6、整合SSM

环境:IDEA MySQL8.0.16 Tomcat8 Maven 3.*

要求:需要熟练掌握MySQL数据库,Spring,JavaWeb以及MyBatis只是,简单的前端知识

数据库环境

创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

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

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');

基本环境搭建

  1. 新建一个Maven项目!ssmbuild,添加web的支持

  2. 导入相关的pom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>
    
  3. 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>
    
  4. 建立基本结构和配置框架

  • com.kuang.pojo

  • com.kuang.dao

  • com.kuang.service

  • com.kuang.controller

  • mybatis-config.xml

    “`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
    <?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层编写

  1. 数据库配置文件 database.properties

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&setTimeZone=Aisa/Shanghai
    jdbc.username=root
    jdbc.password=rootroot
    
  2. IDEA关联数据库

  3. 编写MyBatis的核心配置文件

    <?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>
    
      <typeAliases>
          <package name="com.kuang.pojo"/>
      </typeAliases>
      <mappers>
          <mapper resource="com/kuang/dao/BookMapper.xml"/>
      </mappers>
    
    </configuration>
    
  4. 实体类
    package com.kuang.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;
    
    }
    
  5. Dao层的Mapper接口
    package com.kuang.dao;
    
    import com.kuang.pojo.Books;
    import java.util.List;
    
    public interface BookMapper {
    
      //增加一个Book
      int addBook(Books book);
    
      //根据id删除一个Book
      int deleteBookById(int id);
    
      //更新Book
      int updateBook(Books books);
    
      //根据id查询,返回一个Book
      Books queryBookById(int id);
    
      //查询全部Book,返回list集合
      List<Books> queryAllBook();
    
    }
    
  6. 编写接口对应的Mapper.xml文件,需要导入MyBatis的包
    <?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.kuang.dao.BookMapper">
    
      <!--增加一个Book-->
      <insert id="addBook" parameterType="Books">
         insert into ssmbuild.books(bookName,bookCounts,detail)
         values (#{bookName}, #{bookCounts}, #{detail})
      </insert>
    
      <!--根据id删除一个Book-->
      <delete id="deleteBookById" parameterType="int">
         delete from ssmbuild.books where bookID=#{bookID}
      </delete>
    
      <!--更新Book-->
      <update id="updateBook" parameterType="Books">
         update ssmbuild.books
         set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
         where bookID = #{bookID}
      </update>
    
      <!--根据id查询,返回一个Book-->
      <select id="queryBookById" resultType="Books">
         select * from ssmbuild.books
         where bookID = #{bookID}
      </select>
    
      <!--查询全部Book-->
      <select id="queryAllBook" resultType="Books">
         SELECT * from ssmbuild.books
      </select>
    
    </mapper>
    
  7. 编写Service层的接口和实现类

    接口:

    package com.kuang.service;
    
    import com.kuang.pojo.Books;
    
    import java.util.List;
    
    //BookService:底下需要去实现,调用dao层
    public interface BookService {
      //增加一个Book
      int addBook(Books book);
      //根据id删除一个Book
      int deleteBookById(int id);
      //更新Book
      int updateBook(Books books);
      //根据id查询,返回一个Book
      Books queryBookById(int id);
      //查询全部Book,返回list集合
      List<Books> queryAllBook();
    }
    

    实现类:

    package com.kuang.service;
    
    import com.kuang.dao.BookMapper;
    import com.kuang.pojo.Books;
    import java.util.List;
    
    public class BookServiceImpl implements BookService {
    
      //调用dao层的操作,设置一个set接口,方便Spring管理
      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 books) {
          return bookMapper.updateBook(books);
     }
    
      public Books queryBookById(int id) {
          return bookMapper.queryBookById(id);
     }
    
      public List<Books> queryAllBook() {
          return bookMapper.queryAllBook();
     }
    }
    

Spring层

  1. 配置Spring整合MyBatis,我们这里数据源使用c3p0连接池;

  2. 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"?>
    <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">
    
      <!-- 配置整合mybatis -->
      <!-- 1.关联数据库文件 -->
      <context:property-placeholder location="classpath:database.properties"/>
    
      <!-- 2.数据库连接池 -->
      <!--数据库连接池
          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 并且设置到对象里面)
      -->
      <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.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>
    
      <!-- 4.配置扫描Dao接口包,动态实现Dao接口注入到spring容器中 -->
      <!--解释 :https://www.cnblogs.com/jpfss/p/7799806.html-->
      <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
          <!-- 注入sqlSessionFactory -->
          <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
          <!-- 给出需要扫描Dao接口包 -->
          <property name="basePackage" value="com.kuang.dao"/>
      </bean>
    
    </beans>
    
  3. 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相关的bean -->
      <context:component-scan base-package="com.kuang.service" />
    
      <!--BookServiceImpl注入到IOC容器中-->
      <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
          <property name="bookMapper" ref="bookMapper"/>
      </bean>
    
      <!-- 配置事务管理器 -->
      <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
          <!-- 注入数据库连接池 -->
          <property name="dataSource" ref="dataSource" />
      </bean>
    
