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整合SSM小Demo（图书管理）

2021-02-01 18:32:41 作者：互联网

整合SSM小Demo(图书管理)

1、环境准备

IDEA
Tomcat 9.0.41
MySQL 8.0.22
Maven 3.6
spring，mybatis等

2、创建数据库

创建一个存放书籍的表

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');

3、项目基本框架的搭建

1、新建一个maven项目，并为其添加web支持

2、在核心配置文件 pom.xml 中导入你所需要的环境

<!--依赖：junit、数据库驱动、连接池、servlet、jsp、mybatis、mybatis-spring、spring、Lombok-->
<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>8.0.22</version>
    </dependency>

    <!--数据库连接池-->
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.2</version>
    </dependency>

    <!--servlet-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>

    <!--jsp-->
    <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、连接spring-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>

    <!--spring-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.3</version>
    </dependency>

    <!--Lombok-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.16</version>
    </dependency>
</dependencies>

3、在核心配置文件中加入build配置以解决静态资源导出问题

<!--静态资源导出问题-->
<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>

4、建立项目的基本结构和配置

基本架构

dao层处理数据
service层调用dao层，组合dao
pojo实体类，属性名要和数据库中属性名一致
controller层去进行具体业务的操作

项目配置文件

mybatis-config.xml 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>
    
</configuration>

applicationContext.xml spring的核心配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

4、分层次编写

Mybatis层

1.数据库核心配置文件 database.properties

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

注意！

这里如果是使用MySQL5版本的话，driver应为com.mysql.jdbc.Driver，且MySQL8版本需增加时区判定问题&serverTimezone=GMT，将时区定为Asia/Shanghai或GMT,UTC都可。

2.使用IDEA连接数据库，同样需要注意时区问题

3.编写MyBatis的核心配置文件 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>

    <!--设置日志-->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    
    <!--配置数据源交给spring去做-->
    <typeAliases>
        <package name="com.hsy.pojo"/>
    </typeAliases>

    <!--将BookMapper绑定到配置文件里-->
    <mappers>
        <mapper class="com.hsy.dao.BookMapper"/>
    </mappers>

</configuration>

4.编写数据库所对应的实体类pojo.Books

这里使用lombok插件（懒人专属）

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 BookMapper

import com.hsy.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;

public interface BookMapper {

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

    //删除一本书
    int deleteBookByID(@Param("bookID") int id);

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

    //查询一本书
    Books queryBookByID(@Param("bookID") int id);

    //查询所有书
    List<Books> queryAllBooks();

    //搜索框查询书籍
    Books queryBookByName(@Param("bookName") String bookName);

}

6.编写接口对应的配置文件，并在这里编写sql语句 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.hsy.dao.BookMapper">

    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail)
        value (#{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="queryAllBooks" resultType="Books">
        select * from ssmbuild.books
    </select>

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

7.dao层编写完毕后，这时需要编写service层的接口和实现类，以调用dao层

BookService接口

import com.hsy.pojo.Books;
import java.util.List;

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
    Books queryBookByID(int id);

    //查询所有书
    List<Books> queryAllBooks();

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

BookServiceImpl实现类

import com.hsy.dao.BookMapper;
import com.hsy.pojo.Books;
import java.util.List;

public class BookServiceImpl implements BookService{
    
    //service层调dao层：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> queryAllBooks() {
        return bookMapper.queryAllBooks();
    }

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

到这里mybatis层就编写完毕了。

spring层

1.配置Spring整合MyBatis，这里数据源使用c3p0连接池；

2.编写spring整合dao层的配置文件 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">

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

    <!--2.连接池
        dbcp:半自动，不能自动连接
        c3p0：自动操作（自动加载配置文件、自动设置到对象中）
        druid：德鲁伊
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <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.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis的配置文件-->
        <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-->
    <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.hsy.dao"/>
    </bean>
    
</beans>

3.spring整合service层 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
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 1.扫描service相关的包 -->
    <context:component-scan base-package="com.hsy.service"/>

    <!--2.将所有的业务类注入到spring中-->
    <bean id="bookServiceImpl" class="com.hsy.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

    <!--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.aop事务支持（这里暂时用不到）-->

</beans>

到这里spring层就编写完毕了

springMVC层

1.配置web依赖 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">

    <!--dispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <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>

    <!--乱码过滤器-->
    <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>

2.配置springMVC的核心配置文件 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
       http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://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-->
    <context:component-scan base-package="com.hsy.controller"/>

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

</beans>

3.将spring所有的配置文件整合到spring核心配置文件中 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-mvc.xml"/>
    <import resource="spring-service.xml"/>

</beans>

配置文件就到这里，还剩下controller中具体操作的代码以及前端界面还没有写。

controller层及前端界面

1.controller方法一：查询全部书籍

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

    //查询全部书籍，并返回到一个书籍展示界面
    @RequestMapping("/allBooks")
    public String list(Model model){
        List<Books> books = bookservice.queryAllBooks();
        model.addAttribute("list",books);
        return "allBooks";
    }

2.首页 index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
    <style>
      a{
        text-decoration: none;
        color: black;
        font-size: 18px;
      }
      h3{
        width: 180px;
        height: 38px;
        margin: 100px auto;
        text-align: center;
        line-height: 38px;
        background: deepskyblue;
        border-radius: 5px;
      }
    </style>
  </head>
  <body>
  <h3>
    <a href="${pageContext.request.contextPath}/book/allBooks">进入书籍界面</a>
  </h3>
  </body>
</html>

