SSM整合_年轻人的第一个增删改查_基础环境搭建 - 蔚然丶丶 - 博客园

SSM整合_年轻人的第一个增删改查_基础环境搭建
 SSM整合_年轻人的第一个增删改查_查找
 SSM整合_年轻人的第一个增删改查_新增
 SSM整合_年轻人的第一个增删改查_修改
 SSM整合_年轻人的第一个增删改查_删除
GitHub：https://github.com/say-hey/ssm_crud
Gitee：https://gitee.com/say-hey/ssm_crud

有用吗？对于学完Spring、SpringMVC、Mybatis还无从下手的同学来说这是一个很好引子。对于正在学习同一个案例的同学，可能解决一些问题。对于需要这个案例的同学可以直接获取。

有什么？：xml配置文件编写，引入一个简单的前端框架，使用MyBatis Generator逆向工程生成一些代码，使用框架简单快速搭建一个页面，好用的分页工具PageHelper，简单的前后端分离，发送ajax请求，利用json传递数据，增、删、改、查的简单实现。

简单吗？内容很简单，涉及Java代码不多，但是对于新手来说，最困难的部分是各种环境搭建、配置文件、版本冲突，如果能够根据错误提示动手解决，那就是一大进步。

怎么学？如果有时间可以在B站搜索：ssm整合crud，雷丰阳讲的。如果想看到每个功能的实现过程和源码，可以在这里学习，每个步骤都有注释。也可以作为复习快速浏览。

什么样？如下图：

1、基础环境搭建

安装设置java、maven、mysql

设置编辑器UTF-8，Tomcat编码UTF-8

1. 创建Maven工程

properties

ssm_crud
    src
        main
        	java
        	resources
        	webapp
                WEB-INF
                	views
                	web.xml
                index.jsp
	pom.xml

2. 引入依赖jar

pom.xml

目前的依赖只保证基本功能，后续使用其他功能需要再引入依赖

tex

<?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.ssm</groupId>
    <artifactId>ssm_crud</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>ssm_crud Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <!-- 引入jar包 -->
    <!-- spring,springmvc,mybatis,数据库连接池c3p0,数据库驱动包 -->
    <dependencies>
        <!-- spring-webmvc 包含spring和springmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <!-- spring数据库驱动 spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <!-- spring面向切面编程 spring-aspects -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <!-- spring 单元测试 -->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.1.RELEASE</version>
            <scope>provided</scope>
        </dependency>

        <!-- MyBatis -->
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <!-- spring和mybatis整合 mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.3</version>
        </dependency>

        <!-- 数据库连接池 驱动，两个数据源配置名不同，需要注意 -->
        <!-- c3p0数据源 -->
        <!--老版 <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version> </dependency> -->
        <!--    <dependency>-->
        <!--      <groupId>com.mchange</groupId>-->
        <!--      <artifactId>c3p0</artifactId>-->
        <!--      <version>0.9.5.5</version>-->
        <!--    </dependency>-->

        <!--  druid数据源  -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!-- mysql-connector-java 注意:要和MySQL统一版本,MySQL5,MySQL8 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <!--     8.0.21       -->
            <version>8.0.18</version>
        </dependency>

        <!-- web项目其他包(jstl,servlet-api,junit) -->
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- Servlet api 是运行时需要,服务器中有,不需要打包,就配置<scope>provided</scope> -->
        <!-- servlet-api是3.0之前版本,java.servlet-api是3.0之后版本 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <!-- junit4测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!-- junit5测试-->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    <!--  idea创建maven项目自动生成  -->
    <build>
        <finalName>ssm_crud</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

3. 引入Bootstrap前端框架

Bootstrap官网下载：起步 · Bootstrap v3 中文文档 | Bootstrap 中文网 (bootcss.com)
webapp目录下创建static目录，将bootstrap-3.3.7-dist整个文件夹放入
在static目录下引入jquery-1.12.4.js文件

