文章目录
一、案例介绍
1.1 需求
1.2 项目架构方式
1.3 技术选型
二、创建表
三、项目设计
四、创建项目
1.创建dubbo-parent
1.1 创建项目
1.2 修改POM文件
2.创建dubbo-pojo
2.1 创建项目
2.2 创建实体类
3.创建dubbo-mapper
3.1 创建项目
3.2 创建UserMapper接口
3.3 创建 UsersMapper 映射配置文件
3.4 4修改 POM 文件
4.创建服务提供者相关项目
4.1创建dubbo-user-provider
4.1.1 创建项目
4.2创建dubbo-user-interface
4.2.1 创建项目
4.2.2 修改POM文件
4.3创建dubbo-user-service
4.3.1 创建项目
4.3.2 修改POM文件
4.3.3 配置MyBatis与Dubbo
db.properties
applicationContext-dao.xml
applicationContext-service.xml
applicationContext-trans.xml
SqlMapperClient.xml
application-dubbo.xml
4.3.3 测试整合
5.创建服务消费者相关项目
5.1创建dubbo-user-consumer
5.1.1 创建项目
5.2创建dubbo-user-portal-service
5.2.1 创建项目
5.2.2 修改POM文件
5.3创建dubbo-user-portal
5.3.1 创建项目(war)
5.3.2 修改POM文件
5.3.3 配置 SpringMVC,Spring,web.xml,Dubbo
applicationContext-dubbo.xml
applicationContext-service.xml
springmvc.xml
web.xml
5.3.4 测试整合
一、案例介绍
1.1 需求
完成对用户表的CRUD操作。
1.2 项目架构方式
SOA面向服务架构
1.3 技术选型
maven,Spring,SpringMVC,Mybatis,Dubbo,Zookeeper,MySql
二、创建表
CREATE TABLE `users` ( `userid` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(30) DEFAULT NULL, `userage` int(11) DEFAULT NULL, PRIMARY KEY (`userid`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
三、项目设计
dubbo-parent (POM) |--dubbo-pojo (jar) |--dubbo-mapper (jar) |--dubbo-user-provider (POM) |--dubbo-user-provider-interface (jar) |--dubbo-user-provider-service (jar) |--dubbo-user-consumer (pom) |--dubbo-user-consumer-portal-service (jar) |--dubbo-user-consumer-protal (war)
四、创建项目
1.创建dubbo-parent
1.1 创建项目
1.2 修改POM文件
<!-- 对依赖的jar包的版本统一进行定义 --> <properties> <junit.version>4.12</junit.version> <spring.version>4.1.3.RELEASE</spring.version> <mybatis.version>3.2.8</mybatis.version> <mybatis.spring.version>1.2.2</mybatis.spring.version> <mysql.version>5.1.32</mysql.version> <slf4j.version>1.6.4</slf4j.version> <druid.version>1.0.9</druid.version> <jstl.version>1.2</jstl.version> <servlet-api.version>2.5</servlet-api.version> <tomcat.version>2.2</tomcat.version> <jsp-api.version>2.0</jsp-api.version> <zkClient-version>0.10</zkClient-version> <dubbo-version>2.5.4</dubbo-version> </properties> <!-- jar包的依赖注入 ,由于该工程是一个父工程,所以jar包在该pom文件中只是声明 --> <dependencyManagement> <dependencies> <!-- 单元测试 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> </dependency> <!-- 日志处理 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <!-- Mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis.spring.version}</version> </dependency> <!-- MySql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!-- 连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> <!-- Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring.version}</version> </dependency> <!-- JSP相关 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>${jstl.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet-api.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jsp-api</artifactId> <version>${jsp-api.version}</version> <scope>provided</scope> </dependency> <!-- dubbo --> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>${dubbo-version}</version> </dependency> <dependency> <groupId>com.101tec</groupId> <artifactId>zkclient</artifactId> <version>${zkClient-version}</version> </dependency> </dependencies> </dependencyManagement> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> </resources> <!-- tomcat插件,由于子项目不一定每个都是web项目,所以该插件只是声明,并未开启 --> <pluginManagement> <plugins> <!-- 配置Tomcat插件 --> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>${tomcat.version}</version> </plugin> </plugins> </pluginManagement> </build>
2.创建dubbo-pojo
2.1 创建项目
2.2 创建实体类
package com.bobo.pojo; public class User { private int id; private String username; private int userage; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getUserage() { return userage; } public void setUserage(int userage) { this.userage = userage; } }
3.创建dubbo-mapper
3.1 创建项目
3.2 创建UserMapper接口
package com.bobo.mapper; /** * UsersMapper接口文件 * @author dengp * */ public interface UsersMapper { }
3.3 创建 UsersMapper 映射配置文件
<?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.bobo.mapper.UsersMapper"> </mapper>
3.4 4修改 POM 文件
<dependencies> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-pojo</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <!-- Mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> </dependency> <!-- MySql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!-- 连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> </dependency> </dependencies> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> </resources> </build>
4.创建服务提供者相关项目
4.1创建dubbo-user-provider
4.1.1 创建项目
4.2创建dubbo-user-interface
4.2.1 创建项目
4.2.2 修改POM文件
<dependencies> <!-- 依赖 pojo --> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-pojo</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies>
4.3创建dubbo-user-service
4.3.1 创建项目
4.3.2 修改POM文件
<dependencies> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-user-interface</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-mapper</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> </dependency> <dependency> <groupId>com.101tec</groupId> <artifactId>zkclient</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> </dependency> </dependencies>
4.3.3 配置MyBatis与Dubbo
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8 jdbc.username=root jdbc.password=123456
