SSM详细整合（有登录注册的例子）
1.项目整体结构
2.环境搭建
- pom.xml (依赖)
① Spring框架所需jar包
② Spring MVC所需jar包
③ Mybatis框架所需jar包
④ Mybatis与Spring整个的中间jar包
⑤ 数据库驱动jar包
⑥ 数据源所需jar包
<?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>org.example</groupId> <artifactId>Test4</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>Test4 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>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> </properties> <dependencies> <!--Spring--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.18</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.3.18</version> </dependency> <!--mysql-connector--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.19</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <!-- mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.7</version> </dependency> <!--servlet api--> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>javax.servlet.jsp-api</artifactId> <version>2.2.1</version> </dependency> <!-- jstl --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- log --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.25</version> </dependency> <!--数据库连接池--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-dbcp2</artifactId> <version>2.1.1</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>2.4.2</version> </dependency> <!-- Junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13.2</version> </dependency> </dependencies> <build> <finalName>Test4</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> <resources> <resource> <!-- 设定主资源目录 --> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build> </project>
- web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <!-- Spring相关--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!-- 监听器--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--前端控制器--> <servlet> <servlet-name>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-config.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> <!-- 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> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
- 数据库常量配置文件db.properties
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/db?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8 jdbc.username=root jdbc.password=1234 jdbc.maxTotal=30 jdbc.maxIdle=10 jdbc.initialSize=5
- Spring配置文件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" 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-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd"> <!-- 读取db.properties --> <context:property-placeholder location="classpath:db.properties" /> <!-- 配置数据源 --> <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"> <property name="driverClassName" value="${jdbc.driver}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="maxTotal" value="${jdbc.maxTotal}" /> <property name="maxIdle" value="${jdbc.maxIdle}" /> <property name="initialSize" value="${jdbc.initialSize}" /> </bean> <!-- 事务管理器，依赖于数据源 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 开启事务注解 --> <tx:annotation-driven transaction-manager="transactionManager" /> <!-- 配置MyBatis工厂SqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--注入数据源 --> <property name="dataSource" ref="dataSource" /> <!--指定核MyBatis心配置文件位置 --> <property name="configLocation" value="classpath:mybatis-config.xml" /> </bean> <!-- 配置mapper扫描器 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.hpf.Mapper" /> </bean> <!-- 扫描Service --> <context:component-scan base-package="com.hpf.service" /> </bean> </beans>
在applicationContext.xml中，首先定义了读取 properties 文件的配置，然后配置了数据源，接下来配置了事务管理器并开启了事务注解，最后配置了 MyBatis 工厂来与 Spring 整合。其中， MyBatis 工厂的作用就是构建 SqISessionFactory ，它通过 mybatis - spring 包中提供的 orgmybatis spring . SqISessionFactoryBean 类来配置。通常，在配置时需要提供两个参数：一个是数据源，另一个是 MyBatis 的配置文件路径。这样 Spring 的 loC 容器就会在初始化 id 为sqISessionFactory 的 Bean 时解析 MyBatis 的配置文件，并与数据源一同保存到 Spring 的 Bean 中。
5. Mybatis的配置文件mybatis-config.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> <!-- 别名定义 --> <typeAliases> <package name="com.hpf.po" /> </typeAliases> </configuration>
- 视图解析器配置文件springmvc-config.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"> <!-- 配置包扫描器，扫描@Controller注解的类 --> <context:component-scan base-package="com.hpf.controller" /> <!-- 加载注解驱动 --> <mvc:annotation-driven /> <!-- 配置视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> </beans>
- 日志配置文件
# Global logging configuration log4j.rootLogger=ERROR, stdout # MyBatis logging configuration... log4j.logger.com.itheima=DEBUG # Console output... log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
3.SSM框架整合
用户注册和登录为例
- 在src目录下，创建com.hpf.po包，并在包中创建持久化类User.