在webapp目录下的index.jsp中使用，只需要查看文档添加相应的class样式

properties

ssm_crud
    src
        main
        	java
        	resources
            webapp
            	static
            		bootstrap-3.3.7-dist
            		jquery-1.12.4.js
                WEB-INF
                	views
                    web.xml
                index.jsp
	pom.xml

jsp

<%-- 解决乱码 --%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<head>
    <script src="static/jquery-1.12.4.js"></script>
    <script src="static/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
    <link href="static/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<h2>Hello World!</h2>
    <button type="button" class="btn btn-primary">（首选项）Primary</button>
</body>
</html>

将index.jsp在Tomcat中运行
根据Tomcat设置端口访问http://localhost:[端口号]/index.jsp
会出现带有Bootstrap样式的按钮

4. SSM整合配置文件

配置文件是到目前为止，后续使用功能再添加
虽然后面SpringBoot、SpringCloud配置文件变少了，但配置文件有助于理解框架的结构和功能
使用不同Spring版本，部分配置文件可能不同，下面是Spring 5

web.xml

tex

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
    <!--  标签按顺序编写  -->
    <display-name>Archetype Created Web Application</display-name>
    <!-- 1.启动spring的容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <!-- 2.字符编码过滤器 ,放在最前面执行-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!-- 配置编码格式 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!-- 设置响应和请求格式都为true -->
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>


    <!-- 3.使用REST风格URI,将普通的POST请求转为DELETE,GET -->
    <filter>
        <filter-name>hiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <!-- 添加能直接处理PUT请求的过滤器 -->
    <!-- HttpPutFormContentFilter过时了，使用 FormContentFilter能支持PUT和DELETE-->
    <filter>
        <filter-name>formContentFilter</filter-name>
        <filter-class>org.springframework.web.filter.FormContentFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>formContentFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>hiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 4.监听器,项目启动指定加载某spring配置文件,用于初始化 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 5.SpringMVC前端控制器, 拦截所有请求-->
    <!-- The front controller of this Spring Web application, responsible for handling all application requests -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!-- 指定springmvc配置文件 -->
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!-- Map all requests to the DispatcherServlet for handling -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

applicationContext.xml

jsp

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       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/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!-- spring配置文件,主要配置业务逻辑有关 -->
    <!-- 数据源,事务控制,mybatis整合 -->

    <!-- 自动扫描组件,但是不扫描Controller,Controller让springmvc扫描 -->
    <context:component-scan base-package="com.ssm">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>


    <!-- 引入外部配置文件 -->
    <context:property-placeholder location="classpath:dbconfig.properties"/>
    <!-- 数据源 C3P0 -->
    <!--    <bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">-->
    <!--        <property name="driverClass" value="${jdbc.driver}"/>-->
    <!--        <property name="jdbcUrl" value="${jdbc.url}"/>-->
    <!--        <property name="user" value="${jdbc.user}"/>-->
    <!--        <property name="password" value="${jdbc.password}"/>-->
    <!--    </bean>-->
    <!--  druid数据源  -->
    <bean id="pooledDataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.jdbcUrl}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!-- 配置mybatis整合 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定mybatis全局配置文件 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 数据源 -->
        <property name="dataSource" ref="pooledDataSource"/>
        <!-- 指定mybatis,mapper文件位置 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>

    <!-- 配置扫描器,将mybatis接口的实现加入到IOC容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 扫描所有dao接口实现,加入IOC容器中 -->
        <property name="basePackage" value="com.ssm.dao"></property>
    </bean>

    <!-- 配置一个可以执行批量sqlSession -->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
        <!-- 使用批量执行器 -->
        <constructor-arg name="executorType" value="BATCH"/>
    </bean>

    <!-- 事务控制的配置 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="pooledDataSource"></property>
    </bean>

    <!-- 开启基于注解/xml的事务,重要的用xml配合 -->
    <aop:config>
        <!-- 切入点表达式 被匹配中的都是切入点 之后被事务增强-->
        <aop:pointcut expression="execution(* com.ssm.service..*(..))" id="txPoint"/>
        <!-- 配置事务增强 -->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
    </aop:config>

