一、Mybatis与spring集成
1. 导入pom依赖
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>
<!--添加jar包依赖-->
<!--1.spring 5.0.2.RELEASE相关-->
<spring.version>5.0.2.RELEASE</spring.version>
<!--2.mybatis相关-->
<mybatis.version>3.4.5</mybatis.version>
<!--mysql-->
<mysql.version>5.1.44</mysql.version>
<!--pagehelper分页jar依赖-->
<pagehelper.version>5.1.2</pagehelper.version>
<!--mybatis与spring集成jar依赖-->
<mybatis.spring.version>1.3.1</mybatis.spring.version>
<!--3.dbcp2连接池相关 druid-->
<commons.dbcp2.version>2.1.1</commons.dbcp2.version>
<commons.pool2.version>2.4.3</commons.pool2.version>
<!--4.log日志相关-->
<log4j2.version>2.9.1</log4j2.version>
<!--5.其他-->
<junit.version>4.12</junit.version>
<servlet.version>4.0.0</servlet.version>
<lombok.version>1.18.2</lombok.version>
</properties>
<dependencies>
<!--1.spring相关-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!--2.mybatis相关-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!--pagehelper分页插件jar包依赖-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
<!--mybatis与spring集成jar包依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis.spring.version}</version>
</dependency>
<!--3.dbcp2连接池相关-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>${commons.dbcp2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
<version>${commons.pool2.version}</version>
</dependency>
<!--4.log日志相关依赖-->
<!--核心log4j2jar包-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!--web工程需要包含log4j-web，非web工程不需要-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!--5.其他-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<resources>
<!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
<resource>
<directory>src/main/resources</directory>
<includes>
<include>jdbc.properties</include>
<include>*.xml</include>
</includes>
</resource>
</resources>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven.compiler.plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<dependencies>
<!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
</configuration>
</plugin>
2. 编写配置文件
applicationContext-mybatis.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--1. 注解式开发 -->
<!-- 注解驱动 -->
<context:annotation-config/>
<!-- 用注解方式注入bean，并指定查找范围：com.javaxl.ssm及子子孙孙包-->
<context:component-scan base-package="com.xlb"/>
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!--初始连接数-->
<property name="initialSize" value="10"/>
<!--最大活动连接数-->
<property name="maxTotal" value="100"/>
<!--最大空闲连接数-->
<property name="maxIdle" value="50"/>
<!--最小空闲连接数-->
<property name="minIdle" value="10"/>
<!--设置为-1时，如果没有可用连接，连接池会一直无限期等待，直到获取到连接为止。-->
<!--如果设置为N（毫秒），则连接池会等待N毫秒，等待不到，则抛出异常-->
<property name="maxWaitMillis" value="-1"/>
</bean>
<!--4. spring和MyBatis整合 -->
<!--1) 创建sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 指定数据源 -->
<property name="dataSource" ref="dataSource"/>
<!-- 自动扫描XxxMapping.xml文件，**任意路径 -->
<property name="mapperLocations" value="classpath*:com/xlb/**/mapper/*.xml"/>
<!-- 指定别名 -->
<property name="typeAliasesPackage" value="com/javaxl/ssm/**/model"/>
<!--配置pagehelper插件-->
<property name="plugins">
<array>
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<value>
helperDialect=mysql
</value>
</property>
</bean>
</array>
</property>
</bean>
<!--2) 自动扫描com/javaxl/ssm/**/mapper下的所有XxxMapper接口(其实就是DAO接口)，并实现这些接口，-->
<!-- 即可直接在程序中使用dao接口，不用再获取sqlsession对象-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--basePackage 属性是映射器接口文件的包路径。-->
<!--你可以使用分号或逗号 作为分隔符设置多于一个的包路径-->
<property name="basePackage" value="com/javaxl/ssm/**/mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<aop:aspectj-autoproxy/>
</beans>
3. 使用注解开发
@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
4. 测试
我们就可以把BookBizImpl实现类里面添加两个注解，相当于省略了set、get方法
package com.xlb.biz.impl;
import com.xlb.biz.BookBiz;
import com.xlb.mapper.BookMapper;
import com.xlb.model.Book;
import com.xlb.model.BookVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Map;
@Service
public class BookBizImpl implements BookBiz {
@Autowired
private BookMapper bookMapper;
//Alt+Enter 快速构建实现类，填充代码的前半部分 Ctrl+1
//Alt+Insert 快速提供set/get/toString/构造方法
/*public BookMapper getBookMapper() {
return bookMapper;
}
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}*/
@Override
public int deleteByPrimaryKey(Integer bid) {
return bookMapper.deleteByPrimaryKey(bid);
}
@Override
public Book selectByPrimaryKey(Integer bid) {
return bookMapper.selectByPrimaryKey(bid);
}
@Override
public List<Book> selectByIn(List bookIds) {
return bookMapper.selectByIn(bookIds);
}
public List<Book> selectBooksLike1(String bname){
return bookMapper.selectBooksLike1(bname);
}
public List<Book> selectBooksLike2(String bname){
return bookMapper.
