SSM框架整合

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>xm</groupId>
    <artifactId>ssm</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!-- spring所需的包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>


        <!-- mybatis所需的包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.1</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.7</version>
        </dependency>

        <!-- mybatis和spring整合的包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.1</version>
        </dependency>

        <!-- mysql驱动包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>

        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.4</version>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.5.0-RC2</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <!-- 逆向工程maven插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.47</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

</project>

创建mybatis逆向工程

generatorConfig.xml

会自动创建mapper.xml文件和实体类

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!-- 数据库驱动配置 -->

    <context id="mysqlTable" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释-->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--数据库配置-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/sm?useSSL=false"
                        userId="root"
                        password="zm19980225">
        </jdbcConnection>

        <!-- 数据库类型与java类型转换
        当属性为false或未指定时，默认Java类型解析器将尝试通过替换Integral类型（如果可能）来使JDBC DECIMAL和NUMERIC类型更易于使用。
        替代规则如下：
        如果比例大于零，或者长度大于18，则将使用java.math.BigDecimal类型
        如果比例为零，并且长度为10到18，那么Java类型解析器将替换java.lang.Long。
        如果比例为零，并且长度为5到9，那么Java类型解析器将替换java.lang.Integer。
        如果比例为零，并且长度小于5，那么Java类型解析器将替换java.lang.Short。-->
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- 生成Model类存放位置 -->
        <javaModelGenerator targetPackage="com.xm.pojo" targetProject="src/main/java">
            <!-- 是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="true" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="false" />
        </javaModelGenerator>

        <!-- 生成映射文件存放位置 -->
        <sqlMapGenerator targetPackage="com.xm.mapper"  targetProject="src/main/java">
            <!-- 是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>

<!--        &lt;!&ndash; 生成Dao类存放位置 &ndash;&gt;-->
<!--        <javaClientGenerator type="XMLMAPPER" targetPackage="com.xm.dao"  targetProject="src/main/java">-->
<!--            <property name="enableSubPackages" value="true" />-->
<!--        </javaClientGenerator>-->

        <!-- 生成对应表及类名 -->
        <!-- 指定是否需要生成xxxbyExample的mapper -->
        <table tableName="users" domainObjectName="User"
               enableCountByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               enableUpdateByExample="false"
               ></table>

    </context>
</generatorConfiguration>

运行后会生成mapper文件，但是在项目运行时该文件不会被打包，需要配置maven让maven将其打包

<!-- 在build中 -->
<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>true</filtering>
    </resource>
</resources>

开发持久层（Dao层接口及实现）

package com.xm.dao;

import com.xm.pojo.User;

public interface UserDao {
    void addUser(User user);
    void delUser(Long uid);
    void updateUser(User user);
    User findById(Long uid);
}

package com.xm.dao;

import com.xm.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {
    @Override
    public void addUser(User user) {
        this.getSqlSession().insert("com.xm.mapper.UserMapper.insertSelective",user);
    }

    @Override
    public void delUser(Long uid) {
        this.getSqlSession().delete("com.xm.mapper.UserMapper.deleteByPrimaryKey",uid);
    }

    @Override
    public void updateUser(User user) {
        this.getSqlSession().update("com.xm.mapper.UserMapper.updateByPrimaryKeySelective");
    }

    @Override
    public User findById(Long uid) {
        User user = this.getSqlSession().selectOne("com.xm.mapper.UserMapper.selectByPrimaryKey",uid);
        return user;
    }

开发服务层（接口及实现）

DTO用于对dao层进行拓展，例如增加关联属性等

package com.xm.dto;

import java.util.Arrays;
import java.util.Date;

/**
 * 对实体类的拓展，用于有关联关系等
 */
public class UserDTO {
    private Integer id;

    private String username;

    private String sex;

    private Date birthday;

    private String address;

    private Long[] uids;

    public UserDTO() {
    }

    public UserDTO(Integer id, String username, String sex, Date birthday, String address, Long[] uids) {
        this.id = id;
        this.username = username;
        this.sex = sex;
        this.birthday = birthday;
        this.address = address;
        this.uids = uids;
    }

