />
    bean>

beans>

编写UserController

package com.wuhongyu.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.github.pagehelper.PageInfo;
import com.wuhongyu.entity.User;
import com.wuhongyu.service.UserService;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/userList")
    @ResponseBody
    public List userList() {
        List userList = userService.selectAll();
        PageInfo page = new  PageInfo(userList);
        return userList;
    }

}

dubbo-web也需要在tomcat服务器上启动所以,配置web.xml
web.xml

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">
    
    <filter>
        <filter-name>CharacterEncodingFilterfilter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
        <init-param>
            <param-name>encodingparam-name>
            <param-value>utf-8param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>


    
    <servlet>
        <servlet-name>springmvcservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        
        <init-param>
            <param-name>contextConfigLocationparam-name>
            <param-value>classpath:spring/springmvc*.xmlparam-value>
        init-param>
        <load-on-startup>1load-on-startup>
    servlet>

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

    
    <servlet-mapping>
        <servlet-name>defaultservlet-name>
        <url-pattern>*.jsurl-pattern>
        <url-pattern>*.cssurl-pattern>
        <url-pattern>*.htmlurl-pattern>
        <url-pattern>/images/*url-pattern>
    servlet-mapping>


    <welcome-file-list>
        <welcome-file>index.jspwelcome-file>
        <welcome-file>index.htmlwelcome-file>
        <welcome-file>index.htmwelcome-file>
    welcome-file-list>
web-app>

到此,配置完成,在另一台tomcat上部署dubbo-web

部署成功后输入地址
项目运行成功

项目源码地址:
https://github.com/ruanruanBlue/dubbo-parent
如果有什么问题欢迎提问和指出