SpringMVC:整合SSM

环境要求

环境:

  • IDEA
  • MySQL 5.7.19
  • Tomcat 9
  • Maven 3.6

要求:

  • 需要熟练掌握MySQL数据库,Spring,JavaWeb及MyBatis知识,简单的前端知识;

数据库环境

创建一个存放书籍数据的数据库表

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');

基本环境搭建

  1. 新建一Maven项目! ssmbuild , 添加web的支持
  2. 导入相关的pom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>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>
    </dependencies>
  3. Maven资源过滤设置

    <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. 建立基本结构和配置框架!

    • com.kuang.pojo
    • com.kuang.dao
    • com.kuang.service
    • com.kuang.controller
    • 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>
      
      </configuration>
    • 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">
      
      </beans>

Mybatis层编写

  1. 数据库配置文件 database.properties

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
    jdbc.username=root
    jdbc.password=123456
  2. IDEA关联数据库
  3. 编写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>
        
        <typeAliases>
            <package name="com.kuang.pojo"/>
        </typeAliases>
        <mappers>
            <mapper resource="com/kuang/dao/BookMapper.xml"/>
        </mappers>
    
    </configuration>
  4. 编写数据库对应的实体类 com.kuang.pojo.Books
    使用lombok插件!

    package com.kuang.pojo;
    
    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!

    package com.kuang.dao;
    
    import com.kuang.pojo.Books;
    import java.util.List;
    
    public interface BookMapper {
    
        //增加一个Book
        int addBook(Books book);
    
        //根据id删除一个Book
        int deleteBookById(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> queryAllBook();
    
    }
  6. 编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包;

    <?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.kuang.dao.BookMapper">
    
        <!--增加一个Book-->
        <insert id="addBook" parameterType="Books">
            insert into ssmbuild.books(bookName,bookCounts,detail)
            values (#{bookName}, #{bookCounts}, #{detail})
        </insert>
    
        <!--根据id删除一个Book-->
        <delete id="deleteBookById" parameterType="int">
            delete from ssmbuild.books where bookID=#{bookID}
        </delete>
    
        <!--更新Book-->
        <update id="updateBook" parameterType="Books">
            update ssmbuild.books
            set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
            where bookID = #{bookID}
        </update>
    
        <!--根据id查询,返回一个Book-->
        <select id="queryBookById" resultType="Books">
            select * from ssmbuild.books
            where bookID = #{bookID}
        </select>
    
        <!--查询全部Book-->
        <select id="queryAllBook" resultType="Books">
            SELECT * from ssmbuild.books
        </select>
    
    </mapper>
  7. 编写Service层的接口和实现类
    接口:

    package com.kuang.service;
    
    import com.kuang.pojo.Books;
    
    import java.util.List;
    
    //BookService:底下需要去实现,调用dao层
    public interface BookService {
        //增加一个Book
        int addBook(Books book);
        //根据id删除一个Book
        int deleteBookById(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> queryAllBook();
    }

实现类:

package com.kuang.service;

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

public class BookServiceImpl implements BookService {

    //调用dao层的操作,设置一个set接口,方便Spring管理
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
    
    public int addBook(Books book) {
        return bookMapper.addBook(book);
    }
    
    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();
    }
}

OK,到此,底层需求操作编写完毕!

Spring层

  1. 配置Spring整合MyBatis,我们这里数据源使用c3p0连接池;
  2. 我们去编写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:database.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 -->
        <!--解释 : https://www.cnblogs.com/jpfss/p/7799806.html-->
        <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.kuang.dao"/>
        </bean>
    
    </beans>
  3. Spring整合service层

    <?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 -->
        <context:component-scan base-package="com.kuang.service" />
    
        <!--BookServiceImpl注入到IOC容器中-->
        <bean id="BookServiceImpl" class="com.kuang.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>

Spring层搞定!再次理解一下,Spring就是一个大杂烩,一个容器!对吧!

