Spring集成MyBatis 及Aop分页的实现代码
作者:LJT_1314520
这篇文章主要介绍了Spring集成MyBatis 及Aop分页的实现,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
一、首先我们先创建一个Maven项目
把我们需要的包先准备好
1.打开pom.xml文件引入依赖,以下是整个pom.xml文件
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zking</groupId> <artifactId>untitled12</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>untitled12 Maven Webapp</name> <url>http://maven.apache.org</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> <!--junit+servlet--> <junit.version>4.12</junit.version> <servlet.version>4.0.1</servlet.version> <!--spring--> <spring.version>5.3.18</spring.version> <!--mybatis--> <mybatis.version>3.4.5</mybatis.version> <!--mysql--> <mysql.version>8.0.30</mysql.version> <!--pagehelper--> <pagehelper.version>5.1.2</pagehelper.version> <!--mybatis-spring--> <mybatis.spring.version>1.3.1</mybatis.spring.version> <!--dbcp2--> <commons.dbcp2.version>2.1.1</commons.dbcp2.version> <commons.pool2.version>2.4.3</commons.pool2.version> <!--log4j2--> <log4j2.version>2.9.1</log4j2.version> <slf4j.version>1.7.7</slf4j.version> <log4j2.disruptor.version>3.2.0</log4j2.disruptor.version> <!--lombok--> <lombok.version>1.18.12</lombok.version> </properties> <dependencies> <!--junit+servlet--> <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> </dependency> <!--spring--> <!-- ********************** spring依赖 ********************** --> <!--1)spring核心依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <!--spring ioc依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <!--spring 扩展依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <!--2)spring dao层依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <!--3)aop相关依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring.version}</version> </dependency> <!--4)spring web相关依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <!--5) spring test相关依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.5</version> </dependency> <!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!--mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!--pagehelper--> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>${pagehelper.version}</version> </dependency> <!--mybatis与spring集成依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis.spring.version}</version> </dependency> <!-- druid阿里的数据库连接池 --> <dependency> <artifactId>druid</artifactId> <groupId>com.alibaba</groupId> <version>1.1.10</version> </dependency> <!--dbcp2连接池--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-dbcp2</artifactId> <version>${commons.dbcp2.version}</version> <exclusions> <exclusion> <artifactId>commons-pool2</artifactId> <groupId>org.apache.commons</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>${commons.pool2.version}</version> </dependency> <!--日志 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <!-- slf4j日志包 --> <dependency> <artifactId>slf4j-log4j12</artifactId> <groupId>org.slf4j</groupId> <version>1.7.25</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombok.version}</version> <scope>provided</scope> </dependency> </dependencies> <build> <finalName>untitled12</finalName> <plugins> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> </dependencies> <configuration> <overwrite>true</overwrite> </configuration> </plugin> </plugins> </build> </project>
2.引入依赖之后咱们导入需要的xml文件
