整合SSM

环境要求

数据库环境

创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8
INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

基本环境搭建

1. 新建一Maven项目！ ssmbuild ， 添加web的支持

2. 导入相关的pom依赖！

<dependencies>

<dependency>
    <groupId>junitgroupId>
    <artifactId>junitartifactId>
    <version>4.12version>
dependency>

<dependency>
    <groupId>mysqlgroupId>
    <artifactId>mysql-connector-javaartifactId>
    <version>5.1.47version>
dependency>

<dependency>
    <groupId>com.mchangegroupId>
    <artifactId>c3p0artifactId>
    <version>0.9.5.2version>
dependency>

<dependency>
    <groupId>javax.servletgroupId>
    <artifactId>servlet-apiartifactId>
    <version>2.5version>
dependency>
<dependency>
    <groupId>javax.servlet.jspgroupId>
    <artifactId>jsp-apiartifactId>
    <version>2.2version>
dependency>
<dependency>
    <groupId>javax.servletgroupId>
    <artifactId>jstlartifactId>
    <version>1.2version>
dependency>

<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatisartifactId>
    <version>3.5.2version>
dependency>
<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatis-springartifactId>
    <version>2.0.2version>
dependency>

<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-webmvcartifactId>
    <version>5.1.9.RELEASEversion>
dependency>
<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-jdbcartifactId>
    <version>5.1.9.RELEASEversion>
dependency>
dependencies>

3. Maven资源过滤设置

<build>
<resources>
    <resource>
        <directory>src/main/javadirectory>
        <includes>
            <include>**/*.propertiesinclude>
            <include>**/*.xmlinclude>
        includes>
        <filtering>falsefiltering>
    resource>
    <resource>
        <directory>src/main/resourcesdirectory>
        <includes>
            <include>**/*.propertiesinclude>
            <include>**/*.xmlinclude>
        includes>
        <filtering>falsefiltering>
    resource>
resources>
build>

4. 建立基本结构和配置框架！

com.kuang.pojo

com.kuang.dao

com.kuang.service

com.kuang.controller

mybatis-config.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>
configuration>

applicationContext.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
beans>

Mybatis层编写

1. 数据库配置文件 database.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?
useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

2. IDEA关联数据库

3. 编写MyBatis的核心配置文件

<?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>
    <typeAliases>
        <package name="com.kuang.pojo"/>
    typeAliases>
    <mappers>
        <mapper resource="com/kuang/dao/BookMapper.xml"/>
    mappers>
configuration>
    

4. 编写数据库对应的实体类 com.kuang.pojo.Books

使用lombok插件！

package com.kuang.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

5. 编写Dao层的 Mapper接口！

package com.kuang.dao;
import com.kuang.pojo.Books;
import java.util.List;
public interface BookMapper {
    //增加一个Book
    int addBook(Books book);
    //根据id删除一个Book
    int deleteBookById(int id);
    //更新Book
    int updateBook(Books books);
    //根据id查询,返回一个Book
    Books queryBookById(int id);
    //查询全部Book,返回list集合
    List queryAllBook();
}

6. 编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；

<?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.kuang.dao.BookMapper">

<insert id="addBook" parameterType="Books">
    insert into ssmbuild.books(bookName,bookCounts,detail)
    values (#{bookName}, #{bookCounts}, #{detail})
insert>

<delete id="deleteBookById" parameterType="int">
    delete from ssmbuild.books where bookID=#{bookID}
delete>

<update id="updateBook" parameterType="Books">
    update ssmbuild.books
    set bookName = #{bookName},bookCounts = #{bookCounts},detail = #
    {detail}
    where bookID = #{bookID}
update>

<select id="queryBookById" resultType="Books">
    select * from ssmbuild.books
    where bookID = #{bookID}
select>

<select id="queryAllBook" resultType="Books">
    SELECT * from ssmbuild.books
select>
mapper>

7. 编写Service层的接口和实现类

接口：

package com.kuang.service;
import com.kuang.pojo.Books;
import java.util.List;
    //BookService:底下需要去实现,调用dao层
    public interface BookService {
    //增加一个Book
    int addBook(Books book);
    //根据id删除一个Book
    int deleteBookById(int id);
    //更新Book
    int updateBook(Books books);
    //根据id查询,返回一个Book
    Books queryBookById(int id);
    //查询全部Book,返回list集合
    List queryAllBook();
}
    

实现类：

package com.kuang.service;
        import com.kuang.dao.BookMapper;
        import com.kuang.pojo.Books;
        import java.util.List;
public class BookServiceImpl implements BookService {
    //调用dao层的操作，设置一个set接口，方便Spring管理
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
    public int addBook(Books book) {
        return bookMapper.addBook(book);
    }
    public int deleteBookById(int id) {
        return bookMapper.deleteBookById(id);
    }
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }
    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }
    public List queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

到此，底层需求操作编写完毕！