环境和工具
- maven
- idea
- mysql
- tomcat
初始目录结构
.
├── pom.xml
├── src
│ ├── main
│ │ ├── java
│ │ ├── resources
│ │ └── webapp
│ │ ├── index.jsp
│ │ └── WEB-INF
│ │ └── web.xml
│ └── test
│ └── java
└── SSMDemo.iml
配置项目结构标记文件夹类型:
配置 pox.xml 导入依赖
<?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>website.yuchen</groupId>
<artifactId>SSHDemo</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>SSHDemo Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>https://www.yuchen.website</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<spring.version>5.1.4.RELEASE</spring.version>
<mysql.version>8.0.15</mysql.version>
<servlet.version>4.0.1</servlet.version>
<mybatis.version>3.5.0</mybatis.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.0</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.3</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
</project>
web.xml 配置
配置SpringMVC的 DispatcherServlet:配置 servlet
与servlet-mapping
:
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<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">
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>SpringMVC-Dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/spring/*.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC-Dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
配置的init-param
的内容标识了更多需要加载Spring的配置项,所以需要在 resources 资源文件夹下创建 config/spring 文件夹,关于 spring 的配置文件都放在这个文件夹下
当编译好了项目之后,配置项中的classpath就对应了 target
目录下的 classes
也就是说我们的 spring 配置文件在编译之后放在 target/classes/config/spring/
(war 模式)
Spring 整合
分别创建:持久层、业务层、控制层 对应的配置文件:
持久层
dao.xml 配置整合Mybatis:
<?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">
<context:property-placeholder location="classpath:config/mybatis/jdbc.properties"/>
<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}"/>
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<property name="autoCommitOnClose" value="false"/> <!-- 关闭连接后不自动commit -->
<property name="checkoutTimeout" value="10000"/> <!-- 获取连接超时时间 -->
<property name="acquireRetryAttempts" value="2"/> <!-- 当获取连接失败重试次数 -->
</bean>
<!--Mybatis配置整合-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:config/mybatis/mybatisConfig.xml"/>
<property name="typeAliasesPackage" value="website.yuchen.model"/>
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="website.yuchen.dao"/>
</bean>
</beans>
以上使用的是 c3p0 连接池,从 jdbc.properties 文件中加载JDBC配置,所以在对应路径 config/mybatis 下创建 jdbc.properties:
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/SSMDemo?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=
注意MySQL的连接版本,这里我使用的是8.0以上的版本
以上dao.xml的配置还需要 config/mybatis/mybatisConfig.xml 的配置,所以创建对应文件:
<?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>
</configuration>
这里就用默认 Mybatis 的默认配置
以上就完成了Spring和Mybatis的整合,由Spring来托管核心对象sqlSessionFactory
业务层
创建业务层对应的 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"
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">
<context:component-scan base-package="website.yuchen.service" />
<tx:annotation-driven transaction-manager="transactionManager" /> <!--@Transactional注解-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
控制层
用于 Spring MVC 的配置:创建 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
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">
<context:component-scan base-package="website.yuchen.controller" />
<mvc:annotation-driven />
<mvc:default-servlet-handler/> <!--用于静态资源处理-->
<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>
</beans>
持久层设计
创建数据库
根据之前在 jdbc.properties 中的设置:
create database SSMDemo;
use SSMDemo;
create table User (
id int primary key auto_increment,
name varchar(11) default "XXX",
age int default 0,
address varchar(21)
);
insert into User values(1, "AAA", 21, "Shanghai");
insert into User values(2, "BBB", 19, "Beijing");
insert into User values(3, "CCC", 22, "Hangzhou");
在作为Source的java文件夹下创建包website.yuchen.model
,编写 User 表对应的 PO 对象UserBean
:
package website.yuchen.model;
public class UserBean
{
private Integer id, age;
private String name, address;
public Integer getId() {return id;}
public void setId(Integer id) {this.id = id;}
public Integer getAge() {return age;}
public void setAge(Integer age) {this.age = age;}
public String getName() {return name;}
public void setName(String name) {this.name = name;}
public String getAddress() {return address;}
public void setAddress(String address) {this.address = address;}
}
另外创建包website.yuchen.dao
,编辑 CRUD 操作:
package website.yuchen.dao;
import website.yuchen.model.UserBean;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface UserMapper {
public void insert(UserBean user);
public UserBean findById(Integer id);
public void update(UserBean user);
public void deleteById(Integer id);
public List<UserBean> findAll();
}
于是在resources下另外创建 mapper 文件夹并创建这些操作的配置UserMapper.xml
,即 resources/mapper/UserMapper.xml
:这个路径已经在之前的 dao.xml 中配置好了:
<?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="website.yuchen.dao.UserMapper">
<insert id="insert" parameterType="UserBean">
insert into User(id, name, age, address)
values(#{id}, #{name}, #{age}, #{address})
</insert>
<delete id="deleteById" parameterType="Integer">
delete from User where id=#{id}
</delete>
