目录

Life in Flow

知不知,尚矣;不知知,病矣。
不知不知,殆矣。

X

SSM

需求和步骤分析

 使用ssm框架完成对 account 表的增删改查操作

 步骤分析

1. 准备数据库和表记录
2. 创建web项目
3. 编写mybatis在ssm环境中可以单独使用
4. 编写spring在ssm环境中可以单独使用
5. spring整合mybatis
6. 编写springMVC在ssm环境中可以单独使用
7. spring整合springMVC

环境搭建

创建web项目,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>com.soulboy</groupId>
    <artifactId>ssm</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--指定编码及版本-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <java.version>1.11</java.version>
        <maven.compiler.source>1.11</maven.compiler.source>
        <maven.compiler.target>1.11</maven.compiler.target>
    </properties>

    <!-- 打包方式 -->
    <packaging>war</packaging>

</project>

环境搭建

  1. 准备数据库和表记录
CREATE DATABASE spring_db
use `spring_db`

CREATE TABLE `account` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`name` VARCHAR(32) DEFAULT NULL,
`money` DOUBLE DEFAULT NULL,
PRIMARY KEY (`id`)
);

INSERT INTO `account`(`id`,`name`,`money`) VALUES (5,'tom',1000),(6,'jerry',1000)

编写mybatis在ssm环境中可以单独使用

 需求:基于mybatis先来实现对account表的查询

  1. 相关坐标
<!--mybatis坐标-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.15</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
  1. Account实体
package com.soulboy.domain;

public class Account {
    private Integer id;
    private String name;
    private Double money;

    public Account(Integer id, String name, Double money) {
        this.id = id;
        this.name = name;
        this.money = money;
    }

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

3.AccountDao接口

package com.soulboy.dao;

import com.soulboy.domain.Account;

import java.util.List;

public interface AccountDao {
    /*
        查询所有
     */
    public List<Account> findAll();
}
  1. AccountDao.xml映射 (路径resources: com/soulboy/dao/AccountDao.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.soulboy.dao.AccountDao">
    <select id="findAll" resultType="Account">
        select * from account
    </select>
</mapper>
  1. mybatis核心配置文件

src/main/resources/SqlMapConfig.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">

<configuration>
    <!-- 加载properties文件 -->
    <properties resource="jdbc.properties"></properties>
    <!-- 设置别名 -->
    <typeAliases>
        <!-- 方式一: 给单个实体起别名 -->
        <!-- <typeAlias type="com.soulboy.domain.User" alias="user"></typeAlias> -->
        <!-- 方式二: 批量起别名 -->
        <package name="com.soulboy.domain"/>
    </typeAliases>
    <!-- 运行环境 -->
    <environments default="development">
        <environment id="development">
            <!-- 当前的事务交由JDBC进行管理 -->
            <transactionManager type="JDBC"></transactionManager>
            <!-- 数据源信息 POOLED:使用Mybatis的连接池  UNPOOLED:不使用连接池,每一次请求都会创建连接-->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 引入映射配置文件 -->
    <mappers>
        <!-- 使用该方式: XML文件的全路径-->
        <!--<mapper resource="com.soulboy/mapper/UserMapper.xml"></mapper>-->

        <!-- 使用该方式: 接口和映射文件需要同包同名 -->
        <!--<mapper class="com.soulboy.mapper.UserMapper"></mapper>-->

        <!-- 批量加载映射: Mapper接口的包路径 -->
        <package name="com.soulboy.dao"/>
    </mappers>
</configuration>

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:50000/spring_db?useSSL=false
jdbc.username=root
jdbc.password=123456
  1. 测试代码
    com/soulboy/test/MybatisTest.java
package com.soulboy.test;

import com.soulboy.dao.AccountDao;
import com.soulboy.domain.Account;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class MybatisTest {
    @Test
    public void testMybatis() throws IOException {
        InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        AccountDao accountDao = sqlSession.getMapper(AccountDao.class);
        List<Account> accountList = accountDao.findAll();
        for (Account account : accountList) {
            System.out.println(account);
        }
        sqlSession.close();
    }
}

