开发环境: macos IDEA 2021
mysql8.0, toma9.0
源码: https://download.youkuaiyun.com/download/a2267542848/19730797
1 基本环境搭建
1 新建工程
新建后整个目录如下
2 添加tomcat配置
选择tomcat server local
deployment添加artifacts exploded
war模式这种可以称之为是发布模式，看名字也知道，这是先打成war包，再发布
war exploded模式是直接把文件夹、jsp页面 、classes等等移到Tomcat 部署文件夹里面，进行加载部署。因此这种方式支持热部署，一般在开发的时候也是用这种方式。
从这里可以看到之后的访问路径
点击运行, 在会自动打开浏览器,如果出现下面的hello world 那证明当前环境没问题
2 加入spring
1 加入spring框架
在工程上右键, add framework support, 选择spring mvc , 会自动下载spring的库和添加WEB-INF下的配置
2 新建目录
在main 下新建java和resources, 在src下新建test/java
点击到project structure为这些文件夹添加属性
java添加sources, resources添加Resources,test/java添加Tests
设置完之后会变颜色
3 新建spring 目录
在java下新建如下的目录,test也新建 com.ssm.kirito是包名字, 这是我取的
controller是控制器
dao是mapper interface
entity是pojo
exception是异常处理
service是 服务和impl实现
util是工具
mapper是mapper xml
spring是spring配置
4 新建spring, mybatis,jdbc文件
新建配置如下图
通过如下方法添加spring xml 和jdbc.properties
5 添加依赖修改pom.xml
在pom.xml中添加如下依赖
点击这图标会自动下载
注意数据库的版本,这个在下一章会讲
<!-- 1.日志 -->
<!-- 实现slf4j接口并整合 -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.1</version>
</dependency>
<!-- 2.数据库 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.25</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- DAO: MyBatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.3</version>
</dependency>
<!-- 3.Servlet web -->
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<!-- 4.Spring -->
<!-- 1)Spring核心 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!-- 2)Spring DAO层 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!-- 3)Spring web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!-- 4)Spring test -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<!-- redis客户端:Jedis -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>com.dyuproject.protostuff</groupId>
<artifactId>protostuff-core</artifactId>
<version>1.0.8</version>
</dependency>
<dependency>
<groupId>com.dyuproject.protostuff</groupId>
<artifactId>protostuff-runtime</artifactId>
<version>1.0.8</version>
</dependency>
<!-- Map工具类 -->
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2</version>
</dependency>6 添加数据库的支持jdbc.properties
我用的是mysql8.0.25, 如果是低版本就用com.mysql.jdbc.Driver
数据库名字是book
注意不要用引号,不要有空格
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/book?useSSL=true&characterEncoding=utf-8&serverTimezone=GMT
jdbc.username=root
jdbc.password=1237 添加mybatis和logback支持
logback.xml 文件修改如下
<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are by default assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder -->
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="debug">
<appender-ref ref="STDOUT" />
</root>
</configuration>mybatis-config.xml文件修改如下
<?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>
<!-- 配置全局属性 -->
<settings>
<!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 -->
<setting name="useGeneratedKeys" value="true" />
<!-- 使用列别名替换列名 默认:true -->
<setting name="useColumnLabel" value="true" />
<!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} -->
<setting name="mapUnderscoreToCamelCase" value="true" />
</settings>
</configuration>8 添加spring配置
注意com.ssm.kirito替换为自己的包
spring-dao.xml修改如下
<?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">
<!-- 配置整合mybatis过程 -->
<!-- 1.配置数据库相关参数properties的属性：${url} -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- 2.数据库连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 配置连接池属性 -->
<property name="driverClass" value="${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.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" />
<!-- 扫描entity包 使用别名 -->
<property name="typeAliasesPackage" value="com.ssm.kirito.entity" />
<!-- 扫描sql配置文件:mapper需要的xml文件 -->
<property name="mapperLocations" value="classpath:mapper/*.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 -->
<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.ssm.kirito.dao" />
</bean>
</beans>spring-service.xml修改如下
<?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
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 扫描service包下所有使用注解的类型 -->
<context:component-scan base-package="com.ssm.kirito.service" />
<!-- 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>
<!-- 配置基于注解的声明式事务 -->
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>spring-web.xml修改如下
<?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
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<!-- 配置SpringMVC -->
<!-- 1.开启SpringMVC注解模式 -->
<!-- 简化配置：
(1)自动注册DefaultAnootationHandlerMapping,AnotationMethodHandlerAdapter
