這個厲害了，ssm框架整合全過程，建議收藏起來好好看看

1.0 環境要求

IDEA
MySQL 5.7.19
Tomcat 9
Maven 3.6

1.1 數據庫

創建書籍數據庫表，包括書籍編號，書籍名稱，書籍數量以及書籍描述。

CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '書id',
`bookName` VARCHAR(100) NOT NULL COMMENT '書名',
`bookCounts` INT(11) NOT NULL COMMENT '數量',
`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,'從入門到放棄'),
(2,'MySQL',10,'從刪庫到跑路'),
(3,'Linux',5,'從進門到進牢');

1.2 基本環境搭建

新建一Maven項目！ssmbuild，添加web的支持
導入相關的pom依賴和maven資源過濾

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.fanjh</groupId>
    <artifactId>ssmbuild</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--導入依賴-->
    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <!--數據庫驅動-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

        <!-- 數據庫連接池 -->
        <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>1.18.12</version>
        </dependency>
    </dependencies>

    <!--靜態資源過濾問題-->
    <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>
</project>

注意：這裏導包之後記得查看project structure中有無相關包，一般要手動導入

建立基本結構和框架：

com.fanjh.pojo
com.fanjh.dao
com.fanjh.service
com.fanjh.controller
mybatis-config.xml

這裏給出最終結構

前端調用controller層， controller層調用service層，service層調用dao層

1.2 mybatis層編寫

數據庫配置文件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=fjhmysql

連接數據庫
編寫mybatis核心配置文件：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>
    <!--mybatis核心配置文件-->
    <!--配置數據源等交給spring去做，這裏主要別名和註冊映射-->

    <typeAliases>
        <package name="com.fanjh.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.fanjh.dao.BookMapper"/>
    </mappers>
</configuration>

編寫數據庫對應實體類：com.fanjh.pojo.Books
使用lombok插件

package com.fanjh.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;
}

緊接着編寫dao層的mapper接口

package com.fanjh.dao;

import com.fanjh.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;
//增刪改查方法
public interface BookMapper {
    int addBook(Books book);

    int deleteBookById(@Param("bookId") int id);

    int updateBook(Books book);

    Books queryBookById(@Param("bookId") int id);

    List<Books> queryAllBook();
}

馬上編寫接口對應的Mapper.xml文件（對應sql語句）, 需要註冊到mybatis.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.fanjh.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=#{bookName}, bookCounts=#{bookCounts}, detail=#{detail}
        where bookID=#{bookID};
    </update>

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

    <select id="queryAllBook" resultType="Books">
        select * FROM ssmbuild.books
    </select>
</mapper>

至此，搞定dao層，接下來業務層。

編寫Service層接口和實現類
接口：

package com.fanjh.service;

import com.fanjh.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;

public interface BookService {
    int addBook(Books book);

    int deleteBookById(int id);

    int updateBook(Books book);

    Books queryBookById(int id);

    List<Books> queryAllBook();
}

實現類：

package com.fanjh.service;

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

public class BookServiceImpl implements BookService {
    //service層調dao層
    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 book) {
        return bookMapper.updateBook(book);
    }

    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

可以看到，service層的方法都是直接調用dao層的方法，到此底層需求操作編寫完畢。

1.3 spring層

配置Spring整合MyBatis，這裏使用c3p0連接池。
編寫Spring整合MyBatis相關配置文件：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
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置整合mybatis-->

    <!--1.關聯數據庫文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2.連接池：
            dbcp：半自動化操作，不能自動連接
            c3p0：自動化操作（自動化的加載配置文件，並且可以自動設置到對象）
            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連接私有屬性-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 關閉連接後不自動commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 獲取連接超時時間 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 當獲取連接失敗重試次數 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!--3.sqlsessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入數據庫連接池 -->
        <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dao接口掃描包，動態的實現了Dao接口可以注入到spring容器中-->
    <!--以前要新建一個dao接口實現類，然後在spring中註冊實現類-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlsessionfactory即可-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要掃描的包-->
        <property name="basePackage" value="com.fanjh.dao"/>
    </bean>
</beans>

spring整合service層

<?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">

    <!--如果上面配置錯了，常會報錯：通配符很全面，但無法找到元素。。。的聲明-->

    <!--1.掃描service包-->
    <context:component-scan base-package="com.fanjh.service"/>

    <!--2.將我們所有的業務類，注入到spring，可以通過配置或註解實現@Service @Autowired-->
    <bean id="BookServiceImpl" class="com.fanjh.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

    <!--3.聲明式事務管理期-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入數據庫連接池-->
        <property name="dataSource" ref="datasource"/>
    </bean>
</beans>

至此，spring層搞定，spring就是個大容器，整合dao層和service層，也是實現了dao層和service層的分離——解耦。

1.4 springMVC層

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:applicationContext.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>

    <!--亂碼過濾-->
    <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過期時間-->
    <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: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
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置映射器、適配器、視圖解析器-->

    <!--1.註解驅動-->
    <mvc:annotation-driven/>
    <!--2.靜態資源過濾-->
    <mvc:default-servlet-handler/>
    <!--3.掃描包-->
    <context:component-scan base-package="com.fanjh.controller"/>
    <!--4.視圖解析器-->
    <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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--spring核心配置文件-->
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>

