mybatis与spring集成和mybatis分页插件

1、Mybatis与spring集成

1、.导入pom依赖


1.1 添加spring相关依赖(5.0.2.RELEASE)
       spring-core
       spring-beans
       spring-context
       spring-orm
       spring-tx
       spring-aspects
       spring-web

   1.2 添加mybatis相关依赖
       mybatis核心:mybatis(3.4.5)
       Mybatis分页:pagehelper(5.1.2)

   1.3 spring整合mybatis(1.3.1)
       mybatis-spring

   1.4 添加dbcp2连接池
       commons-dbcp2(2.1.1)
       commons-pool2(2.4.3)

   1.5 添加日志配置(2.9.1)
       log4j-core
       log4j-api
       log4j-web

   1.6 其他
       junit(4.12)
       javax.servlet-api(4.0.0)
       lombok(1.18.2)

   注:使用mybatis-generator插件,pom文件添加支持  

文件如下




  4.0.0

  com.hyf
  ssm
  1.0-SNAPSHOT
  war

  ssm Maven Webapp
  
  http://www.example.com

  
    UTF-8
    1.8
    1.8
    3.7.0

    
    
    5.0.2.RELEASE
    
    3.4.5
    
    5.1.44
    
    5.1.2
    
    1.3.1
    
    2.1.1
    2.4.3
    
    2.9.1
    
    4.12
    4.0.0
    1.18.2
  


  
    
    
      org.springframework
      spring-context
      ${spring.version}
    
    
      org.springframework
      spring-orm
      ${spring.version}
    
    
      org.springframework
      spring-tx
      ${spring.version}
    
    
      org.springframework
      spring-aspects
      ${spring.version}
    
    
      org.springframework
      spring-web
      ${spring.version}
    
    
      org.springframework
      spring-test
      ${spring.version}
    

    
    
      org.mybatis
      mybatis
      ${mybatis.version}
    
    
    
      mysql
      mysql-connector-java
      ${mysql.version}
    
    
    
      com.github.pagehelper
      pagehelper
      ${pagehelper.version}
    

    
    
      org.mybatis
      mybatis-spring
      ${mybatis.spring.version}
    

    
    
      org.apache.commons
      commons-dbcp2
      ${commons.dbcp2.version}
    
    
      org.apache.commons
      commons-pool2
      ${commons.pool2.version}
    

    
    
    
      org.apache.logging.log4j
      log4j-core
      ${log4j2.version}
    
    
      org.apache.logging.log4j
      log4j-api
      ${log4j2.version}
    
    
    
      org.apache.logging.log4j
      log4j-web
      ${log4j2.version}
    

    
    
      junit
      junit
      ${junit.version}
      test
    
    
      javax.servlet
      javax.servlet-api
      ${servlet.version}
      provided
    
    
      org.projectlombok
      lombok
      ${lombok.version}
      provided
    
  

  
    ssm
    
      
      
        src/main/java
        
          **/*.xml
        
      
      
      
        src/main/resources
        
          jdbc.properties
          *.xml
        
      
    


    
      
        
          org.apache.maven.plugins
          maven-compiler-plugin
          ${maven.compiler.plugin.version}
          
            ${maven.compiler.source}
            ${maven.compiler.target}
            ${project.build.sourceEncoding}
          
        
        
          org.mybatis.generator
          mybatis-generator-maven-plugin
          1.3.2
          
            
            
              mysql
              mysql-connector-java
              ${mysql.version}
            
          
          
            true
          
        
        
          maven-clean-plugin
          3.1.0
        
        
        
          maven-resources-plugin
          3.0.2
        
        
          maven-compiler-plugin
          3.8.0
        
        
          maven-surefire-plugin
          2.22.1
        
        
          maven-war-plugin
          3.2.2
        
        
          maven-install-plugin
          2.5.2
        
        
          maven-deploy-plugin
          2.8.2
        
      
    
  


2、编写配置文件

 