    <!-- 利用事务管理器transactionManager,将上下两个配置链接一起,利用切入点表达式进行切入,之后的方法看下面 -->
    <!-- 配置事务增强 事务如何切入--><!-- 切入点表达式之后怎么切,要看下面的方法 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- * 代表所有方法都是事务方法 -->
            <tx:method name="*"/>
            <!-- 以get开头的方法 read-only只读-->
            <tx:method name="get*" read-only="true"/>
        </tx:attributes>
    </tx:advice>
</beans>

dbconfig.properties

properties

#c3p0数据源配置，使用jdbc前缀防止冲突
#jdbc.driver=com.mysql.cj.jdbc.Driver
#jdbc.url=jdbc:mysql://localhost:3306/ssm_crud?serverTimezone=UTC&useSSL=false
#jdbc.user=root
#jdbc.password=123456

#druid数据源配置，mysql 5和mysql 8配置信息不同
jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/ssm_crud?serverTimezone=UTC&useSSL=false
jdbc.username=root
jdbc.password=123456

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>
    <settings>
        <!-- 驼峰命名规则 从经典数据库列名 A_COLUMN 到经典 Java 属性名 aColumn 的类似映射。 -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

    <typeAliases>
        <package name="com.ssm.bean"/>
    </typeAliases>
</configuration>

springmvc.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"
       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">

    <!-- SpringMVC配置文件:包含网站跳转 -->
    <!-- 自动扫描组件,视图解析器,两个mvc标准配置 -->

    <!-- 自动扫描组件 ***-->
    <context:component-scan base-package="com.ssm" use-default-filters="false">
        <!-- use-default-filters="false" 禁用默认扫描包 -->
        <!-- 所以一般做法是，在SpringMVC的配置里，只扫描Controller层，
                Spring配置 中扫描所有包，但是排除Controller层。 -->
        <!-- include-filter 只扫描指定注解类 -->
        <context:include-filter type="annotation"
                                expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 两个标准配置 -->
    <!-- 将springmvc不能处理的请求交给Tomcat  静态页面，如html,css,js,images可以访问-->
    <mvc:default-servlet-handler/>
    <!-- 支持springmvc更高级功能,如JSR03校验,快捷ajax请求...映射动态请求
    注解驱动，以使得访问路径与方法的匹配可以通过注解配置-->
    <mvc:annotation-driven/>
</beans>

5. 创建数据库

一个库ssm_crud，两个表tbl_dept、tbl_emp

sql

-- ----------------------------
-- Table structure for tbl_dept
-- ----------------------------
DROP TABLE IF EXISTS `tbl_dept`;
CREATE TABLE `tbl_dept`  (
  `dept_id` int(11) NOT NULL AUTO_INCREMENT,
  `dept_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  PRIMARY KEY (`dept_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Table structure for tbl_emp
-- ----------------------------
DROP TABLE IF EXISTS `tbl_emp`;
CREATE TABLE `tbl_emp`  (
  `emp_id` int(11) NOT NULL AUTO_INCREMENT,
  `emp_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `gender` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `email` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `d_id` int(11) NULL DEFAULT NULL,
  PRIMARY KEY (`emp_id`) USING BTREE,
  INDEX `fk_emp_dept`(`d_id`) USING BTREE,
  CONSTRAINT `fk_emp_dept` FOREIGN KEY (`d_id`) REFERENCES `tbl_dept` (`dept_id`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB AUTO_INCREMENT = 1036 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

6. MyBatis Generator逆向工程

根据现有的数据库结构生成对象的JavaBean、Dao接口、Mapper.xml等

在ssm_crud根目录下创建mbg.xml配置文件

tex

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>

    <context id="DB2Tables" targetRuntime="MyBatis3">

        <!-- 生成toString方法-->
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin"/>

        <!-- 禁止自动生成注释 -->
        <commentGenerator>
            <!-- 编码格式 -->
            <property name="javaFileEncoding" value="UTF-8"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!-- 配置数据库连接 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/ssm_crud?serverTimezone=UTC&useSSL=false"
                        userId="root" password="123456"/>

        <!--数据库BigDecimals字段在java中定义 -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 指定JavaBean生成位置 -->
        <javaModelGenerator targetPackage="com.ssm.bean"
                            targetProject="src\main\java"/>

