Spring整合Mybatis方式(MapperScannerConfigurer實現)
阿新 • • 發佈：2021-10-27
環境準備請看：https://www.cnblogs.com/SweetheartAndPeaches/p/15468527.html
資料庫準備
根據資料庫建立entity包放一個VoteUser類
VoteUser.java
package entity; import java.io.Serializable; import java.util.List; public class VoteUser implements Serializable{ private String userName; private String userPwd; private int userRank; private String userVote; private int userPower; private String applyVote; //一對多會存放一個關於問卷調查的List private List<Vote> vote; public List<Vote> getVote() { return vote; } public void setVote(List<Vote> vote) { this.vote = vote; } public VoteUser(String userName, String userPwd, int userRank, String userVote, int userPower, String applyVote) { super(); this.userName = userName; this.userPwd = userPwd; this.userRank = userRank; this.userVote = userVote; this.userPower = userPower; this.applyVote = applyVote; } public VoteUser() { super(); } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getUserPwd() { return userPwd; } public void setUserPwd(String userPwd) { this.userPwd = userPwd; } public int getUserRank() { return userRank; } public void setUserRank(int userRank) { this.userRank = userRank; } public String getUserVote() { return userVote; } public void setUserVote(String userVote) { this.userVote = userVote; } public int getUserPower() { return userPower; } public void setUserPower(int userPower) { this.userPower = userPower; } public String getApplyVote() { return applyVote; } public void setApplyVote(String applyVote) { this.applyVote = applyVote; } public VoteUser(String userName, String userPwd, int userRank) { super(); this.userName = userName; this.userPwd = userPwd; this.userRank = userRank; } @Override public String toString() { return "VoteUser [userName=" + userName + ", userPwd=" + userPwd + ", userRank=" + userRank + ", userVote=" + userVote + ", userPower=" + userPower + ", applyVote=" + applyVote + ", vote=" + vote + "]"; } }
兩個xml配置
ApplicationContent.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:aop="http://www.springframework.org/schema/aop" 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/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 "> <!-- 整合mybatis的envirement標籤 --> <!-- 配置資料來源 --> <!--這裡的org.apache.commons.dbcp.BasicDataSource類是jar包裡面的類 ，destroy-method定義資料庫關閉的方式--> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <!-- 引數就是自己的資料庫引數 --> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/survey?useUnicode=true&characterEncoding=utf8" /> <property name="username" value="root" /> <property name="password" value="747452" /> <property name="maxActive" value="10" /> <property name="maxIdle" value="5" /> </bean> <!-- 配置sqlSessionFactory，SqlSessionFactoryBean是用來產生sqlSessionFactory的 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 載入mybatis的全域性配置檔案，放在classpath下的mybatis資料夾中 --> <property name="configLocation" value="classpath:Mybatis-Config.xml" /> <!-- 載入資料來源，使用上面配置好的資料來源 --> <property name="dataSource" ref="dataSource" /> <!-- 註冊mepper.xml --> <property name="mapperLocations" value="classpath:dao/*.xml" /> </bean> <!-- 開啟掃描:方便我們注入 --> <context:component-scan base-package="*"></context:component-scan> <!-- 有個缺點當 mapper太多要一個一個寫會很麻煩 <bean id ="voteUserDao" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="mapperInterface" value="dao.VoteUserMapper"></property> <property name="sqlSessionFactory" ref="sqlSessionFactory"></property> </bean>--> <!-- 針對產生了通用型會批量生產 --> <!-- DAO介面所在包名，Spring會自動查詢其下的類 ,包下的類需要使用@MapperScan註解,否則容器注入會失敗，產生的是開頭小寫於xml同名的的bean --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="dao" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> </beans>
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> <!--開啟二級快取 --> <settings> <setting name="cacheEnabled" value="true"/> <setting name="useGeneratedKeys" value="true"/> </settings> </configuration>
建立dao包
（特別注意dao介面對應的xml名字需要相同MapperFactoryBean會找同名的xml）
VoteUserMapper.java
package dao;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.Param;
import entity.VoteUser;
public interface VoteUserDao {
//查詢所有
public abstract List<VoteUser> SelectAllVoteUser();
}
VoteUserMapper.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="dao.VoteUserDao">
<cache></cache>
<!--查詢所有 -->
<select id="SelectAllVoteUser" resultType="entity.VoteUser">
SELECT * FROM VOTEUSER
</select>
</mapper>
建立service包
VoteUserService.java
package service;
import java.util.List;
import entity.VoteUser;
public interface VoteUserService {
//查詢所有
public abstract List<VoteUser> SelectAllVoteUser();
}
建立serviceimpl包
VoteUserServiceImpl.java
package serviceimpl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import dao.VoteUserMapper;
import entity.VoteUser;
import service.VoteUserService;
@Service("voteUserService")
public class VoteUserServiceImpl implements VoteUserService{
@Autowired
//這裡的名字需要跟xml一樣（首字母小寫）
private VoteUserMapper voteUserMapper;
//還是需要set
public VoteUserMapper getVoteUserDao() {
return voteUserMapper;
}
public void setVoteUserDao(VoteUserMapper voteUserDao) {
this.voteUserMapper = voteUserDao;
}
@Override
public List<VoteUser> SelectAllVoteUser() {
return voteUserMapper.SelectAllVoteUser();
}
}
最後是測試包test
test01.java
package test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import entity.VoteUser;
import service.VoteUserService;
public class test01 {
public static void main(String[] args) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("ApplicationContent.xml");
VoteUserService voteUserService=(VoteUserService)applicationContext.getBean("voteUserService");
for (VoteUser user : voteUserService.SelectAllVoteUser()) {
System.out.println(user);
}
}
}