一、前言
之前学习ssm框架的时候都是每个框架独立分散的系统性学习，对于框架的整体，总结效果不太好，后来看了黑马视频教程有个老师的思路给了我比较大的启发，以spring为中心，去整合springmvc、mybatis，无论是搭建环境，还是理解整体ssm思路都是比较不错的选择
二、SSM整合步骤介绍（本文通过注解+配置实现）
首先进行整合的前提是确保各自独立都能够正常运行，然后在互相整合横向扩展
1、在domain包下定义一个Account的Javabean类用于交互数据
public class Account implements Serializable {
private Integer id;
private String name;
private Integer salary;
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 Integer getSalary() {
return salary;
}
public void setSalary(Integer salary) {
this.salary = salary;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", salary=" + salary +
'}';
}
}
2、先在业务层定义IAccountService接口及AccountServiceImpl接口实现类
@Service
public interface IAccountService {
//查询用户
List<Account> findAccount();
//删除用户
void delAccount(Account account);
//添加用户
void addAccount(Account account);
}
@Service("accountService")
public class AccountServiceImpl implements IAccountService {
@Autowired
private AccountDao accountDao;
@Override
public List<Account> findAccount(){
System.out.println("业务层findAccount方法执行了");
return accountDao.findAccount();
}
@Override
public void delAccount(Account account) {
System.out.println("业务层delAccount方法执行了");
accountDao.delAccount(account);
}
@Override
public void addAccount(Account account) {
System.out.println("业务层addAccount方法执行了");
accountDao.addAccount(account);
}
}
3、在dao层定义AccountDao用于跟数据库进行交互，得到结果
@Repository
public interface AccountDao {
//查询用户
@Select("select * from user_info")
List<Account> findAccount();
//删除用户
@Delete("delete from user_info where id=#{id}")
void delAccount(Account account);
//添加用户
@Insert("insert into user_info values(#{id},#{name},#{salary})")
void addAccount(Account account);
}
4、业务层/持久层整合的配置文件
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--配置业务层要扫描的包-->
<context:component-scan base-package="com.yushi">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--配置连接池-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
<property name="jdbcUrl" value="jdbc:mysql://ip:port/test"/>
<property name="user" value="****"/>
<property name="password" value="*****"/>
</bean>
<!--配置sqlsessionFactory工厂-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--配置dao要扫描的包-->
<bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.yushi.dao"/>
</bean>
<!--配置Spring框架声明式事务管理-->
<!--配置事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="find*" read-only="true"/>
<tx:method name="*" isolation="DEFAULT"/>
</tx:attributes>
</tx:advice>
<!--配置AOP增强-->
<aop:config>
<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.yushi.service.impl.*.*(..))"/>
</aop:config>
</beans>
5、调试下整合后的效果，成功获得持久层的数据（业务层、持久层建立联系没有问题）
public class client {
@Test
public void run2(){
ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");
IAccountService accountService = (IAccountService)ioc.getBean("accountService");
List<Account> accounts = accountService.findAccount();
for (Account account:accounts){
System.out.println(account);
}
}
}
6、开始建立表现层与业务层之间的联系，配置webapp包下的index.jsp，确保前端入口可以正确访问到服务端表现层
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>测试</title>
</head>
<body>
<a href="/user/findAll">查询用户信息</a><br/>
<form action="/user/delAccount" method="post">
用户id：<input type="text" name="id"><br/>
<input type="submit" value="提交"><br/>
</form>
<form action="/user/addAccount" method="post">
用户id <input type="text" name="id"><br/>
用户名：<input type="text" name="name"><br/>
工资： <input type="text" name="salary"><br/>
<input type="submit" value="提交">
</form>
</body>
</html>
7、配置前端控制器，表现层的枢纽部分，对应web.xml文件
<!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>
<display-name>Archetype Created Web Application</display-name>
<!--配置spring的监听器-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--设置配置文件的路径-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!--配置前端控制器-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--加载springmvc配置文件-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!--启动服务器，创建servlet-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--解决中文乱码问题-->
<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>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
8、配置表现层对应spring容器的初始化文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
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
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--开启注解扫描，只扫描controller注解-->
<context:component-scan base-package="com.yushi">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--配置视图解析器-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--开启springmvc注解的支持-->
<mvc:annotation-driven/>
</beans>
9、在controller包下定义AccountController类，定义方法用于跟业务层进行联系
@Controller
@RequestMapping("/user")
public class AccountController {
@Autowired
private IAccountService accountService;
//查询所有账户
@RequestMapping("/findAll")
public String findAll(Model model){
System.out.println("表现层findAll方法执行了");
List<Account> accounts = accountService.findAccount();
for (Account account:accounts){
System.out.println(account);
}
model.addAttribute("list",accounts);
return "success";
}
//删除账户
@RequestMapping("/delAccount")
public String delAccount(){
Account account = new Account();
account.setId(1);
System.out.println("表现层delAccount方法执行了");
accountService.delAccount(account);
return "success";
}
//添加账户
@RequestMapping("/addAccount")
public String addAccount(Integer id,String name,Integer salary){
Account account = new Account();
account.setId(id);
account.setName(name);
account.setSalary(salary);
System.out.println("表现层addAccount方法执行了");
accountService.addAccount(account);
return "success";
}
}
10、在WEB-INF/pages目录下新建success.jsp用于controller方法请求成功后跳转的页面
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>成功</title>
</head>
<body>
<h3>跳转成功</h3>
<c:forEach items="${list}" var="account">
${account.name}<br/>
</c:forEach>
</body>
</html>
11、项目整体引入的依赖包参考
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<spring.version>5.0.2.RELEASE</spring.version>
<slf4j.version>1.6.6</slf4j.version>
<log4j.version>1.2.12</log4j.version>
<mysql.version>5.1.6</mysql.version>
<mybatis.version>3.4.5</mybatis.version>
</properties>
<dependencies>
<!-- spring -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.8</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- log end -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
</dependencies>
三、结合项目层级介绍用户请求代码走向
1、通过Tomcat启动后端服务时，Tomcat会加载web.xml配置，创建servletContext域对象，同时还会初始化两个bean工厂，一个是springmvc.xml，一个是applicationContext.xml
1、applicationContext是通过监听器，监听servletContext对象是否创建而进行创建的
2、关于spring对应的bean工厂初始化的对象有哪些大家可配置文件即可
2、用户最初通过http://localhost:8080/index.jsp访问到index.jsp资源文件，触发事件
3、通过index.jsp中的事件触发请求到DispatcherServlet前端控制器，通过前端控制器分发到映射器,也就是我们配置的@requestMapping注解，映射到目标方法执行
4、执行controller层方法，会注入service层对象执行service下对应的接口方法（这个时候程序处理逻辑已经来到了业务层）
5、在service接口实现方法中又注入了dao层对象，然后通过方法去调用通知dao层（这个时候程序已经走到持久层）
6、DAO层对数据进行响应的增删改查，将结果返回到service层，service层又将结果向上返回到controller
7、最后controller层将最终结果通知到success.jsp文件
8、用户看到最后的变动效果
四、SSM简单整合demo源码