【JAVA】经典传统SSM项目搭建 完整项目示例代码

项目结构

在这里插入图片描述

pom.xml 配置

<?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.davarich</groupId>
    <artifactId>webssm</artifactId>
    <version>1.0.0</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <spring.version>6.0.0</spring.version>
    </properties>

    <dependencies>
        <!-- Spring Framework -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- MyBatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.10</version>
        </dependency>
        
        <!-- Mybatis整合Spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>3.0.1</version>
        </dependency>

        <!-- Database -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.30</version>
        </dependency>
        
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>5.0.1</version>
        </dependency>

        <!-- Servlet API -->
        <!-- Java 17.0.x版本和Tomcat 10.1.x及以上版本的运行环境下,javax.servlet依赖需要改换为jakarat.servlet(jakarat EE 9.0+)依赖,对应的Spring Framework版本也需要换到6.0.0及以上版本。 -->
        <dependency>
            <groupId>jakarta.servlet</groupId>
            <artifactId>jakarta.servlet-api</artifactId>
            <version>5.0.0</version>
            <scope>provided</scope>
        </dependency>

        <!-- JSP -->
        <dependency>
            <groupId>jakarta.servlet.jsp</groupId>
            <artifactId>jakarta.servlet.jsp-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>jakarta.servlet.jsp.jstl</artifactId>
            <version>2.0.0</version>
        </dependency>

        <!-- JSON -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.15.3</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>ssm-demo</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.11.0</version>
                <configuration>
                    <source>17</source>
                    <target>17</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

web.xml 配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">

    <!-- spring配置 -->
    <!-- 服务启动时读取web.xml文件,然后根据文件中配置的applicationContext.xml加载spring容器。 
	ContextLoaderListener的作用:就是启动Web容器时,读取在contextConfigLocation中定义的xml文件,自动装配ApplicationContext的配置信息,并产生	WebApplicationContext对象,然后将这个对象放置在ServletContext的属性里,这样我们只要得到Servlet就可以得到WebApplicationContext对象,并利用这	个对象访问spring容器管理的bean。-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Spring MVC配置 -->
    <!-- 客户端请求提交到 DispatcherServlet ,然后由 DispatcherServlet 控制器借助 springmvc 提供的 HandlerMapping 找到处理请求Controller,Controller处理完用户请求后将返回 ModelAndView(包含模型和视图)对象给 DispatcherServlet 前端控制器。 -->
    
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 字符编码过滤器 -->
    <filter>
        <filter-name>encodingFilter</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>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
</web-app>

db.properties 配置

db.driver=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/mydb?useSSL=false&serverTimezone=UTC
db.username=root
db.password=123456

mybatis-config.xml 配置

<?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>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <typeAliases>
        <package name="com.davarich.entity"/>
    </typeAliases>
</configuration>

UserMapper.xml 配置

<?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.davarich.mapper.UserMapper">
    <select id="selectUsers" resultType="User">
        SELECT * FROM user
    </select>
</mapper>

applicationContext.xml 配置

<?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://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/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 引入数据库配置文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 启用注解扫描 -->
    <context:component-scan base-package="com.davarich.service,mapper"/>

    <!-- 数据源配置,使用hikari连接池技术 -->
    <bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="jdbcUrl" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>

    <!-- MyBatis配置 -->
    <!-- 配置SqlSessionFactory工厂,由mybatis管理,mybatis配置mybatis-config.xml和UserMapper.xml结合数据源
	创建SqlSessionFactory工厂 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>
	
    <!-- 配置Mapper接口扫描 -->
    <!-- 采用MapperScannerConfigurer扫描类让mapper包的接口和sql联系起来,从而实现调用者通过接口自由使用相关数据库访问操作的功能。 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.davarich.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

    <!-- 事务管理 -->
    <!-- 数据源事务管理器 ioc,指定管理的数据源 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
	<!-- 开启事务注解驱动 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

springmvc.xml 配置

<?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
        https://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">

    <!-- 组件扫描 -->
    <context:component-scan base-package="com.davarich.controller"/>

    <!-- 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>

    <!-- 静态资源处理 -->
    <mvc:resources mapping="/static/**" location="classpath:/static/"/>

    <!-- 启用注解驱动 -->
    <mvc:annotation-driven/>
</beans>

实体类 entity (Users.java)

package com.davarich.entity;

public class User {
    private Integer id;
    private String name;
    private String email;

    public User() {
    }

    public User(Integer id, String name, String email) {
        this.id = id;
        this.name = name;
        this.email = 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 getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

持久层 mapper (UserMapper.java)

package com.davarich.mapper;

import com.davarich.entity.User;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;

@Mapper
public interface UserMapper {

    List<User> selectUsers();

}

业务层 service

接口类 UserService.java

package com.davarich.service;

import com.davarich.entity.User;
import java.util.List;

public interface UserService {

    List<User> getAllUsers();

}

实现类 UserServiceImpl.java

package com.davarich.service;

import com.davarich.entity.User;
import com.davarich.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> getAllUsers() {
        return userMapper.selectUsers();
    }
}

控制层 controller (UserController.java)

package com.davarich.controller;

import com.davarich.entity.User;
import com.davarich.service.UserService;
import com.oracle.wls.shaded.org.apache.bcel.generic.RETURN;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import java.util.List;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/users")
    public String listUsers(Model model) {
        List<User> users = userService.getAllUsers();
        model.addAttribute("users", users);
        return "user/list";
    }
    
    @GetMapping("/welcome")
    public String welCome(){
        return "user/welcome";
    }
    
}

前端页面(JSP)

welcome.jsp

<%--
  Created by IntelliJ IDEA.
  User: WT
  Date: 2025/3/25
  Time: 下午6:10
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>这是一个SSM项目Demo</h1>
    <a href="/webssm/users">用户列表</a>
</body>
</html>

list.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>用户列表</title>
</head>
<body>
<h1>用户列表</h1>
<table>
    <tr>
        <th>ID</th>
        <th>姓名</th>
        <th>邮箱</th>
    </tr>
    <c:forEach items="${users}" var="user">
        <tr>
            <td>${user.id}</td>
            <td>${user.name}</td>
            <td>${user.email}</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

参考内容:

SSM工作流程与原理详解_51CTO博客_ssm工作原理

介绍SSM框架 - 看热闹的蓝胖子 - 博客园

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