java框架----SSM快速整合教程

参考于遇见狂神说视频以及学习笔记

环境要求

• MySQL 5.7.19
• Tomcat 9
• Maven 3.6

项目目录

整合步骤

1. 搭建数据库

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');

2. 创建maven项目，并改为web项目

3. 编写pom文件，导入整合需要的依赖

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>ssm_build</artifactId>
    <version>1.0-SNAPSHOT</version>

    <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>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>
<!--    设置Maven资源过滤，否则读取不到配置文件-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <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>
        </resources>
    </build>
</project>

4.分层建立目录结构，编写Mybatis层

• 建立db.properties文件，配置数据库连接信息

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

• 编写实体类（POJO）

package com.wzl.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @Description
 * @autor wzl
 * @date 2022/8/25-21:18
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    
    
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

• 编写Mapper接口（Dao层）

package com.wzl.dao;

import com.wzl.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

/**
 * @Description
 * @autor wzl
 * @date 2022/8/25-21:34
 */
public interface BookMapper {
    
    
    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书 bookId需要与sql中的bookId变量名一致
    Books queryBookById(int id);

    //查询全部的书
    List<Books> queryAllBook();

    //查询书籍
    Books queryBookByName(String bookName);
}

• 编写接口对应的 Mapper.xml 文件。

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.wzl.dao.BookMapper">

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

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

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

    <select id="queryBookById" resultType="books">
        select * from books where bookID=#{
    
    book}
    </select>

    <select id="queryAllBook" resultType="books">
        select * from books
    </select>

    <select id="queryBookByName" resultType="books">
        select * from books where bookName=#{
    
    book}
    </select>
</mapper>

• 编写Service层的接口和实现类

package com.wzl.service;

import com.wzl.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

/**
 * @Description
 * @autor wzl
 * @date 2022/8/25-21:57
 */
public interface BookService {
    
    
    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById( int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书 bookId需要与sql中的bookId变量名一致
    Books queryBookById(int id);

    //查询全部的书
    List<Books> queryAllBook();

    //根据名字查书籍
    Books queryBookByName(String bookName);
}

package com.wzl.service;

import com.wzl.dao.BookMapper;
import com.wzl.pojo.Books;

import java.util.List;

/**
 * @Description
 * @autor wzl
 * @date 2022/8/25-21:58
 */
public class BookServiceImpl implements BookService {
    
    

    //组合Dao
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
    
    
        this.bookMapper = bookMapper;
    }

    public int addBook(Books books) {
    
    
        return bookMapper.addBook(books);
    }

    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<Books> queryAllBook() {
    
    
        return bookMapper.queryAllBook();
    }

    public Books queryBookByName(String bookName) {
    
    
        return bookMapper.queryBookByName(bookName);
    }
}

编写Spring层

• 编写Spring整合Mybatis的相关的配置文件（ spring-dao.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 配置整合mybatis -->
    <!-- 1.关联数据库文件 -->
    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 2.数据库连接池 -->
    <!--数据库连接池
    dbcp 半自动化操作 不能自动连接
    c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--        注入数据库连接池-->
        <property name="dataSource" ref="dataSource"/>
        <!--        配置Mybatis全局配置文件:mybatis-config.xml-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>

    </bean>
    <!--    配置扫描Dao接口包，动态实现Dao接口注入到spring容器中，获取是sqlsession对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.wzl.dao"/>
    </bean>
</beans>

• spring整合service层(编写spring-service.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"
       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">

<!--    扫描service相关的bean，对于service层-->
    <context:component-scan base-package="com.wzl.service"/>

    <bean id="BookServiceImpl" class="com.wzl.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

<!--    配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--        注入数据库连接池-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

编写spring-mvc层

• 编写web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <!--    DispatcherServlet-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--            这里加载的是总的配置文件-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>EncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--    Session过期时间-->

    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

• 编写spring-mvc.xml文件

<?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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--    配置SpringMvc,对于controller层-->

    <!--    1.开启SpringMvc注解驱动-->
    <mvc:annotation-driven/>
    <!-- 2.静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>

    <!--3.配置jsp显示viewResolver配置-->
    <bean 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>
        <!-- 4.扫描web相关的bean-->
        <context:component-scan base-package="com.wzl.controller"/>
</beans>

• 编写总体配置文件(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">

    <import resource="spring-dao.xml"/>
    <import resource="spring-service.xml"/>
    <import resource="spring-mvc.xml"/>
</beans>

编写Controller层

package com.wzl.controller;

import com.wzl.pojo.Books;
import com.wzl.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

/**
 * @Description
 * @autor wzl
 * @date 2022/8/26-9:15
 */
@Controller
@RequestMapping("/book")
public class BookController {
    
    
    //1.查询全部书籍

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询所有书籍
    @RequestMapping("/allBook")
    public String list(Model model){
    
    
        List<Books> books = bookService.queryAllBook();
        model.addAttribute("books",books);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddBook(){
    
    
        return "addBook";
    }

    //增加书籍
    @RequestMapping("/addBook")
    public String addBook(Books books){
    
    
        System.out.println(books);
        int i = bookService.addBook(books);
        if(i>0){
    
    
            System.out.println("新增书籍成功");
        }
        return "redirect:/book/allBook";
    }

    //跳转到修改书籍页面
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Model model,int id){
    
    
        Books books = bookService.queryBookById(id);
        System.out.println("书籍为:"+books);
        model.addAttribute("book",books);//将待修改的数据传递到前端
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books){
    
    
        System.out.println("updateBook==>"+books);
        int i = bookService.updateBook(books);
        if(i>0){
    
    
            System.out.println("修改成功");
        }

        return "redirect:/book/allBook";
    }

    //删除书籍
    @RequestMapping("delete/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id){
    
    
        int i = bookService.deleteBookById(id);
        if(i>0){
    
    
            System.out.println("删除成功");
        }
        return "redirect:/book/allBook";
    }

    //查询书籍
    //queryBookName与前端的name属性一致
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
    
    
        System.out.println("要查询的书籍名:"+queryBookName);

        Books book = bookService.queryBookByName(queryBookName.trim());
        System.out.println("查询后的书籍信息为："+book);
        List<Books> books=new ArrayList<Books>();
        //如果没有找到这本书
        if(book==null){
    
    
            books = bookService.queryAllBook();
            model.addAttribute("error","没有找到这本书");
        }
        books.add(book);
        model.addAttribute("books",books);
        return "allBook";
    }
}