SSM整合框架之多对多查询
2018-11-25 13:16
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什么是SSM框架：
SSM框架就是Spring、SpringMVC、MyBatis三个框架的整合，是标准的MVC模式，将整个系统划分为表现层、Controller层、Service层、Dao层四层。使用SpringMVC负责请求的转发和视图管理，Spring实现业务对象管理，Mybatis作为数据对象的持久化引擎
简单介绍了下SSM，就直接上代码吧！
先引入jar包
pom.xml
<properties>
<!-- spring版本号 -->
<spring.version>4.0.2.RELEASE</spring.version>
<!-- mybatis版本号 -->
<mybatis.version>3.2.6</mybatis.version>
<!-- log4j日志文件管理包版本 -->
<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<!-- 表示开发的时候引入，发布的时候不会加载此包 -->
<scope>test</scope>
</dependency>
<!-- <dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency> -->
<!-- spring核心包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</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-oxm</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-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- mybatis/spring包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<!-- 导入java ee jar 包 -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<!-- 导入Mysql数据库链接jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
<!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!-- JSTL标签类 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 日志文件管理包 -->
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<!-- 格式化对象，方便输出日志 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- log end -->
<!-- 映入JSON -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<!-- 上传组件包 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
</dependencies>
<build>
<finalName>maven01</finalName>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.2.8.v20150217</version>
<configuration>
<httpConnector>
<port>80</port>
</httpConnector>
<stopKey>shutdown</stopKey>
<stopPort>9966</stopPort>
</configuration>
</plugin>
</plugins>
</build>
写配置文件
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>ssm_bookstore</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>bookstore</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:spring_MVC.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>bookstore</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:application_Context.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app>
spring_MVC.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:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"> <mvc:annotation-driven /> <context:component-scan base-package="com.bs.admin.controller"/> <!-- 视图构造器 视图对象 --> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 文件上传会用到 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="2048000000"/> <property name="maxInMemorySize" value="409600000"/> <property name="maxUploadSizePerFile" value="2048000000"/> <property name="defaultEncoding" value="UTF-8"/> <property name="resolveLazily" value="true"/> </bean> <!-- 注册拦截器 --> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.bs.admin.interceptor.BookInterceptor"/> </mvc:interceptor> </mvc:interceptors>
application_context.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:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"> <context:component-scan base-package="com.bs.admin"> <context:exclude-filter type="regex" expression="$[A-Z]\w*Controller^"/> </context:component-scan> <!-- 导入spring myBatis整合的配置文件 --> <import resource="classpath*:spring_mybatis.xml"/> </beans>
spring_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-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"> <!-- 选择并配置数据源，使用c3p0.ComboPooledDataSource会自动加载classpath下的c3p0.properties --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" /> <!-- 生成SessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- 扫描实体类 --> <property name="typeAliasesPackage" value="com.bs.admin.pojo" /> <!-- 扫描XxxMapper.xml， mapperLocations：指明Mapper.xml文件路径 --> <property name="mapperLocations" value="classpath*:com/bs/admin/mapper/xml/*Mapper.xml" /> <!-- configuration：配置 --> <property name="configuration"> <bean class="org.apache.ibatis.session.Configuration"> <!-- mapUnderscoreToCamelCase：将下划线映射到驼峰大小写 --> <property name="mapUnderscoreToCamelCase" value="true" /> <!-- cacheEnabled：激活缓存 --> <property name="cacheEnabled" value="true"/> </bean> </property> </bean> <!-- 注册接口文件 --> <bean class="org.mybatis.spring.mapper.MapperScannerConf 1aa70 igurer"> <property name="basePackage" value="com.bs.admin.mapper" /> </bean> <!-- 事务控制 --> <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 开启注解式事务 --> <!-- <tx:annotation-driven/> --> <tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <!-- read-only="true" : 告诉mybatis只需要创建一个只读的Connection --> <tx:method name="add*" propagation="REQUIRED" rollback-for="java.sql.SQLException" /> <tx:method name="delete*" propagation="REQUIRED" rollback-for="java.sql.SQLException" /> <tx:method name="modify*" propagation="REQUIRED" rollback-for="java.sql.SQLException" /> <tx:method name="get*" read-only="true"/> </tx:attributes> </tx:advice> <!-- 配置aop切口 --> <aop:config> <aop:advisor advice-ref="txAdvice" pointcut="execution(public * com.bs.admin.service..*.*(..))" /> </aop:config> </beans>
创建表
t_book
t_author
t_book_author 创建多对多的关系需要中间表
pojo实体类
书的实体类
package com.bs.admin.pojo;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
/**
*
* <p>Title: Book</p>
* <p>Description: Book实体类</p>
* @author Jack.Hu
* <p> @date 2018年11月21日</p>
*/
public class Book implements Serializable {
private static final long serialVersionUID = 597733879789573558L;
private Long primaryId;
private Long bookId;
private String bookName;
private Set<Author> authors = new HashSet<Author>(); // 作者与书，多对多
private String bookCategory; // 书的种类
private Long bookPurchasePrice; // 进价
private Long bookSalesPrice; // 售价
private String bookProfile; // 简介
private String bookCoverImage; // 图片路径
private Long publisherId; // 出版社id
private Long printId; // 印刷id
private Set<Activity> activity = new HashSet<Activity>(); // 活动与书多对多
public Book(){
}
public Book(Long primaryId, Long bookId, String bookName, Set<Author> authors, String bookCategory, Long bookPurchasePrice,Long bookSalesPrice, String bookProfile, String bookCoverImage, Long publisherId, Long printId, Set<Activity> activity) {
this.primaryId = primaryId;
this.bookId = bookId;
this.bookName = bookName;
this.authors = authors;
this.bookCategory = bookCategory;
this.bookPurchasePrice = bookPurchasePrice;
this.bookSalesPrice = bookSalesPrice;
this.bookProfile = bookProfile;
this.bookCoverImage = bookCoverImage;
this.publisherId = publisherId;
this.printId = printId;
this.activity = activity;
}
@Override
public String toString() {
return "Book [主键：" + primaryId + ", 书号：" + bookId + ", 书名：" + bookName +", 作者："+ authors + ", 种类：" + bookCategory + ", 进价：" + bookPurchasePrice + ", 售价：" + bookSalesPrice
+ ", 简介：" + bookProfile + ", 图片路径：" + bookCoverImage + ", 出版者id：" + publisherId + ", 印刷商id：" + printId +", 活动：" + activity + "]";
}
// .......忽略get set方法.......