        <!-- 指定sql映射文件生产位置 -->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="src\main\resources"/>

        <!-- 指定dao接口生成的位置,mapper接口 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.ssm.dao" targetProject="src\main\java"/>

        <!-- 指定每个表生成策略 -->
        <table tableName="tbl_emp" domainObjectName="Employee"></table>
        <table tableName="tbl_dept" domainObjectName="Department"></table>

    </context>
</generatorConfiguration>

在com.ssm.test包中任意创建一个测试方法，然后运行

java

/**
 * MyBatis Generator逆向工程
 */
public class MBGTest {
    public static void main(String[] args) throws InvalidConfigurationException, IOException, XMLParserException, SQLException, InterruptedException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("mbg.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }

}

之后项目自动生成文件，主要分三部分
- 每个表生成对应JavaBean和对应的查询条件Example
- Dao接口
- Mapper.xml文件

自动生成的功能不能满足指定的查询条件，所以需要修改
实现一条sql完成联表查询，在逆向工程的基础上，需要修改以下地方

JavaBean

Department

java

package com.ssm.bean;

public class Department {
    private Integer deptId;

    private String deptName;

    //如果用了构造器,一定要写无参构造器
    public Department() {
        super();
    }
    public Department(Integer deptId, String deptName) {
        super();
        this.deptId = deptId;
        this.deptName = deptName;
    }

    //get/set/toString
}

Employee

java

package com.ssm.bean;

public class Employee {
    private Integer empId;

    private String empName;

    private String gender;

    private String email;

    private Integer dId;

    // 增加联合查询
    private Department department;
    // 如果用了构造器,一定要写无参构造器
    public Employee() {
        super();
    }
    // 不加Department的属性
    public Employee(Integer empId, String empName, String gender, String email, Integer dId) {
        super();
        this.empId = empId;
        this.empName = empName;
        this.gender = gender;
        this.email = email;
        this.dId = dId;
    }

    // get/set/toString
}

EmployeeMapper

java

public interface EmployeeMapper {
	//...
	
	//新增两个查询方法,用于联合查询
    List<Employee> selectByExampleWithDept(EmployeeExample example);
    Employee selectByPrimaryKeyWithDept(Integer empId);
}

Mapper

EmployeeMapper.xml

tex

<mapper namespace="com.ssm.dao.EmployeeMapper">
	<!-- ... -->
	
    <!-- 新增两个查询方法,在查empt员工时,同时查出部门联合查询 -->
    <!-- 条件查询  List<Employee> selectByExampleWithDept(EmployeeExample example); -->
    <!-- 查询主键  Employee selectByPrimaryKeyWithDept(Integer empId); -->

    <!-- 新增  查询empty和dept的列 -->
    <sql id="WithDept_Column_List">
  	e.emp_id, e.emp_name, e.gender, e.email, e.d_id, d.dept_id, d.dept_name
    </sql>
    <!-- 新增 处理自定义的返回映射 部门信息封装-->
    <resultMap type="com.ssm.bean.Employee" id="WithDeptResultMap">
        <id column="emp_id" jdbcType="INTEGER" property="empId" />
        <result column="emp_name" jdbcType="VARCHAR" property="empName" />
        <result column="gender" jdbcType="CHAR" property="gender" />
        <result column="email" jdbcType="VARCHAR" property="email" />
        <result column="d_id" jdbcType="INTEGER" property="dId" />
        <!-- 联合查询 部门信息封装 -->
        <association property="department" javaType="com.ssm.bean.Department">
            <id column="dept_id" property="deptId"/>
            <result column="dept_name" property="deptName"/>
        </association>
    </resultMap>