1.generatorConfig.xml文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" > <generatorConfiguration> <!-- 引入配置文件 --> <properties resource="jdbc.properties"/> <!--指定数据库jdbc驱动jar包的位置--> <classPathEntry location="D:\config\res\mysql\mysql-connector-java\8.0.30\mysql-connector-java-8.0.30.jar"/> <!-- 一个数据库一个context --> <context id="infoGuardian"> <!-- 注释 --> <commentGenerator> <property name="suppressAllComments" value="true"/><!-- 是否取消注释 --> <property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 --> </commentGenerator> <!-- jdbc连接 --> <jdbcConnection driverClass="${jdbc.driver}" connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/> <!-- 类型转换 --> <javaTypeResolver> <!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) --> <property name="forceBigDecimals" value="false"/> </javaTypeResolver> <!-- 01 指定javaBean生成的位置 --> <!-- targetPackage:指定生成的model生成所在的包名 --> <!-- targetProject:指定在该项目下所在的路径 --> <javaModelGenerator targetPackage="com.zking.ssm.spring.model" targetProject="src/main/java"> <!-- 是否允许子包,即targetPackage.schemaName.tableName --> <property name="enableSubPackages" value="false"/> <!-- 是否对model添加构造函数 --> <property name="constructorBased" value="true"/> <!-- 是否针对string类型的字段在set的时候进行trim调用 --> <property name="trimStrings" value="false"/> <!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法,只有构造方法 --> <property name="immutable" value="false"/> </javaModelGenerator> <!-- 02 指定sql映射文件生成的位置 --> <sqlMapGenerator targetPackage="com.zking.ssm.spring.mapper" targetProject="src/main/resources"> <!-- 是否允许子包,即targetPackage.schemaName.tableName --> <property name="enableSubPackages" value="false"/> </sqlMapGenerator> <!-- 03 生成XxxMapper接口 --> <!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 --> <!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 --> <!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 --> <javaClientGenerator targetPackage="com.zking.ssm.spring.mapper" targetProject="src/main/java" type="XMLMAPPER"> <!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model, true:com.oop.eksp.user.model.[schemaName] --> <property name="enableSubPackages" value="false"/> </javaClientGenerator> <!-- 配置表信息 --> <!-- schema即为数据库名 --> <!-- tableName为对应的数据库表 --> <!-- domainObjectName是要生成的实体类 --> <!-- enable*ByExample是否生成 example类 --> <table schema="" tableName="t_student" domainObjectName="Student" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false"> <!-- <!– 忽略列,不生成bean 字段 –>--> <!-- <!– <ignoreColumn column="FRED" /> –>--> <!-- <!– 指定列的java数据类型 –>--> <!-- <!– <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> –>--> </table> </context> </generatorConfiguration>
这是生成那些我们的实体类和mapper层还有对应mapper层的配置文件
2.jdbc.properties配置文件
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/y1?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC jdbc.username=root jdbc.password=root123
3.log4j.properties配置文件
log4j.rootLogger=DEBUG, stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%5p %d %C: %m%n log4j.logger.java.sql.ResultSet=INFO log4j.logger.org.apache=INFO log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.PreparedStatement=DEBUG
把以上配置好就可以进行生成那些代码了
然后打开Maven这个控制器
然后点击mybatis-generator运行他就行了,然后就会自动给你生成这些代码了
二、开始Spring集成MyBatis
1、首先我们先创建一个MyBatis.xml
<?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> <!-- 控制台查看拼接好的sql, settings标签要放在前面,顺序错了这个配置文件会报错--> <settings> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings> <!-- 批量定义别名,包下面的类批量取别名,别名就是类名(首字母小写) --> <typeAliases> <package name="com.zking.ssm"/> </typeAliases> </configuration>
2、之后就是创建Spring文件这个文件是Spring帮我们管理MyBatis
可能有些东西不同但是这个文件是必备的
