·前言

　　刚通过视频学完mybatis、spring、springMVC，做了一个SSM框架的整合。此框架是结合了视频中老师的思路，按照自己的理解进行整合的。这是原出处：http://dwz.date/ac27。框架设计了一个图书表，并可以通过前端web页面对图书表进行增删改查等操作。由于没有前端基础，页面比较简陋。同时，代码不够规范，大小写格式没有按照规范来。希望以后可以注意到并改正。

·整合步骤：

（1）通过maven创建一个不使用模板的项目，设置GAV（groupId、artifactId、version），并把项目设置成web项目

（2）创建数据库 :

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

（3）导入依赖包，在pom.xml中配置：

<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>1.18.20</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.4</version>
        </dependency>
 </dependencies>

（4）设置静态资源过滤，在pom.xml中配置:

    <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>

（5）创建项目基本结构（创建每一层的包）：

　　entity、dao、service、controller

（6）创建基础框架配置：

　　　　1.在resources文件夹中创建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>

　　　　2.在resources文件夹中创建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>

（7）在resources文件夹中创建数据库配置文件 database.properties：

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuilduseSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123

（8）IDEA关联数据库

（9）编写实体类：在entity下创建Books类：

package com.zyf.entity;

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;

}

（10）编写dao层的BooksMapper接口：

    package com.zyf.dao;

    import com.zyf.entity.Books;
    import org.apache.ibatis.annotations.Param;
    import java.util.List;

    public interface BooksMapper {
        int addBooks(Books books);
        int deleteBooks(@Param("bookID") int id);
        int updateBooks(Books books);
        Books queryBooksById(@Param("bookID")int id);
        List<Books> queryAllBooks();
    }

（11）编写BooksMapper.xml实现接口BooksMapper：

<?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.zyf.dao.BooksMapper">
        <insert id="addBooks" parameterType="Books">
        insert into mybatis.books  values (#{bookID},#{bookName},#{bookCounts},#{detail});
        </insert>
        <delete id="deleteBooks" parameterType="int">
        delete from  mybatis.books where bookID=#{bookID};
        </delete>
        <update id="updateBooks" parameterType="Books">
        update mybatis.books set bookName = #{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookID=#{bookID};
        </update>
        <select id="queryBooksById" resultType="Books">
        select * from mybatis.books where bookID=#{bookID};
        </select>
        <select id="queryAllBooks" resultType="Books">
        select * from mybatis.books;
        </select>
    </mapper>

　　在编写该代码的时候，需要在resources/mybatis-config.xml中，定义别名以及注册该mapper.xml：

　　　　<typeAliases>
        　　<package name="com.zyf.entity"/>
       </typeAliases>

       <mappers>
        　<mapper resource="com/zyf/dao/BooksMapper.xml"/>
       </mappers>

 

（12）编写service层BooksService接口：

    package com.zyf.service;

    import com.zyf.entity.Books;
    import java.util.List;

    public interface BooksService {
        int addBooks(Books books);
        int deleteBooks(int id);
        int updateBooks(Books books);
        Books queryBooksById(int id);
        List<Books> queryAllBooks();
    }

（13）编写service层BooksService的实现类BooksServiceImpl：

        package com.zyf.service;

        import com.zyf.dao.BooksMapper;
        import com.zyf.entity.Books;
        import java.util.List;

        public class BooksServiceImpl implements BooksService{
            //调用dao层的操作，设置一个set接口，方便Spring管理
            private BooksMapper booksMapper;
            public void setBooksMapper(BooksMapper booksMapper){
            this.booksMapper=booksMapper;
            }

            public int addBooks(Books books) {
            return booksMapper.addBooks(books);
            }

            public int deleteBooks(int id) {
            return booksMapper.deleteBooks(id);
            }

            public int updateBooks(Books books) {
            return booksMapper.updateBooks(books);
            }

            public Books queryBooksById(int id) {
            return booksMapper.queryBooksById(id);
            }

            public List<Books> queryAllBooks() {
            return booksMapper.queryAllBooks();
            }
        }

（14）编写resources/applicationContext.xml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"
               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.关联数据库配置文件-->
            <context:property-placeholder location="classpath:database.properties"/>
            <!--2.注入数据库连接池-->
            <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <!--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,设置连接池和mybatis配置文件的位置-->
            <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
            </bean>
            <!--4.MapperScannerConfigurer 自动扫描 将Mapper接口生成代理注入到Spring-->
            <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="com.zyf.dao"/>
            </bean>
            <!--5.将BookServiceImpl注入到容器中-->
            <!--当使用注解的方式注入时候，需要加入扫描代码<context:component-scan base-package="com.zyf.service" />-->
            <bean id="BookServiceImpl" class="com.zyf.service.BooksServiceImpl">
            <property name="booksMapper" ref="booksMapper"/>
            </bean>
            <!--6.配置事务管理器-->
            <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
            </bean>
            <!--截止到6mybatis已经整合完毕，从7开始配置SpringMVC，即控制层以及请求等等的相关内容-->
            <!--7.开启springMVC注解驱动,并设置JSON为utf-8-->
            <mvc:annotation-driven>
            <mvc:message-converters>
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                    <value>text/html;charset=utf-8</value>
                    </list>
                </property>
                </bean>
            </mvc:message-converters>
            </mvc:annotation-driven>
            <!--8..静态资源默认servlet配置-->
            <mvc:default-servlet-handler/>
            <!--9.由于使用了注解所以需要扫描-->
            <context:component-scan base-package="com.zyf.controller"/>
            <!--10.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>

