[Java知识库]图书管理(SSM)

一:前言

这仅仅是个小demo,体验了一把SSM配置地狱，就简单的实现CRUD

二:相关技术

Mybatis+Spring+SpringMVC+Mysql+Maven+Tomcat

三:功能展示

1:查询

2:增加

3:删除

4：修改

四:上码

1：导入依赖

<?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>ssmbuild</artifactId>
    <version>1.0-SNAPSHOT</version>

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

    <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>1.18.10</version>
        </dependency>

    </dependencies>

  

</project>

2:Maven的资源过滤

zaipom.xml中进行添加

 <!--资源过滤-->
    <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>

3:基本结构框架

(1):Dao层

a:BookMapper

package com.wyj.Dao;

import com.wyj.Pojo.Books;

import java.util.List;

public interface BookMapper {

    //增加一本书
    int addBook(Books books);

    //根据id删除一个book
    int deleteBook(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<Books> queryBooks();

    List<Books> queryBooksById(int id);

}

b:BookMapper.xml

<?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.wyj.Dao.BookMapper">

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

    <delete id="deleteBook" parameterType="_int">
        delete from books
        where id = #{id}
    </delete>

    <update id="updateBook" parameterType="books">
        update books
        <set>
            <if test="bookName != null">
                bookName = #{bookName},
            </if>

            <if test="bookCounts != null">
                bookCounts = #{bookCounts},
            </if>

            <if test="detail != null">
                detail = #{detail},
            </if>
        </set>
        where id = #{id}
    </update>

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

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

    <select id="queryBooksById" parameterType="_int" resultType="books">
        select * from books where id = #{id}
    </select>

</mapper>

(2):PoJo

package com.wyj.Pojo;

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

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int id;
    private String bookName;
    private int bookCounts;
    private String detail;
}

(3):Service层

业务层 调用dao层完成实际的业务

a:bookService

package com.wyj.Service;

import com.wyj.Pojo.Books;

import java.util.List;

public interface BookService {
    //增加一本书
    int addBook(Books books);

    //根据id删除一个book
    int deleteBook(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<Books> queryBooks();
	
    List<Books> queryBooksById(int id);
}

b:bookServiceImpl

package com.wyj.Service;

import com.wyj.Dao.BookMapper;
import com.wyj.Pojo.Books;

import java.util.List;

public class BookServiceImp implements BookService{

    private BookMapper bookMapper;

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

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

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

    @Override
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

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

    @Override
    public List<Books> queryBooks() {
        return bookMapper.queryBooks();
    }

    @Override
    public List<Books> queryBooksById(int id) {
        return bookMapper.queryBooksById(id);
    }
}

(4):Controller层

Servlet在这里填写 响应前端的请求

package com.wyj.Controller;

import com.wyj.Pojo.Books;
import com.wyj.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 org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    @Autowired//这个是属性注入当中 自动装配 他仅仅限于如果这个属性是一个类的话
    @Qualifier("BookServiceImpl")//如果其注册的bean 有多个的话，其可以指定其中的一个bean
    private BookService bookService;

    @RequestMapping("/allBook")
    public String listBook(Model model) {
        List<Books> list = bookService.queryBooks();
        model.addAttribute("list",list);
        return "allBook";
    }

    //转发到addBook.jsp这个页面去添加书籍
    @RequestMapping("/toAddBook")
    public String toAddPaper() {
        return "addBook";
    }
    //当提交表单后 我们将这个页面重定向到 全部的书籍的页面
    //这里的参数 books 我们是从表单提交的时候（填写的参数）然后的话我们的提交方式
    //是post 所以参数看不见 ，但是我们仍可以从url中将参数获取到
    @RequestMapping("/addBook")
    public String addBooker(Books books) {
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }

    //修改书籍的请求(我们点击修改的操作的时候,在哪一行点击修改 我们就能获取到哪一行的
    //id信息,即可获取到这本书books;(我们是在url一行中可以获取到 id ,然后这个id参数我们就可以获取到
    // <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.id}">修改</a>
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Integer id, Model model) {
        Books books = bookService.queryBookById(id);
        model.addAttribute("Book",books);//我们向updateBook.jsp中的参数Book进行赋值
        return "updateBook";
    }
    //修改表单的提交  提交到这个请求中进行修改
    @RequestMapping("/updateBook")
    public String updateBook(Books books,Model model) {
        System.out.println(books);
        bookService.updateBook(books);
        System.out.println(books);
        Books books1 = bookService.queryBookById(books.getId());
        model.addAttribute("Book",books);
        return "redirect:/book/allBook";
    }

    //删除一个页面(这个参数id 我们从前端请求的jsp页面中的url 我们可以获取到id)
    @RequestMapping("/deleteBook")
    public String deleteBook(Integer id) {
        bookService.deleteBook(id);
        return "redirect:/book/allBook";
    }

    //根据书籍编号查询一本书籍的信息
    @RequestMapping("/CheckBookById")
    public String CheckBook(Integer id,Model model) {
        List<Books> list = bookService.queryBooksById(id);
        model.addAttribute("list",list);
        return "allBook";
    }


}

4:配置文件

(1):连接数据库

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/smbuild?useSSL=true&useUnicode=true&characterEncoding=UTF-8
jdbc.username=
jdbc.password=

(2):Mybatis-Config的配置文件

<?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.wyj.Pojo"/>
    </typeAliases>
	
	//每写完一个Mapper要在这里进行注册一下
    <mappers>
        <mapper class="com.wyj.Dao.BookMapper"/>
    </mappers>

</configuration>

(3):整合spring和mybatis

a:spring-dao.xml

<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-4.2.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.2.xsd">

    <!--配置整合Mybatis-->
    <!--1.关联数据库文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2.数据库连接池-->
    <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MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中
        在dao层中我们写完接口和配置文件后 还需要再写一个实现类(其中要手动引入sqlSessionFactory
        或者继承一个sqlSupport)然后在配置文件中注册bean,然后再测试中,CPX  getBean ....
        现在我们可以通过配置文件省略掉这个实现类
     -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--给出要扫描的Dao层接口包-->
        <property name="basePackage" value="com.wyj.Dao"/>
    </bean>
</beans>

b:spring-mvc.xml

我们用户发起的请求，以及响应我们用户的信息

<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-4.2.xsd
        http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
        http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-4.2.xsd">

     <!--扫描包:使指定的包下的注解有效-->
     <context:component-scan base-package="com.wyj.Controller"/>
     <!--静态资源默认servlet配置-->
     <mvc:default-servlet-handler/>
     <!--开启注解驱动-->
     <mvc:annotation-driven/>


    <!--配置视图解析器-->
    <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>

</beans>

c:spring-service.xml

<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-4.2.xsd
       http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-4.2.xsd">


       <!--扫描service层相关的bean-->
       <context:component-scan base-package="com.wyj.Service"/>

        <!--BookServiceImpl注入到IOC容器中-->
        <!--这里的ref = bookMapper ref是参考上下文  我们是将其中几个spring.xml联合在一块-->
        <bean id="BookServiceImpl" class="com.wyj.Service.BookServiceImp">
            <property name="bookMapper" ref="bookMapper"/>
        </bean>

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

d：将三个spring.xml整合到一块

<?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>