SpringMVC层

  1. 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>DispatcherServlet</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>DispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
        <!--encodingFilter-->
        <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. 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
        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 -->
        <!-- 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>
    
        <!-- 4.扫描web相关的bean -->
        <context:component-scan base-package="com.kuang.controller" />
    
    </beans>
  3. Spring配置整合文件,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>

配置文件,暂时结束!Controller 和 视图层编写

  1. BookController 类编写 , 方法一:查询全部书籍

    @Controller
    @RequestMapping("/book")
    public class BookController {
    
        @Autowired
        @Qualifier("BookServiceImpl")
        private BookService bookService;
    
        @RequestMapping("/allBook")
        public String list(Model model) {
            List<Books> list = bookService.queryAllBook();
            model.addAttribute("list", list);
            return "allBook";
        }
    }
  2. 编写首页 index.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
    <!DOCTYPE HTML>
    <html>
    <head>
        <title>首页</title>
        <style type="text/css">
            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: 4px;
            }
        </style>
    </head>
    <body>
    
    <h3>
        <a href="${pageContext.request.contextPath}/book/allBook">点击进入列表页</a>
    </h3>
    </body>
    </html>
  3. 书籍列表页面 allbook.jsp

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>书籍列表</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 引入 Bootstrap -->
        <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>
    
        <div class="row">
            <div class="col-md-4 column">
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
            </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>书籍名字</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="${requestScope.get('list')}">
                        <tr>
                            <td>${book.getBookID()}</td>
                            <td>${book.getBookName()}</td>
                            <td>${book.getBookCounts()}</td>
                            <td>${book.getDetail()}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">更改</a> |
                                <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                    </tbody>
                </table>
            </div>
        </div>
    </div>
  4. BookController 类编写 , 方法二:添加书籍

    @RequestMapping("/toAddBook")
    public String toAddPaper() {
        return "addBook";
    }
    
    @RequestMapping("/addBook")
    public String addPaper(Books books) {
        System.out.println(books);
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }
  5. 添加书籍页面:addBook.jsp

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    
    <html>
    <head>
        <title>新增书籍</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 引入 Bootstrap -->
        <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">
            书籍名称:<input type="text" name="bookName"><br><br><br>
            书籍数量:<input type="text" name="bookCounts"><br><br><br>
            书籍详情:<input type="text" name="detail"><br><br><br>
            <input type="submit" value="添加">
        </form>
    
    </div>
  6. BookController 类编写 , 方法三:修改书籍

    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Model model, int id) {
        Books books = bookService.queryBookById(id);
        System.out.println(books);
        model.addAttribute("book",books );
        return "updateBook";
    }
    
    @RequestMapping("/updateBook")
    public String updateBook(Model model, Books book) {
        System.out.println(book);
        bookService.updateBook(book);
        Books books = bookService.queryBookById(book.getBookID());
        model.addAttribute("books", books);
        return "redirect:/book/allBook";
    }
  7. 修改书籍页面 updateBook.jsp

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>修改信息</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 引入 Bootstrap -->
        <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>修改信息</small>
                    </h1>
                </div>
            </div>
        </div>
    
        <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
            <input type="hidden" name="bookID" value="${book.getBookID()}"/>
            书籍名称:<input type="text" name="bookName" value="${book.getBookName()}"/>
            书籍数量:<input type="text" name="bookCounts" value="${book.getBookCounts()}"/>
            书籍详情:<input type="text" name="detail" value="${book.getDetail() }"/>
            <input type="submit" value="提交"/>
        </form>
    
    </div>
  8. BookController 类编写 , 方法四:删除书籍

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

配置Tomcat,进行运行!

到目前为止,这个SSM项目整合已经完全的OK了,可以直接运行进行测试!这个练习十分的重要,大家需要保证,不看任何东西,自己也可以完整的实现出来!

项目结构图

1570186854191.png

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小结及展望

这个是同学们的第一个SSM整合案例,一定要烂熟于心!

SSM框架的重要程度是不言而喻的,学到这里,大家已经可以进行基本网站的单独开发。但是这只是增删改查的基本操作。可以说学到这里,大家才算是真正的步入了后台开发的门。也就是能找一个后台相关工作的底线。

或许很多人,工作就做这些事情,但是对于个人的提高来说,还远远不够!

SpringMVC