随着现在项目越来越大,业务也越来越多,如果还像以往一样写在service层中,那么将会有很多的代码,到时候如果命名不科学,要你去修改某个业务,可想而知,很不想从这么多的业务中去查找你想要寻找的业务。因此分布式服务框架诞生了。分布式服务框架强调的是业务分离,每个业务都是一个独立的模板,彼此之间的联系并不多。在需要某个模板时,只需用Maven引入即可。
接着我们看看什么是Dubbo和Zookeeper。Zookeeper顾名思义,动物管理员,而dubbo就相当于动物。在分布式的项目中,server和service层被拆分开来,需要在server层中调用service层的接口,但是运行在不同Tomcat下的服务无法直接互调接口。所有我们需要通过dubbo建立service这个服务,然后到zookeeper上面注册,填写对应的zookeeper服务所在的IP及端口号。当server层需要调用service接口时,需使用dubbo再来引入注册进入的dubbo服务。下面是一个小的例子演示(不过在这里由于只有一个业务,因此我们把各个层当成一个独立的业务)。
项目整体结构如下:
1、新建一个Maven工程
2、建立项目完成后,右键点击项目名,选择new->module,然后选择Maven项目,项目名ssm_bean(!如果代码报红,在pom.xml导入相应的依赖)
com.zhongruan.dao
Role.java
package com.zhongruan.bean;
import java.io.Serializable;
public class Role implements Serializable {
private int id;
private String role;
private String roleDes;
@Override
public String toString() {
return "Role{" +
"id=" + id +
", role='" + role + '\'' +
", roleDes='" + roleDes + '\'' +
'}';
}
public void setRoleDes(String roleDes) {
this.roleDes = roleDes;
}
public String getRoleDes() {
return roleDes;
}
public int getId() {
return id;
}
public String getRole() {
return role;
}
public void setId(int id) {
this.id = id;
}
public void setRole(String role) {
this.role = role;
}
}
UserInfo.java
package com.zhongruan.bean;
import java.io.Serializable;
public class UserInfo implements Serializable {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public String getUsername() {
return username;
}
public String getPassword() {
return password;
}
public void setId(int id) {
this.id = id;
}
public void setUsername(String username) {
this.username = username;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "UserInfo{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
3、完成ssm_bean模板后,继续右键点击项目名(ssm_parent),选择new->module,然后选择Maven项目,项目名ssm_dao
com.zhongruan.dao
IRoleDao.java
package com.zhongruan.dao;
import com.zhongruan.bean.Role;
import java.util.List;
public interface IRoleDao {
public List<Role> getRoleByUserId(int id);
}
IUserInfo.java
package com.zhongruan.dao;
import com.zhongruan.bean.UserInfo;
import java.util.List;
public interface IUserInfoDao {
public List<UserInfo> findAll();
public UserInfo login(UserInfo userInfo);
public void addUser(UserInfo userInfo);
public UserInfo selectById(int id);
public void updateUser(UserInfo userInfo);
public void deleteUser(int id);
public UserInfo selectByUsername(String name);
public void deleteAll(List<Integer> ids);
}
然后在Resources文件夹下新建mapper文件夹。里面主要有两个文件。
RoleMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.zhongruan.dao.IRoleDao">
<select id="getRoleByUserId" resultType="Role" parameterType="int">
select * from role where id in (select rid from user_role where uid = #{id});
</select>
</mapper>
UserInfoMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.zhongruan.dao.IUserInfoDao" >
<select id="findAll" resultType="com.zhongruan.bean.UserInfo">
select * from userinfo
</select>
<select id="login" resultType="com.zhongruan.bean.UserInfo" parameterType="UserInfo">
select * from userinfo where username =#{username}
and password = #{password}
</select>
<insert id="addUser" parameterType="UserInfo">
insert into userinfo (username,password) values (#{username},#{password})
</insert>
<select id="selectById" parameterType="int" resultType="UserInfo">
select * from userinfo where id = #{id}
</select>
<update id="updateUser" parameterType="UserInfo">
update userinfo set username = #{username} , password = #{password}
where id = #{id}
</update>
<delete id="deleteUser" parameterType="int">
delete from userinfo where id = #{id}
</delete>
<select id="selectByUsername" parameterType="String" resultType="UserInfo">
select * from userinfo where username = #{username}
</select>
<delete id="deleteAll" parameterType="int">
delete from userinfo where id in
<foreach collection="list" item="id" open="(" close=")" separator=",">
#{id}
</foreach>
</delete>
</mapper>
4、完成ssm_dao模板后,继续右键点击项目名(ssm_parent),选择new->module,然后选择Maven项目,项目名ssm_service
com.zhongruan.service
IUserInfoService.java
package com.zhongruan.service;