    </beans>
    

SpringMVC层

  1. 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">
    
      <!--DispatcherServlet-->
      <servlet>
          <servlet-name>DispatcherServlet</servlet-name>
          <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
          <init-param>
              <param-name>contextConfigLocation</param-name>
              <!--一定要注意:我们这里加载的是总的配置文件,之前被这里坑了!-->  
              <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>
    
      <!--encodingFilter-->
      <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过期时间-->
      <session-config>
          <session-timeout>15</session-timeout>
      </session-config>
    
    </web-app>
    
  2. 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">
    
      <!-- 配置SpringMVC -->
      <!-- 1.开启SpringMVC注解驱动 -->
      <mvc:annotation-driven />
      <!-- 2.静态资源默认servlet配置-->
      <mvc:default-servlet-handler/>
    
      <!-- 3.配置jsp 显示ViewResolver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>
    
      <!-- 4.扫描web相关的bean -->
      <context:component-scan base-package="com.kuang.controller" />
    
    </beans>
    3、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">
    
      <import resource="spring-dao.xml"/>
      <import resource="spring-service.xml"/>
      <import resource="spring-mvc.xml"/>
    
    </beans>
    

配置文件,暂时结束!Controller和视图层编写

  1. BookController类编写,方法一:查询全部书籍
    @Controller
    @RequestMapping("/book")
    public class BookController {
    
      @Autowired
      @Qualifier("BookServiceImpl")
      private BookService bookService;
    
      @RequestMapping("/allBook")
      public String list(Model model) {
          List<Books> list = bookService.queryAllBook();
          model.addAttribute("list", list);
          return "allBook";
     }
    }
    
  2. 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>
    
  3. 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>书籍列表</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 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>书籍列表 —— 显示所有书籍</small>
                  </h1>
              </div>
          </div>
      </div>
    
      <div class="row">
          <div class="col-md-4 column">
              <a class="btn btn-primary" href="{pageContext.request.contextPath}/book/toAddBook">新增</a>
          </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="{requestScope.get('list')}">
                      <tr>
                          <td>{book.getBookID()}</td>
                          <td>{book.getBookName()}</td>
                          <td>{book.getBookCounts()}</td>
                          <td>{book.getDetail()}</td>
                          <td>
                              <a href="{pageContext.request.contextPath}/book/toUpdateBook?id={book.getBookID()}">更改</a> |
                              <a href="{pageContext.request.contextPath}/book/del/{book.getBookID()}">删除</a>
                          </td>
                      </tr>
                  </c:forEach>
                  </tbody>
              </table>
          </div>
      </div>
    </div>
    
  4. BookController类编写,方法二:添加书籍
    @RequestMapping("/toAddBook")
    public String toAddPaper() {
      return "addBook";
    }
    
    @RequestMapping("/addBook")
    public String addPaper(Books books) {
      System.out.println(books);
      bookService.addBook(books);
      return "redirect:/book/allBook";
    }
    
  5. 添加书籍页面:addBook.jsp
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    
    <html>
    <head>
      <title>新增书籍</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 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>新增书籍</small>
                  </h1>
              </div>
          </div>
      </div>
      <form action="${pageContext.request.contextPath}/book/addBook" method="post">
         书籍名称:<input type="text" name="bookName"><br><br><br>
         书籍数量:<input type="text" name="bookCounts"><br><br><br>
         书籍详情:<input type="text" name="detail"><br><br><br>
          <input type="submit" value="添加">
      </form>
    
    </div>
    
  6. BookController类编写,方法三:修改书籍
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Model model, int id) {
      Books books = bookService.queryBookById(id);
      System.out.println(books);
      model.addAttribute("book",books );
      return "updateBook";
    }
    
    @RequestMapping("/updateBook")
    public String updateBook(Model model, Books book) {
      System.out.println(book);
      bookService.updateBook(book);
      Books books = bookService.queryBookById(book.getBookID());
      model.addAttribute("books", books);
      return "redirect:/book/allBook";
    }
    
  7. 修改书籍页面 updateBook.jsp
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
      <title>修改信息</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <!-- 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>修改信息</small>
                  </h1>
              </div>
          </div>
      </div>
    
      <form action="{pageContext.request.contextPath}/book/updateBook" method="post">
          <input type="hidden" name="bookID" value="{book.getBookID()}"/>
         书籍名称:<input type="text" name="bookName" value="{book.getBookName()}"/>
         书籍数量:<input type="text" name="bookCounts" value="{book.getBookCounts()}"/>
         书籍详情:<input type="text" name="detail" value="${book.getDetail() }"/>
          <input type="submit" value="提交"/>
      </form>
    
    </div>
    
  8. BookController类编写,方法四:删除书籍
    @RequestMapping("/del/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id) {
      bookService.deleteBookById(id);
      return "redirect:/book/allBook";
    }
    

配置Tomcat,进行运行!

项目结构图

img

小结

这个SSM整合案例,一定要烂熟于心

SSM框架的重要程度是不言而喻的,学到这里,大家已经可以进行基本网站的单独开发。但是这只是增删改查的基本操作。可以说学到这里,大家才算是真正的步入了后台开发的门。也就是能找一个后台相关工作的底线。

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Source: github.com/k4yt3x/flowerhd
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