一、Mybatis
1、mybatis-config.xml
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<?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>
<!-- 外部引入db-->
<properties resource="db.properties"/>
<settings>
<!-- 配置日志文件-->
<!-- <setting name="logImpl" value="STDOUT_LOGGING"/>-->
<setting name="logImpl" value="log4j"/>
<!-- 开启A_NAME==>aName-->
<setting name="mapUnderscoreToCamelCase" valie="true"
</settings>
<!-- 减少类型-->
<typeAliases> <typeAlias type="com.wang.pojo.User" alias="User"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/wang/dao/UserMapper.xml"/>
</mappers>
</configuration>
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2、Mapper.xml
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<?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.wang.dao.UserDao">
<select id="getUserList" resultType="User">
select * from mybatis.user
</select>
</mapper>
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3、db.properties
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driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis
username=root
password=123456
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4、MybatisUtils工具类
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package com.wang.utils;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class MybatisUtils {
private static SqlSessionFactory sqlSessionFactory;
static {
InputStream inputStream = null;
try {
String resource = "mybatis-config.xml";
inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getsqlsession() {
return sqlSessionFactory.openSession();
}
}
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5、多对一AND多对一：
在Mapper.xml中配置
association 对象 多对一
collection 集合 一对多
从用参数解释：
- javaType java类型
- ofType 泛型约束类型
6、使用注解开发
可在接口中使用注解进行开发，省去Mapper.xml
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@Select("select * from mybatis.User")
List<User> getUserList();
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在mybatis-config.xml中配置
<mappers>
<mapper class="com.wang.Dao.UserMapper"
</mappers>
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7、自定义缓存：ehcache
8、mybatis 其他工具
mybatis Hepler：https://pagehelper.github.io/
二、MAVEN资源导出错误解决
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<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
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三、常用依赖导入
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<!--导入依赖-->
<dependencies>
<!-- mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.49</version>
</dependency>
<!-- mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<!-- junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
</dependency>
<!-- lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
<!-- servlet and jsp-->
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>servlet-api-2.5</artifactId>
<version>6.1.7</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
</dependency>
<!-- standard-->
<dependency>
<groupId>org.apache.karaf.assemblies.features</groupId>
<artifactId>standard</artifactId>
<version>2.4.4</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<!-- jstl-->
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>jstl-api</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>jstl-impl</artifactId>
<version>1.2</version>
</dependency>
<!-- fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.76</version>
</dependency>
<!--Log4j-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
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四、LOG4J
1、log4j.properties 配置文件
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<!--导入依赖-->
<dependencies>
<!-- mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.49</version>
</dependency>
<!-- mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<!-- junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
</dependency>
<!-- lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
<!-- servlet and jsp-->
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>servlet-api-2.5</artifactId>
<version>6.1.7</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
</dependency>
<!-- standard-->
<dependency>
<groupId>org.apache.karaf.assemblies.features</groupId>
<artifactId>standard</artifactId>
<version>2.4.4</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<!-- jstl-->
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>jstl-api</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>jstl-impl</artifactId>
<version>1.2</version>
</dependency>
<!-- fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.76</version>
</dependency>
<!--Log4j-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
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2、log4j 在mybatis-config.xml的配置
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<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
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3、使用场景
在具体类中引入
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Logger logger = Logger.getLogger(UserDaoTest.class);
logger.error();
logger.debug();
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好用的插件：
1、lombok
常用注解：
- @Data 自动生成geter seter
- @AllArgsConstructor 生成有参构造函数
- @NoArgsConstructor 生成无参构造函数
=“logImpl” value=“LOG4J”/>
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## 3、使用场景
- 在具体类中引入
```java
Logger logger = Logger.getLogger(UserDaoTest.class);
logger.error();
logger.debug();
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常用注解：
- @Data 自动生成geter seter
- @AllArgsConstructor 生成有参构造函数
- @NoArgsConstructor 生成无参构造函数
总结
本篇文章就到这里了，希望能够给大家带来帮助，也希望您能够能够多多关注快网idc的更多内容！
原文链接：https://blog.csdn.net/weixin_50738670/article/details/117933388
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