思路:
1.基礎TestDao接口:定義增刪改查方法;
2.編寫HibernateBaseDao 實現TestDao
3.編寫MybatisDao 繼承TestDao
4.不同的業務邏輯持久化層 繼承不同的BaseDao,例如 想用mybatis 集成MybatisBaseDao,享用hibernate,繼承HibernateBaseDao
5.在業務路基層注入baseDao
基於mysql 數據庫
具體代碼實現:由於是測試,所以結構上有點亂....
項目結構:
2.POM:
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.wj</groupId>
<artifactId>memory</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<springVersion>4.2.9.RELEASE</springVersion>
<slf4j.version>1.7.7</slf4j.version>
<hibernateVersion>5.0.7.Final</hibernateVersion>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!-- 表示開發的時候引入,發佈的時候不會加載此包 -->
<scope>test</scope>
</dependency>
<!-- spring核心包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${springVersion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springVersion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${springVersion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${springVersion}</version>
</dependency>
<!-- spring web + spring MVC-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${springVersion}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${springVersion}</version>
</dependency>
<!-- hibernate配置-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernateVersion}</version>
</dependency>
<!-- DataBase數據庫連接 mysql包-->
<!-- 添加對數據庫的支持 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.8-dmr</version>
</dependency>
<!-- 添加對數據源的支持 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- DAO框架:mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<!-- JSTL標籤類 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1-b08</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 日誌文件管理包 -->
<!-- log start -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.0.13</version>
</dependency>
<!-- 格式化對象,方便輸出日誌 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- log end -->
<!-- 映入JSON -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.5.0</version>
</dependency>
<!-- 上傳組件包 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
<!--http 請求-->
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>3.6.0</version>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
</dependency>
<!--微信-->
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.3</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.4.5.v20170502</version>
<configuration>
<scanIntervalSeconds>10</scanIntervalSeconds>
<httpConnector>
<port>8080</port>
</httpConnector>
<webApp>
<contextPath>/</contextPath>
</webApp>
</configuration>
</plugin>
</plugins>
</build>
</project>
3.配置文件
mybatis-config.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>
<!-- mybatis全局設置 -->
<settings>
<!--使用數據庫自增id-->
<setting name="useGeneratedKeys" value="true" />
<setting name="useColumnLabel" value="true" />
<!-- 開啓駝峯命名規範-->
<setting name="mapUnderscoreToCamelCase" value="true" />
</settings>
</configuration>
spring.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:c="http://www.springframework.org/schema/c" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 自動掃描 -->
<context:component-scan base-package="net.memoryProject">
<!-- 掃描時跳過 @Controller 註解的JAVA類(控制器) -->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--********************************************配置hibernate********************************************-->
<!--掃描配置文件(這裏指向的是之前配置的那個config.properties)-->
<context:property-placeholder location="classpath:db.properties" />
<!--配置數據源-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="driverClass" value="${jdbc.driver}" /> <!--數據庫連接驅動-->
<property name="jdbcUrl" value="${jdbc.url}" /> <!--數據庫地址-->
<property name="user" value="${jdbc.username}" /> <!--用戶名-->
<property name="password" value="${jdbc.password}" /> <!--密碼-->
<!-- 設置數據庫連接池的最大連接數 -->
<property name="maxPoolSize">
<value>1000</value>
</property>
<!-- 設置數據庫連接池的最小連接數 -->
<property name="minPoolSize">
<value>20</value>
</property>
<!-- 設置數據庫連接池的初始化連接數 -->
<property name="initialPoolSize">
<value>30</value>
</property>
<!-- 設置數據庫連接池的連接最大空閒時間 -->
<property name="maxIdleTime">
<value>20</value>
</property>
<!-- c3p0緩存Statement的數量數 -->
<property name="maxStatements">
<value>50</value>
</property>
<!-- 當連接池裏面的連接用完的時候,C3P0一下獲取新的連接數 -->
<property name="acquireIncrement">
<value>20</value>
</property>
</bean>
<!--配置session工廠-->
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="net.memoryProject.entity" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop> <!--hibernate根據實體自動生成數據庫表-->
<prop key="hibernate.dialect">${hibernate.dialect}</prop> <!--指定數據庫方言-->
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop> <!--在控制檯顯示執行的數據庫操作語句-->
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop><!--在控制檯顯示執行的數據哭操作語句(格式)-->
<prop key="hibernate.autoReconnect">true</prop><!--配置mysql是的時候,如果超過8小時數據庫沒有操作,會自動斷開連接,可以配置-->
<prop key="hibernate.enable_lazy_load_no_trans">true</prop>
<prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate5.SpringSessionContext</prop>
</props>
</property>
</bean>