}
作者的实体类
package com.bs.admin.pojo;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
/**
*
* <p>Title: Author</p>
* <p>Description: 作者的实体类</p>
* @author jack.Hu
* <p> @date 2018年11月21日</p>
*/
public class Author implements Serializable {
private static final long serialVersionUID = -2631951426846305889L;
private Integer authorId;
private String authorName;
private Set<Book> books = new HashSet<Book>();
public Author(){
}
public Author(Integer authorId, String authorName, Set<Book> books) {
this.authorId = authorId;
this.authorName = authorName;
this.books = books;
}
@Override
public String toString() {
return "Author [authorId=" + authorId + ", authorName=" + authorName + ", book：" + books +"]";
}
// .......忽略get set方法.......
}
Mapper层
BookMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.bs.admin.mapper.BookMapper">
<!-- 通过bookId查询书的信息 -->
<select id="getBookByBookId" resultMap="BookResultMap">
select <include refid="bookColumns"/>,<include refid="authorColumns"/>
from t_book b,t_author a,t_book_author ba
where ba.book_id = b.book_id
and ba.author_id = a.author_id
and b.book_id = #{bookId}
</select>
<resultMap type="book" id="BookResultMap" autoMapping="true">
<id property="primaryId" column="primary_id"/>
<!-- 多对多查询 -->
<collection property="authors" ofType="author" autoMapping="true"/>
</resultMap>
<sql id="bookColumns">
primary_id, b.book_id,b.book_name,b.book_category,b.book_purchasePrice,b.book_salesPrice,
b.book_profile,b.book_coverImage,b.publisher_id,b.print_id
</sql>
<sql id="authorColumns">
a.author_id, a.author_name
</sql>
</mapper>
BookMapper接口
package com.bs.admin.mapper;
import com.bs.admin.pojo.Book;
public interface BookMapper {
Book getBookByBookId(Long bookId);
Integer createBook(Book book);
}
dao层
接口
package com.bs.admin.dao;
import org.springframework.stereotype.Repository;
import com.bs.admin.pojo.Book;
@Repository
public interface BookDao {
Book retrieveBookByBookId(Long bookId);
}
实现类
package com.bs.admin.dao.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.bs.admin.dao.BookDao;
import com.bs.admin.mapper.BookMapper;
import com.bs.admin.pojo.Book;
@Repository
public class BookDaoImpl implements BookDao {
@Autowired
private BookMapper bm;
@Override
public Book retrieveBookByBookId(Long bookId) {
Book book = bm.getBookByBookId(bookId);
return book;
}
}
service层
接口
package com.bs.admin.service;
import org.springframework.stereotype.Service;
import com.bs.admin.pojo.Book;
@Service
public interface BookService {
Book getBookByBookId(Long bookId);
}
实现类
package com.bs.admin.service.impl;
import java.util.Set;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.bs.admin.dao.BookDao;
import com.bs.admin.dao.impl.BookDaoImpl;
import com.bs.admin.pojo.Book;
import com.bs.admin.service.BookService;
@Service
public class BookServiceImpl implements BookService{
@Autowired
private BookDao bd;
@Override
public Book getBookByBookId(Long bookId) {
Book book = bd.retrieveBookByBookId(bookId);
return book;
}
}
controller层
BookstoreController
package com.bs.admin.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.bs.admin.pojo.Author;
import com.bs.admin.pojo.Book;
import com.bs.admin.service.AuthorService;
import com.bs.admin.service.BookService;
@RestController
@RequestMapping("bookstore")
public class BookstoreController {
@Autowired
private BookService bs;
@Autowired
private AuthorService as;
@GetMapping("{bookId}/getBook")
public @ResponseBody Book getBook(@PathVariable("bookId") Long bookId) {
Book book = bs.getBookByBookId(bookId);
System.out.println("book对象: " + book);
return book;
}
}
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