<update id="update" parameterType="UserBean">
update User set name=#{name}, age=#{age},
address=#{address} where id=#{id}
</update>
<select id="findById" parameterType="Integer" resultType="UserBean">
select * from User where id=#{id}
</select>
<select id="findAll" resultType="UserBean">
select * from User;
</select>
</mapper>
业务层设计
业务层主要用于对持久层提供的数据封装再处理,同样创建包 website.yuchen.service
,并定义业务接口以及它的实现类:
package website.yuchen.service;
import website.yuchen.model.UserBean;
import java.util.List;
public interface IUserService {
public void insert(UserBean user);
public UserBean findById(Integer id);
public void update(UserBean user);
public void deleteById(Integer id);
public List<UserBean> findAll();
}
package website.yuchen.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import website.yuchen.dao.UserMapper;
import website.yuchen.model.UserBean;
import java.util.List;
@Service
public class UserService implements IUserService
{
@Autowired
private UserMapper userMapper;
@Override
public void insert(UserBean user) {
userMapper.insert(user);
}
@Override
public UserBean findById(Integer id) {
return userMapper.findById(id);
}
@Override
public void update(UserBean user) {
userMapper.update(user);
}
@Override
public void deleteById(Integer id) {
userMapper.deleteById(id);
}
@Override
public List<UserBean> findAll() {
return userMapper.findAll();
}
}
控制层
这部分是关于Spring MVC中 Controller 的配置:创建包 website.yuchen.controller
以及UserController
类:
package website.yuchen.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import website.yuchen.model.UserBean;
import website.yuchen.service.UserService;
import java.util.List;
@Controller
public class UserController
{
@Autowired
private UserService userService;
@RequestMapping
public String display(Model model)
{
List<UserBean> userList = userService.findAll();
model.addAttribute("userList", userList);
return "index";
}
@RequestMapping("addPage")
public String add() {
return "addPage";
}
@RequestMapping(value = "add", method = RequestMethod.POST)
public String add(UserBean user) {
userService.insert(user);
return "redirect:index";
}
@RequestMapping("deletePage")
public String delete() {
return "deletePage";
}
@RequestMapping(value = "delete", method = RequestMethod.POST)
public String delete(Integer id) {
userService.deleteById(id);
return "redirect:index";
}
}
由Spring MVC在配置的视图映射文件,在WEB-INF下新建 jsp 文件夹,视图的jsp文件都保存在这个文件夹下:
创建 index.jsp 用于展示所有的元组,借助 jstl 循环显示表格:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>SSM Demo</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<meta charset="UTF-8">
</head>
<body>
<h2 class="page-header"> User表显示所有字段 </h2>
<table>
<tr>
<td><button type="button" class="btn btn-primary" onclick="window.location.href='addPage'">添加</button></td>
<td><button type="button" class="btn btn-success" onclick="window.location.href='deletePage'">删除</button></td>
</tr>
</table>
<table class="table table-hover table-striped">
<tr>
<th>编号</th>
<th>名字</th>
<th>年龄</th>
<th>地址</th>
</tr>
<c:forEach var="user" items='${userList}'>
<tr>
<td>${user.id}</td>
<td>${user.name}</td>
<td>${user.age}</td>
<td>${user.address}</td>
</tr>
</c:forEach>
</table>
</body>
</html>
再分别加入添加 addPage.jsp 和删除 deletePage.jsp 页面:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>SSM Demo</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<meta charset="UTF-8">
</head>
<body>
<h2 class="page-header"> User表添加字段 </h2>
<form action="add" method="post">
<div class="form-group">
<label>id</label>
<input name="id" type="text" class="form-control" placeholder="id">
</div>
<div class="form-group">
<label>name</label>
<input name="name" type="text" class="form-control" placeholder="name">
</div>
<div class="form-group">
<label>age</label>
<input name="age" type="text" class="form-control" placeholder="age">
</div>
<div class="form-group">
<label>address</label>
<input name="address" type="text" class="form-control" placeholder="address">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</body>
</html>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>SSM Demo</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<meta charset="UTF-8">
</head>
<body>
<h2 class="page-header"> User表删除字段 </h2>
<form action="delete" method="post">
<div class="form-group">
<label>id</label>
<input name="id" type="text" class="form-control" placeholder="id">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</body>
</html>
最终目录结构
.
├── pom.xml
├── src
│ ├── main
│ │ ├── java
│ │ │ └── website
│ │ │ └── yuchen
│ │ │ ├── controller
│ │ │ │ └── UserController.java
│ │ │ ├── dao
│ │ │ │ └── UserMapper.java
│ │ │ ├── model
│ │ │ │ └── UserBean.java
│ │ │ └── service
│ │ │ ├── IUserService.java
│ │ │ └── UserService.java
│ │ ├── resources
│ │ │ ├── config
│ │ │ │ ├── mybatis
│ │ │ │ │ ├── jdbc.properties
│ │ │ │ │ └── mybatisConfig.xml
│ │ │ │ └── spring
│ │ │ │ ├── dao.xml
│ │ │ │ ├── mvc.xml
│ │ │ │ └── service.xml
│ │ │ └── mapper
│ │ │ └── UserMapper.xml
│ │ └── webapp
│ │ └── WEB-INF
│ │ ├── jsp
│ │ │ ├── addPage.jsp
│ │ │ ├── deletePage.jsp
│ │ │ └── index.jsp
│ │ └── web.xml
│ └── test
│ └── java
└── SSMDemo.iml
项目下载:SSM-Demo
参考
(超详细、适合新手入门)IDEA+Maven 整合SSM框架实现简单的增删改查
SpringMVC系列(十)(处理静态资源)和