mysql读写分离之代码实现（3）
来源：互联网 发布：用网络盒子看电视直播 编辑：程序博客网 时间：2024/06/06 02:39
一、编码
1、DynamicDataSource.java
这个类是AbstractRoutingDataSource的子类，重写了determineCurrentLookupKey()方法，作用是返回需要切换的数据源的key。
具体代码如下：
package org.lxl.mr.common.datasourceSwitch;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DataSourceSwitcher.getDataSource();
}
}
2、DataSourceSwitcher.java
这个类提供了切换数据源的方法，具体代码如下：
package org.lxl.mr.common.datasourceSwitch;
import org.springframework.util.Assert;
public class DataSourceSwitcher {
@SuppressWarnings("rawtypes")
private static final ThreadLocal contextHolder = new ThreadLocal();
@SuppressWarnings("unchecked")
public static void setDataSource(String dataSource){
Assert.notNull(dataSource, "dataSource cannot bu null");
contextHolder.set(dataSource);
}
public static void setMaster(){
clearDataSource();
}
public static void setSlave(){
setDataSource("slave");
}
public static String getDataSource(){
return (String)contextHolder.get();
}
public static void clearDataSource(){
contextHolder.remove();
}
}
3、DataSourceAdvice
这个类的before方法是在Service方法前执行，通过方法名判断使用那个DataSource，并调用DataSourceSwitcher的相应方法进行切换；
afterThrowing方法是在异常发生时，切换到slave服务器。
具体代码如下：
package org.lxl.mr.common.datasourceSwitch;
import java.lang.reflect.Method;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.ThrowsAdvice;
public class DataSourceAdvice implements MethodBeforeAdvice, ThrowsAdvice {
private static final Logger logger = LoggerFactory.getLogger(DataSourceAdvice.class);
@Override
public void before(Method method, Object[] args, Object target) throws Throwable {
logger.info("切入点："+target.getClass().getName()+"类中"+method.getName()+"方法");
if(method.getName().startsWith("add")
|| method.getName().startsWith("create")
|| method.getName().startsWith("save")
|| method.getName().startsWith("update")
|| method.getName().startsWith("delete")
|| method.getName().startsWith("remove")
|| method.getName().startsWith("register")){
logger.info("切换到：master");
DataSourceSwitcher.setMaster();
}else{
logger.info("切换到：slave");
DataSourceSwitcher.setSlave();
}
}
//抛出Exception之后被调用
public void afterThrowing(Method method,Object[] args,Object target,Exception ex) throws Throwable{
DataSourceSwitcher.setSlave();
logger.info("出现异常，切换到：slave");
}
}
二、配置
1、jdbc.properties
master.jdbc.driverClassName=com.mysql.jdbc.Driver
master.jdbc.url=jdbc:mysql://60.60.61.244:3306/mr?useUnicode=true&characterEncoding=utf-8&useOldAliasMetadataBehavior=true
master.jdbc.username=mr_master
master.jdbc.password=mrmaster123
slave.jdbc.driverClassName=com.mysql.jdbc.Driver
slave.jdbc.url=jdbc:mysql://60.60.61.245:3306/mr?useUnicode=true&characterEncoding=utf-8&useOldAliasMetadataBehavior=true
slave.jdbc.username=mr_slave
slave.jdbc.password=mrslave123
jdbc.dialect=org.hibernate.dialect.MySQLDialect
2、application.xml
在spring的主配置文件applicationContent.xml(用STS创建工程是root-context.xml)中，配置如下内容：
<!-- 加载properties配置文件 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:/jdbc.properties</value>
</list>
</property>
</bean>
<!-- 配置连接池 -->
<bean id="parentDataSource" class="org.apache.commons.dbcp.BasicDataSource">
</bean>
<!-- 主数据源 -->
<bean id="masterDataSource" parent="parentDataSource">
<property name="driverClassName" value="${master.jdbc.driverClassName}"/>
<property name="url" value="${master.jdbc.url}"/>
<property name="username" value="${master.jdbc.username}"/>
<property name="password" value="${master.jdbc.password}"/>
</bean>
<!-- 从数据源 -->
<bean id="slaveDataSource" parent="parentDataSource">
<property name="driverClassName" value="${slave.jdbc.driverClassName}"/>
<property name="url" value="${slave.jdbc.url}"/>
<property name="username" value="${slave.jdbc.username}"/>
<property name="password" value="${slave.jdbc.password}"/>
</bean>
<!-- 动态数据源 -->
<bean id="dataSource" class="org.lxl.mr.common.datasourceSwitch.DynamicDataSource">
<property name="targetDataSources">
<map key-type="java.lang.String">
<entry key="slave" value-ref="slaveDataSource"/>
</map>
</property>
<property name="defaultTargetDataSource" ref="masterDataSource"/>
</bean>
<!-- <bean id="dataSource" parent="parentDataSource">
<property name="driverClassName" value="${master.jdbc.driverClassName}"/>
<property name="url" value="${master.jdbc.url}"/>
<property name="username" value="${master.jdbc.username}"/>
<property name="password" value="${master.jdbc.password}"/>
</bean> -->
<!-- 配置sessionFactory -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="org.lxl.mr.pojo"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${jdbc.dialect}</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<!-- 切换数据源 -->
<bean id="dataSourceAdvice" class="org.lxl.mr.common.datasourceSwitch.DataSourceAdvice"/>
<aop:config>
<aop:advisor
pointcut="execution(* org.lxl.mr.service..*Service.*(..))"
advice-ref="dataSourceAdvice"/>
<aop:advisor
pointcut="execution(* org.lxl.mr.service..*ServiceImpl.*(..))"
