使用IDEA Maven搭建mybatis 和遇到的问题

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项目目录结构

数据库

drop table if exists tb_user;

create table tb_user (
  id int(11) primary key auto_increment,
	name varchar(18) default null,
	sex char(2) default null,
	age int(11) default null
);

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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.fkit</groupId>
    <artifactId>Hellobatis</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13-beta-2</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>Hellobatis</finalName>
        <resources>
            <resource>
                <directory>${basedir}/src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>${basedir}/src/main/resources</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

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">
  <!--  XML 配置文件包含对 MyBatis 系统的核心设置 -->
<configuration>
	<!-- 指定 MyBatis 所用日志的具体实现 -->
	<settings>
		<setting name="logImpl" value="LOG4J"/>
	</settings>
	<environments default="mysql">
	<!-- 环境配置，即连接的数据库。 -->
    <environment id="mysql">
    <!--  指定事务管理类型，type="JDBC"指直接简单使用了JDBC的提交和回滚设置 -->
      <transactionManager type="JDBC"/>
      <!--  dataSource指数据源配置，POOLED是JDBC连接对象的数据源连接池的实现。 -->
      <dataSource type="POOLED">
        <property name="driver" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&amp;characterEncoding=UTF-8&amp;useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
      </dataSource>
    </environment>
  </environments>
  <!-- mappers告诉了MyBatis去哪里找持久化类的映射文件 -->
  <mappers>
  	<mapper resource="org/fkit/mapper/UserMapper.xml"/>
  </mappers>
</configuration>

log4j.properties

# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.org.fkit.mapper.UserMapper=DEBUG
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] %m%n

UserMapper.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">
<!-- namespace指用户自定义的命名空间。 -->
<mapper namespace="org.fkit.mapper.UserMapper">

<!-- 
	id="save"是唯一的标示符
	parameterType属性指明插入时使用的参数类型
	useGeneratedKeys="true"表示使用数据库的自动增长策略
 -->
  <insert id="save" parameterType="org.fkit.domain.User" useGeneratedKeys="true">
  	INSERT INTO TB_USER(name,sex,age) 
  	VALUES(#{name},#{sex},#{age})
  </insert>
  

</mapper>

User.java

package org.fkit.domain;

import java.io.Serializable;


public class User implements Serializable{

	private static final long serialVersionUID = 1L;
	
	// 用户标识
	private Integer id;
	// 用户姓名
	private String name;
	// 用户性别
	private String sex;
	// 用户年龄
	private Integer age;
	
	// 无参数构造器
	public User() {
		super();
	}
	// 有参数构造器
	public User( String name, String sex, Integer age) {
		super();
		this.name = name;
		this.sex = sex;
		this.age = age;
	}
	 // setter和getter方法
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", age="
				+ age + "]";
	}
	
	

}

MyBatisTest.java

package test;

import java.io.InputStream;

import org.fkit.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;


public class MyBatisTest {

	public static void main(String[] args) {
		SqlSession sqlSession = null;
		try (
				InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
			){
			SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder()
					.build(is);
			sqlSession = sqlSessionFactory.openSession();
			User user = new User("adin", "女", 26);
			sqlSession.insert("org.fkit.mapper.UserMapper.save", user);
			sqlSession.commit();
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				if(sqlSession != null) sqlSession.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		
	}
}

运行结果

遇到的问题

1 . Log4j提示类找不到
原因:不明,在External Libraries中没有Log4j类

解决:

<dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
            <type>bundle</type>
        </dependency>

在pom.xml依赖中去掉

<type>bundle</type>

后正常,External Libraries出现有Log4j类

2 . Idea中 idea language level始终是1.5的问题
原因: baidu了下，发现问题出现在了pom.xml文件的配置上，pom没有相关配置时，maven项目默认是会选择1.5版本的，所以在配置文件中，加上下面的代码即可。
解决:

<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>UTF-8</encoding>
            </configuration>
        </plugin>
    </plugins>
 
</build>

解决找不到配置文件

<build>
        <finalName>Hellobatis</finalName>
        <resources>
            <resource>
                <directory>${basedir}/src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>${basedir}/src/main/resources</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

参考:
Idea搭建maven mybatis工程，并实现最简单的数据库连接
Idea中 idea language level始终是1.5的问题
Spring + MyBatis 企业停用实战 (第二版 ) - 疯狂软件 编著