√ SSM - 怎么利用SSM框架从零实现CRUD

1. 配置pom.xml

• 导入依赖：Junit、数据库驱动、数据库连接池、Servlet-JSP、MyBatis、Spring、Lombok
• 导出静态资源

<?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>com.acai</groupId>
    <artifactId>SSM</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <!--1.导入依赖-->
    <dependencies>
        <!--(1)Junit-->
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <!--(2)数据库驱动-->
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

        <!--(3)数据库连接池-->
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.6</version>
        </dependency>

        <!--(4)Servlet-JSP-->
        <!-- https://mvnrepository.com/artifact/javax.servlet/servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--(5)MyBatis-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--(6)Spring-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.3</version>
        </dependency>

        <!--(7)Lombok-->
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
    </dependencies>

    <!--2.导出静态资源-->
    <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>

2. 连接数据库

(1) 连接MySQL

(2) 创建database、table

create database if not exists ssm;

use ssm;

create table if not exists book_info
(
    book_id    int(10) primary key auto_increment,
    book_name  varchar(100) not null,
    book_count int(10)      not null
) character set utf8;

3. 建立目录结构

• src/main/java/com/acai/pojo
• src/main/java/com/acai/dao
• src/main/java/com/acai/service
• src/main/java/com/acai/controller
• web/WEB-INF/page

4. 创建配置文件

• 均放在src/main/resources目录下

(1) 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>
    <!--1.配置日志功能-->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <!--2.给实体类添加别名-->
    <typeAliases>
        <package name="com.acai.pojo"/>
    </typeAliases>

    <!--3.绑定实体类的xxxMapper.xml-->
</configuration>

(2) 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
       https://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--1.关联dao、service、mvc配置文件-->
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

(3) database.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=false&useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456

(4) 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
       https://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2.配置数据库连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--3.配置sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--4.配置dao接口扫描包，动态实现将dao接口注入到spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--配置要扫描的包-->
        <property name="basePackage" value="com.acai.dao"/>
    </bean>
</beans>

(5) 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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       https://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://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">

    <!--1.扫描service包-->
    <context:component-scan base-package="com.acai.service"/>

    <!--2.将所有xxxServiceImpl注入到spring容器中-->

    <!--3.声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--4.配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--5.配置事务切入-->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.acai.dao.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
</beans>

(6) 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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       https://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.注解驱动-->
    <mvc:annotation-driven/>

    <!--2.静态资源过滤-->
    <mvc:default-servlet-handler/>

    <!--3.扫描controller包-->
    <context:component-scan base-package="com.acai.controller"/>

    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--配置前缀-->
        <property name="prefix" value="/WEB-INF/page/"/>
        <!--配置后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

5. 配置web.xml

<?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">

    <!--1.配置DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--绑定applicationContext.xml-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--2.配置乱码过滤-->
    <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>

    <!--3.配置session超时时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

6. 编写xxx类

package com.acai.pojo;

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

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Book {
    
    
    private Integer id;
    private String name;
    private Integer count;
}

7. 编写xxxMapper接口

package com.acai.dao;

import com.acai.pojo.Book;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapper {
    
    
    //增加一本书
    int addBook(Book book);

    //删除一本书
    int deleteBookById(@Param("bookId") int id);

    //修改一本书
    int updateBook(Book book);

    //通过ID查询书
    Book queryBookById(@Param("bookId") int id);

    //通过名称查询书
    List<Book> queryBookByName(@Param("bookName") String name);

    //查询所有书
    List<Book> queryAllBook();
}

8. 编写xxxMapper.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">
<!--1.绑定实体类的xxxMapper接口-->
<mapper namespace="com.acai.dao.BookMapper">
    <!--2.表字段映射到实体类属性-->
    <resultMap id="BookMap" type="Book">
        <id column="book_id" property="id"/>
        <id column="book_name" property="name"/>
        <id column="book_count" property="count"/>
    </resultMap>

    <!--3.SQL语句-->
    <!--增加一本书-->
    <insert id="addBook" parameterType="Book">
        insert into ssm.book_info (book_name, book_count)
        values (#{name}, #{count})
    </insert>

    <!--删除一本书-->
    <delete id="deleteBookById" parameterType="int">
        delete
        from ssm.book_info
        where book_id = #{bookId}
    </delete>

    <!--修改一本书-->
    <update id="updateBook" parameterType="Book">
        update ssm.book_info
        set book_name=#{name},
            book_count=#{count}
        where book_id = #{id}
    </update>

    <!--通过ID查询书-->
    <select id="queryBookById" resultMap="BookMap">
        select *
        from ssm.book_info
        where book_id = #{bookId}
    </select>

    <!--通过名称查询书-->
    <select id="queryBookByName" resultMap="BookMap">
        select *
        from ssm.book_info
        where book_name = #{bookName}
    </select>

    <!--查询所有书-->
    <select id="queryAllBook" resultMap="BookMap">
        select *
        from ssm.book_info
    </select>
</mapper>

9. 绑定xxxMapper.xml

• 绑定到mybatis-config.xml中

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

10. 编写xxxService接口

package com.acai.service;

import com.acai.pojo.Book;

import java.util.List;

public interface BookService {
    
    
    //增加一本书
    int addBook(Book book);

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

    //修改一本书
    int updateBook(Book book);

    //通过ID查询书
    Book queryBookById(int id);

    //通过名称查询书
    List<Book> queryBookByName(String name);

    //查询所有书
    List<Book> queryAllBook();
}

11. 编写xxxServiceImpl类

package com.acai.service;

import com.acai.dao.BookMapper;
import com.acai.pojo.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {
    