    <!-- 自定义 根据条件查询 联表 员工+部门 按照逆向模板修改-->
    <select id="selectByExampleWithDept" resultMap="WithDeptResultMap">
        select
        <if test="distinct">
            distinct
        </if>
        <!-- 查询条件,只用自定义的,包含两个表的字段 -->
        <include refid="WithDept_Column_List"/>
        from tbl_emp e
        left join tbl_dept d
        on e.d_id = d.dept_id
        <!-- 后面语句用来处理条件 -->
        <if test="_parameter != null">
            <include refid="Example_Where_Clause"/>
        </if>
        <!-- 原装，应该是复杂查询中的排序条件
        <if test="orderByClause != null">
          order by ${orderByClause}
        </if> -->
        order by e.emp_id
    </select>
    <!-- 自定义 根据主键查询 联表 员工+部门 -->
    <select id="selectByPrimaryKeyWithDept" resultMap="WithDeptResultMap">
        select
        <include refid="WithDept_Column_List"/>
        from tbl_emp e
        left join tbl_dept d
        on e.d_id = d.dept_id
        where emp_id = #{empId,jdbcType=INTEGER}
    </select>
    
	<!-- ... -->
</mapper>

在com.ssm.test中任意创建测试类，测试sql连接并添加数据

java

//如果您想在测试中使用Spring测试框架功能（例如）@MockBean，则必须使用@ExtendWith(SpringExtension.class)。它取代了不推荐使用的JUnit4@RunWith(SpringJUnit4ClassRunner.class)
@ExtendWith(SpringExtension.class)
@ContextConfiguration(locations = {"classpath:applicationContext.xml"})
public class MapperTest {

	@Autowired
	DepartmentMapper departmentMapper;
	@Autowired
	EmployeeMapper employeeMapper;
	//批量sqlSession
	@Autowired
	SqlSessionTemplate sqlSessionTemplate;

    @Test
    public void test(){
        //Employee employee = employeeMapper.selectByPrimaryKeyWithDept(1);
        //System.out.println(employee);
        
        //1.插入部门
//		departmentMapper.insertSelective(new Department(null, "开发部"));
//		departmentMapper.insertSelective(new Department(null, "测试部"));
		
		//2.插入员工
//		employeeMapper.insertSelective(new Employee(null, "Tom", "M", "[email protected]", 1));
		
		//3.批量插入
		//使用sqlSessionTemplat可以实现批量,不使用就不是
		EmployeeMapper eMapperTemplat = sqlSessionTemplate.getMapper(EmployeeMapper.class);
		for(int i = 0 ; i <= 1000 ; i++) {
			
			String uuid = UUID.randomUUID().toString().substring(0, 5) + i;
			//这里继续使用employeeMapper就不行
			//employeeMapper.insertSelective(new Employee(null, uuid, "M", uuid+"@123.com", 1));
			
			//使用employeeMapperTemplat批量插入
			eMapperTemplat.insertSelective(new Employee(null, uuid, "M", uuid+"@123.com", 1));
		}
	}
    
}

到目前为止，Spring、SpringMVC、MyBatis都已经配置完成，各功能可以连通，可以进行编写增删改查的代码了。目前目录结构如下

properties

ssm_crud
    src
        main
        	java
        		com.ssm.bean
        			Department.java
        			EmployeeExample.java
        			Employee.java
        			DepartmentExample.java
        		com.ssm.dao
        			EmployeeMapper.java
        			DepartmentMapper.java
        		com.ssm.service
        		com.ssm.controller
        		com.ssm.test
        			MapperTest.java
        			MBGTest.java
        		com.ssm.utils
        	resources
        		mapper
        			DepartmentMapper.xml
        			EmployeeMapper.xml
        		applicationContext.xml
        		dbconfig.properties
        		mybatis-config.xml
        		springmvc.xml
            webapp
            	static
            		bootstrap-3.3.7-dist
        			jquery-1.12.4.js
                WEB-INF
                	views
                	web.xml
                index.jsp
	pom.xml
	mbg.xml

__EOF__

SSM整合_年轻人的第一个增删改查_基础环境搭建 - 蔚然丶丶

1、基础环境搭建

1. 创建Maven工程

2. 引入依赖jar

3. 引入Bootstrap前端框架

4. SSM整合配置文件

web.xml

applicationContext.xml

dbconfig.properties

mybatis-config.xml

springmvc.xml

5. 创建数据库

6. MyBatis Generator逆向工程

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