<?xml version="1.0" encoding="UTF-8"?> <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" xmlns="http://www.springframework.org/schema/beans" 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 https://www.springframework.org/schema/aop/spring-aop.xsd"> <!--<context:component-scan base-package="com.tjise.bean"/>--> <context:component-scan base-package="com.zking.ssm"/> <!-- 加载数据库连接信息的属性文件 --> <context:property-placeholder location="classpath:jdbc.properties"/> <!-- 开启事务管理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <constructor-arg ref="dataSource"/> </bean> <!-- 配置Druid数据源的Bean --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!-- 配置SessionFactory的Bean --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--配置数据源--> <property name="dataSource" ref="dataSource"/> <!--配置mapper的路径--> <property name="mapperLocations" value="classpath:com/zking/ssm/spring/**/mapper/*.xml"/> <!--配置需要定义别名的实体类的包--> <property name="typeAliasesPackage" value="com.zking.spring.model"/> <!--配置需要mybatis的主配置文件--> <property name="configLocation" value="Mybatis.xml"/> <!-- 配置pagehelper插件--> <!-- 注意其他配置--> <property name="plugins"> <array> <bean class="com.github.pagehelper.PageInterceptor"> <property name="properties"> <!--使用下面的方式配置参数,一行配置一个 --> <value> helperDialect=mysql </value> </property> </bean> </array> </property> </bean> <!-- 配置mapper接口的扫描器,将Mapper接口的实现类自动注入到IoC容器中 实现类Bean的名称默认为接口类名的首字母小写 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <!-- basePackage属性指定自动扫描mapper接口所在的包 --> <property name="basePackage" value="com/zking/ssm/spring/**/mapper"/> </bean> <!-- <tx:advice id="TxAdvice" transaction-manager="transactionManager">--> <!-- <tx:attributes>--> <!-- <tx:method name="Insert*" isolation="REPEATABLE_READ" propagation="REQUIRED"/>--> <!-- <tx:method name="Update*" isolation="REPEATABLE_READ" propagation="REQUIRED"/>--> <!-- <tx:method name="Delete*" isolation="REPEATABLE_READ" propagation="REQUIRED"/>--> <!-- <tx:method name="Query*" isolation="REPEATABLE_READ" propagation="SUPPORTS"/>--> <!-- </tx:attributes>--> <!-- </tx:advice>--> <!--5.开启注解式事务--> <!-- <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">--> <!-- <property name="dataSource" ref="dataSource"/>--> <!-- </bean>--> <!--6.开启动态代理--> <aop:aspectj-autoproxy/> <tx:annotation-driven transaction-manager="transactionManager"/> </beans>
接下来就是我们写service来测试这个集成好没有,切记记得改jdbc.properties文件里面的参数和驱动程序要和你本机相同
1.创建IStudent借口
public interface IStudent { List<Student> listPager(Student student, PageBean pageBean); List<Student> selectByPager(@Param("student") Student student, PageBean pageBean); }
2.实现这个借口
@Service public class StudentImpl implements IStudent { //依赖注入,不写这个会报空值异常 @Autowired private StudentMapper studentMapper; @Override public List<Student> listPager(Student student, PageBean pageBean) { return studentMapper.listPager(student, pageBean); } @Paging //这是一个分页的注解 @Override public List<Student> selectByPager(Student student, PageBean pageBean) { return studentMapper.list(student, pageBean); } }
然后就可以去test 目录底下编写测试类了
测试类的编写
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "classpath*:Spring.xml") public class IStudentTest{ @Autowired private IStudent iStudent; @Test public void Pager() { Student student = new Student(); student.setSname(""); List<Student> students = iStudent.selectByPager(student, new PageBean()); students.forEach(t -> System.out.println(t)); } }
然后就是去编写咱们的aop切面编程了
首先我们要一个分页对象
PageBean.java
