也学了一会SSM框架了,作为初学者学的还是比较头疼的
emmm大概就是配置两小时代码五分钟的感觉
这次想写一个简单的书籍管理系统练练手
顺便写一个万用的模板给未来用(配置真的好累啊pwwwwp
这篇博客只含有配置的相关信息 文中最底部有源码的下载链接
因为还是初学者难免会有错误,如果您发现我有错误的地方烦请在博客中评论指出或联系[email protected]
IDEA 2020.1
Mysql 8.0.19
SQLyog
Tomcat 9(文中没有提配置问题
创建数据库
CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8
INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');
(4,'SwordAO',25,'虽然是游戏但可不是闹着玩的');
创建完项目后需要做的就是导入依赖啦
我们要在maven里要解决两个问题
一个是依赖导入问题
首先看看我们需要的依赖
junit
JUnit是一个Java语言的单元测试框架。@Test什么的都要它
数据库驱动
emmm就不需要解释了吧(在这里我用的是c3p0 dbcp什么的也可以
连接池
数据库连接池负责分配、管理和释放数据库连接,它允许应用程序重复使用一个现有的数据库连接,而不是再重新建立一个;
servlet&&jsp
Servlet 是运行在 Web 服务器或应用服务器上的程序,它是作为来自 Web 浏览器或其他 HTTP 客户端的请求和 HTTP 服务器上的数据库或应用程序之间的中间层。
写web都要导入这俩吧(x
mybatis
万恶之源
mybatis-spring
万恶之源
spring
万恶之源
在pom.xml里添加
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.19</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</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>2.1</version>
</dependency>
<dependency>
<groupId>jstl</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>2.0.5</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
</dependencies>
另一个是静态资源导出问题
在pom.xml里添加
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties
**/ *.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties
**/ *.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
输入User和Password就好啦
注意要先调好时区哦
连接成功之后选择我们刚刚创建好的数据库
需要的包:
pojo(Plain Ordinary Java Object简单的Java对象 就是实体类)
dao(或者叫mapper)
service(业务层)
controller
mybatis-config.xml (mybatis的核心配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper>
<!-- 配置数据源 交给Spring去做-->
<typeAliases>
<package name="test.pojo"/>
</typeAliases>
</mapper>
applicationContext.xml (spring的核心配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/springbeans.xsd">
</beans>
database.properties
jdbc.driver=com.mysql.cj.jdbc.Driver
#如果使用的是MySql8.0+ 增加一个时区的配置 &serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?
useSSL=true&useUnicode=true&characterEncoding=utf&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=123456
现在我们就有这么多东西啦 然后我们来创建一个实体类对象(pojo)Books
package test.pojo;
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
这里再加上有参无参构造方法和setget方法以及toString
按ALT+INSERT就好啦
想偷懒的话在依赖那里加一个lombok(不过好像更慢…
写完实体类的话我们需要写一个接口来进行一些操作
在dao层写一个吧
BookMapper
package test.dao;
import test.pojo.Books;
import java.util.List;
public interface BookMapper {
//增加一本书
int addBook(Books books);
//删除一本书
int deleteBookById(int id);
//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();
}
写完接口之后写一个BookMapper.xml(还在dao层
一个mapper对应一个接口
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test.dao.BookMapper">
<insert id="add" parameterType="Books">
insert into ssmbuild.books (bookName, bookCounts, detail)
values (#{
bookName}.#{
bookCounts},#{
detail});
</insert>
<delete id="deleteBookById" parameterType="int">
delete from ssmbuild.books where bookID = #{
id}
</delete>
<update id="updateBook" parameterType="Books">
update ssmbuild.books
set bookName = #{
bookName},bookCounts =#{
bookCounts},detail=#{
detail}
where bookID=#{
bookID}
</update>
<select id="queryBookById" resultType="Books">
select * from ssmbuild.books where bookID = #{
id}
</select>
<!--查询全部Book-->
<select id="queryAllBook" resultType="Books">
SELECT * from ssmbuild.books
</select>
</mapper>
然后把BookMapper.xml绑定在mybatis的配置文件中
添加这一段在mybatis-config.xml里
<typeAliases>
<package name="test.pojo"/>
</typeAliases>
<mappers>
<mapper resource="test/dao/BookMapper.xml"/>
</mappers>
创建BookService接口
package test.service;
import test.pojo.Books;
import java.util.List;
public interface BookService {
//增加一本书
int addBook(Books books);
//删除一本书
int deleteBookById(int id);
//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();
}
记住业务层调Dao层
创建BookServiceImpl
package test.service;
import org.springframework.stereotype.Service;
import test.dao.BookMapper;
import test.service.BookService;
import test.pojo.Books;
import java.util.List;
@Service
public class BookServiceImpl implements BookService {
// Service调dao层:组合dao
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();
}
}
dao和service就是MVC的M层(model)
在resources创建spring-dao.xml
关联数据库配置文件
连接池
<?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">
<!--1 关联数据库配置-->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 2 连接池
dbcp: 半自动化操作 不能自动连接
c3p0: 自动化操作(自动化的加载配置文件 并且可以设置到对象中)
hikari:
这里先用c3p0-->
<!-- <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"/>-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<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 -->
<property name="checkoutTimeout" value="10000"/>
<!-- 当获取连接失败重试次数 -->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!-- 3 sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 绑定Mybatis的配置文件-->
<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 -->
<!--解释 : https://www.cnblogs.com/jpfss/p/7799806.html-->
<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="test.dao"/>
</bean>
</beans>
创建spring-service.xml
扫描service的包
将我们所有业务类注入Spring
<?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">
<!-- 扫描service下的包-->
<context:component-scan base-package="test.service"/>
<!--BookServiceImpl注入到IOC容器中-->
<bean id="BookServiceImpl" class="test.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
然后选择web.xml进行编写
DispatchServlet
乱码过滤
<?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">
<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>
<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>/*
15
在resources下创建springmvc.xml
修改resources下的applicationContext.xml
添加
在web/WEB-INF下创建文件夹jsp
修改resources下的springmvc.xml
注解驱动
静态资源过滤
扫描包
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:mvc="http://www.springframework.org/schema/mvc"
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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 注解驱动-->
<mvc:annotation-driven/>
<!-- 静态资源过滤-->
<mvc:default-servlet-handler/>
<!-- 扫描包:controller-->
<context:component-scan base-package="test.controller"/>
<!-- 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>
还在审核中