<!-- 用註解來實現事物管理 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate5.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<!-- mybatis文件配置,掃描所有mapper文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="typeAliasesPackage" value="net.memoryProject.entity"/>
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>
<!-- spring與mybatis整合配置,掃描所有dao,指定的映射器類是接口,接口方法可以用註解來指定 SQL 語句,但是 MyBatis 的映射器 XML 文件也可以用。 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
p:basePackage="net.memoryProject.mybatisDao"
p:sqlSessionFactoryBeanName="sqlSessionFactory"/>
</beans>
spring-mvc.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" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<mvc:annotation-driven>
<mvc:message-converters register-defaults="false"> <!-- 不使用默認配置 -->
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter" />
<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
<bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter" />
<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter" >
<property name="supportedMediaTypes"> <!-- 支持的媒體類型 -->
<list>
<value>text/html;charset=UTF-8</value><!-- 順序不要寫反了,否則IE會出現下載提示 -->
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 自動掃描該包,使SpringMVC認爲包下用了@controller註解的類是控制器 -->
<context:component-scan base-package="net.memoryProject.controller"/>
<!-- 定義跳轉的文件的前後綴 ,視圖模式配置-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 這裏的配置我的理解是自動給後面action的方法return的字符串加上前綴和後綴,變成一個 可用的url地址 -->
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 配置文件上傳,如果沒有使用文件上傳可以不用配置,當然如果不配,那麼配置文件中也不必引入上傳組件包 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 默認編碼 -->
<property name="defaultEncoding" value="utf-8"/>
<!-- 文件大小最大值 -->
<property name="maxUploadSize" value="10485760000"/>
<!-- 內存中的最大值 -->
<property name="maxInMemorySize" value="40960"/>
</bean>
</beans>
TestDao:
package net.memoryProject.dao.template;
import java.util.List;
/**
* @Author: wj
* @Date: 2018/12/11 8:44
* @Version 1.0
*/
public interface TestDao<T> {
public List<T> findAll();
}
hibernateBaseDao:
package net.memoryProject.dao.template;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate5.HibernateTemplate;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
/**
* @Author: wj
* @Date: 2018/12/11 8:53
* @Version 1.0
*/
public class HibernateBaseDao<T>implements TestDao<T> {
@Autowired
private HibernateTemplate hibernateTemplate;
private Class tclazz;
private String simpleName;
public HibernateBaseDao() {
//得到當前運行類的類型,此方法是從Object繼承而來所以
//不論是this.getClass()還是super.getClass()返回的都是當前運行類
Class clazz = this.getClass();
//第二部找到當前運行類的父類的參數化類型
Type type = clazz.getGenericSuperclass();
//Type 強轉成其子接口ParameterizedType;
ParameterizedType parameterizedType = (ParameterizedType) type;
//三 、得到參數化類型的實際類型參數<Customer>
Type[] types = parameterizedType.getActualTypeArguments();
//Class 是 Type的一個實現類所以可以使用多態獲得Class
Class pclazz = (Class) types[0];
this.tclazz = pclazz;
this.simpleName = pclazz.getSimpleName();
}
public List<T> findAll() {
return (List<T>) hibernateTemplate.find("from "+tclazz.getSimpleName());
}
}
mybatisBaseDao:
package net.memoryProject.mybatisDao;
import net.memoryProject.dao.template.TestDao;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
* @Author: wj
* @Date: 2018/12/11 8:52
* @Version 1.0
*/
public interface MybatisBaseDao<T> extends TestDao<T> {
}
兩種UserDao:
1. UserDao接口繼承MybatisBaseDao 用於訪問mybatis
package net.memoryProject.mybatisDao;
import net.memoryProject.entity.User;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
* @Author: wj
* @Date: 2018/12/10 16:15
* @Version 1.0
*/
public interface UserDao extends MybatisBaseDao<User> {
List<User> findAll();
}
2,UserDao類繼承HibernateBaseDao 接口,走hibernate:
這裏存在Ioc容器中有同名userDao 問題 所以註解改了個名字
package net.memoryProject.dao;
import net.memoryProject.dao.template.BaseDao;
import net.memoryProject.dao.template.HibernateBaseDao;
import net.memoryProject.entity.User;
import org.springframework.stereotype.Repository;
/**
* @author wj
* @date 2018/6/29 13:32
*/
@Repository("userDaohibernate")
public class UserDao extends HibernateBaseDao<User> {
}
業務層調用: setBaseDao 傳入不同的bean實例,可以實現調用hibernate 或者 mybatis
注掉的方法也可以看看
package net.memoryProject.service.imp;
import net.memoryProject.dao.UserDao;
import net.memoryProject.dao.template.TestDao;
import net.memoryProject.entity.User;
import net.memoryProject.mybatisDao.MybatisBaseDao;
import net.memoryProject.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.ArrayList;
import java.util.List;
/**
* @author wj
* @date 2018/6/29 13:31
*/
@Transactional(rollbackFor = Exception.class)
@Service
public class UserServiceImpl implements UserService{
/* @Autowired
@Qualifier("userDaohibernate")
private UserDao userDao;
@Autowired
private net.memoryProject.mybatisDao.UserDao baseDao;
*/
private TestDao baseDao;
@Autowired
public void setTestDao(net.memoryProject.mybatisDao.UserDao dao) {
this.baseDao = dao;
}
public List<User> searchList() {
List<User> userh = baseDao.findAll();
//List<User> userm = baseDao.userList();
List<User> users = new ArrayList<User>();
users.add(userh.get(0));
//users.add(userm.get(0));
return users;
}
}