package com.zking.ssm.spring.util; import lombok.*; import lombok.experimental.Accessors; import javax.servlet.http.HttpServletRequest; import java.util.Map; //val : 最终局部变量 //@NonNull : 让你不在担忧并且爱上NullPointerException(可以在参数的类型前面加上注解) //@CleanUp : 自动资源管理:不用再在finally中添加资源的close方法 //@Setter/@Getter : 自动生成set和get方法 //@ToString : 自动生成toString方法 //@EqualsAndHashcode : 从对象的字段中生成hashCode和equals的实现 //@NoArgsConstructor/@RequiredArgsConstructor/@AllArgsConstructor //自动生成构造方法 //@Data : 自动生成set/get方法,toString方法,equals方法,hashCode方法,不带参数的构造方法 //@Value : 用于注解final类 //@Builder : 产生复杂的构建器api类 //@SneakyThrows : 异常处理(谨慎使用) //@Synchronized : 同步方法安全的转化 //@Getter(lazy=true) : //@Log : 支持各种logger对象,使用时用对应的注解,如:@Log4j @AllArgsConstructor @NoArgsConstructor @ToString @EqualsAndHashCode @Accessors(chain = true) @Data /** * 用来放分页的参数 */ public class PageBean { private Integer total; //数据库的总条数 private Integer page = 1; //当前页数 private Integer row = 5; //当前显示的条数 private boolean pagination = true; //是否需要分页 private String url; private Map<String, String[]> ms; public PageBean(HttpServletRequest req) { String page = req.getParameter("page"); String row = req.getParameter("row"); if (page != null && page.length() > 0) { this.setPage(Integer.parseInt(page)); } if (row != null && row.length() > 0) { this.setRow(Integer.parseInt(row)); } String pagination = req.getParameter("pagination"); if (pagination != null && pagination.equals("false")) { this.setPagination(false); } this.ms = req.getParameterMap(); } /** * 计算开始位置 */ public Integer start() { return (page - 1) * row; } /** * 计算最大页数 */ public Integer max() { return total % row == 0 ? total / row : total / row + 1; } /** * 计算下一页 */ public Integer next() { return Math.min(page + 1, max()); } /** * 计算上一页 */ public Integer prev() { return Math.max(page - 1, 1); } }
然后我们要编写aop切面编程了
PageAspect.java
package com.zking.ssm.spring.aop; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.zking.ssm.spring.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; /** * @author小李飞刀 * @site www.xiaomage.com * @company xxx公司 * @create 2023-03-30 16:33 */ @Component @Aspect public class PageAspect { @Around("execution(* *..*Service.*Pager(..))") public Object invoke(ProceedingJoinPoint joinPoint) throws Throwable { //获取目标方法的执行参数 Object[] args = joinPoint.getArgs(); //定义PageBean对象 PageBean pageBean = null; for (Object param : args) { //判断执行参数中是否有PageBean对象 if (param instanceof PageBean) { pageBean = (PageBean) param; break; } } //判断是否分页 if (pageBean != null && pageBean.isPagination()) { PageHelper.startPage(pageBean.getPage(), pageBean.getRow()); } Object returnValue = joinPoint.proceed(args); if (pageBean != null && pageBean.isPagination()) { if (null != returnValue && returnValue instanceof List) { List list = (List) returnValue; PageInfo pageInfo = new PageInfo(list); pageBean.setTotal((int) pageInfo.getTotal()); } } return returnValue; } }
@Around("execution(* *..*Service.*Pager(..))")的意思是环绕通知然后里面的是必须是打了@Service注解的类才能识别到,*Pager就是以Pager结尾的前面所以的名字都可以识别到,然后(..)是方法参数不限制
编写好之后
就可以去测试了
但是这样会有识别不到的风险
所以咱们使用注解进行分页
package com.zking.ssm.spring.aop; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.zking.ssm.spring.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; /** * @author小李飞刀 * @site www.xiaomage.com * @company xxx公司 * @create 2023-04-01 8:44 */ @Component @Aspect public class PagerAop { //环绕通知 自定义注解 分辨是否调用 @Around("@annotation(com.zking.ssm.spring.interfaces.Paging)") public Object around(ProceedingJoinPoint joinPoint) throws Throwable { //获取目标方法的所有参数 Object[] args = joinPoint.getArgs(); PageBean pag = null; for (Object arg : args) { if (arg instanceof PageBean) { pag = (PageBean) arg; if (pag != null && pag.isPagination()) { PageHelper.startPage(pag.getPage(), pag.getRow()); } } } Object proceed = joinPoint.proceed(); if (pag != null && pag.isPagination()) { PageInfo info = new PageInfo((List) proceed); pag.setTotal((int) info.getTotal()); } return proceed; } }
然后就是写@Paging
//编译加载 @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.METHOD, ElementType.PARAMETER}) public @interface Paging { }
然后就可以在你要实现的类中打上注解就行了
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