ssm整合之底层搭建

ssm整合底层之底层搭建


开发工具与关键技术：作者：xq撰写时间：2020年10月18日

1、首先新建一个Maven项目，并添加web支持。

2、导入相关的pom依赖,代码：

<dependencies><!--Junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><!--数据库驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><!-- 数据库连接池 --><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.2</version></dependency><!--Servlet - JSP --><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!--Mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.2</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.2</version></dependency><!--Spring--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.1.9.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.1.9.RELEASE</version></dependency></dependencies>

3、Maven资源过滤设置

   <resource><directory>src/main/java</directory>

           <include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource>

4、建立基本结构和配置框架，如图：

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" ?>

   <package name="com.xq.pojo"/>

   <mapper resource="com/xq/dao/BookMapper.xml"/>

4、编写数据库对应的实体类 com.xq.pojo.Books

使用lombok插件！

package com.xq.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.xq.dao;

import com.xq.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 mapperPUBLIC "-//mybatis.org//DTD
Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.xq.dao.BookMapper"><!--增加一个Book--><insert id="addBook" parameterType="Books">insert into
ssmbuild.books(bookName,bookCounts,detail)values
(#{bookName}, #{bookCounts}, #{detail})</insert><!--根据id删除一个Book--><delete id="deleteBookById" parameterType="int">delete from
ssmbuild.books where bookID=#{bookID}</delete><!--更新Book--><update id="updateBook" parameterType="Books">update
ssmbuild.booksset
bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}where
bookID = #{bookID}</update><!--根据id查询,返回一个Book--><select id="queryBookById" resultType="Books">select *
from ssmbuild.bookswhere
bookID = #{bookID}</select><!--查询全部Book--><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.xq.service;

import com.xq.pojo.Books;

import java.util.List;

//BookService:底下需要去实现,调用dao层

public interface BookService {