2.1 applicationContext.xml
spirng核心配置文件,引入文件




       
       
       

2.2applicationContext-mybatis.xml



    
    
    
    
    

    

    
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
    

    
    
    
        
        
        
        
        
        
        
        
            
                
                    
                        
                            helperDialect=mysql
                        
                    
                
            
        
    

    
    
    
        
        
        
        
    

    
        
    
    
    


2.3注解式开发

@Repository:将DAO类声明为Bean
@Service:通常作用在业务层
@Constroller:通常作用在控制层,将在Spring MVC中使用
@Component:是一个泛化的概念,仅仅表示spring中的一个组件(Bean),可以作用在任何层次
@Scope:模式声明(singleton|prototype)
@Autowired:将自动在代码上下文与其匹配(默认是类型匹配)的Bean,并自动注入到相应的地方
@Resource:
1)@Resource后面没有任何内容,默认通过name属性去匹配bean,找不到再按type去匹配
2)指定了name或者type则根据指定的类型去匹配bean
3)指定了name和type则根据指定的name和type去匹配bean,任何一个不匹配都将报错

问题:@Autowired和@Resource两个注解的区别:
1)@Autowired默认按照byType方式进行bean匹配,@Resource默认按照byName方式进行bean匹配
2)@Autowired是Spring的注解,@Resource是J2EE的注解,这个看一下导入注解的时候这两个注解的包名就一清二楚了
Spring属于第三方的,J2EE是Java自己的东西,因此,建议使用@Resource注解,以减少代码和Spring之间的耦合。

@Transactional
2.4 jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/tb_student?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123

 2.5 log4j2.xml





    
        
        /root/workspace/lucenedemo/logs
        /root/workspace/lucenedemo/logs/error
        /root/workspace/lucenedemo/logs/warn
        %d{yyyy-MM-dd HH:mm:ss.SSS} [%t-%L] %-5level %logger{36} - %msg%n
    

    
        
        
            
            
            
            
            
        

        
        
        
            
        
        
        
            
            
            
            
                
                
                
                
                
                
            
        

        
            
            
            
                
                
            
            
            
        

        
            
            
            
                
                
                
            
        

    

    
    
        
        
        

        
        
        
        
        
        


        
        
            
            
            
            
        
    

3、代码测试

 实体类Model ——Book.java
 set/get/toString 方法省略— 

package com.hyf.ssm.model;

public class Book {
    private Integer bid;

    private String bname;

    private Float price;

}

Mapper dao层——BookMapper.java
@Repository 将DAO类声明为Bean

package com.hyf.ssm.mapper;

import com.hyf.ssm.model.Book;
import org.springframework.stereotype.Repository;

import java.util.List;
import java.util.Map;

@Repository
public interface BookMapper {
   // 通过Id进行删除
 int deleteByPrimaryKey(Integer bid);
 // 通过Id查询一条数据
 Book selectByPrimaryKey(Integer bid);
}

BookMapper.xml




  
    
      
      
      
    
  
  
    bid, bname, price
  

  
    delete from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  
  
  

接口Server ——BookServer

package com.hyf.ssm.service;

import com.hyf.ssm.model.Book;
import com.hyf.ssm.utils.PageBean;

import java.util.List;
import java.util.Map;

/**
 * @author xhy
 * @site www.4399.com
 * @company xxx公司
 * @create 2019-11-17 11:48
 */
public interface BookService {
    int deleteByPrimaryKey(Integer bid);

    Book selectByPrimaryKey(Integer bid);
}

实现类——BookServerImpl.java

@Service 通常作用在业务层
@Autowired Autowired默认按照byType方式进行bean匹配

package com.hyf.ssm.service.impl;

import com.hyf.ssm.mapper.BookMapper;
import com.hyf.ssm.model.Book;
import com.hyf.ssm.service.BookService;
import com.hyf.ssm.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;

/**
 * @author xhy
 * @site www.4399.com
 * @company xxx公司
 * @create 2019-11-17 11:49
 */

