SSM 编程，即 SpringMVC + Spring + MyBatis 整合，是当前最为流行的 JavaEE 开发技术架构。其实SSM整合的实质，仅仅就是将MyBatis整合入Spring。因为 SpringMVC 原本就是Spring 的一部分，不用专门整合。
SSM 整合的实现方式可分为两种：基于 XML 配置方式，基于注解方式。

1.1 搭建SSM开发环境

1.1.1 Maven依赖

pom.xml

  <dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!--servlet依赖--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!-- jsp依赖 --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2.1-b03</version><scope>provided</scope></dependency><!-- web依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.5.RELEASE</version></dependency><!-- 事务依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>5.2.5.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.5.RELEASE</version></dependency><!-- json依赖 --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency><!-- spring-mybatis整合依赖 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.1</version></dependency><!-- mybatis依赖 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.1</version></dependency><!-- 数据库连接依赖 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.27</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.12</version></dependency></dependencies><build><resources><resource><directory>src/main/java</directory><!--所在的目录--><includes><!--包括目录下的.properties,.xml 文件都会扫描到--><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource><resource><directory>src/main/java</directory><!--所在的目录--><includes><!--包括目录下的.properties,.xml 文件都会扫描到--><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource></resources><plugins><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.1</version><configuration><source>1.8</source><target>1.8</target></configuration></plugin></plugins></build>

1.1.2 配置web.xml

1）注册 ContextLoaderListener 监听器

<!--注册spring的监听器--><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:conf/appliactionContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

注册 ServletContext 监听器的实现类 ContextLoaderListener，用于创建 Spring 容器及将创建好的 Spring 容器对象放入到 ServletContext 的作用域中。

2）注册字符集过滤器

<!--注册字符集过滤器--><filter><filter-name>characterEncodingFilter</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><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><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>

注册字符集过滤器，用于解决请求参数中携带中文时产生乱码问题。

3）配置中央调度器

配置中央调度器时需要注意，SpringMVC的配置文件名与其它Spring配置文件名不相同。这样做的目的是 Spring 容器创建管理 Spring 配置文件中的 bean， SpringMVC 容器中负责视图层 bean 的初始化。

<!--注册中央调度器--><servlet><servlet-name>myweb</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:conf/dispatcherServlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>myweb</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping>

1.2 SSM 整合注解开发

1.2.1 建立数据库表

1.2.2 编写配置文件

1）jdbc.properties

2）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"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"><!--spring配置文件： 声明service，dao，工具类等对象--><context:property-placeholder location="classpath:conf/jdbc.properties" /><!--声明数据源，连接数据库--><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"init-method="init" destroy-method="close"><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.username}" /><property name="password" value="${jdbc.password}" /></bean><!--SqlSessionFactoryBean创建SqlSessionFactory--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="configLocation" value="classpath:conf/mybatis.xml" /></bean><!--声明mybatis的扫描器，创建dao对象--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /><property name="basePackage" value="com.suyv.dao" /></bean><!--声明service的注解@Service所在的包名位置--><context:component-scan base-package="com.suyv.service" />
</beans>

3）dispatcherServlet.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， 声明controller和其它web相关的对象--><context:component-scan base-package="com.suyv.controller" /><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="WEB-INF/jsp/" /><property name="suffix" value=".jsp" /></bean><mvc:annotation-driven />
</beans>

4）mybatis.xml：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><!--设置别名--><typeAliases><!--name:实体类所在的包名(不是实体类的包名也可以)--><package name="com.suyv.domain"/></typeAliases><!--sql mapper(sql映射文件)的位置--><mappers><package name="com.suyv.dao"/></mappers>
</configuration>

1.2.3 实体类Student

package com.suyv.domain;public class Student {private Integer id;private String name;private String email;private Integer age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}}

1.2.4 Dao接口和sql映射文件

1）studentDao.java

package com.suyv.dao;
import com.suyv.domain.Student;
import java.util.List;public interface StudentDao {int insertStudent(Student student);List<Student> selectStudent();
}

2）StudentDao.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.suyv.dao.StudentDao"><insert id="insertStudent" >insert into student(name,email,age) values (#{name},#{email},#{age})</insert><select id="selectStudent" resultType="Student">select id,name,email,age from student order by id</select></mapper>

1.2.5 Service接口和实现类

1）StudentService

package com.suyv.service; 
import com.suyv.domain.Student;             
import java.util.List;public interface StudentService {int addStudent(Student student);List<Student> findStudent();
}

2）StudentServiceImpl

package com.suyv.service.impl;import com.suyv.dao.StudentDao;
import com.suyv.domain.Student;
import com.suyv.service.StudentService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.List;@Service
public class StudentServiceImpl implements StudentService {@Resourceprivate StudentDao studentDao;@Overridepublic int addStudent(Student student) {int nums = studentDao.insertStudent(student);return nums;}@Overridepublic List<Student> findStudent() {return studentDao.selectStudent();}
}

1.2.6 处理器定义

1）StudentConreoller.java

package com.suyv.controller;import com.suyv.domain.Student;
import com.suyv.service.StudentService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;@Controller
public class StudentController {@Resourceprivate StudentService studentService;@RequestMapping(value = "/addstudent.do")public ModelAndView addStudent(Student student){ModelAndView mv = new ModelAndView();String tips = "注册失败";//调用service处理studentint nums = studentService.addStudent(student);if(nums > 0){//注册成功tips = "学生【" + student.getName() + "】注册成功";}mv.addObject("tips",tips);mv.setViewName("result");return mv;}@RequestMapping(value = "/queryStudent.do")@ResponseBodypublic List<Student> queryStudent(){//参数检查， 简单的数据处理List<Student> students = studentService.findStudent();return students;}
}

1.2.7 定义视图-首页文件 — index.jsp

1.2.8 注册学生页面 — addStudent.jsp

<html>
<head><title>注册学生</title><base href="<%=basePath%>" />
</head>
<body>
<div align="center"><form action="addstudent.do" method="post"><table><tr><td>id：</td><td><input type="text" name="id"></td></tr><tr><td>姓名：</td><td><input type="text" name="name"></td></tr><tr><td>邮箱：</td><td><input type="text" name="email"></td></tr><tr><td>年龄：</td><td><input type="text" name="age"></td></tr><tr><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td><input type="submit" value="注册"></td></tr></table></form>
</div>
</body>
</html>

1.2.9 浏览学生页面 — listStudent.jsp

<html>
<head><title>查询学生ajax</title><base href="<%=basePath%>" /><script type="text/javascript" src="js/jquery-3.4.1.js"></script><script type="text/javascript">$(function(){//在当前页面dom对象加载后，执行loadStudentData（）loadStudentData();$("#btnLoader").click(function(){loadStudentData();})})function loadStudentData(){$.ajax({url:"queryStudent.do",type:"get",dataType:"json",success:function(data){//清除旧的数据$("#info").html("");//增加新的数据$.each(data,function(i,n){$("#info").append("<tr>").append("<td>"+n.id+"</td>").append("<td>"+n.name+"</td>").append("<td>"+n.email+"</td>").append("<td>"+n.age+"</td>").append("</tr>")})}})}</script>
</head>
<body>
<div align="center"><table><thead><tr><td>学号</td><td>姓名</td><td>邮箱</td><td>年龄</td></tr></thead><tbody id="info"></tbody></table><input type="button" id="btnLoader" value="查询数据">
</div>
</body>
</html>

1.2.10 注册结果页面 — result.jsp

1.2.11 运行结果

1）index.jsp页面：

2）注册学生页面：

3）注册成功页面：

4）浏览学生页面：