</beans>

至此，所有的配置文件暫告一段落，接下來編寫Controller和視圖層，Controller和視圖層交互，然後調用service層。

BookController類編寫，增刪改查書籍（Controller層的編寫需要實時對照視圖層）

package com.fanjh.controller;
import com.fanjh.pojo.Books;
import com.fanjh.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.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;

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

    //查詢所有書籍，並且返回要給書籍展示頁面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }

    //跳轉到增加書籍頁面
    @RequestMapping("/toAddBook")
    public String toAddBook(){

        return "addBook";
    }

    //添加書籍的請求
    @RequestMapping("/addBook")//執行完後，重定向到allbook頁面
    public String addBook(Books books){
        System.out.println("addBook=>" + books);
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }

    //跳轉到修改書籍頁面
    @RequestMapping("/toUpdate")
    public String toUpdateBook(int id, Model model){
        Books books = bookService.queryBookById(id);//根據id取到圖書
        model.addAttribute("Qbooks",books);//將圖書返回給前端

        return "updateBook";
    }

    //修改書籍
    //接收到前端傳來的數據，調用service層執行修改操作
    @RequestMapping("/updateBook")
    public String updateBook(Books books){
        System.out.println("updateBook=>" + books);
        bookService.updateBook(books);

        return "redirect:/book/allBook";
    }

    //刪除書籍
    @RequestMapping("/deleteBook/{bookId}")//restful風格
    public String deleteBook(@PathVariable("bookId") int id){
        bookService.deleteBookById(id);

        return "redirect:/book/allBook";
    }
}

編寫首頁index.jsp

<%--
  Created by IntelliJ IDEA.
  User: fjh990
  Date: 2020/11/7
  Time: 12:16
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
  <title>首頁</title>
  <style>
    a{
      text-decoration: none;
      color: gold;
      font-size: 50px;
    }
    h3{
      width:500px;
      height:80px;
      margin:500px auto;
      text-align: center;
      line-height: 80px;
      background: black;
      border-radius: 6px;
    }
  </style>
</head>
<body>

<h3>
  <a href="${pageContext.request.contextPath}/book/allBook">進入書籍頁面</a>
</h3>

</body>
</html>

新建三個.jsp文件：

allBook：顯示所有書籍
addBook：增加書籍
updateBook:修改書籍

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>書籍展示</title>

    <!-- 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>書籍列表——————顯示所有書籍</small>
                </h1>
            </div>
        </div>
        <%--增加書籍按鈕,點擊後跳到controller頁面，然後根據return值到addbook.jsp--%>
        <div class="row">
            <div class="col-md-4 column">
                <a class="btn btn:primary" href="${pageContext.request.contextPath}/book/toAddBook">新增書籍</a>
            </div>
        </div>

        <div class="row clearfix">
            <div class="col-md-12 column">
                <table class="table table-hover table-striped">
                    <thead>
                    <tr>
                        <th>書籍編號</th>
                        <th>書籍名稱</th>
                        <th>書籍數量</th>
                        <th>書籍詳情</th>
                        <th>操作</th>
                    </tr>
                    </thead>
                    <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">刪除</a>
                            </td>
                        </tr>
                    </c:forEach>
                    </tbody>
                </table>
            </div>
        </div>
    </div>
</div>
</body>
</html>

addBook.jsp:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增書籍</title>

    <!-- 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>新增書籍</small>
                </h1>
            </div>
        </div>
    </div>

    <%--點擊添加按鈕後，跳轉到/book/addBook執行添加操作（屬性名一定要一致）--%>
    <form action="${pageContext.request.contextPath}/book/addBook"
          method="post">
        書籍名稱：<input type="text" name="bookName" required><br><br><br>
        書籍數量：<input type="text" name="bookCounts" required><br><br><br>
        書籍詳情：<input type="text" name="detail" required><br><br><br>
        <input type="submit" value="添加">
    </form>
</div>

</body>
</html>

這裏拿增加書籍舉例梳理整個流程：

前端點擊新增書籍按鈕後，跳轉到controller找到/book/toAddBook，跳轉到toAddBook頁面
根據toAddBook頁面的return語句，拼接後找到/WEB-INF/jsp/addBook.jsp文件
根據頁面展示，填寫所要增加的書籍的內容
點擊“添加”按鈕，返回controller找到/book/addBook頁面，並傳回books信息
controller層調用service層執行增加書籍操作。
返回到顯示書籍頁面

updateBook.jsp:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改書籍</title>

    <!-- 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>修改書籍</small>
                </h1>
            </div>
        </div>

    </div>

    <%--我們提交了修改的sql請求，但是修改失敗，spring接管事務後不需要顯式的配置，不是事務問題
         看一下sql語句，能否執行成功:sql執行失敗
         前端傳遞隱藏域--%>

    <form action="${pageContext.request.contextPath}/book/updateBook"
          method="post">
        <input type="hidden" name="bookID" value="${Qbooks.bookID}">

        書籍名稱：<input type="text" name="bookName" value="${Qbooks.bookName}" required><br><br><br>
        書籍數量：<input type="text" name="bookCounts" value="${Qbooks.bookCounts}" required><br><br><br>
        書籍詳情：<input type="text" name="detail" value="${Qbooks.detail}" required><br><br><br>
        <input type="submit" value="修改">
    </form>
</div>

</body>
</html>

至此，整個項目整合完畢

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