狂神SSM框架整合思想及步骤springmvc

整合SSM框架

环境：

IDEA
MySQL8
Tomcat 9
Maven 3.6

前置知识：mysql数据库，spring，javaweb，mybatis

在这里插入图片描述

1、创建数据库

CREATE DATABASE `ssmbuild`;
 
 USE `ssmbuild`;
 
 DROP TABLE IF EXISTS `books`;
 
CREATE TABLE `books`(
`bookID` INT NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT 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');

2、基本环境搭建

新建一个maven项目！ ssmbuild ，添加web支持

导入相关pom依赖

<!--    junit,数据库驱动，连接池、servlet,jsp,mybatis-spring,spring -->
    <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>
        <!--        lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>

、build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>

建立项目基本结构和配置框架

com.hwt.pojo
com.hwt.dao
com.hwt.service
com.hwt.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"
       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">
 
 </beans>

3、Mybatis编写

数据库配置文件 database.properties

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

IDEA关联数据库
编写mybatis的核心配置文

<?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-->
    <typeAliases>
        <package name="com.hwt.pojo"/>
    </typeAliases>
<!--    注册-->
    <mappers>
        <mapper class="com.hwt.dao.BookMapper"/>
    </mappers>

</configuration>

编写实体类Books

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

编写Dao层的 Mapper接口！

public interface BookMapper {
      
      

    //增加一本书
    int addBook(Books books);
    //删除一本书
    int deleteBookId(int id);
    //更新一本书
    int updateBook(Books books);
    //查询一本书
    Books queryBookById(int id);
    //查询全部的书
    List<Books> queryAllBook();
}

编写接口对应的 Mapper.xml 文件

<?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.hwt.dao.BookMapper">
    <insert id="addBook" parameterType="books">
        insert into books (bookName, bookCounts, detail)
        VALUE (#{bookName},#{bookCounts},#{detail})
    </insert>

    <update id="updateBook" parameterType="books">
        update books
        set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
        where bookID = ${bookID}
    </update>

    <delete id="deleteBookId" parameterType="int">
        delete from books where bookID = #{bookId}
    </delete>

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

    <select id="queryAllBook" resultType="books">
        select * from books;
    </select>
</mapper>

编写Service层的接口和实现类

接口：

public interface BookService {
      
      
    //增加一本书
    int addBook(Books books);
    //删除一本书
    int deleteBookId( int id);
    //更新一本书
    int updateBook(Books books);
    //查询一本书
    Books queryBookById( int id);
    //查询全部的书
    List<Books> queryAllBook();
}

实现类：

<?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.hwt.dao.BookMapper">
    <insert id="addBook" parameterType="books">
        insert into books (bookID, bookName, bookCounts, detail)
        VALUE (#{bookName},#{bookCounts},#{detail})
    </insert>

    <update id="updateBook" parameterType="books">
        update books
        set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
    </update>

    <delete id="deleteBookId" parameterType="int">
        delete from books where bookID = #{bookId}
    </delete>

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

    <select id="queryAllBook" resultType="books">
        select * from books;
    </select>
</mapper>

4、Spring编写

配置Spring整合MyBatis，数据源使用c3p0连接池；

<?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. 关系数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--    2. 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}"/>

        <!-- 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>


    <!--    配置dao接口扫描包，动态的实现了dao接口可以注入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.hwt.dao"/>
    </bean>

</beans>

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" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

<!--    配置数据源-->
    <typeAliases>
        <package name="com.hwt.pojo"/>
    </typeAliases>
<!--    注册-->
    <mappers>
        <mapper class="com.hwt.dao.BookMapper"/>
    </mappers>

</configuration>

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下的包-->
    <context:component-scan base-package="com.hwt.service"/>
<!--    1. 将所有的业务类，注入到spring，可以通过配置，或者注解实现-->
    <bean id="BookServiceImpl" class="com.hwt.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
<!--    2. 声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--    3. 注入数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
<!--    4. aop事务支持-->

</beans>

Spring就是一个大杂烩，一个容器

5、SpringMVC层

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">

<!--    DispatchServlet-->
    <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:spring-mvc.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-->
    <filter>
        <filter-name>ecodingFilter</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>ecodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
<!--    session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

