IDEA maven整合spring框架与Mybatis框架 实现登录，查询功能

1，创建Maven项目

整体的目录结构：

添加依赖

<?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.example</groupId>
    <artifactId>untitled4</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>


    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.15.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.16.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.2.16.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.26</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.1.RELEASE</version>
            <scope>test</scope>
        </dependency>

    </dependencies>


</project>

写配置文件applicationContext.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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--声明注解配置-->
    <context:annotation-config></context:annotation-config>
    <!--扫描包-->
    <context:component-scan base-package="lbs"></context:component-scan>
    <!--1.加载数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties" system-properties-mode="NEVER"></context:property-placeholder>
    <!--2.配置数据源-->
    <bean id="dataSource"  class="com.alibaba.druid.pool.DruidDataSource">
           <property name="driverClassName" value="${driver}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${username}"></property>
        <property name="password" value="${password}"></property>
    </bean>
    <!--3.创建SqlsessionFactory-->
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--数据源配置-->
        <property name="dataSource" ref="dataSource"></property>
        <!--配置mapper文件的路径-->
        <property name="mapperLocations" value="classpath:mappers/*Mapper.xml"> </property>
        <!--配置需要定义别名的实体类的包-->
        <property name="typeAliasesPackage" value="lbs.Pojo"></property>
    </bean>

    <!--4.配置mapper-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <property name="basePackage" value="lbs.mapper"></property> </bean>
</beans>

创建pojo类
user

package lbs.Pojo;


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private int id;
    private String username;
    private String password;
    private int age;
    private String address;
}

Mapper接口
实现一个登录，查询所有的功能接口。

package lbs.mapper;

import lbs.Pojo.User;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface UserMapper {

    public User login(@Param("username") String username, @Param("password") String password);

    public List<User> showUser();

}

映射文件：

<?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: 所需实现的接口的全限定名(从包名下的类名)
-->
<mapper namespace="lbs.mapper.UserMapper">
    <select id="login" resultType="user">
        select *from user where username=#{username} and password=#{password}
    </select>
    <select id="showUser" resultType="user">
        select *from user
    </select>
</mapper>

db数据文件

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mydb
username=root
password=root

最后的测试类
TestUser

package lbs;

import lbs.Pojo.User;
import lbs.mapper.UserMapper;
import lombok.val;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;
import java.util.List;
//1. 通过@RunWith 声明当前测试类位于Spring容器环境(被Spring容器管理)
@RunWith(SpringJUnit4ClassRunner.class)
//2. 通过@ContextConfiguration 声明当前测试环境的Spring容器运行时加载配置文件
@ContextConfiguration("classpath:applicationContext.xml")
public class TestUser {

    @Resource
    private UserMapper userMapper;
    @Test
    public void login(){
        User admin = userMapper.login("admin","123");
        if (admin!=null){
            System.out.println("成功");
        }else {
            System.out.println("失败");
        }
    }
    @Test
    public void showUser(){
        List<User> show = userMapper.showUser();
        for (User u:show){
            System.out.println(u.getUsername()+"t"+u.getAddress());
        }

    }
}

log4日志文件

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %mn

# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %mn

照例一句歌词：

最后

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