applicationContext-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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 配置解析properties文件的工具类 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 配置数据源 dataSource --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close"> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="driverClassName" value="${jdbc.driver}" /> <property name="maxActive" value="10" /> <property name="minIdle" value="5" /> </bean> <!-- 创建mybatis的上下文对象 --> <bean class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource"> <ref bean="dataSource"/> </property> <property name="configLocation"> <value>classpath:SqlMapperClient.xml</value> </property> </bean> <!-- 扫描mybatis的接口与映射配置文件 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.bobo.mapper"/> </bean> </beans>
applicationContext-service.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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 扫描bean对象 --> <context:component-scan base-package="com.bobo.dubbo.service.impl"/> </beans>
applicationContext-trans.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 配置事物管理器的切面 --> <bean id="transactionMananger" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 配置事物传播行为 :其实就是那些方法应该受什么样的事物控制--> <tx:advice id="advice" transaction-manager="transactionMananger"> <tx:attributes> <tx:method name="add*" propagation="REQUIRED"/> <tx:method name="modify*" propagation="REQUIRED"/> <tx:method name="update*" propagation="REQUIRED"/> <tx:method name="dorp*" propagation="REQUIRED"/> <tx:method name="del*" propagation="REQUIRED"/> <tx:method name="find*" read-only="true"/> </tx:attributes> </tx:advice> <!-- 那些类下的方法需要参与到当前的事物管理中 。配置切点 --> <aop:config> <aop:advisor advice-ref="advice" pointcut="execution(* com.bobo.dubbo.service.impl*.*(..))"/> </aop:config> </beans>
SqlMapperClient.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> </configuration>
application-dubbo.xml
服务提供者的配置文件我们放到META-INF/spring/目录下,我们通过main方法启动会自动加载该文件。
<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 导入Spring相关的配置文件 --> <import resource="../../applicationContext-dao.xml" /> <import resource="../../applicationContext-service.xml" /> <import resource="../../applicationContext-trans.xml" /> <dubbo:application name="user-provider" /> <dubbo:registry protocol="zookeeper" address="192.168.88.171:2181,192.168.88.172:2181,192.168.88.173:2181"/> <dubbo:protocol name="dubbo" port="20880"/> </beans>
4.3.3 测试整合
package com.bobo; import com.alibaba.dubbo.container.Main; public class Start { /** * 特点: * 1,自带线程阻塞 * 2,支持优雅关系 * Main 类下的 main 方法在启动时默认的回去 classpath:/META-INF/spring/*.xml * @param args */ public static void main(String[] args) { Main.main(args); } }
5.创建服务消费者相关项目
创建消费者相关的服务。
5.1创建dubbo-user-consumer
5.1.1 创建项目
5.2创建dubbo-user-portal-service
5.2.1 创建项目
5.2.2 修改POM文件
<dependencies> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-user-interface</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-pojo</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> </dependency> </dependencies>
5.3创建dubbo-user-portal
5.3.1 创建项目(war)
5.3.2 修改POM文件
<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.bobo</groupId> <artifactId>dubbo-user-consumer</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>dubbo-user-portal</artifactId> <packaging>war</packaging> <dependencies> <!-- 单元测试 --> <dependency> <groupId>com.bobo</groupId> <artifactId>dubbo-user-portal-service</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> </dependency> <!-- 日志处理 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </dependency> <!-- Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</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 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> </dependency> <dependency> <groupId>com.101tec</groupId> <artifactId>zkclient</artifactId> </dependency> </dependencies> <build> <plugins> <!-- 配置Tomcat插件 --> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <configuration> <!-- path: 上传的war包解压后的路径命名 --> <path>/</path> <port>8082</port> </configuration> </plugin> </plugins> </build> </project>
项目报错手动添加web.xml文件
5.3.3 配置 SpringMVC,Spring,web.xml,Dubbo
applicationContext-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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <dubbo:application name="dubbo-consumer"/> <dubbo:registry protocol="zookeeper" address="192.168.88.171:2181,192.168.88.172:2181,192.168.88.173:2181" /> </beans>
applicationContext-service.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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 扫描bean对象 --> <context:component-scan base-package="com.bobo.service"/> </beans>
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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 包的扫描器主要是扫描@controller --> <context:component-scan base-package="com.bobo.controller" /> <!-- 注册两个新对象 主要是为了来处理springmvc中的其他anntation 如:@requestmapping --> <mvc:annotation-driven /> <!-- 视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- jsp所在的前缀 --> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 配置静态资源映射 --> <mvc:resources location="/WEB-INF/css/" mapping="/css/**" /> <mvc:resources location="/WEB-INF/js/" mapping="/js/**" /> </beans>
web.xml
<?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_3_0.xsd" id="WebApp_ID" version="3.0"> <!-- 上下文参数,告诉Spring配置文件路径 --> <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> <!-- 配置springmvc --> <servlet> <servlet-name>springmvc</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> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>encoding</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>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
5.3.4 测试整合
访问测试: http://localhost:8082/index
能够访问说明整合成功~ 下篇介绍具体的业务实现