ssm整合

数据库

建库

#建库 if not exists：判断有没有   default charset：默认字符集  collate utf8_general_ci：排序规则
create database if not exists ssm default charset utf8mb4 collate utf8mb4_general_ci;

建表

create table if not exists books(
    b_id int(11) not null auto_increment comment '书籍id',
    b_name varchar(64) not null comment '书名',
    b_describe varchar(200) comment '描述',
    b_content longtext comment '内容',
    primary key (b_id)
)engine=InnoDB default charset=utf8mb4 comment '书籍表';

创建web项目

配置

导包

<dependencies>

    <!-- 单元测试 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.3.5</version>
      <scope>test</scope>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
    <!-- 偷懒优化代码神器 -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.18</version>
      <scope>provided</scope>
    </dependency>

    <!--   一个一个导太麻烦，直接导入spring-webmvc包会将 aop、beans、context、core、web、webmvc等包一次导入    -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.5</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <!-- mybatis支持 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <!-- 数据库驱动   向下兼容，最新的没啥问题 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.23</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <!-- spring整合mybatis包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.6</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
    <!-- 阿里druid数据库连接池 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.5</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <!--  springjdbc支持 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.3.5</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    <!-- spring对事务的支持 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.3.5</version>
    </dependency>


  </dependencies>

pojo

@Setter
@Getter
@ToString
@AllArgsConstructor
@NoArgsConstructor
public class Books {

    private Integer bId;
    private String bName;
    private String bDescribe;
    private String bContent;

}

jdbc.properties

#名称与连接池字段命一样会报错  mysql8.0需要配置时区：serverTimezone=Asia/Shangh
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=123456

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>

    <settings>
        <!--   开启驼峰命名     -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    
    <typeAliases>
        <!-- 自动扫描pojo包,配置别名 -->
        <package name="com.qc.pojo"/>
    </typeAliases>

</configuration>

mapper

package com.qc.mapper;

import com.qc.pojo.Books;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @author c
 * @create: 2021-03-30 14:08
 */

@Repository
public interface BooksMapper {

    /**
     * 增加书籍
     */
    public int addBook(Books books);

    /**
     * 删除书籍
     */
    public int deleteBook(Integer bId);

    /**
     * 修改书籍
     */
    public int updateBook(Books books);

    /**
     * 根据书籍id查询书籍
     */
    public Books checkBook(Integer bId);

    /**
     * 查询所有书籍
     */
    public List<Books> allBook();

}

mapper.xml

<?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.qc.mapper.BooksMapper">

    <!--  增加书籍  -->
    <insert id="addBook" parameterType="Books">
        insert into books(b_id,b_name,b_describe,b_content) value(default,#{bName},#{bDescribe},#{bContent})
    </insert>

    <!-- 删除书籍   -->
    <delete id="deleteBook" parameterType="integer">
        delete from books
        <where>
            b_id = #{bId}
        </where>
    </delete>

    <!-- 修改书籍 -->
    <update id="updateBook" parameterType="Books">
        update books
        <set>
            <if test="bName!=null">b_name = #{bName},</if>
            <if test="bDescribe!=null">b_describe = #{bDescribe},</if>
            <if test="bContent!=null">b_content = #{bContent},</if>
        </set>
        <where>
            b_id = #{bId}
        </where>
    </update>

    <!-- 根据id查询书籍 -->
    <select id="checkBook" parameterType="integer" resultType="Books">
        select b_id,b_name,b_describe,b_content from books
        <where>
            b_id = #{bId}
        </where>
    </select>

    <select id="allBook" resultMap="allBook">
        select b_id,b_name,b_describe,b_content from books
    </select>

    <resultMap id="allBook" type="Books">

    </resultMap>


</mapper>

service

package com.qc.service;

import com.qc.pojo.Books;

import java.util.List;

/**
 * @author c
 * @create: 2021-03-30 16:12
 */
public interface BooksService {

    /**
     * 增加书籍
     */
    public int addBook(Books books);

    /**
     * 删除书籍
     */
    public int deleteBook(Integer bId);

    /**
     * 修改书籍
     */
    public int updateBook(Books books);

    /**
     * 根据书籍id查询书籍
     */
    public Books checkBook(Integer bId);

    /**
     * 查询所有书籍
     */
    public List<Books> allBook();


}

service 实现

package com.qc.service.impl;

import com.qc.mapper.BooksMapper;
import com.qc.pojo.Books;
import com.qc.service.BooksService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.List;

/**
 * @author c
 * @create: 2021-03-30 16:13
 */
@Service
//设置多个异常，出现这些异常就回滚事务
@Transactional(rollbackFor ={RuntimeException.class,Exception.class})
public class BooksServiceImpl implements BooksService {