(2)提供一些列：数据绑定，数字和日期的format @NumberFormat, @DateTimeFormat, xml,json默认读写支持
-->
<mvc:annotation-driven />
<!-- 2.静态资源默认servlet配置
(1)加入对静态资源的处理：js,gif,png
(2)允许使用"/"做整体映射
-->
<mvc:default-servlet-handler/>
<!-- 3.配置jsp 显示ViewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 4.扫描web相关的bean -->
<context:component-scan base-package="com.ssm.kirito.controller" />
</beans>删除applicationContext.xml和dispatcher.servlet.xml
修改web.xml如下, 只有修改了这个 spring才有效
<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_3_1.xsd"
version="3.1" metadata-complete="true">
<!-- 如果是用mvn命令生成的xml，需要修改servlet版本为3.1 -->
<!-- 配置DispatcherServlet -->
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置springMVC需要加载的配置文件
spring-dao.xml,spring-service.xml,spring-web.xml
Mybatis - > spring -> springmvc
-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring-*.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<!-- 默认匹配所有的请求 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
3 编写数据库,编写DAO,control等
到目前为止,我们的环境已经搭建好了, 现在开始加入编写数据库,然后编写对象,和control, 和jsp等
1 数据库编写
可以进入到nvcat手动新建一个book的数据库, 表名字为book, 然后插入数据
也可以执行SQL语句
CREATE DATABASE `book`;
USE `book`;
DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`filename` varchar(40) NOT NULL,
`fileurl` varchar(255) NOT NULL,
`isdel` int(4) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
INSERT INTO `book` VALUES ('1', 'book1', '345', '0');
INSERT INTO `book` VALUES ('2', 'book2', '123', '1');2 新建entity POJO
book.java
这个是上面的sql对应的对象, 这个和mapper 可以用工具生成
package com.ssm.kirito.entity;
public class Book {
/**
* 上传的文件
*/
private Integer id;
/**
* 文件名称
*/
private String filename;
/**
* 文件地址
*/
private String fileurl;
/**
* 是否删除（0否 1是）
*/
private Integer isdel;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getFilename() {
return filename;
}
public void setFilename(String filename) {
this.filename = filename;
}
public String getFileurl() {
return fileurl;
}
public void setFileurl(String fileurl) {
this.fileurl = fileurl;
}
public Integer getIsdel() {
return isdel;
}
public void setIsdel(Integer isdel) {
this.isdel = isdel;
}
}
3 新建dao 数据库操作
这是对数据库的具体操作,比如查找,插入等
dao/BookDao.java
package com.ssm.kirito.dao;
import com.ssm.kirito.entity.Book;
public interface BookDao {
Book selectByPrimaryKey(Integer id);
}
对应的具体实现resources/mapper/BookMapper.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.ssm.kirito.dao.BookDao">
<resultMap id="BaseResultMap" type="com.ssm.kirito.entity.Book">
<!--@mbg.generated-->
<!--@Table file-->
<id column="id" jdbcType="INTEGER" property="id" />
<result column="filename" jdbcType="VARCHAR" property="filename" />
<result column="fileurl" jdbcType="VARCHAR" property="fileurl" />
<result column="isdel" jdbcType="INTEGER" property="isdel" />
</resultMap>
<sql id="Base_Column_List">
<!--@mbg.generated-->
id, filename, fileurl, isdel
</sql>
<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
<!--@mbg.generated-->
select
<include refid="Base_Column_List" />
from book
where id = #{id,jdbcType=INTEGER}
</select>
</mapper>4 新建service 服务
这是具体的服务
service/BookService.java
package com.ssm.kirito.service;
import com.ssm.kirito.entity.Book;
public interface BookService {
Book findbook(Integer id);
}
具体的实现 service/impl/BookServiceImpl.java
package com.ssm.kirito.service.impl;
import com.ssm.kirito.dao.BookDao;
import com.ssm.kirito.entity.Book;
import com.ssm.kirito.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class BookServiceImpl implements BookService {
@Autowired
private BookDao bookDao;
@Override
public Book findbook(Integer id) {
return bookDao.selectByPrimaryKey(id);
}
}
5 新建具体web访问的接口 controller 和jsp
在web下新建jsp
WEB-INF/jsp/show.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>展示数据</h3>
<div>文件id：${book.id}</div>
<div>文件名称：${book.filename}</div>
<div>文件地址：${book.fileurl}</div>
</body>
</html>
controller/BookController.java
package com.ssm.kirito.controller;
import com.ssm.kirito.entity.Book;
import com.ssm.kirito.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
@Controller
@RequestMapping("/getbook")
public class BookController {
@Autowired
private BookService bookService;
@RequestMapping("test")
public String getDataById(HttpServletRequest request){
Integer id = 1;
Book book = bookService.findbook(id);
request.setAttribute("book",book);
return "show";
}
}
访问路径为: /getbook/test 就会去数据库请求ID为1的数据, 就会返回show.jsp
6 运行
到此所有的工作已经完成, 平时不建议用JSP, 实际上用前后端分离
本项目代码为: https://download.youkuaiyun.com/download/a2267542848/19730797
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