import com.zhongruan.bean.UserInfo;
import java.util.List;
public interface IUserInfoServer {
public List<UserInfo> findAll(int page, int size);
public boolean login(UserInfo userInfo);
public void addUser(UserInfo userInfo);
public UserInfo selectById(int id);
public void updateUser(UserInfo userInfo);
public void deleteUser(int id);
public void deleteAllUser(List<Integer> ids);
}
com.zhongruan.service.Impl
UserInfoServerImpl.java
package com.zhongruan.service.Impl;
import com.github.pagehelper.PageHelper;
import com.zhongruan.bean.UserInfo;
import com.zhongruan.dao.IRoleDao;
import com.zhongruan.dao.IUserInfoDao;
import com.zhongruan.service.IUserInfoServer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service("userInfoServer")
public class UserInfoServerImpl implements IUserInfoServer {
@Autowired
private IUserInfoDao userInfoDao;
@Autowired
private IRoleDao roleDao;
@Override
public List<UserInfo> findAll(int page, int size) {
PageHelper.startPage(page,size);
return userInfoDao.findAll();
}
@Override
public boolean login(UserInfo userInfo) {
if(userInfoDao.login(userInfo)==null){
return false;
}else{
return true;
}
}
@Override
public void addUser(UserInfo userInfo) {
userInfoDao.addUser(userInfo);
}
@Override
public UserInfo selectById(int id) {
return userInfoDao.selectById(id);
}
@Override
public void updateUser(UserInfo userInfo) {
userInfoDao.updateUser(userInfo);
}
@Override
public void deleteUser(int id) {
userInfoDao.deleteUser(id);
}
@Override
public void deleteAllUser(List<Integer> ids) {
userInfoDao.deleteAll(ids);
}
}
5、完成ssm_service模板后,继续右键点击项目名(ssm_parent),选择new->module,然后选择Maven项目,项目名ssm_ex_service,这里面代码和ssm_service项目中 UserInfoServer(com.ex.service)代码一样。
6、完成ssm_ex_service模板后,继续右键点击项目名(ssm_parent),选择new->module,然后选择Maven项目,项目名ssm_ex_service_impl,这里面代码和ssm_service项目中 UserInfoServerImpl(com.ex.serviceImpl)代码一样,还要加一个App.java
com.ex.serviceImpl
App.java
package com.ex.serviceImpl;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args ) throws IOException {
ClassPathXmlApplicationContext context =
new ClassPathXmlApplicationContext("classpath:spring-context.xml");
context.start();
System.in.read();
/* synchronized (App.class) {
while (true) {
try {
App.class.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}*/
}
}
Resources中放入配置文件。
db.properties:
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/user
jdbc.username=root
jdbc.password=xiaoming555
log4j.properties:
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
spring-context.xml
<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
<import resource="spring-dao.xml"></import>
<import resource="spring-dubbo.xml"></import>
</beans>
spring-dao.xml
<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="2"/>
</bean>
<!-- 配置sessionFactory -->
<bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 指定配置文件位置 -->
<!--<property name="configLocation" value="classpath:mybatis.xml"/>-->
<!--配置别名-->
<property name="typeAliasesPackage" value="com.zhongruan.bean"></property>
<!--配置加载映射文件 UserMapper.xml-->
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>
<!-- 自动生成dao,mapper-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.zhongruan.dao"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
</bean>
<!-- 配置事务-->
<!-- 5.配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 6.开启事务注解-->
<tx:annotation-driven></tx:annotation-driven>
</beans>
spring-dubbo.xml
<?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:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://code.alibabatech.com/schema/dubbo
http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!--配置dubbo的应用名称-->
<dubbo:application name="ssm_ex_service"/>
<!--注册中心 192.168.1.37- 10.28.231.165-->
<dubbo:registry protocol="zookeeper" address="192.168.11.78:2181"></dubbo:registry>
<!-- 用dubbo协议在20880端口暴露服务 -->
<dubbo:protocol name="dubbo" port="20880" />
<!-- 声明需要暴露的服务接口 -->
<dubbo:service interface="com.ex.service.IUserInfoServer" ref="userService" />
<bean id="userService" class="com.ex.serviceImpl.UserInfoServerImpl"/>