advice-ref="dataSourceAdvice"/>
</aop:config>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref bean="sessionFactory"/>
</property>
</bean>
<!-- 配置事务的传播特性 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 对增、删、改方法进行事务支持 -->
<tx:method name="add*" propagation="REQUIRED"/>
<tx:method name="create*" propagation="REQUIRED"/>
<tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="edit*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
<tx:method name="delete*" propagation="REQUIRED"/>
<tx:method name="remove*" propagation="REQUIRED"/>
<tx:method name="register*" propagation="REQUIRED"/>
<!-- 对查找方法进行只读事务 -->
<tx:method name="loadByUsername*" propagation="SUPPORTS" read-only="true"/>
<!-- 对其它方法进行只读事务 -->
<tx:method name="*" propagation="SUPPORTS" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 哪些类的哪些方法参与事务 -->
<aop:config>
<aop:advisor
pointcut="execution(* org.lxl.mr.service..*Service.*(..))"
advice-ref="txAdvice"/>
<aop:advisor
pointcut="execution(* org.lxl.mr.service..*ServiceImpl.*(..))"
advice-ref="txAdvice"/>
</aop:config>
<!-- 配置hibernateTemplate -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"/>
<property name="flushMode" value="1"/>
<property name="cacheQueries" value="true"/>
</bean>
</beans>
3、log4j.xml
log4j要放在classpath下，具体配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<!-- Appenders -->
<appender name="console" class="org.apache.log4j.ConsoleAppender">
<param name="Target" value="System.out" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%-5p: %c - %m%n" />
</layout>
</appender>
<!-- Application Loggers -->
<logger name="org.lxl.mr">
<level value="info" />
</logger>
<!-- 3rdparty Loggers -->
<logger name="org.springframework.core">
<level value="info" />
</logger>
<logger name="org.springframework.beans">
<level value="info" />
</logger>
<logger name="org.springframework.context">
<level value="info" />
</logger>
<logger name="org.springframework.web">
<level value="info" />
</logger>
<!-- Root Logger -->
<root>
<priority value="warn" />
<appender-ref ref="console" />
</root>
</log4j:configuration>
PS：这里的配置是读写分离的最核心的配置，如果使用SpringMVC或者集成Struts2等还需要其它的配置，这些与本文内容无关，就没过多的叙述。
本文中的程序开发环境是：
IDE工具：STS
工程类型：Spring MVC Project
框架：spring+springmvc+hibernate
版本工具：maven3.2.1
附录：pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.lxl</groupId>
<artifactId>mr</artifactId>
<name>myRestaurant</name>
<packaging>war</packaging>
<version>1.0.0-BUILD-SNAPSHOT</version>
<properties>
<java-version>1.6</java-version>
<org.springframework-version>3.1.1.RELEASE</org.springframework-version>
<org.aspectj-version>1.6.10</org.aspectj-version>
<org.slf4j-version>1.6.6</org.slf4j-version>
<!-- Hibernate /JPA -->
<hibernate.groupId>org.hibernate</hibernate.groupId>
<hibernate.version>3.5.5-Final</hibernate.version>
</properties>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<!-- AspectJ -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${org.aspectj-version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>${org.aspectj-version}</version>
</dependency>
<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j-version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${org.slf4j-version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j-version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
<exclusions>
<exclusion>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
</exclusion>
<exclusion>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jdmk</groupId>
<artifactId>jmxtools</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jmx</groupId>
<artifactId>jmxri</artifactId>
</exclusion>
</exclusions>
<scope>runtime</scope>
</dependency>
<!-- @Inject -->
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>${hibernate.groupId}</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>${hibernate.groupId}</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>${hibernate.groupId}</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>${hibernate.groupId}</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.1.0.Final</version>
</dependency>
<!-- 验证框架 -->
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.12.1.GA</version>
</dependency>
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.2</version>
</dependency>
<!-- mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.3</version>
</dependency>
<!-- utils begin -->
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>commons-configuration</groupId>
<artifactId>commons-configuration</artifactId>
<version>1.8</version>
</dependency>
<!-- Test -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<additionalProjectnatures>
<projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>
</additionalProjectnatures>
<additionalBuildcommands>
<buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>
</additionalBuildcommands>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArgument>-Xlint:all</compilerArgument>
<showWarnings>true</showWarnings>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>org.test.int1.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
- mysql读写分离之代码实现（3）
- PHP代码实现MySQL读写分离
- mysql读写分离之代码分析与设计（2）
- mysql主从复制（三）之实现读写分离
- Mycat之Mysql读写分离的实现
- mysql读写分离（三）--- 读写分离实现
- 基于Atlas实现mysql读写分离（2）--读写分离
- MYSQL实现读写分离
- mysql读写分离实现
- Mysql实现读写分离
- mysql读写分离（主从复制）实现
- mysql读写分离（使用Atlas实现）
- mysql读写分离（使用Atlas实现）
- mysql优化之四（读写分离）
- mysql+spring+mybatis实现数据库读写分离[代码配置]
- mysql+spring+mybatis实现数据库读写分离[代码配置]
- MYSQL主从配置以及客户端代码实现读写分离功能
- mysql+spring+mybatis实现数据库读写分离[代码配置]
- 设计模式(八)---中介者模式
- C#基础
- java基础第十二天——网络编程，反射
- [javase学习笔记]-5.4 数组常用操作（1）
- IOS UIWebView (API+JS交互)、WKWebView
- mysql读写分离之代码实现（3）
- RoboBinding探究三：网络请求实现
- Oracle存储过程中利用数组循环调用另一存储过程
- 凯恩斯归来，大堡礁畅游记
- android获取系统相关信息(后续更新)
- 分布式一致性Paxos算法学习笔记
- 查看Android签名信息
- 解决Android Studio代码提示快捷键冲突
- Intel CPU 地址空间总结