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookMapper bookMapper;

    public BookMapper getBookMapper() {
        return bookMapper;
    }

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    @Override
    public int deleteByPrimaryKey(Integer bid) {
        return this.bookMapper.deleteByPrimaryKey(bid);
    }

    @Override
    public Book selectByPrimaryKey(Integer bid) {
        return this.bookMapper.selectByPrimaryKey(bid);
    }
}

Spring Test+junit完美组合

 在工程的pom文件中增加spring-test的依赖


       org.springframework
       spring-test
       ${spring.version}
     

创建SpringBaseTest ,并在该类上加上两个注解
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={“classpath:applicationContext.xml”})

package com.hyf.ssm;

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author xhy
 * @site www.4399.com
 * @company xxx公司
 * @create 2019-11-17 12:06
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext.xml"})
public class SpringBaseTest {
}

继承 SpringBaseTest ——BookServiceImplTest.java
如果不继承的话所用 就不能注解@Autowired

 

package com.hyf.ssm.service.impl;

import com.hyf.ssm.SpringBaseTest;
import com.hyf.ssm.service.BookService;
import com.hyf.ssm.utils.PageBean;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.HashMap;
import java.util.Map;

/**
 * @author xhy
 * @site www.4399.com
 * @company xxx公司
 * @create 2019-11-17 12:09
 */
public class BookServiceImplTest extends SpringBaseTest {
    @Autowired
    private BookService bookService;

    @Test
    public void deleteByPrimaryKey() {
        this.bookService.deleteByPrimaryKey(55);
    }

    @Test
    public void selectByPrimaryKey() {
        System.out.println(this.bookService.selectByPrimaryKey(12));
    }
  
}

查出来值,整合完毕

 

2、Aop整合pagehelper插件

pom 依赖
上方已导入

注意:记得开动态代理

使用AOP编程解决分页代码重复的问题
@Around(“execution(* *…*Service.*Pager(…))”)
public Object invoke(ProceedingJoinPoint args)

语法结构:execution(方法修饰符 方法返回值 方法所属类 匹配方法名 ( 方法中的形参表 ) 方法申明抛出的异常 )
“*” :代表一个任意类型的参数;
“…”:代表零个或多个任意类型的参数。
切面的分页类

package com.hyf.ssm.aspect;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.hyf.ssm.utils.PageBean;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * @author xhy
 * @site www.4399.com
 * @company xxx公司
 * @create 2019-11-17 18:45
 */
@Component
@Aspect   // 定义切面
public class PagerAspect {
    @Around("execution(* *..*Service.*Pager(..))")
    public Object invoke(ProceedingJoinPoint joinPoint) throws Throwable{
//        获取目标对象方法的参数集合
        Object[] args = joinPoint.getArgs();
        PageBean pageBean = null;
        for (Object arg :args){
            System.out.println(arg);
            if(arg instanceof PageBean){
                pageBean = (PageBean) arg;
                break;
            }
        }
        if(pageBean != null && pageBean.isPagination()){
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }
        Object proceed = joinPoint.proceed(args);
        if(pageBean != null && pageBean.isPagination()){
            PageInfo pageInfo = new PageInfo((List)proceed);
            pageBean.setTotal(pageInfo.getTotal()+"");
        }
        return  proceed;
    }
}

 Boojmapper

  List listPage(Map map);

Boojmapper.xml

   @Override
    public List listPager(Map map, PageBean pageBean) {
        return this.bookMapper.listPage(map);
    }

BookServiceImplTest.java

 @Test
    public void listPage() {
        Map m = new HashMap();
        m.put("bname","圣墟");
        PageBean pageBean = new PageBean();
        pageBean.setPage(3);
        for (Map map : this.bookService.listPager(m, pageBean)) {
            System.out.println(map);
        }
        System.out.println("pageBean :"+pageBean);
    }

控制台输出

 

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