SSM框架：SSM整合

SSM框架：SSM整合

---

前言

狂神说

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SSM整合

0. 环境搭建

1、环境要求

环境：
IDEA
MySQL 5.7.19
Tomcat 9
Maven 3.6
要求：
需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

2、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');

3、基本环境搭建

1、新建一Maven项目！ssmbuild ， 添加web的支持
2、导入相关的pom依赖！

1、依赖

<dependencies>
    
    <dependency>
        <groupId>junitgroupId>
        <artifactId>junitartifactId>
        <version>4.12version>
    dependency>
    
    <dependency>
        <groupId>mysqlgroupId>
        <artifactId>mysql-connector-javaartifactId>
        <version>5.1.47version>
    dependency>
    
    <dependency>
        <groupId>com.mchangegroupId>
        <artifactId>c3p0artifactId>
        <version>0.9.5.2version>
    dependency>
 
    
    <dependency>
        <groupId>javax.servletgroupId>
        <artifactId>servlet-apiartifactId>
        <version>2.5version>
    dependency>
    <dependency>
        <groupId>javax.servlet.jspgroupId>
        <artifactId>jsp-apiartifactId>
        <version>2.2version>
    dependency>
    <dependency>
        <groupId>javax.servletgroupId>
        <artifactId>jstlartifactId>
        <version>1.2version>
    dependency>
 
    
    <dependency>
        <groupId>org.mybatisgroupId>
        <artifactId>mybatisartifactId>
        <version>3.5.2version>
    dependency>
    <dependency>
        <groupId>org.mybatisgroupId>
        <artifactId>mybatis-springartifactId>
        <version>2.0.2version>
    dependency>
 
    
    <dependency>
        <groupId>org.springframeworkgroupId>
        <artifactId>spring-webmvcartifactId>
        <version>5.1.9.RELEASEversion>
    dependency>
    <dependency>
        <groupId>org.springframeworkgroupId>
        <artifactId>spring-jdbcartifactId>
        <version>5.1.9.RELEASEversion>
    dependency>
dependencies>

3、Maven资源过滤设置

2、静态资源导出问题

<build>
    <resources>
        <resource>
            <directory>src/main/javadirectory>
            <includes>
                <include>**/*.propertiesinclude>
                <include>**/*.xmlinclude>
            includes>
            <filtering>falsefiltering>
        resource>
        <resource>
            <directory>src/main/resourcesdirectory>
            <includes>
                <include>**/*.propertiesinclude>
                <include>**/*.xmlinclude>
            includes>
            <filtering>falsefiltering>
        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

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

applicationContext.xml

<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>

底层

1. SSM整合：Mybatis层

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
jdbc.username=root
jdbc.password=123456

2、IDEA关联数据库

3、编写MyBatis的核心配置文件

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、编写数据库对应的实体类 com.kuang.pojo.Books

使用lombok插件！

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、编写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；

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 
<mapper namespace="com.kuang.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" resultType="Books">
        select * from ssmbuild.books
        where bookID = #{bookID}
    select>
 
    
    <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();
    }
}

到此，底层需求操作编写完毕！

整合dao和service层

2. SSM整合：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

<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">
 
    
    
    <context:property-placeholder location="classpath:database.properties"/>
 
    
    
    <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}"/>
        
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        
        <property name="autoCommitOnClose" value="false"/>
        
        <property name="checkoutTimeout" value="10000"/>
        
        <property name="acquireRetryAttempts" value="2"/>
    bean>
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        
        <property name="dataSource" ref="dataSource"/>
        
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    bean>
    
    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        
        <property name="basePackage" value="com.kuang.dao"/>
    bean>
beans>

3、Spring整合service层

<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">
 
    
    <context:component-scan base-package="com.kuang.service" />
 
    
    <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    bean>
    
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        
        <property name="dataSource" ref="dataSource" />
    bean>
beans>

Spring层搞定！再次理解一下，Spring就是一个大杂烩，一个容器！

前后端交互控制器（servlet作用）

3. SSM整合：SpringMVC层

1、web.xml

<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">
 
    
    <servlet>
        <servlet-name>DispatcherServletservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        <init-param>
            <param-name>contextConfigLocationparam-name>
              
