为什么在maven项目中无法找到测试类

 测试类 

package com.zhaoxin;

import com.zhaoxin.dao.UserDao;
import com.zhaoxin.pojo.User;
import com.zhaoxin.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

/**
 * @program: maven_project
 * @description:
 * @author: ZhaoXin
 * @create: 2021-05-31 19:20
 **/
public class TestMybatis {
    @Test
    public void testFindAll(){
        // 1-4 获取SqlSession
        SqlSession sqlSession = MybatisUtils.getSqlSession();

        // 5. 获取代理对象
        UserDao userDao = sqlSession.getMapper(UserDao.class);

        // 6. 执行findAll方法
        List<User> userList = userDao.findAll();

        //  7. 处理结果
        for (User user : userList) {
            System.out.println(user);
        }

        // 8. 关闭资源
        MybatisUtils.commitAndClose(sqlSession);
    }
}

文件结构 

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>com.zhaoxin</groupId>
    <artifactId>mybatis_practice</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!--引入lombok的依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--mybatis的依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        
    </dependencies>

</project>

主配置文件 

<?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>
    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="username" value="root"/>
                <property name="password" value="z77"/>
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///mybatis_day?characterEncoding=utf8"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com\zhaoxin\dao\UserDao.xml"></mapper>
    </mappers>
</configuration>

<?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.zhaoxin.dao.UserDao">
    <select id="findAll" resultType="com.zhaoxin.pojo.User">
        select * from t_user
    </select>
</mapper>

 target文件

可以试试使用junit4,单元测试来试试

你不觉得你的数据库url链接有问题吗

正确的应该是：jdbc:mysql://localhost:3306/mybatis_day?useUnicode=true&characterEncoding=utf8

测试类 

package com.zhaoxin;

import com.zhaoxin.dao.UserDao;
import com.zhaoxin.pojo.User;
import com.zhaoxin.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

/**
 * @program: maven_project
 * @description:
 * @author: ZhaoXin
 * @create: 2021-05-31 19:20
 **/
public class TestMybatis {
    @Test
    public void testFindAll(){
        // 1-4 获取SqlSession
        SqlSession sqlSession = MybatisUtils.getSqlSession();

        // 5. 获取代理对象
        UserDao userDao = sqlSession.getMapper(UserDao.class);

        // 6. 执行findAll方法
        List<User> userList = userDao.findAll();

        //  7. 处理结果
        for (User user : userList) {
            System.out.println(user);
        }

        // 8. 关闭资源
        MybatisUtils.commitAndClose(sqlSession);
    }
}

文件结构 

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>com.zhaoxin</groupId>
    <artifactId>mybatis_practice</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!--引入lombok的依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--mybatis的依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        
    </dependencies>

</project>

主配置文件 

<?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>
    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="username" value="root"/>
                <property name="password" value="z77"/>
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///mybatis_day?characterEncoding=utf8"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com\zhaoxin\dao\UserDao.xml"></mapper>
    </mappers>
</configuration>

<?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.zhaoxin.dao.UserDao">
    <select id="findAll" resultType="com.zhaoxin.pojo.User">
        select * from t_user
    </select>
</mapper>

 target文件