编写spring在ssm环境中可以单独使用

1.相关坐标

<!-- spring依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <!-- aspectj的织入(切点表达式需要用到该jar包) -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.14</version>
        </dependency>
        <!--此处需要注意的是,spring5 及以上版本要求 junit 的版本必须是 4.12 及以上-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
  1. AccountService接口
package com.soulboy.service;

import com.soulboy.domain.Account;

import java.util.List;

public interface AccountService {
    public List<Account> findAll();
}
  1. AccountServiceImpl实现
package com.soulboy.service.impl;

import com.soulboy.dao.AccountDao;
import com.soulboy.domain.Account;
import com.soulboy.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;

    @Override
    public List<Account> findAll() {
       //System.out.println("findAll执行了……");
        List<Account> list = accountDao.findAll();
        return list;
    }
}
  1. spring核心配置文件

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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/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">

    <!--注解扫描-->
    <context:component-scan base-package="com.soulboy"></context:component-scan>
    
</beans>
  1. 测试代码
package com.soulboy.test.spring;

import com.soulboy.service.AccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest {
    @Autowired
    private AccountService accountService;

    @Test
    public void testSpring() {
        accountService.findAll();
    }
}

spring整合mybatis

  1. 整合思想
    将mybatis接口代理对象的创建权交给spring管理,我们就可以把dao的代理对象注入到service中,此时也就完成了spring与mybatis的整合了。
  2. 导入整合包
<!--mybatis整合spring坐标-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
  1. spring配置文件管理mybatis
    注意:此时可以将mybatis主配置文件删除。

src/main/resources/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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/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">

    <!--注解扫描-->
    <context:component-scan base-package="com.soulboy"></context:component-scan>

    <!--spring整合mybatis-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--SqlSessionFactory创建交给spring的IOC容器-->
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--数据库环境配置-->
        <property name="dataSource" ref="dataSource"/>
        <!--类型别名配置-->
        <property name="typeAliasesPackage" value="com.soulboy.domain"/>
        <!--如果要引入mybatis主配置文件,可以通过如下配置-->
        <!--<property name="configLocation"
        value="classpath:SqlMapConfig.xml"/>-->
    </bean>

    <!--映射接口扫描配置,由spring创建代理对象,交给IOC容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.soulboy.dao"/>
    </bean>
</beans>
  1. 修改AccountServiceImpl
package com.soulboy.service.impl;

import com.soulboy.dao.AccountDao;
import com.soulboy.domain.Account;
import com.soulboy.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;

    @Override
    public List<Account> findAll() {
       //System.out.println("findAll执行了……");
        List<Account> list = accountDao.findAll();
        return list;
    }
}
  1. 测试
package com.soulboy.test.spring;

import com.soulboy.domain.Account;
import com.soulboy.service.AccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest {
    @Autowired
    private AccountService accountService;

    @Test
    public void testSpring() {
        List<Account> accountList = accountService.findAll();
        for (Account account : accountList) {
            System.out.println(account);
        }
    }
}

编写springMVC在ssm环境中可以单独使用

需求:访问到controller里面的方法查询所有账户,并跳转到list.jsp页面进行列表展示

  1. 相关坐标
<!--springMVC坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <!--servlet坐标-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--jsp坐标-->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
  1. 导入页面资源


源码下载

  1. 前端控制器DispathcerServlet

src/main/webapp/WEB-INF/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">
    <!--前端控制器-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servletclass>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--post中文处理-->
    <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>/*</url-pattern>
    </filter-mapping>

</web-app>
  1. AccountController

AccountController

package com.soulboy.controller;

import com.soulboy.domain.Account;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model) {
        List<Account> list = new ArrayList<>();
        list.add(new Account(1,"张三",1000d));
        list.add(new Account(2,"李四",1000d));
        model.addAttribute("list", list);
        return "list";
    }
}

jsp页面
src/main/webapp/list.jsp

<c:forEach items="${list}" var="account">

              <tr>
                  <td>
                      <input type="checkbox" name="ids" value="${account.id}">
                  </td>
                  <td>${account.id}</td>
                  <td>${account.name}</td>
                  <td>${account.money}</td>
                  <td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/account/findById?id=${account.id}">修改</a>&nbsp;<a class="btn btn-default btn-sm" href="">删除</a></td>
              </tr>
              </c:forEach>
  1. springMVC核心配置文件