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">

    <!--1.注解驱动-->
    <mvc:annotation-driven/>
    <!--2.静态资源过虑-->
    <mvc:default-servlet-handler/>
    <!--3.扫描包:controller-->
    <context:component-scan base-package="com.hwt.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>

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"
       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">

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

6、业务实现

6.1、查询书籍

编写 BookController 类

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

    //查询全部书籍并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model){
      
      
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list",list);
        return "allBook";
    }
}

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>

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>书籍展示</title>
    <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 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>
                </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>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

</div>
</body>
</html>

问题bean不存在

排错步骤：

查看bea注入是否成功

Junit单元测试，查看代码是否能查询到结果

问题，有可能是spring出现问题

SpringMVC，整合的时候没调用我们的service层的bean

applicationContext.xml没有注入bean

web.xml中我们也绑定过配置文件！！！但是配置的是spring-mvc，这个里面趋势没有service bean，所以才会报错

6.2、添加书籍

增加添加书籍按钮

<div class="row">
    <div class="col-md-4 column">
        <%-- toAddBook  --%>
        <a href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
    </div>
</div>

编写跳转添加书籍方法

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

编写添加书籍页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>添加书籍</title>
    <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>

编写添加书籍方法

//添加书籍
@RequestMapping("/addBook")
public String addBook(Books books){
      
      
    System.out.println("addBook=>"+books);
    bookService.addBook(books);
    return "redirect:/book/allBook";//重定向到@RequestMapping("/allBook")请求
}

6.3、修改书籍

需要通过隐藏域获取 id 的值来修改

添加操作修改的超链接

<td>
      <a href="${pageContext.request.contextPath}/book/toUpdate/?id=${book.bookID}">修改</a>
</td>

编写跳转修改页面的类

//跳转到修改页面
@RequestMapping("toUpdate")
public String toUpdatePaper(int id,Model model){
      
      
    Books books = bookService.queryBookById(id);
    model.addAttribute("books",books);
    return "updateBook";
}

编写修改页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <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="${pageContext.request.contextPath}/book/updateBook" method="post">
        <input type="hidden" name="bookID" value="${books.bookID}">
        <div class="form-group">
            <label>书籍名称: </label>
            <input type="text" name="bookName" class="form-control" value="${books.bookName}" required>
        </div>
        <div class="form-group">
            <label>书籍数量: </label>
            <input type="text" name="bookCounts" class="form-control" value="${books.bookCounts}" required>
        </div>
        <div class="form-group">
            <label>书籍描述: </label>
            <input type="text" name="detail" class="form-control" value="${books.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>
    </form>

</div>
</body>
</html>

编写修改方法

//修改书籍
@RequestMapping("/updateBook")
public String updateBook(Books books){
      
      
    System.out.println("updateBook=>"+books);
    bookService.updateBook(books);
    return "redirect:/book/allBook";
}

6.4、删除数据

添加删除数据的超链接

<td>
    <a href="${pageContext.request.contextPath}/book/toUpdate/?id=${book.bookID}">修改</a>
    &nbsp;|&nbsp;
    <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
</td>

编写删除数据的方法

//删除书籍
@RequestMapping("/deleteBook/{bookId}")
public String deleteBook(@PathVariable("bookId") int id){
    bookService.deleteBookId(id);
    return "redirect:/book/allBook";
}

6.4、新增搜索

修改前端页面增加搜索功能

<div class="row">
    <div class="col-md-4 column">
        <%-- toAddBook  --%>
        <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/allBook">显示全部书籍</a>

    </div>
    <div class="col-md-4 column">
        <%-- 查询书籍--%>
        <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float:right" class="form-inline">
            <span style="color: red; font-weight: bold">${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>

dao层增加搜索方法配置文件编写sql语句

Books queryBookName(String bookName);

</select>
<select id="queryBookName" resultType="books">
    select * from books where bookName = #{bookName}
</select>

service层增加方法

Books queryBookName(String bookName);

@Override
public Books queryBookName(String bookName) {
      
      
    return bookMapper.queryBookName(bookName);
}

控制层编写查询方法

//查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
      
      
    Books books = bookService.queryBookName(queryBookName);

    ArrayList<Books> list = new ArrayList<>();
    list.add(books);

    if (books==null){
      
      
        list = (ArrayList<Books>) bookService.queryAllBook();
        model.addAttribute("error","未查到");
    }

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