一、ybatis与spring集成
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
添加mybatis相关依赖:
?mybatis核心:mybatis(3.4.5)、Mybatis分页:pagehelper(5.1.2)
?spring整合mybatis(1.3.1):
mybatis-spring
添加dbcp2连接池:
commons-dbcp2(2.1.1)、commons-pool2(2.4.3)
添加日志配置(2.9.1):
log4j-core、 log4j-api、log4j-web
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 ?
1、导入pom.xml相关插件?
<?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">
<parent>
<artifactId>ssm</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Mybatise</artifactId>
<packaging>war</packaging>
<name>Mybatise Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<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>
<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>
<build>
<finalName>ssm</finalName>
<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>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<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>${mysql.version}</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
2、利用mybatis逆向工程生成模型层层代码?
工作目录修改为当前模块
?3、利用mybatis逆向工程生成模型层层代码
?将所需的文件导入,我们这就引用了上一期内容:
4、编写配置文件applicationContext-mybatis.xml
?在resources类中新建文件applicationContext-mybatis.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--1. 注解式开发 -->
<!-- 注解驱动 -->
<context:annotation-config/>
<!-- 用注解方式注入bean,并指定查找范围:com.javaxl.ssm及子子孙孙包-->
<context:component-scan base-package="com.zxy"/>
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!--初始连接数-->
<property name="initialSize" value="10"/>
<!--最大活动连接数-->
<property name="maxTotal" value="100"/>
<!--最大空闲连接数-->
<property name="maxIdle" value="50"/>
<!--最小空闲连接数-->
<property name="minIdle" value="10"/>
<!--设置为-1时,如果没有可用连接,连接池会一直无限期等待,直到获取到连接为止。-->
<!--如果设置为N(毫秒),则连接池会等待N毫秒,等待不到,则抛出异常-->
<property name="maxWaitMillis" value="-1"/>
</bean>
<!--4. spring和MyBatis整合 -->
<!--1) 创建sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 指定数据源 -->
<property name="dataSource" ref="dataSource"/>
<!-- 自动扫描XxxMapping.xml文件,**任意路径 -->
<property name="mapperLocations" value="classpath*:com/zxy/**/mapper/*.xml"/>
<!-- 指定别名 -->
<property name="typeAliasesPackage" value="com/zxy/**/model"/>
<!--配置pagehelper插件-->
<property name="plugins">
<array>
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<value>
helperDialect=mysql
</value>
</property>
</bean>
</array>
</property>
</bean>
<!--2) 自动扫描com/javaxl/ssm/**/mapper下的所有XxxMapper接口(其实就是DAO接口),并实现这些接口,-->
<!-- 即可直接在程序中使用dao接口,不用再获取sqlsession对象-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--basePackage 属性是映射器接口文件的包路径。-->
<!--你可以使用分号或逗号 作为分隔符设置多于一个的包路径-->
<property name="basePackage" value="com/zxy/**/mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<!-- 注解式事务-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<aop:aspectj-autoproxy/>
</beans>
5、Spring Test+junit完美组合
①、在工程的pom文件中增加spring-test的依赖
? 我已经在前面就增加了依赖
<dependency>
<groupId>org.springframework</groupId> <artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
?②、创建测试类,在该类上加上两个注解
@RunWith(SpringJUnit4ClassRunner.class):用于指定junit运行环境,是junit提供给其他框架测试环境接口扩展,为了便于使用spring的依赖注入 @ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"}):可以用classes来直接导入同包下写的配置类。或者导入配置文件
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext.xml"})
?同样service层也需注解,这样无需写get/set方法:
(@Autowired:是可以让spring完成自动装配的用途)
??测试一下查看的方法,检查是否成功:
这里用上篇博客的代码进行修改并验证
package com.zxy.service.imp;
import com.zxy.mapper.BookMapper;
import com.zxy.model.Book;
import com.zxy.service.BookService;
import com.zxy.util.PageBean;
import com.zxy.util.SessionUtil;
import com.zxy.vo.BookVo;
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.beans.factory.annotation.Autowired;
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;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class BookServiceImplTest2 {
@Autowired
