springmvc项目搭建
SpringMVC项目整合整合mybatis，spring和springMVC1. 环境IDEA+Mysq5.7+Tomca5.7+Maven2. 步骤2.1 先进行maven依赖的导入，pom.xml文件的修改<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0
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SpringMVC项目整合
整合mybatis，spring和springMVC
1. 环境
IDEA+Mysq5.7+Tomca5.7+Maven
2. 步骤
2.1 先进行maven依赖的导入，pom.xml文件的修改
<?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>ssmbuild</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- 依赖：junit，数据库驱动，连接池，servlet，jsp，mybatis，mybatis-spring，spring(springmcv)-->
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</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.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.2</version>
</dependency>
</dependencies>
<!--Maven资源过滤设置，静态资源导出问题-->
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
2.2 配置文件的添加
2.2.1 整合Mybatis
处理dao层的配置文件，mybatis-config.xml和database.properties，但是因为spring-dao.xml的使用，可以不将database.properties导入mybatis-config.xml，反而导入spring-dao.xml中。
****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">
<!--核心配置文件-->
<configuration>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
<!--配置数据源，交给Spring去做-->
<!--取别名-->
<typeAliases>
<!--resultMap:默认类名小写为使用id，启动别名，一般既是小写-->
<package name="com.Rui.pojo"/>
</typeAliases>
<mappers>
<mapper class="com.Rui.dao.BookMapper"/>
</mappers>
</configuration>
****db.properties配置文件，和mysql8略有不同****
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf-8
username=root
password=123456
2.2.2 整合Spring
****spring-dao.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">
<!-- 配置整合mybatis -->
<!-- 1.关联数据库文件 -->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 2.数据库连接池 -->
<!--数据库连接池
dbcp 半自动化操作 不能自动连接
c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
druid 天然日志监控功能
hikari
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 配置连接池属性，四个基础配置，永远不会变 -->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!-- c3p0连接池的私有属性 -->
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<!-- 关闭连接后不自动commit -->
<property name="autoCommitOnClose" value="false"/>
<!-- 获取连接超时时间 10s -->
<property name="checkoutTimeout" value="10000"/>
<!-- 当获取连接失败重试次数 -->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!-- 3.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中，动态利用到了反射 -->
<!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
<!-- 导致了BookMapperImpl的消失，直接创建sqlsession -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.Rui.dao"/>
</bean>
</beans>
****spring-service.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
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描service相关的bean(包) -->
<context:component-scan base-package="com.Rui.service" />
<!-- 将我们所有的业务类，注入spring，可以通过配置或者注解实现 -->
<!--BookServiceImpl注入到IOC容器中-->
<bean id="BookServiceImpl" class="com.Rui.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!-- 配置事务管理器->增删改自动提交 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池(注入数据源) -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- aop事务支持，有了事务管理器其实已经有事务，但没配置切入点 -->
</beans>
本来还要将service中所写的类，比如
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
注入到spring-service.xml中，但这里配合注解@Service，就可以自动扫描注入。
创建applicationContext.xml，来整合spring-dao.xml和spring-service.xml还有剩下此处未写的spring-mvc.xml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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 整合spring的配置文件 -->
<import resource="classpath:spring-dao.xml"/>
<import resource="classpath:spring-service.xml"/>
<import resource="classpath:spring-mvc.xml"/>
</beans>
2.2.3 整合SpringMVC
在Add Frameworks Support处添加web依赖，建立web包，生成web.xml文件，因为controller主要与jsp和web打交道，所以springmvc主要处理controller，和spring有重叠，但是有简化。SpringMVC的核心控制器是dispatchservlet，spring来整合所有的框架！
****web.xml****
<?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">
<!-- DispatchServlet springmvc基于web项目，这里的web.xml就是springmvc的一个核心配置-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 乱码过滤-->
<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>
<!-- Session-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
****spring-mvc.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
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">
<!--1 注解驱动-->