效果如下：

在这里插入图片描述

3.然后是书籍列表的界面 allBooks.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示页面</title>
    <%--BootStrap美化页面--%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">

    <div class="row clearfix">

        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍列表 —— 显示所有书籍</small>
                </h1>
            </div>
        </div>

        <div class="row">
            <div class="col-md-4 column">
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBooks">显示全部书籍</a>
            </div>

            <div class="col-md-8 column">
                <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
                    <span style="color: red;font-weight: bold">${error}</span>
                    <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称~">
                    <input type="submit" value="查询" class="btn btn-primary">
                </form>
            </div>
        </div>

    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">

                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                        <th>操作</th>
                    </tr>
                </thead>

                <%--从数据库中把书查询出来通过list遍历：    C:foreach--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

</body>
</html>

效果如下：

在这里插入图片描述

4.controller方法二：添加书籍

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

    //添加书籍的请求
    @RequestMapping("/addBook")
    public String addBook(Books books){
        bookservice.addBook(books);
        return "redirect:/book/allBooks";//重定向到@RequestMapping("/allBooks")请求
    }

5.添加书籍的界面 addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <%--BootStrap美化页面--%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">

    <div class="row clearfix">

        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>

    </div>

    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label>书籍名称：</label>
            <input type="text" name="bookName" class="form-control" required>
        </div>
        <div class="form-group">
            <label>书籍数量：</label>
            <input type="text" name="bookCounts" class="form-control" required>
        </div>
        <div class="form-group">
            <label>书籍描述：</label>
            <input type="text" name="detail" class="form-control" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="添加">
        </div>
    </form>
    
</div>

</body>
</html>

效果如下：

在这里插入图片描述

6.controller方法三：修改（更新）书籍

//跳转到修改书籍的界面
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(int id,Model model){
        Books books = bookservice.queryBookByID(id);
        model.addAttribute("queryBook",books);
        return "updateBook";
    }

    //修改书籍的请求
    @RequestMapping("/updateBook")//这里使用传统风格传参
    public String updateBook(Books books){
        bookservice.updateBook(books);
        return "redirect:/book/allBooks";
    }

7.修改书籍的界面 updateBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <%--BootStrap美化页面--%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">

    <div class="row clearfix">

        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>

    </div>

    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">

        <%--前端传递bookID隐藏域--%>
        <input type="hidden" name="bookID" value="${queryBook.bookID}">

        <div class="form-group">
            <label>书籍名称：</label>
            <input type="text" name="bookName" class="form-control" value="${queryBook.bookName}" required>
        </div>
        <div class="form-group">
            <label>书籍数量：</label>
            <input type="text" name="bookCounts" class="form-control" value="${queryBook.bookCounts}" required>
        </div>
        <div class="form-group">
            <label>书籍描述：</label>
            <input type="text" name="detail" class="form-control" value="${queryBook.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>
    </form>
    
</div>
</body>
</html>

效果如下：

在这里插入图片描述

8.controller方法四：删除书籍

//删除书籍的请求
    @RequestMapping("/deleteBook/{bookID}")//这里使用Restful风格传参
    public String deleteBook(@PathVariable("bookID") int id){
        bookservice.deleteBookByID(id);
        return "redirect:/book/allBooks";
    }

5、实现搜索框依据书名查询书籍功能

1.首先我们需要在前端展示所有书籍的界面添加一个搜索框和查询按钮

<div class="col-md-8 column">
    <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
        <span style="color: red;font-weight: bold">${error}</span>
        <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称~">
        <input type="submit" value="查询" class="btn btn-primary">
    </form>
</div>

2.先写底层代码，在mapper中添加一个接口

//搜索框查询书籍
    Books queryBookByName(@Param("bookName") String bookName);

3.接口写完了，我们需要在配置文件里把sql语句补上

<select id="queryBookByName" resultType="Books">
    select * from ssmbuild.books where bookName=#{bookName}
</select>

4.dao层写完了，这时我们去写service层

//搜索框查询书籍
    Books queryBookByName(String bookName);

5.然后写service的实现类

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

6.最后我们去写controller层的具体操作

//查询书籍的请求
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
    Books books = bookservice.queryBookByName(queryBookName);
    List<Books> list =new ArrayList<Books>();
    list.add(books);

    if (books==null){
        list=bookservice.queryAllBooks();
        model.addAttribute("error","未查到您想查询的书籍");
    }

    model.addAttribute("list",list);
    return "allBooks";
}

到这里这个web小demo就算完成了~

这时候我们可以配置tomcat然后运行项目就可以啦！

6、写在后面

第一个SSM整合案例，完成了增删改查的基本操作，这是一个非常底层，基础的项目，我们可以在这个项目的基础上完善自己的知识面，增加扩展更多的功能，使其成为一个非常强大的网站。其实学到这里才算真正入了后台开发的门，后面还有很长的路要走。作为一个刚转专业到计算机的大二小白，我深切的感受到了计算机的强大，同时也在不停地激励自己努力变强。这个demo虽然非常的简单，功能也不全面，但却是认认真真敲下来的，在这里要感谢“狂神说JAVA”，课讲得非常nice~学到了很多，接下来就是多花些时间，争取不看任何资料熟练地把这个项目完整地给敲出来，相信会有非常大的收获。

这是我的第一篇博客，希望大家不喜勿喷叭，多多支持~其实平常也记了很多的笔记，就是太懒了想不起来发出来（手动狗头）

标签：int,Demo,bookName,public,SSM,Books,books,书籍,图书
来源： https://blog.csdn.net/qq_47436772/article/details/113526128