selectBooksLike2(bname);
}
public List<Book> selectBooksLike3(String bname){
return bookMapper.selectBooksLike3(bname);
}
@Override
public List<Book> list1() {
return bookMapper.list1();
}
@Override
public List<Book> list2() {
return bookMapper.list2();
}
@Override
public List<Book> list3(BookVo vo) {
return bookMapper.list3(vo);
}
@Override
public List<Map> list4() {
return bookMapper.list4();
}
@Override
public Map list5(Map map) {
return bookMapper.list5(map);
}
@Override
public List<Book> list6(BookVo bookVo) {
return bookMapper.list6(bookVo);
}
@Override
public List<Book> list7(BookVo bookVo) {
return list7(bookVo);
}
}
5. 管理数据源
管理sqlsession
我们还要给BookMapper.java添加一个标记：
然后在测试类里面添加：
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={“classpath:applicationContext-mybatis.xml”})
package com.xlb.biz.impl;
import com.xlb.biz.BookBiz;
import com.xlb.mapper.BookMapper;
import com.xlb.model.BookVo;
import com.xlb.util.SessionUtil;
import com.xlb.biz.impl.BookBizImpl;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.junit.Assert.*;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class BookBizImplTest {
private BookBiz bookBiz;
private SqlSession sqlSession;
@Before
public void setUp() throws Exception {
System.out.println("初始化方法...");
BookBizImpl bookBiz = new BookBizImpl();
//工具类中获取session对象
sqlSession = SessionUtil.openSession();
System.out.println(sqlSession+"初始化方法");
//从session对象中获取mapper对象
BookMapper mapper = sqlSession.getMapper(BookMapper.class);
bookBiz.setBookMapper(mapper);
this.bookBiz = bookBiz;
}
@After
public void tearDown() throws Exception {
System.out.println("方法测试结束...");
System.out.println(sqlSession);
sqlSession.commit();
sqlSession.close();
}
@Test
public void deleteByPrimaryKey() {
bookBiz.deleteByPrimaryKey(44);
sqlSession.commit();
sqlSession.close();
}
@Test
public void selectByPrimaryKey() {
System.out.println("测试的业务方法...");
System.out.println(bookBiz.selectByPrimaryKey(44));
}
@Test
public void text3() {
int[] ints = {1,2,3,4};
//将数组变为字符串
StringBuffer sb = new StringBuffer();
for (int i : ints){
sb.append(",").append(i);
}
String s = sb.toString();
System.out.println(s.substring(1));
}
@Test
public void selectByIn() {
List<Integer> integers = Arrays.asList(new Integer[] {33,34,32});
bookBiz.selectByIn(integers).forEach(System.out::println);
}
@Test
public void selectBooksLike1() {
bookBiz.selectBooksLike1("%圣嘘%").forEach(System.out::println);
}
@Test
public void selectBooksLike2() {
bookBiz.selectBooksLike2("%圣嘘%").forEach(System.out::println);
}
@Test
public void selectBooksLike3() {
bookBiz.selectBooksLike3("圣嘘").forEach(System.out::println);
}
@Test
public void list1() {
bookBiz.list1().forEach(System.out::println);
}
@Test
public void list2() {
bookBiz.list2().forEach(System.out::println);
}
@Test
public void list3() {
BookVo vo = new BookVo();
vo.setBooKIds(Arrays.asList(new Integer[]{31,32,33,34}));
bookBiz.list3(vo).forEach(System.out::println);
}
@Test
public void list4() {
bookBiz.list4().forEach(System.out::println);
}
@Test
public void list5() {
Map map = new HashMap();
map.put("bid",32);
System.out.println(bookBiz.list5(map));
}
@Test
public void list6() {
BookVo vo = new BookVo();
vo.setMax(45);
vo.setMin(35);
bookBiz.list6(vo).forEach(System.out::println);
}
@Test
public void list7() {
BookVo vo = new BookVo();
vo.setMax(45);
vo.setMin(35);
bookBiz.list7(vo).forEach(System.out::println);
}
}
结果
二、Aop整合pagehelper插件
要解决的问题
@Override
public List<Map> listPager(Map map, PageBean pageBean) {
//pageHelper分页插件相关代码
if(pageBean != null && pageBean.isPagination()){
PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
}
List<Map> maps=bookMapper.listPager(map,pageBean);
if(pageBean != null && pageBean.isPagination()){
//处理查询结果的前提，是需要分页的
PageInfo info=new PageInfo(maps);
pageBean.setTotal(info.getTotal()+"");
}
return maps;
}
可以使用AOP编程解决分页代码重复的问题，省掉重复的代码。
根据Spring aop所学，我们可以利用环绕通知来解决；
1、找到目标对象 -> *Biz.*Pager
2、写通知
目标对象该方法一定携带了PageBean对象
注解：@aspect：相当于配置了环绕通知
@component：交给Spring进行管理
@excution
建立一个切面类：PageAspect
package com.xlb.ssm.aspect;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.xlb.ssm.entity.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;
@Component
@Aspect
public class PageAspect {
/**
* *：返回值
* *..：无限包
* *Service：以Service结尾的接口名
* .Pager：以Pager方法
* 只要同时匹配上诉四个条件，就会被列为目标对象
* 上诉配置要生效，代理注释一定要打开：<aop:aspectj-autoproxy/>
* @param args
* @return
* @throws Throwable
*/
@Around("execution(* *..*Biz.*Pager(..))")
public Object invoke(ProceedingJoinPoint args) throws Throwable {
Object[] params = args.getArgs();
PageBean pageBean = null;
for (Object param : params) {
if(param instanceof PageBean){
pageBean = (PageBean)param;
break;
}
}
if(pageBean != null && pageBean.isPagination())
PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
Object list = args.proceed(params);
if(null != pageBean && pageBean.isPagination()){
PageInfo pageInfo = new PageInfo((List) list);
pageBean.setTotal(pageInfo.getTotal()+"");
}
return list;
}
}
@Around：代表这是一个环绕通知
测试一下
@Test
public void listPager() {
Map map=new HashMap();
map.put("bname","圣墟");
//查询出第二页的20条数据
PageBean pageBean=new PageBean();
pageBean.setPage(2);
pageBean.setRows(20);
bookBiz.listPager(map,pageBean).forEach(System.out::println);
}
结果：
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原文出处：https://blog.csdn.net/qq_63531917/article/details/126339879