    
    //用于service层调dao层
    @Autowired
    private BookMapper bookMapper;

    //用于spring注入
    public void setBookMapper(BookMapper bookMapper) {
    
    
        this.bookMapper = bookMapper;
    }

    @Override
    public int addBook(Book book) {
    
    
        return bookMapper.addBook(book);
    }

    @Override
    public int deleteBookById(int id) {
    
    
        return bookMapper.deleteBookById(id);
    }

    @Override
    public int updateBook(Book book) {
    
    
        return bookMapper.updateBook(book);
    }

    @Override
    public Book queryBookById(int id) {
    
    
        return bookMapper.queryBookById(id);
    }

    @Override
    public List<Book> queryBookByName(String name) {
    
    
        return bookMapper.queryBookByName(name);
    }

    @Override
    public List<Book> queryAllBook() {
    
    
        return bookMapper.queryAllBook();
    }
}

12. 注入xxxServiceImpl类

• 在spring-service.xml注入到spring容器中

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

13. 编写xxxController类

package com.acai.controller;

import com.acai.pojo.Book;
import com.acai.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.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {
    
    
    //用于controller层调service层
    @Autowired
    @Qualifier("bookService")
    private BookService bookService;

    @RequestMapping("/toAddBook")
    public String toAddBook() {
    
    
        return "add_book";
    }

    @RequestMapping("/addBook")
    public String addBook(Book book) {
    
    
        bookService.addBook(book);
        return "redirect:/book/queryAllBook";
    }

    @RequestMapping("/deleteBook")
    public String deleteBook(int id) {
    
    
        bookService.deleteBookById(id);
        return "redirect:/book/queryAllBook";
    }

    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(int id, Model model) {
    
    
        Book book = bookService.queryBookById(id);
        model.addAttribute("book", book);
        return "update_book";
    }

    @RequestMapping("/updateBook")
    public String updateBook(Book book) {
    
    
        bookService.updateBook(book);
        return "redirect:/book/queryAllBook";
    }

    @RequestMapping("/queryBookByName")
    public String queryBookByName(String name, Model model) {
    
    
        List<Book> books = bookService.queryBookByName(name);
        if (books.size() != 0) {
    
    
            model.addAttribute("allBook", books);
            return "show_book";
        } else {
    
    
            return "redirect:/book/queryAllBook";
        }
    }

    @RequestMapping("/queryAllBook")
    public String queryAllBook(Model model) {
    
    
        List<Book> books = bookService.queryAllBook();
        model.addAttribute("allBook", books);
        return "show_book";
    }
}

14. 编写JSP页面

(1) show_book.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: acai
  Date: 2021/8/16
  Time: 11:45
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>图书管理系统</title>
</head>
<body>
<div align="center">
    <h1>
        图书列表
    </h1>
    <table style="width: 650px;height: 500px;text-align: center" border="1">
        <tr>
            <td colspan="5" align="right">
                <form action="${pageContext.request.contextPath}/book/queryBookByName" method="post">
                    <a href="${pageContext.request.contextPath}/book/toAddBook">新增图书</a>
                    <input type="text" name="name">
                    <input type="submit" value="查询">
                </form>
            </td>
        </tr>
        <tr>
            <th colspan="2" align="left">
                名称
            </th>
            <th align="left">
                数量
            </th>
            <th colspan="2">
                操作
            </th>
        </tr>
        <c:forEach var="book" items="${allBook}">
        <tr>
            <td colspan="2" align="left">
                    ${book.name}
            </td>
            <td align="left">
                    ${book.count}
            </td>
            <td colspan="2">
                <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.id}">修改</a>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <a href="${pageContext.request.contextPath}/book/deleteBook?id=${book.id}">删除</a>
            </td>
        </tr>
        </c:forEach>
</div>
</body>
</html>

(2) add_book.jsp

<%--
  Created by IntelliJ IDEA.
  User: acai
  Date: 2021/8/17
  Time: 15:01
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>图书管理系统</title>
</head>
<body>
<div align="center">
    <h2>
        新增图书
    </h2>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <table style="width: 300px;height: 200px;text-align: center" border="1">
            <tr>
                <td>
                    名称
                </td>
                <td>
                    <input type="text" name="name" required="true">
                </td>
            </tr>
            <tr>
                <td>
                    数量
                </td>
                <td>
                    <input type="text" name="count" required="true">
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="提交">
                    &nbsp;&nbsp;
                    <button onclick="window.location.href='${pageContext.request.contextPath}/book/queryAllBook'">
                        返回
                    </button>
                </td>
            </tr>
        </table>
    </form>
</div>
</body>
</html>

(3) update_book.jsp

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%--
  Created by IntelliJ IDEA.
  User: acai
  Date: 2021/8/17
  Time: 15:36
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>图书管理系统</title>
</head>
<body>
<div align="center">
    <h2>
        修改图书
    </h2>
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <input type="hidden" name="id" value="${book.id}">
        <table style="width: 300px;height: 200px;text-align: center" border="1">
            <tr>
                <td>
                    名称
                </td>
                <td>
                    <input type="text" name="name" value="${book.name}" required="true">
                </td>
            </tr>
            <tr>
                <td>
                    数量
                </td>
                <td>
                    <input type="text" name="count" value="${book.count}" required="true">
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="提交">
                    &nbsp;&nbsp;
                    <button onclick="window.location.href='${pageContext.request.contextPath}/book/queryAllBook'">
                        返回
                    </button>
                </td>
            </tr>
        </table>
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</div>
</body>
</html>