private BookService bookService;
private SqlSession sqlSession;
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void selectBooksIn() {
System.out.println("mybatis的foreach方法");
List<Book> books = this.bookService.selectBooksIn(Arrays.asList(new Integer[]{35, 36, 37}));
books.forEach(System.out::println);
}
@Test
public void testDeleteByPrimaryKey() {
System.out.println("业务方法");
this.bookService.deleteByPrimaryKey(23);
}
@Test
public void selectBooksLike1() {
System.out.println("#模糊查询");
List<Book> books = this.bookService.selectBooksLike1("%圣墟%");
books.forEach(System.out::println);
}
@Test
public void selectBooksLike2() {
System.out.println("$模糊查询");
List<Book> books = this.bookService.selectBooksLike2("%圣墟%");
books.forEach(System.out::println);
}
@Test
public void selectBooksLike3() {
System.out.println("Concat模糊查询");
List<Book> books = this.bookService.selectBooksLike3("圣墟");
books.forEach(System.out::println);
}
@Test
public void List1() {
System.out.println("使用resultMap返回自定义类型集合");
List<Book> books = this.bookService.list1();
books.forEach(System.out::println);
}
@Test
public void List2() {
System.out.println("使用resultType返回List<T>");
List<Book> books = this.bookService.list2();
books.forEach(System.out::println);
}
@Test
public void List3() {
System.out.println("使用resultType返回单个对象");
BookVo booKVo = new BookVo();
booKVo.setBookIds(Arrays.asList(new Integer[]{49}));
System.out.println(this.bookService.list3(booKVo));
}
@Test
public void List4() {
System.out.println("使用resultType返回List<Map>,适用于多表查询返回结果集");
List<Map> books = this.bookService.list4();
books.forEach(System.out::println);
}
@Test
public void List5() {
System.out.println("使用resultType返回Map<String,Object>,适用于多表查询返回单个结果");
Map map = new HashMap();
map.put("bid",49);
Map m = this.bookService.list5(map);
System.out.println(m);
}
/*
* 结论1
* resultMap:多表查询会用
* resultType:单表查询
*
* 结论2
* List<T></>:单表
* List<Map></>:多表
*
* */
@Test
public void testPager() {
System.out.println("分页");
Map map = new HashMap();
map.put("bname","圣墟");
PageBean pageBean = new PageBean();
pageBean.setPage(4);
// 不分页
// pageBean.setPagination(false);
List<Map> m = this.bookService.listPager(map,pageBean);
System.out.println(m);
}
@Test
public void testlist6(){
System.out.println("特殊字符的处理--");
BookVo booKVo = new BookVo();
booKVo.setMin(20f);
booKVo.setMax(50f);
List<Book> books = this.bookService.list6(booKVo);
books.forEach(System.out::println);
}
@Test
public void testlist7(){
System.out.println("特殊字符的处理--");
BookVo booKVo = new BookVo();
booKVo.setMin(20f);
booKVo.setMax(50f);
List<Book> books = this.bookService.list7(booKVo);
books.forEach(System.out::println);
}
@Test
public void selectByPrimaryKey() {
System.out.println(this.bookService.selectByPrimaryKey( 45));
}
}
二、aop整合pagehelper
如果一个项目里有很多分页,每次都按照上一期内容写很麻烦,内容重复,这节内容就是使用AOP编程解决分页代码重复的问题。以下是每次分页需要写的方法👇
?根据👆总结分页内容:
? ? ? ? ①、定义分页的方法,分页方法至少要传递两个参数
? ? ? ? ②、 分页的核心关键点:pageBean、PageHelper
? ? ? ? ③、代码逻辑顺序
? ? ? ? ? ? ? ? PageHelper.startPage 启动分页
? ? ? ? ? ? ? ? 正常业务查询——》加入环绕通知中
? ? ? ? ? ? ? ? 处理查询的结果集——》加入环绕通知中
1、切面中需要思考的部分
1、pageHelper.startPage? ?启动分页>处理查询结果集>加入环绕通知中
2、切面类上要定义规则,只有分页方法才能进切面类
3、必须要判断*Pager是否传递了pageBean
2、编码阶段
1、拿到被代理的方法的参数列表,进行遍历,如果列表中包含了pagebean,给pagebean赋值
?2、核心代码 :? ?PageHelper.startPage? 启动分页>正常查询业务>处理查询结果集
1、新建一个切面类(类型为Java类class)
package com.zxy.aspect;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.zxy.util.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 PagerAspect {
@Around("execution(* *..*Service.*Pager(..))")
public Object invoke(ProceedingJoinPoint args) throws Throwable {
Object[] params = args.getArgs();//argument参数
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;
}
}
?
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