    @Resource
    private BooksMapper booksMapper;

    @Override
    public int addBook(Books books) {
        return booksMapper.addBook(books);
    }

    @Override
    public int deleteBook(Integer bId) {
        return booksMapper.deleteBook(bId);
    }

    @Override
    public int updateBook(Books books) {
        return booksMapper.updateBook(books);
    }

    @Override
    //Transactional(readOnly = true)设置事务为只读
    @Transactional(readOnly = true)
    public Books checkBook(Integer bId) {
        return booksMapper.checkBook(bId);
    }

    @Override
    @Transactional(readOnly = true)
    public List<Books> allBook() {
        return booksMapper.allBook();
    }
}

spring-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 加入context、aop、tx 约束 -->
    
    <!-- 加载jdbc.properties配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 配置druid数据库链接池 只配置了基本，如需其他功能，百度-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" >
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!-- spring整合mybatis后，由spring来创建sqlSessionFactoryBean -->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" >
        <!-- 需要连接池，注入我们上面配置的连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 加载mybatis配置文件 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 加载mapper文件 /*.xml:匹配所有的mapper.xml-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!-- 配置mapper在那个包 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.qc.mapper"/>
    </bean>

    <!--  开启扫描注解，扫描所有包下的注解  mapper在上面配置了，所以不用扫描，web快在mvc配置里单独扫描-->
    <context:component-scan base-package="com.qc.service"/>

    <!--  配置声明式事务  -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--  开启事务注解  -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

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:mvc="http://www.springframework.org/schema/mvc"
       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/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 开启注解驱动 -->
    <mvc:annotation-driven>
        <!-- 返回json会乱码，处理乱码 -->
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="defaultCharset" value="utf-8"/>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

        <!--静态资源过滤-->
    <mvc:default-servlet-handler/>

    <!-- 单独扫描controller包下的注解 -->
    <context:component-scan base-package="com.qc.controller"/>

    <!--  试图解析器:配置了这个 在controller只需要输入html(jsp等)名称，就会自动补全为：/WEB-INF/jsp/xx.jsp -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- web.xml初始化了这个文件，但是没有初始化spring-config.xml 我们导入它，程序在初始化的时候就会去加载 -->
    <import resource="spring-config.xml"/>


</beans>

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"
         metadata-complete="true">
  <!-- 注册DispatcherServlet -->
  <servlet>
    <servlet-name>ssm</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--  init-param:初始化参数   配置springmvc的配置文件，在启动的时候初始化  -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <!--  启动级别  -->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <!-- 接管所有请求 -->
  <servlet-mapping>
    <servlet-name>ssm</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- 默认的配置DispatcherServlet屏蔽了html页面的访问，如果需要使用html你需要加上如下： -->
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.html</url-pattern>
  </servlet-mapping>

  <!-- 编码过滤 -->
  <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>

</web-app>

controller

package com.qc.controller;

import com.qc.pojo.Books;
import com.qc.service.BooksService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

/**
 * @author c
 * @create: 2021-03-30 16:07
 */
@Controller
public class BooksController {

    //注入booksService 用@Resource好像比@Autowired好一点（谁知道呢）
    @Resource
    private BooksService booksService;

    /**
     * 
     * @param books
     * @return String
     * 增加书籍
     */
    @PostMapping("/addBook")
    @ResponseBody
    public String addBook(Books books){
        int i = booksService.addBook(books);
        if (i<0){return "增加失败";}
        return "成功";
    }

    /**
     * @param bId
     * @return String
     * restfull风格
     * 删除书籍
     */
    @PostMapping("/deleteBook/{bId}")
    @ResponseBody
    public String deleteBook(@PathVariable Integer bId){
        int i = booksService.deleteBook(bId);
        if (i<0){return "删除失败";}
        return "删除成功";
    }

    /**
     * @param books
     * @return String
     * 修改书籍
     */
    @PostMapping("/updateBook")
    @ResponseBody
    public String updateBook(Books books){
        int i = booksService.updateBook(books);
        if (i<0){return "修改失败";}
        return "修改成功";
    }

    /**
     * @param bId
     * @return Books
     * restfull风格
     * 根据id查询书籍信息
     */
    @RequestMapping("/checkBook/{bId}")
    @ResponseBody
    public String checkBook(@PathVariable Integer bId){
        Books books = booksService.checkBook(bId);
        return books.toString();
    }

    
    /**
     * @param model
     * @return List<Books></>
     * 查询所有书籍信息
     */
    @RequestMapping("/allBook")
    public String checkBook(Model model){
        List<Books> books = booksService.allBook();
        System.out.println(books);
        model.addAttribute("books",books);
        return "list";
    }


}

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${books}
</body>
</html>

结果

懒得整了，就这样。