（15）编写web.xml配置：

　　　　<!--设置前端控制器-->
        <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>
        <!--设置过滤器，此为一个编码类型的设置-->
        <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>
        <!--设置一个session的过期时间-->
        <session-config>
        <session-timeout>15</session-timeout>
        </session-config>

（16）编写控制层BooksController：

　　　　package com.zyf.controller;

        import com.zyf.entity.Books;
        import com.zyf.service.BooksService;
        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.List;

        @Controller
        @RequestMapping("/Books")
        public class BooksController {
            @Autowired
            @Qualifier("BookServiceImpl")
            private BooksService booksService;

            @RequestMapping("/All")
            public String queryAllBooks(Model model) {
            List<Books> list = booksService.queryAllBooks();
            model.addAttribute("books", list);
            return "AllBooks";
            }
            @RequestMapping("/toAddBooks")
            public String toAddBooks() {
            //使用此方法，可以跳转到WEB-INF下面的jsp页面
            return "AddBooks";
            }
            @RequestMapping("/AddBooks")
            public String AddBooks(Books books) {
            System.out.println(books);
            booksService.addBooks(books);
            return "redirect:/Books/All";
            }
            @RequestMapping("/DeleteBooks/{bookID}")
            public String DeleteBooks(@PathVariable("bookID") int bookID) {
            booksService.deleteBooks(bookID);
            return "redirect:/Books/All";
            }
            @RequestMapping("/toUpdate")
            public String toUpdate(int id, Model model) {
            Books books = booksService.queryBooksById(id);
            model.addAttribute("books", books);
            return "UpdateBooks";
            }
            @RequestMapping("/UpdateBooks")
            public String UpdateBooks(Books books) {
            booksService.updateBooks(books);
            return "redirect:/Books/All";
            }
        }

（17）编写前端:1.主页面（index.jsp）：

            <%@ page contentType="text/html;charset=UTF-8" language="java" %>
            <html>
            <head>
                <title>$Title$</title>
            </head>
            <body>
            <a href="${pageContext.request.contextPath}/Books/All">查看所有书籍</a>
            </body>
            </html>

　　　　2.展示所有书籍页面（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>展示所有书籍</title>
            </head>
            <body>
            <p><a href="${pageContext.request.contextPath}/Books/toAddBooks">添加书籍</a></p>
            <table>
                <thead>
                <tr>
                <th>书籍编号</th>
                <th>书籍名字</th>
                <th>书籍数量</th>
                <th>书籍详情</th>
                <th>操作</th>
                </tr>
                </thead>
                <tbody>
                <c:forEach var="book" items="${books}">
                <tr>
                    <th>${book.bookID}</th>
                    <th>${book.bookName}</th>
                    <th>${book.bookCounts}</th>
                    <th>${book.detail}</th>
                    <th><a href="${pageContext.request.contextPath}/Books/toUpdate?id=${book.bookID}">修改</a>|<a
                        href="${pageContext.request.contextPath}/Books/DeleteBooks/${book.bookID}">删除</a></th>
                </tr>
                </c:forEach>
                </tbody>
            </table>
            </body>
            </html>

　　　　3.添加书籍页面（AddBooks.jsp）:

　　　　　　　　<%@ page contentType="text/html;charset=UTF-8" language="java" %>
            <html>
            <head>
                <title>添加书籍</title>
            </head>
            <body>
            <form action="${pageContext.request.contextPath}/Books/AddBooks" method="post">
                书籍名字：<input type="text" name="bookName"/><br>
                书籍数量：<input type="text" name="bookCounts"/><br>
                书籍详情：<input type="text" name="detail"/><br>
                <input type="submit" name="添加"/>
            </form>
            </body>
            </html>

　　　　4.修改书籍页面（UpdateBooks.jsp）:

            <%@ page contentType="text/html;charset=UTF-8" language="java" %>
            <html>
            <head>
                <title>Title</title>
            </head>
            <body>
            <form action="${pageContext.request.contextPath}/Books/UpdateBooks" method="post">
                <input type="hidden" name="bookID" value="${books.bookID}">
                书籍名字：<input name="bookName" type="text" value="${books.bookName}"><br>
                书籍数量：<input name="bookCounts" type="text" value="${books.bookCounts}"><br>
                书籍详情：<input name="detail" type="text" value="${books.detail}"><br>
                <input type="submit" name="修改">
            </form>
            </body>
            </html>

（18）打开project structure，把包导入

·初步创建项目后运行遇到的问题：

（1）applicationContext.xml的头没有写全
（2）最后添加了Jackson的包没有在project structure中添加
（3）空指针报错异常检查：web.xml配置的前段控制器绑定的配置文件是否包含了所有配置、控制层调用的service的接口是new出来的还是spring的，new出来的是错误的。