spring整合mybatis

spring中整合mybatis

一先添加spring框架

1.创建一个maven项目

2.在pom.xml中添加spring jar包



  org.springframework
  spring-context
  4.1.3.RELEASE


  org.springframework
  spring-core
  4.1.3.RELEASE



  org.springframework
  spring-beans
  4.1.3.RELEASE


  org.springframework
  spring-context-support
  4.1.3.RELEASE

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3.创建基本mvc结构

pojo层:

Items类

package com.test.pojo;

import java.util.Date;

public class Items {
       private int id;
       private String name;
       private float price;
       private String detail;
       private String pic;
       private Date createtime;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }

    public String getPic() {
        return pic;
    }

    public void setPic(String pic) {
        this.pic = pic;
    }

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }

    @Override
    public String toString() {
        return "Items{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", detail='" + detail + '\'' +
                ", pic='" + pic + '\'' +
                ", createtime=" + createtime +
                '}';
    }
}
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dao层

接口 IItemsDao

package com.test.dao;

import com.test.pojo.Items;

import java.util.List;

public interface IItemsDao {


    public List selectItems();
}
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实现类 ItemsDao

package com.test.dao.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;

import org.springframework.stereotype.Component;

import java.io.InputStream;
import java.util.List;


public class ItemsDao implements IItemsDao {

    public ItemsDao()
    {

    }
    public List selectItems()
    {
          return null;
    }
}
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service层

接口:IItemsService

package com.test.service;

import com.test.pojo.Items;

import java.util.List;

public interface IItemsService {

    public List selectItems();
}
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实现类:ItemsService

package com.test.service.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;
import com.test.service.IItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


public class ItemsService implements IItemsService {

    
    private IItemsDao itemsDao;


    public List selectItems()
    {
        return itemsDao.selectItems();
    }
}
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4.创建spring的配置文件

applicationContext-ioc.xml

5.在配置文件中添加注解扫描包

在mvc各层中添加注解

package com.test.dao.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;

import org.springframework.stereotype.Component;

import java.io.InputStream;
import java.util.List;

@Component
public class ItemsDao implements IItemsDao {

    public ItemsDao()
    {

    }
    public List selectItems()
    {
       return null;
    }
}
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@Service
public class ItemsService implements IItemsService {

    @Autowired
    private IItemsDao itemsDao;   
    


    public List selectItems()
    {
        return itemsDao.selectItems();
    }
}
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二.在spring中引入mybatis

1.导入mybatis jar包



  mysql
  mysql-connector-java
  5.1.37


  org.mybatis
  mybatis
  3.4.6


  com.mchange
  c3p0
  0.9.5.2


 
    
      log4j
      log4j
      1.2.17
    
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2.导入spring整合mybatis架包


  
      org.mybatis
      mybatis-spring
      1.3.0
    
 
      org.springframework
      spring-jdbc
      4.1.3.RELEASE
  
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3.创建mapper文件

4.创建mapper文件的代理接口

package com.test.mapper;

import com.test.pojo.Items;

import java.util.List;

public interface ItemsMapper {

    public List selectItems();


}
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5.创建mybatis配置文件

mybatis.xml文件

6. 创建db.properties文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123
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7. 修改applicationContext-ioc.xml文件

将之前在mybatis文件中配置的数据源交给spring来管理，并创建sqlSessionFactory对象

8.修改dao层

package com.test.dao.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.InputStream;
import java.util.List;

@Component
public class ItemsDao implements IItemsDao {
    
    @Autowired
    private SqlSessionFactory sqlSessionFactory;

    public ItemsDao()
    {
      
    }

    public List selectItems()
    {
        SqlSession sqlSession= sqlSessionFactory.openSession();

        ItemsMapper itemsMapper= sqlSession.getMapper(ItemsMapper.class);

        List itemsList= itemsMapper.selectItems();

        return itemsList;
    }
}

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9.在pom.xml文件中添加mapper.xml文件的路径

在build标签中添加

 
 
   
   src/main/java
   
     **/*.xml
   
   true
 
 
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10.测试

@Test
public void fun()
{
    ClassPathXmlApplicationContext classPathXmlApplicationContext=new ClassPathXmlApplicationContext("/applicationContext-ioc.xml");

    IItemsService itemsService= classPathXmlApplicationContext.getBean("itemsService",IItemsService.class);

     System.out.println(itemsService.selectItems());
}
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三给mapper接口创建代理，替代原dao层的功能

1.在applicationContext-ioc.xml文件中添加

修改service代码

将之前的

@Autowired
private IItemsDao itemsDao;
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修改为

@Autowired
private ItemsMapper itemsMapper;
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完整代码如下

package com.test.service.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;
import com.test.service.IItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class ItemsService implements IItemsService {


    @Autowired
    private ItemsMapper itemsMapper;

    public List selectItems()
    {
        return itemsMapper.selectItems();
    }
}
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原来的dao层可以删除
测试代码不变

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原文地址：https://blog.csdn.net/daimenglaoshi/article/details/127581046