Fulongのblog

SSM分模块整合

2018/08/06 SpringMVC 共 9316 字，约 27 分钟

mybatis

目录结构

导包

包括 mybatis, mysql-connector-java

<?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>groupId</groupId>
    <artifactId>ssm2</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.8-dmr</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.ibatis</groupId>
            <artifactId>ibatis-core</artifactId>
            <version>3.0</version>
        </dependency>
    </dependencies>

</project>

写 db.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
jdbc.username=root
jdbc.password=123456

写 mybatis-config.xml 文件

写 mybatis-config.xml 配置文件 里面包含数据的连接信息和映射文件(这里的连接信息也可以删掉 后面会写一个连接数据库的资源文件 在 spring 里面引用)

<?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>
    <properties resource="db.properties">
        <!--properties中还可以配置一些属性名和属性值  -->
        <!-- <property name="jdbc.driver" value=""/> -->
    </properties>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
                <!--<property name="driver" value="com.mysql.jdbc.Driver"/>-->
                <!--<property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>-->
                <!--<property name="username" value="root"/>-->
                <!--<property name="password" value="123456"/>-->
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mapper/UserMapper.xml"/>
    </mappers>

</configuration>

实体类和对应的映射文件

pojo 及对应的*Mapper.xml

比如 User bean 类，及 UserMapper.xml

User

package com.mfl.ssm.pojo;

public class User {
    private Integer id;
    private String name;
    private int age;
    public User(){

    }
    public User(String name, int age){
        this.name=name;
        this.age=age;
    }
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

interface IUserDao

package com.mfl.ssm.dao;

import com.mfl.ssm.pojo.User;
import org.apache.ibatis.annotations.Param;

import java.util.List;
public interface IUserDao {
    public void insert(User user);
    public void update(User user);
    public User selectOne(int id);
    public List<User> selectList(int age);
    public List<User> selectAll();
    public List<User> selectUserByBetweenAandB(@Param("a") int a1, @Param("b") int b1);
}

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">

<mapper namespace="com.mfl.ssm.dao.IUserDao">
    <insert id="insert">
        insert into users(name,age) values (#{name},#{age})
    </insert>
    <update id="update" >
        update users set name=#{name}, age=#{age} where id=#{id}
    </update>
    <select id="selectOne" parameterType="int" resultType="com.mfl.ssm.pojo.User">
        select * from users where id=#{id1}
    </select>
    <select id="selectList" parameterType="int" resultType="com.mfl.ssm.pojo.User">
        select * from users where age=#{age}
    </select>
    <select id="selectAll" resultType="com.mfl.ssm.pojo.User">
        select * from users
    </select>
    <select id="selectUserByBetweenAandB" resultType="com.mfl.ssm.pojo.User">
        select * from users where age between #{a} and #{b1}
    </select>

</mapper>

测试

引入 junit

import com.mfl.ssm.dao.IUserDao;
import com.mfl.ssm.pojo.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;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;

public class mybatis {
    @Test
    public void test1(){

        String resource = "mybatis-config.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        SqlSessionFactory sqlSessionFactory =
                new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession=sqlSessionFactory.openSession();
        IUserDao iUserDao=sqlSession.getMapper(IUserDao.class);
        System.out.println(IUserDao.class);

    }

    @Test
    public void test2(){
        String resource = "mybatis-config.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        SqlSessionFactory sqlSessionFactory =
                new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession=sqlSessionFactory.openSession();
        IUserDao iUserDao=sqlSession.getMapper(IUserDao.class);
        System.out.println(IUserDao.class);
        for(User user:iUserDao.selectAll()){
            System.out.println(user);
        }
        sqlSession.commit();
        sqlSession.close();
    }

}

spring

引入 Stirng 对于连接池 c3p0 的支持 Spring-jdbc4，引入 mybatis 对于 Spring 的依赖 mybatis-spring1,引入 c3p0 连接池的依赖

创建 spring-mybatis.xml

配置扫描器

<context:component-scan base-package="com.mfl.ssm.dao,com.mfl.ssm.pojo"></context:component-scan>

并加注解 bean

包括@Repository 和@Service

@Repository
public class User {

引入连接数据库的资源文件 db.properties

    <!-- 引入jdbc配置文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="db.properties" />
    </bean>

配置 c3p0 数据源（class:combopooleDataSource）


    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="initialPoolSize" value="5"></property>
        <property name="maxPoolSize" value="20"></property>
    </bean>

配置 sqlSessionFactor

    <!-- 配置sqlSessionFactor -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="mapper/*Mapper.xml"/>
    </bean>

DAO 接口所在包名

    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.mfl.ssm.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

在 web.xml 中通过 listener 加载 spring

    <!-- Spring和mybatis的配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-mybatis.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

test

import com.mfl.ssm.dao.IUserDao;
import com.mfl.ssm.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class spring {
    @Test
    public void test1(){

        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("spring-mybatis.xml");
        IUserDao iUserDao=(IUserDao)applicationContext.getBean("iUserDao");
        System.out.println(iUserDao.getClass());
    }
    @Test
    public void test2(){
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("spring-mybatis.xml");
        User user=(User)applicationContext.getBean("user");
        System.out.println(user);
    }
}

spring MVC

spring-mvc.xml

配置扫描器

spring-mvc.xml

    <context:component-scan base-package="com.mfl.ssm.controller"></context:component-scan>

视图解析器

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/jsp/"></property>
            <property name="suffix" value=".jsp"></property>
    </bean>

在 web.xml 中通过 servlet 加载 springmvc

    <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

Controller 类

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