    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;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Long[] getUids() {
        return uids;
    }

    public void setUids(Long[] uids) {
        this.uids = uids;
    }

    @Override
    public String toString() {
        return "UserDTO{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", sex='" + sex + '\'' +
                ", birthday=" + birthday +
                ", address='" + address + '\'' +
                ", uids=" + Arrays.toString(uids) +
                '}';
    }
}

package com.xm.service;

import com.xm.dto.UserDTO;

public interface UserService{

    public void addUser(UserDTO dto);

    public void deluser(Long uid);

    public void updateUser(UserDTO dto);

    public UserDTO findById(Long uid);
}

package com.xm.service;

import com.xm.dao.UserDao;
import com.xm.dto.UserDTO;
import com.xm.pojo.User;
import org.springframework.beans.BeanUtils;

public class UserServiceImpl implements UserService {

    //依赖持久层：注入
    private UserDao userDao;

    public void setUserDao(UserDTO userDTO) {
        this.userDao = userDao;
    }

    @Override
    public void addUser(UserDTO dto) {
        User user = new User();
        //方式一
//        user.setUsername(dto.getUsername());
//        user.setId(dto.getId());
//        user.setAddress(dto.getAddress());
//        user.setBirthday(dto.getBirthday());
//        user.setSex(dto.getSex());

        //方式二
        BeanUtils.copyProperties(dto,user);//对象之间复制（要求属性，类名名称需要一致）
        userDao.addUser(user);

    }

    @Override
    public void deluser(Long uid){
        userDao.delUser(uid);
    }

    @Override
    public void updateUser(UserDTO dto) {
        User user = new User();
        BeanUtils.copyProperties(dto,user);//对象之间复制（要求属性，类名名称需要一致）
        userDao.addUser(user);
    }

    @Override
    public UserDTO findById(Long uid) {
        User user = userDao.findById(uid);
        UserDTO dto = new UserDTO();
        BeanUtils.copyProperties(user,dto);
        return dto;
    }
}

开发表现层

package com.xm.action;

import com.xm.dto.UserDTO;
import com.xm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@Controller
public class UserAction {

    //依赖服务层，自动注入
    @Autowired
    private UserService userService;

    @RequestMapping("/addUser.do")
    public String addUser(UserDTO dto){
        userService.addUser(dto);
        return "forward:/listUser.do";
    }

    @RequestMapping("/delUser.do")
    public String delUser(Long uid){
        userService.deluser(uid);
        return "/listUser.do";
    }

    @RequestMapping("/updateUser.do")
    public String updateUser(UserDTO dto){
        userService.updateUser(dto);
        return "/listUser.do";
    }

    @RequestMapping("/listUser.do")
    public ModelAndView listUser(HttpServletRequest request){
        ModelAndView mv = new ModelAndView();
        String uid = request.getParameter("uid");
        if(!StringUtils.isEmpty(uid)){
            UserDTO byId = userService.findById(Long.parseLong(uid));
            mv.addObject("dto",byId);
        }

        mv.setViewName("/userlist");
        return mv;
    }
}

整合持久层，表现层配置（applicationContext.xml+web.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"
       xmlns:aop="http://www.springframework.org/schema/aop" 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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 加载配置文件 -->
    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 连接池 -->
    <bean name="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}"/>
    </bean>

    <!-- mybatis的工厂 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- 指定读取mapper映射文件位置 -->
        <property name="mapperLocations" value="classpath:com/xm/mapper/*.xml"/>
        <!-- 注入mybatis配置文件 -->
<!--        <property name="configLocation" value="classpath:spring-mybatis.xml"></property>-->
    </bean>

    <!-- 注入sqlSessionFactory -->
    <bean id="userDao" class="com.xm.dao.UserDaoImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"></property>
    </bean>

    <!-- 注入服务层对象，注入DAO目标类对象 -->
    <bean id="userService" class="com.xm.service.UserServiceImpl">
        <property name="userDao" ref="userDao"/>
    </bean>

    <!-- 事务管理通知类对象 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据源 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 定义事务通知切面,让事务应用到具体的方法 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 可以对方法名使用通配符 -->
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="add*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="create*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="del*" propagation="REQUIRED"/>
            <tx:method name="find*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!-- Aop编程：让切入点与通知关联形成切面 -->
    <aop:config>
        <aop:pointcut id="myPoint" expression="execution(* com.xm.service.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="myPoint"></aop:advisor>
    </aop:config>

    <!-- 整合表现层配置 -->

    <!-- 注解的处理器映射器和适配器 -->
    <mvc:annotation-driven/>

    <!-- 视图解析器：逻辑视图 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/"></property>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 扫描action -->
    <context:component-scan base-package="com.xm.action"></context:component-scan>
</beans>

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">

    <!-- 配置过滤器 -->
    <filter>
        <filter-name>myfilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

        <!-- 指定编码 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
        <!-- 启动强编码 -->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>myfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>springmvc</servlet-name>
        <!-- 关联中央处理器 -->
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 读取springmvc的配置文件 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-applicationContext.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

</web-app>

项目目录结构