src/main/resources/spring-mvc.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
    <!--组件扫描-->
    <context:component-scan base-package="com.soulboy.controller"/>
    <!--mvc注解增强-->
    <mvc:annotation-driven/>
    <!--视图解析器-->
    <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--实现静态资源映射-->
    <mvc:default-servlet-handler/>
</beans>
  1. 配置Tomcat并启动并测试
    http://localhost:8080/ssm/account/findAll

spring整合springMVC

整合思想

 spring和springMVC其实根本就不用整合,本来就是一家。
 但是spring和web容器需要整合,让web容器启动的时候自动加载spring配置文件,web容器销毁的时候spring的ioc容器也销毁。

spring和web容器整合

ContextLoaderListener加载【掌握】
 可以使用spring-web包中的ContextLoaderListener监听器,可以监听servletContext容器的创建和销毁,来同时创建或销毁IOC容器。

src/main/webapp/WEB-INF/web.xml

<!--spring 与 web容器整合-->
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

修改AccountController(注入service:controller调用service,service调用dao)
AccountController

package com.soulboy.controller;

import com.soulboy.domain.Account;
import com.soulboy.service.AccountService;
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 java.util.List;

@Controller
@RequestMapping("/account")
public class AccountController {
    @Autowired
    private AccountService accountService;

    @RequestMapping("/findAll")
    public String findAll(Model model) {
        List<Account> list = accountService.findAll();
        model.addAttribute("list", list);
        return "list";
    }
}

配置Tomcat并启动并测试
http://localhost:8080/ssm/account/findAll

spring配置声明式事务(XML或注解)

  1. spring配置文件加入声明式事务
    applicationContext.xml
<!--事务管理器-->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--开启事务注解支持-->
    <tx:annotation-driven/>
  1. service层添加@Transactional 注解

AccountServiceImpl

package com.soulboy.service.impl;

import com.soulboy.dao.AccountDao;
import com.soulboy.domain.Account;
import com.soulboy.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;

    @Override
    public List<Account> findAll() {
       //System.out.println("findAll执行了……");
        List<Account> list = accountDao.findAll();
        return list;
    }
}
  1. add.jsp

src/main/webapp/add.jsp

<form action="${pageContext.request.contextPath}/account/save" method="post">
                <div class="form-group">
                    <label for="name">姓名:</label>
                    <input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名">
                </div>
                      <div class="form-group">
                    <label for="money">余额:</label>
                    <input type="text" class="form-control" id="money" name="money" placeholder="请输入余额">
                </div>

                <div class="form-group" style="text-align: center">
                    <input class="btn btn-primary" type="submit" value="提交" />
                    <input class="btn btn-default" type="reset" value="重置" />
                    <input class="btn btn-default" type="button" onclick="history.go(-1)" value="返回" />
                </div>
            </form>
  1. AccountController
@RequestMapping("/save")
    public String save(Account account){
        accountService.save(account);
        return "redirect:/account/findAll";
    }
  1. AccountService接口和实现类

接口

package com.soulboy.service;

import com.soulboy.domain.Account;

import java.util.List;

public interface AccountService {
    public List<Account> findAll();
    public void save(Account account);
}

实现类

package com.soulboy.service.impl;

import com.soulboy.dao.AccountDao;
import com.soulboy.domain.Account;
import com.soulboy.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;

    @Override
    public List<Account> findAll() {
       //System.out.println("findAll执行了……");
        List<Account> list = accountDao.findAll();
        return list;
    }

    @Override
    public void save(Account account) {
        accountDao.save(account);
    }
}
  1. AccountDao
package com.soulboy.dao;

import com.soulboy.domain.Account;

import java.util.List;

public interface AccountDao {
    /*
        查询所有
     */
    public List<Account> findAll();
    
    /*
        增加用户
     */
    void save(Account account);

}
  1. AccountDao.xml映射

AccountDao.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.soulboy.dao.AccountDao">
    <select id="findAll" resultType="Account">
        select * from account
    </select>

    <insert id="save" parameterType="Account">
        insert into account (name, money) values (#{name}, #{money})
    </insert>
</mapper>
  1. 测试:添加用户

http://localhost:8080/ssm/account/findAll


作者:Soulboy