package com.hpf.po; public class User { private Integer id; private String name; private String password; private String phone; private String jobs; private String email; 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 getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getJobs() { return jobs; } public void setJobs(String jobs) { this.jobs = jobs; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User [id=" + id + ", name=" + name + ", password=" + password + ", phone=" + phone + ", jobs=" + jobs + ", email=" + email + "]"; } }
- 在src目录下，创建com.hpf.Mapper包，并在包中创建接口文件UserMapper以及对应的映射文件UserMapper.xml。
UserMapper.java：
package com.hpf.Mapper; import com.hpf.po.User; public interface UserMapper { //用户登录 int findOne(User user); //用户注册 void addOne(User user); //注册时的重名检测 User checkReg(String username); }
UserMapper.xml：
<?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.hpf.Mapper.UserMapper"> <select id="findOne" resultType="Integer"> select count(*) from user where name=#{name} and password=#{password} </select> <update id="addOne"> insert into user(name,password,phone,jobs,email) values(#{name},#{password},#{phone},#{jobs},#{email}) </update> <select id="checkReg" resultType="com.hpf.po.User"> select * from user where name=#{name} </select> <select id="findUserById" parameterType="Integer" resultType="User"> select * from User where id=#{id} </select> </mapper>
- 在src目录下，创建com.hpf.service包，并在包中创建接口文件UserService以及接口实现类UserServiceImpl。
UserService.java：
package com.hpf.service; import com.hpf.po.User; public interface UserService { int findOne(User user); void addOne(User user); User checkReg(String username); }
UserServiceImpl.java：
package com.hpf.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.hpf.Mapper.UserMapper; import com.hpf.po.User; import org.springframework.transaction.annotation.Transactional; @Service @Transactional public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; public int findOne(User user) { return userMapper.findOne(user); } public void addOne(User user) { userMapper.addOne(user); // int i=1/0; //测试事务 } public User checkReg(String username) { return userMapper.checkReg(username); } }
使用了@Service注解来标识业务层的实现类，使用了@Transactional注解来标识类中的所有方法都纳入Spring的事务管理，并使用@Autowired注解将UserMapper接口对象注入到本类中，然后调用相应方法方法。
4. 在src目录下，创建com.hpf.controller包，并在包中创建用于处理页面请求的控制类UserContrller。
package com.hpf.controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import com.hpf.po.User; import com.hpf.service.UserService; @Controller @RequestMapping("/user") public class UserContrller { @Autowired private UserService userService; @RequestMapping("/golog") public String log() { return "log"; } @RequestMapping("/login") public String log(User user, Model model) { int u = userService.findOne(user); if (u != 0) { model.addAttribute("msg","欢迎您，登录成功！"); } else model.addAttribute("msg","登录失败，用户名或密码错误！"); return "message"; } @RequestMapping("/goreg") public String reg() { return "reg"; } @RequestMapping("/register") public String register(User user, HttpServletRequest request , HttpServletResponse response, Model model){ if(userService.checkReg(user.getName())!=null){ model.addAttribute("msg","注册失败，用户名已存在！"); }else{ userService.addOne(user); model.addAttribute("msg","欢迎您，注册成功！"); } return "message"; } }
- 在WEB-INF目录下，创建一个jsp文件夹，在该目录下创建登录页面log.jsp、注册页面reg.jsp以及信息显示的页面文件message.jsp。
log.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>用户登录</title> <style type="text/css"> div { width: 300px; height: 200px; margin-left: auto; margin-right: auto; } </style> </head> <body> <div> <form action=${pageContext.request.contextPath}/user/login method="post"> <table border="1"> <tr> <td>用户名:</td> <td><input type="text" name="name"></td></td> </tr> <tr> <td>密 码:</td> <td><input type="password" name="password"></td> </tr> <tr> <td colspan="2" style="text-align: center;"> <input type="submit" value="登录"></td> </tr> <tr> <td colspan="2" style="text-align: center;"><a href="http://localhost:8080/user/goreg">还没有账号？点此注册</a></td> </tr> </table> </form> </div> </body> </html>
reg.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>用户注册</title> <style type="text/css"> div { width: 300px; height: 200px; margin-left: auto; margin-right: auto; } </style> </head> <body> <div> <form action=${pageContext.request.contextPath}/user/register method="post"> <table border="1"> <tr> <td>用户名:</td> <td><input type="text" name="name" ></td> </tr> <tr> <td>密 码:</td> <td><input type="password" name="password" ></td> </tr> <tr> <td>电 话:</td> <td><input type="text" name="phone" ></td> </tr> <tr> <td>工 作:</td> <td><input type="text" name="jobs" ></td> </tr> <tr> <td>邮 箱:</td> <td><input type="text" name="email" ></td> </tr> <tr> <td colspan="2" style="text-align: center;"><input type="submit" value="注册"></td> </tr> </table> </form> </div> </body> </html>
message.jap:
<%-- Created by IntelliJ IDEA. User: LENOVO Date: 2022/5/21 Time: 11:04 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>信息提示</title> </head> <body> <h2><font color="#f00">${msg}</font></h2> </body> </html>
- 运行结果：
注册：
登录：
4.总结：
Spring+ Mybatis +SpringMVC的整合思路:
1.以Spring作为核心框架，数据持久化使用Mybatis完成，表现层使用SpringMVC
2.Spring提供对象管理、面向切面编程等实用功能
3.通过Spring提供的服务简化编码、降低开发难度、提高开发效率
MVC模式:
1.持久层—>mybatis：通过Spring 来管理持久层的 Mapper （相当于 dao 接口），来完成对数据库的操作。
2.业务层—>spring：通过Spring 来管理业务层的 service （通过调用 mapper 接口），通过spring的IOC和DI来实现完全的面向接口编程，降低类之间的耦合，并且使用spring AOP来控制事务处理。
3.表现层—>springMVC：通过Spring 来管理表现层的 Handler （通过调用 Service 接口），来实现流程跳转的控制。
