ssm整合（spring+springmvc+mybatis）做一个小项目（SpringMVC学习笔记六）

最新推荐文章于 2025-12-17 20:09:02 发布

原创最新推荐文章于 2025-12-17 20:09:02 发布 · 383 阅读

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文章标签：

#学习 #笔记 #oracle

一、mybatis层

1、搭建数据库：

//创建数据库
CREATE DATABASE `ssmbuild`; 

//选择数据库
USE `ssmbuild`

//检查如果数据库中有books这个表的话就给他删除
DROP TABLE IF EXISTS `books`

//创建表books
CREATE TABLE `books`(
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '图书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`)
)

//插入数据
INSERT INTO `books` 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、搭建maven项目

创建之后的目录：

在配置文件中导入需要用到的依赖

<!--需要的相关依赖-->
  <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>

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>

3、连接数据库

4、创建包结构和配置文件结构（目前够用的）

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-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>

database.properties

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

下面完成mybatis-config.xml的配置

<?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>
<!--数据源交给spring去做了，这里我们主要做取别名和映射一些mappers配置文件-->
    
<!--给pojo包下的所有类取别名-->
    <typeAliases>
        <package name="com.li.pojo"/>
    </typeAliases>
    
<!--映射等一下来做-->
</configuration>

5、编写实体类(pojo)和接口(dao)

因为要偷懒，在maven中导入lombok的依赖

<!--lombok-->
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.18.30</version>
      </dependency>

编写实体类

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

}

编写接口

package com.li.dao;


import com.li.pojo.Books;

import java.util.List;

public interface BookMapper {
    //增加一本书
    int addBook(Books books);

    //根据删除一本书
    int deleteBookByID(int id);
  
    //修改一本书
    int updateBook(Books books);

    //根据id查询一本书
    Books queryBookId(int id);
    
    //查询所有的书
    List<Books> queryAllBook();

}

编写xxxMapper.xml文件执行sql语句

头文件直接用mybatis-config.xml的改

修改后：

<?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>

</mapper>

编写sql语句

<?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.li.dao.BookMapper">

    <insert id="addBook" parameterType="books" >
        insert into ssmbuild.books(bookName,bookCounts,detail)
        values (#{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 = #{books},bookCounts = #{bookCounts},
            detail = #{detail}
        where bookID = #{bookID};
    </update>

    <select id="queryBookId" resultType="books" parameterType="int">
        select *
        from ssmbuild.books
        where bookID = #{bookID};
    </select>

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

写完sql语句后第一件事就是将xxxMapper.xml配置文件绑定到mybatis的配置文件中，两种绑定（映射）方式

<?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>
<!--数据源交给spring去做了，这里我们主要做取别名和映射一些mappers配置文件-->

<!--给pojo包下的所有类取别名-->
    <typeAliases>
        <package name="com.li.pojo"/>
    </typeAliases>

<!--映射等一下来做-->
    <mappers>
        <mapper resource="com/li/dao/BookMapper.xml"/>
    </mappers>

<!--    <mappers>-->
<!--        <mapper class="com.li.dao.BookMapper"/>-->
<!--    </mappers>-->

</configuration>

6、编写业务层（service）

package com.li.service;

import com.li.dao.BookMapper;
import com.li.pojo.Books;

import java.util.List;

public class BookServiceImp implements BookService{

    //service调dao层， 组合dao
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    //增加一本书
    public int addBook(Books books){
        return bookMapper.addBook(books);
    }

    //根据删除一本书
    public int deleteBookByID(int id){
        return bookMapper.deleteBookByID(id);
    }

    //修改一本书
    public int updateBook(Books books){
        return bookMapper.updateBook(books);
    }

    //根据id查询一本书
    public Books queryBookId(int id){
        return bookMapper.queryBookId(id);
    }

    //查询所有的书
    public List<Books> queryAllBook(){
        return bookMapper.queryAllBook();
    }


}

到这里mybatis层就基本的就写的差不多了

二、Spring层

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、关联数据库配置文件-->
<context:property-placeholder location="classpath:database.properties"/>

<!--2、连接池
dbcp  c3p0(这里用这个连接池，用之前需要先导入包，我们之前已经导入过了)  druid hikari
-->
    <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、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.xlm"/>
    </bean>

<!--4、配置dao接口扫描包,动态的实现了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"/>
<!--        需要扫描的dao包-->
        <property name="basePackage" value="com.li.dao"/>
    </bean>

</beans>

三、整合service层

编写spring整合service层的配置文件spring-service.xml

在注入所有的业务类时要将三个配置文件 spring-service.xml applicationContext.xml spring-dao.xml三个配置文件整合到一起

要不然会报错如下：

使用注解将所有业务类注入到Spring中

spring-service.xml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"
       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下的包-->
    <context:component-scan base-package="com.li.service"/>

<!--2.将我们的所有业务类,注入到Spring,可以通过配置,或者注解实现  这里用配置-->
    <bean id="BookServiceImp" class="com.li.service.BookServiceImp">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

<!--3.申明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--注入数据源        -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    </beans>

四、springmvc层

1、配置web.xml配置文件

<?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springmvc的配置文件:【servlet-name】-servlet.xml-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.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>
</web-app>

编写spring-mvc.xml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"
       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">
    <!-- 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.li.controller"/>
    <!-- 让Spring MVC不处理静态资源(静态资源过滤) -->
    <mvc:default-servlet-handler />
    <!--
    支持mvc注解驱动
        在spring中一般采用@RequestMapping注解来完成映射关系
        要想使@RequestMapping注解生效
        必须向上下文中注册DefaultAnnotationHandlerMapping
        和一个AnnotationMethodHandlerAdapter实例
        这两个实例分别在类级别和方法级别处理。
        而annotation-driven配置帮助我们自动完成上述两个实例的注入。
     -->
    <mvc:annotation-driven />
    <!-- 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>
    <!--这里是编写Controller类后注册的bean-->
<!--    <bean name="/h1" class="com.li.controller.ControllerTest1"/>-->
</beans>

到这里底层结构就差不多写完了

五、让Controller层和jsp交互起来

1、编写Controller类

package com.li.controller;

import com.li.pojo.Books;
import com.li.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.PatchMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {
    //Controller层调用 service层
    //为引用类型属性设置值
    @Autowired
    //为引用类型属性指定注入的bean
    @Qualifier("BookServiceImp")
    //设置全局变量
    private BookService bookService;

    //查询所有的书籍,并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model){
//        调用查询全部书籍方法
        List<Books> books = bookService.queryAllBook();
//        将得到的值返回给前端
        model.addAttribute("books:",books);

        return "allBook";
    }

}

2、编写返回的对应的前端页面和欢迎页跳转前端页面

首页跳转页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>首页</title>
</head>
<body>
<h2>
    <a href="${pageContext.request.contextPath}/book/allBook">进入书籍展示页面</a>
</h2>
</body>
</html>

前端页面

<%@ 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>
</head>
<body>
<h2>书籍展示</h2>
</body>
</html>

这里会报一个500的错

因为我们web.xml中关联spring配置文件的时候我们关联的是一部分配置文件，没有关联到总的配置文件

改成总配置文件就可以了

<?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springmvc的配置文件:【servlet-name】-servlet.xml-->
    <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>
  <!--解决乱码问题-->
  <filter>
    <filter-name>gen</filter-name>
    <filter-class>com.li.properties.GenericEncodingFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>gen</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

排错思路