            <param-value>classpath:applicationContext.xmlparam-value>
        init-param>
        <load-on-startup>1load-on-startup>
    servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServletservlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>
    
    <filter>
        <filter-name>encodingFilterfilter-name>
        <filter-class>
            org.springframework.web.filter.CharacterEncodingFilter
        filter-class>
        <init-param>
            <param-name>encodingparam-name>
            <param-value>utf-8param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>encodingFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>
    
    
    <session-config>
        <session-timeout>15session-timeout>
    session-config>
    
web-app>

2、spring-mvc.xml

<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">
 
    
    
    <mvc:annotation-driven />
    
    <mvc:default-servlet-handler/>
 
    
    <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>
    
    <context:component-scan base-package="com.kuang.controller" />
beans>

3、Spring配置整合文件，applicationContext.xml

<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>

基本配置文件，OK！

Controller 和 视图层编写

4. SSM整合：查询书籍功能

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">
    
    <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>

问题：bean不存在
步骤：
1.查看这个bean注入是否成功 看实现类左侧栏是否有小叶子可以跳转
2.Junit单元测试，看我们的代码是否能够查询出来结果 test取bean
3.上面两个没问题的话，问题就一定不在底层，是spring出了问题
4.SpringMVC整合的时候没调用到service层的bean
4.1. applicationContext.xml没有注入bean
4.2. web.xml读取到spring-mvc，读取不到spring整合的底层（没读到spring-service，读不到spring-dao）

5. SSM整合：添加书籍功能

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">
    
    <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. SSM整合：修改删除书籍

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">
    
    <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！

到目前为止，这个SSM项目整合已经完全的OK了，可以直接运行进行测试！这个练习十分的重要，大家需要保证，不看任何东西，自己也可以完整的实现出来！

项目结构图

这里的事务被Spring托管，会自动提交

或者 aop提交事务

    
    
    
    
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        
        
        <tx:attributes>
            
            <tx:method name="*" propagation="REQUIRED"/>
        tx:attributes>
    tx:advice>

    
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.qia.dao.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    aop:config>

7. SSM整合：新增搜索功能

需求分析从上到下，代码实现从下到上

    @RequestMapping("/queryBookByName")
    public String queryBookByName(String queryBookName,Model model){
        System.out.println(queryBookName);
        List<Books> booksList = bookService.queryBookByName(queryBookName);
        System.out.println(booksList);

//        if (booksList == null){
//            booksList = bookService.queryAllBook();
//        model.addAttribute("error","error:null");
//        }

        model.addAttribute("list",booksList);
        return "allBook";
    }
···
```java
    List<Books> queryBookByName(@Param("bookName") String bookName);

    <select id="queryBookByName" resultType="Books">
        select distinct * from ssmbuild.books where bookName like concat("%",#{bookName},"%") or detail like concat("%",#{bookName},"%")
    select>

    List<Books> queryBookByName(String bookName);

    @Override
    public List<Books> queryBookByName(String bookName) {
        return bookMapper.queryBookByName(bookName);
    }

    <div class="row">
        <div class="col-md-4 column">
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增a>
        div>
        <div class="col-md-4 column">
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍a>
        div>
        <%-- 原来无法在同一行    --%>
        <%--    <div class="col-md-4 column" style="float: right">--%>
        <%--        <form action="/book/toQueryBookByName" method="post">--%>
        <%-- 法一 ： 搜索栏和提交按钮在同一行的方法一   --%>
        <%--    <div class="col-md-4 column" style="float: right">--%>
        <%--        <form action="/book/toQueryBookByName" method="post" style="display: flex;justify-content: center">--%>
        <%-- 法二 ： 搜索栏和提交按钮在同一行的方法二   --%>
        <div class="col-md-4 column" style="float: right">
            <form action="${pageContext.request.contextPath}/book/queryBookByName" method="post" class="form-inline">
                <span style="color: red;font-weight: bold">${error}span>
                <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍关键字">
                <input class="btn btn-primary" type="submit" value="查询">
            form>
        div>
    div>

bootstrap可视化布局

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小结及展望

前路漫漫，认真坚持最重要！