</beans>
7、完成ssm_ex_serviceimpl模板后,继续右键点击项目名(ssm_parent),选择new->module,然后选择Maven项目,项目名ssm_ex_web(这里的Maven项目为webApp)
com.ex.controller
UserInfoController
package com.ex.controller;
import com.ex.service.IUserInfoServer;
import com.github.pagehelper.PageInfo;
import com.zhongruan.bean.UserInfo;
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.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
@Controller
@RequestMapping("user")
public class UserInfoController {
@Autowired
private IUserInfoServer userInfoServer;
@RequestMapping("findAll.do")
public ModelAndView findAll(@RequestParam(defaultValue = "1") int page, @RequestParam(defaultValue = "5") int size){
ModelAndView mv = new ModelAndView();
List<UserInfo> userInfos =userInfoServer.findAll(page,size);
PageInfo pageInfo = new PageInfo(userInfos);
mv.addObject("pageInfo",pageInfo);
mv.setViewName("user-list");
return mv;
}
@RequestMapping("login.do")
public ModelAndView login(String username, String password, HttpServletRequest httpServletRequest) {
ModelAndView mv = new ModelAndView();
if(username==null){
mv.setViewName("../login");
}else {
UserInfo userInfo = new UserInfo();
userInfo.setPassword(password);
userInfo.setUsername(username);
if (userInfoServer.login(userInfo)) {
mv.setViewName("main");
} else {
mv.setViewName("../failer");
}
}
return mv;
}
@RequestMapping("addUser.do")
public String addUser(UserInfo userInfo){
userInfoServer.addUser(userInfo);
return "redirect:findAll.do";
}
@RequestMapping("toUpdate.do")
public ModelAndView toUpdate(int id){
UserInfo userInfo = userInfoServer.selectById(id);
ModelAndView mv = new ModelAndView();
mv.addObject("userinfo",userInfo);
mv.setViewName("user-update");
return mv;
}
@RequestMapping("upDate.do")
public String upDate(UserInfo userInfo){
userInfoServer.updateUser(userInfo);
return "redirect:findAll.do";
}
@RequestMapping("delete.do")
public String delete(int id){
userInfoServer.deleteUser(id);
return "redirect:findAll.do";
}
@RequestMapping("deleteAll.do")
@ResponseBody
public String deleteAll(String userlist){
String[] strs = userlist.split(",");
List<Integer> ids = new ArrayList<>();
for (int i=0;i<strs.length;i++){
ids.add(Integer.parseInt(strs[i]));
}
userInfoServer.deleteAllUser(ids);
return "";
}
}
Resources中的配置文件
applicatonContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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.ex"></context:component-scan>
<!-- 消费方应用名,用于计算依赖关系,不是匹配条件,不要与提供方一样 -->
<dubbo:application name="ssm_ex_web"/>
<!-- 使用zookeeper注册中心暴露服务地址 -->
<!-- 注册中心地址 -->
<dubbo:registry protocol="zookeeper" address="192.168.11.78:2181" />
<!-- 用户服务接口 -->
<dubbo:reference interface="com.ex.service.IUserInfoServer" id="userInfoServer" check="false" />
</beans>
log4j.xml
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
springmvc.xml
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
<!-- 1.注解扫描位置-->
<context:component-scan base-package="com.ex.controller" />
<!-- 2.配置映射处理和适配器-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
<!-- 3.视图的解析器-->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/pages/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
webApp中的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<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">
<!-- 配置加载类路径的配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext.xml</param-value>
</context-param>
<!-- 配置监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<!-- 解决中文乱码过滤器 -->
<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>
<!--
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
-->
<!-- 前端控制器(加载classpath:spring-mvc.xml 服务器启动创建servlet) -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置初始化参数,创建完DispatcherServlet对象,加载springmvc.xml配置文件 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:springmvc.xml</param-value>
</init-param>
<!-- 服务器启动的时候,让DispatcherServlet对象创建 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
在这里没有展示前端代码
首先我们运行App.java(在打开zookeeper的情况下)出现下面的情况就运行正确了
接着运行Tomcat服务器,成功跳转到首页