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SSM项目搭建

发表于 2022-04-07 更新于 2022-04-08 分类于后端， SSM框架

一、常用依赖包

<dependencies>
    <!-- spring-webmvc包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.15</version>
    </dependency>

    <!-- servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>

    <!-- thymeleaf-spring5视图解析 -->
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf-spring5</artifactId>
        <version>3.0.12.RELEASE</version>
    </dependency>

    <!-- mysql连接器 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.27</version>
    </dependency>

    <!-- mybatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.6</version>
    </dependency>

    <!-- junit单元测试 -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.1</version>
        <scope>test</scope>
    </dependency>

    <!-- lombok插件快速生成get/set -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.20</version>
        <scope>provided</scope>
    </dependency>

</dependencies>

二、环境配置

2.1 创建webapp

在main目录下创建webapp目录
- 创建webapp/WEB-INF
- 创建webapp/WEB-INF/templates
- 创建webapp/WEB-INF/web.xml
web.xml配置

<!--
<?xml version="1.0" encoding="UTF-8"?>
-->

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--  配置过滤器  -->
    <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>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!--配置过滤器，用于将前端表单的get/post请求转换为put/delete请求-->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!--  配置SpringMVC前端控制器，对浏览器发送的请求进行统一处理  -->
    <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <!--    配置SpringMVC配置文件的位置和名称，然后在reources中创建xml配置文件    -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>

        <!--    将前端控制器DispatcherServlet启动时间提前到服务器启动的时候    -->
        <!--    提升第一次访问的速度    -->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <!--
            设置SpringMVC核心控制器所能处理的请求路径
            / 所匹配的请求可以是/login或.html/.css/.js等方式的请求路径
            但不匹配.jsp请求路径的请求

        -->
        <servlet-name>springMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

2.1 SpringMVC配置

自动扫描包要改成自己的包环境
配置Thymeleaf视图解析器

<!--
<?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 http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 自动扫描包，包命改成自己的包环境 -->
    <context:component-scan base-package="com.personal"/>

    <!-- 配置Thymeleaf视图解析器 -->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">

                        <!-- 视图前缀 -->
                        <property name="prefix" value="/WEB-INF/templates/"/>

                        <!-- 视图后缀 -->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
</beans>

2.2 Mybatis配置

创建resources/db.properties数据库配置文件

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/personalsystem?useSSL=true&useUnicode=true&characterEncoding=UTF-8
username=root
password=xxx

创建resources/mybatis.xml
- properties加载数据库配置文件标签不能少
- mappers标签配置我们的dao层配置文件路径

<?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>
    <properties resource="db.properties"/>

    <settings>
        <!--显示开启全局缓存，默认是开启的-->
        <setting name="cacheEnabled" value="true"/>
    </settings>
    
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    
    <!--对应我们的xxxMapper.xml路径-->
    <mappers>
        <mapper resource="com/personal/dao/UserMapper.xml"/>
    </mappers>
</configuration>

开启资源路径访问，请配置到pom.xml文件中，否则xxxMapper.xml无法被访问到而导致程序报错

<!--  配置资源导出,防止dao层中的xml无法访问而报错  -->
    <build>
        <resources>
            <resource>
                <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>

2.3 创建实体类和Mapper

2.3.1 创建实体类

package com.personal.pojo;

import lombok.Data;

@Data
public class User {
    private Integer id;
    private String username;
    private String password;
    private Integer role;
}

2.3.2 创建Mapper

<?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">

<!--绑定命名空间,绑定自己的dao层接口-->
<mapper namespace="com.personal.dao.UserMapper">
    <select id="getUserList" resultType="com.personal.pojo.User">
        select * from personalsystem.user;
  </select>
</mapper>

三、日志

本文作者： 故事开头
本文链接： https://cnovelist.github.io/2022/04/07/SSM项目搭建/
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