【SSM】SSM学习笔记-DAY1

SSM框架整合

一、整合环境

（一）整合思路

通过Spring实例化Bean，然后调用实例对象中的查询方法来执行MyBatis映射文件中的SQL语句，如果能够正确查询出数据库中数据，就认为整合成功。

（二）准备jar包

（三）编写配置文件

1.创建项目，导包

2. 创建db.properties，applicationContext.xml，mybatis-config.xml

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_mybatis?serverTimezone=UTC
jdbc.username=root
jdbc.password=root
jdbc.maxTotal=30
jdbc.maxIdle=10
jdbc.initialSize=5

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd

">
<!--    1.连接数据库-->
<!--    读取db.properties-->
    <context:property-placeholder location="db.properties"/>
<!--    配置数据源-->
    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxTotal" value="${jdbc.maxTotal}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
    </bean>

<!--    事务管理器，依赖数据源-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

<!--    注册事务管理器驱动，开启事务注解-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

<!--    配置MyBatis工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        注入数据源-->
        <property name="dataSource" ref="dataSource"/>
<!--        指定核心配置文件位置-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

</beans>

<?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>
<!--    配置别名-->
    <typeAliases>
        <package name="com.ssm.po"/>
    </typeAliases>
</configuration>

3.在config文件夹创建springmvc-config.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:mvc="http://www.springframework.org/schema/mvc"
       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
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
    <!-- 指定需要扫描的包-->
    <context:component-scan base-package="com.ssm.controller"/>

    <!--    配置注解驱动-->
    <mvc:annotation-driven/>
    <!--    定义视图解析器-->
    <bean id="viewResoler" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--    设置前提-->
        <property name="prefix" value="/jsp/"/>
        <!--    设置后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>


</beans>

4.配置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">
<!--    配置加载Spring文件的监听器-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--    编码过滤器-->
    <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>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>*.action</url-pattern>
    </filter-mapping>

    <servlet>
        <!--        配置前端过滤器-->
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--        初始化加载配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-config.xml</param-value>
        </init-param>
        <!--        表示容器在启动时立即加载servlet-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
</web-app>

二、整合测试

1、创建po包，User

package com.ssm.po;

public class User {
    private Integer id;
    private String username;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

2.创建dao包，创建接口UserDao和映射文件UserDao.xml

package com.ssm.dao;

import com.ssm.po.User;

public interface UserDao {
    public User findUserById(Integer id);
}

<?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>
    <select id="findUserById" parameterType="Integer" resultType="User">
        select * from t_user where id=#{id}
    </select>
</mapper>

3.创建service包，接口文件UserService

package com.ssm.service;

import com.ssm.po.User;

public interface UserService {
    public User findUserById(Integer id);
}

4.创建service.impl包，UserServiceImpl

package com.ssm.service.impl;

import com.ssm.dao.UserDao;
import com.ssm.po.User;
import com.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service

@Transactional
public class UserServiceImpl implements UserService {
//    注解注入UserDao
    @Autowired
    private UserDao userDao;
    @Override
    public User findUserById(Integer id) {

        return this.userDao.findUserById(id);
    }
}

5.创建controller，UserController

package com.ssm.controller;

import com.ssm.po.User;
import com.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class UserController {
    @Autowired
    private UserService userService;
    
    @RequestMapping("/findUserById")
    public String findUserById(Integer id, Model model){
        User user=userService.findUserById(id);
        model.addAttribute("user",user);
        
        return "user";
    }
    
}

6.创建jsp文件夹，user.jsp

<%--
  Created by IntelliJ IDEA.
  User: ZhShy
  Date: 2020/1/17
  Time: 9:57
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>用户信息</title>
</head>
<body>
<table>
    <tr>
        <td>用户ID</td>
        <td>${user.id}</td>
    </tr>
    <tr>
        <td>用户姓名</td>
        <td>${user.username}</td>
    </tr>
</table>
</body>
</html>

7.启动项目