<mvc:annotation-driven/>
<!--2 静态资源过滤-->
<mvc:default-servlet-handler/>
<!--3 扫描包：Controller-->
<context:component-scan base-package="com.ssl.controller"/>
<!--4 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>
配合@Controller使用，本来只spring时要在applicationContext.xml注册的controller bean，现在可以不在spring-mvc.xml中注册，直接扫描注解使用。
3.补充
pojo层和数据库
package com.Rui.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
数据库和pojo对象尽量保持字段同名，然后再dao层使用@Param注解起别名，再mapper.xml文件中的where筛选时使用
比如数据库字段bookID
起别名@Param("bookId")
使用：where bookID = #{bookId}，前者数据库字段，后者java变量名，
若不加别名，可以通过where bookID = #{bookID}匹配，要不则会匹配失败。
值得注意的是：Books queryBookById(@Param("bookId") int id);，int id会一直被bookId取代，不会使用到。
4. dao层
接口
package com.Rui.dao;
import com.Rui.pojo.Books;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface BookMapper {
//增加一本书
int addBook(Books books);
//删除一本书
int deleteBookById(@Param("bookId") int id);
//修改（更新）一本书
int updateBook(Books books);
//查询一本书
Books queryBookById(@Param("bookId") int id);
//查询全部的书
List<Books> queryAllBook();
}
mapper文件
<?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.Rui.dao.BookMapper">
<insert id="addBook" parameterType="Books">
insert into ssmbuild.books (bookName,bookCounts,detail)
values (#{bookName},#{bookCounts},#{detail});
</insert>
<delete id="deleteBookById" parameterType="int">
delete from sumbuild.books where bookID = #{bookId}
</delete>
<update id="updateBook" parameterType="Books">
update sumbuild.books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
where bookID = #{bookID}
</update>
<select id="queryBookById" resultType="Books">
select * from ssmbuild.books
where bookID = #{bookId}
</select>
<select id="queryAllBook" resultType="Books">
select * from ssmbuild.books
</select>
</mapper>
5. service层
****BookService接口****
package com.Rui.service;
import com.Rui.pojo.Books;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public interface BookService {
//增加一本书
int addBook(Books books);
//删除一本书
int deleteBookById(int id);
//修改（更新）一本书
int updateBook(Books books);
//查询一本书
Books queryBookById(int id);
//查询全部的书
List<Books> queryAllBook();
}
实现类BookServiceImpl
package com.Rui.service;
import com.Rui.dao.BookMapper;
import com.Rui.pojo.Books;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class BookServiceImpl implements BookService{
//service业务层调dao层：组合dao层
@Autowired
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
public int addBook(Books books) {
return bookMapper.addBook(books);
}
public int deleteBookById(int id) {
return bookMapper.deleteBookById(id);
}
public int updateBook(Books books) {
return bookMapper.updateBook(books);
}
public Books queryBookById(int id) {
return bookMapper.queryBookById(id);
}
public List<Books> queryAllBook() {
return bookMapper.queryAllBook();
}
}
6. controller层
package com.Rui.controller;
import com.Rui.pojo.Books;
import com.Rui.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController {
//controller 调 service层
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
//查询全部书籍，并且返回到一个书籍展示页
@RequestMapping("/allBook")
public String list(Model model){
List<Books> books = bookService.queryAllBook();
model.addAttribute("list",books);
return "allBook";
}
}
###7. 前端页面（jsp）
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
Created by IntelliJ IDEA.
User: 110
Date: 2022/4/19
Time: 10:40
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>书籍展示</title>
<!-- 新 Bootstrap 核心 CSS 文件 -->
<link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<%-- clearfix清除浮动--%>
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>书籍列表 ------- 显示所有书籍</small>
</h1>
</div>
</div>
</div>
</div>
<div class="row clearfix">
<div class="col-md-12 column">
<table class="table table-hover table-striped">
<thead>
<tr>
<th>书籍编号</th>
<th>书籍名称</th>
<th>书籍数量</th>
<th>书籍详情</th>
</tr>
</thead>
<%-- 书籍从数据库中查询出来，从这个list中遍历出来 --%>
<tbody>
<c:forEach var="book" items="${list}">
<tr>
<td>${book.bookID}</td>
<td>${book.bookName}</td>
<td>${book.bookCounts}</td>
<td>${book.detail}</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</div>
</body>
</html>
jstl获取数据库传来的参数，在前端使用！
8.寄语
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