第一个SSM框架

1、pom.xml

<?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.qing</groupId>
    <artifactId>ssm-build</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!--依赖-->
    <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>8.0.24</version>
        </dependency>
        <!-- 数据库连接池 -->
        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <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>1.18.6</version>
        </dependency>
    </dependencies>
    <!--    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>
</project>

2、配置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>
    <!--    配置数据源，交给spring做-->
    <typeAliases>
        <package name="com.qing.pojo"/>
    </typeAliases>
    <mappers>
        <mapper class="com.qing.mapper.BookMapper"/>
    </mappers>
</configuration>

3、配置database.properties数据源

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=qing
#如果mysql8出现时区问题则添加下面一行
#serverTimezone=Asia/Shanghai&

4、配置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 关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>
    <!--2 连接池 c3p0
    dbcp:半自动化操作 不能自动连接
    c3p0:自动化操作 自动加载配置文件，并可以自动设置到对象中
    druid:
    hikari:
    -->
    <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}"/>
    </bean>
    <!--3 sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <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dao接口可以注入到Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--    要扫描的包-->
        <property name="basePackage" value="com.qing.mapper"/>
    </bean>
</beans>

5、配置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">
    <!--1 扫描service相关的bean -->
    <context:component-scan base-package="com.qing.service" />
    <!--2 BookServiceImpl注入到IOC容器中-->
    <bean id="BookServiceImpl" class="com.qing.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
    <!--3 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>

6、配置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: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
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--1 注解驱动 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 -->
    <context:component-scan base-package="com.qing.controller"/>
    <!--2 静态资源过滤 让Spring MVC不处理静态资源 .css .js .html等-->
    <mvc:default-servlet-handler />
    <!--3 支持mvc注解驱动-->
    <mvc:annotation-driven />
    <!--4 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

7、整合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="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

8、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.注册DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--关联一个applicationContext.xml配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <!--启动级别-1-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--/ 匹配所有的请求；（不包括.jsp）-->
    <!--/* 匹配所有的请求；（包括.jsp）-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--解决乱码-->
    <filter>
        <filter-name>encoding</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>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--设置session15分钟过期-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

9、注意事项

（1）打开项目结构，点击Modules，选择项目下的Spring，查看四个配置文件是否都在ApplicationContext下

（2）Spring的三个配置文件必须整合到一起，使用import标签存放到一个applicationContext.xml中

（3）web.xml中注册DispatcherServlet时必须关联applicationContext.xml配置文件，这样才能加载所有的bean，包括service层的

10、Java代码

9.1 实体类

User实体类：

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;
}

9.2 mapper（dao）层

BookMappe接口：

public interface BookMapper {
    //增加一本书
    int addBook(Books book);
    //删除一本书
    int deleteBook(@Param("bookId") int id);
    //修改一本书
    int updateBook(Books books);
    //查询一本书
    Books queryBookById(@Param("bookId") int id);
    //查询所有
    List<Books> queryAllBook();
    //通过名字查询书籍
    Books queryBookByName(@Param("bookName") String bookName);
}

BookMapper.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">
<mapper namespace="com.qing.mapper.BookMapper">
   <insert id="addBook" parameterType="Books">
       insert into ssmbuild.books(bookName, bookCounts, detail)
       VALUES(#{bookName},#{bookCounts},#{detail})
   </insert>
    <delete id="deleteBook" 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="queryBookByName" resultType="Books">
        select * from ssmbuild.books where bookName=#{bookName};
    </select>
    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books
    </select>
</mapper>

9.3 service层

BookService接口：

import com.qing.pojo.Books;
import java.util.List;
public interface BookService {
    //增加一本书
    int addBook(Books book);
    //删除一本书
    int deleteBook(int id);
    //修改一本书
    int updateBook(Books books);
    //查询一本书
    Books queryBookById(int id);
    //查询所有
    List<Books> queryAllBook();
    //通过名字查询书籍
    Books queryBookByName(String bookName);
}

BookServiceImpl实现类：

import com.qing.mapper.BookMapper;
import com.qing.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService {
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
    public BookMapper getBookMapper() {
        return bookMapper;
    }
    @Override
    public int addBook(Books book) {
        return bookMapper.addBook(book);
    }
    @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> queryAllBook() {
        return bookMapper.queryAllBook();
    }
    @Override
    public Books queryBookByName(String bookName) {
        return bookMapper.queryBookByName(bookName);
    }
}

9.4 controller层

BookController：

import com.qing.pojo.Books;
import com.qing.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;
@Controller
@RequestMapping("/book")
public class BookController {
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;
    @RequestMapping("/allBook")
    //查询全部书籍并返回页面
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }
    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddBook() {
        return "AddBook";
    }
    //添加书籍请求
    @RequestMapping("/addBook")
    public String addBook(Books book) {
        if (book != null) {
            System.out.println("addBook->" + book.toString());
            bookService.addBook(book);
        }
        return "redirect:/book/allBook";
    }
    //跳转到修改页面
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(int id, Model model) {
        Books book = bookService.queryBookById(id);
        model.addAttribute("book", book);
        return "updateBook";
    }
    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books book) {
        System.out.println("updateBook->" + book);
        bookService.updateBook(book);
        return "redirect:/book/allBook";
    }
    //删除书籍
    @RequestMapping("/delBook/{bookID}")
    public String deleteBook(@PathVariable("bookID") int id) {
        System.out.println("delBook:" + bookService.queryBookById(id).toString());
        bookService.deleteBook(id);
        return "redirect:/book/allBook";
    }
    //查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName, Model model) {
        Books books = bookService.queryBookByName(queryBookName);
        if (books != null) {
            System.out.println("queryBookByName:" + books.toString());
            List<Books> list = new ArrayList<>();
            list.add(books);
            model.addAttribute("list", list);
            return "allBook";
        } else {
            System.out.println("结果为空！");
            List<Books> list = bookService.queryAllBook();
            model.addAttribute("list", list);
            model.addAttribute("error","未查到！");
            return "allBook";
        }
    }
}

11、前端代码

10.1 index.jsp系统主页

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
    <style>
      a{
        text-decoration: none;
        color: black;
      }
      h3{
        width: 180px;
        height: 38px;
        margin: 100px auto;
        text-align: center;
        line-height: 38px;
        background: darkgoldenrod;
        border-radius: 5px;
      }
    </style>
  </head>
  <body>
<h3>
  <a href="${pageContext.request.contextPath}/book/allBook">进入所有书籍页面</a>
</h3>
  </body>
</html>

10.2 allBook书籍主页

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>
    <!-- 新 Bootstrap 核心 CSS 文件 -->
    <link href="https://cdn.staticfile.org/twitter-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="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
            </div>
            <div class="col-md-4 column">
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示所有书籍</a>
            </div>
            <div class="col-md-4 column col-md-offset">
                <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: left">
                    <span style="color: red;font-weight: bold">${error}</span>
                    <input type="text" name="queryBookName" placeholder="请输入要查询的书籍名称" required>
                    <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>
                <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/delBook/${book.bookID}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>

10.3 AddBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>增加书籍</title>
    <link href="https://cdn.staticfile.org/twitter-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---新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" name="bookName" class="form-control" id="bookName" required>
        </div>
        <div class="form-group">
            <label for="bookCount">书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" id="bookCount" required>
        </div>
        <div class="form-group">
            <label for="bookDesc">书籍描述</label>
            <input type="text" name="detail" class="form-control" id="bookDesc">
        </div>
        <button type="submit" class="btn btn-default">添加</button>
    </form>
</div>
</body>
</html>