demo_1

我练习的demo是基于SSM+MySQL+Eclipse+Tomcat8+Maven3实现的；

创建项目

##　　创建Maven Project：

　　Artifact Id: cn.com.demo
       Group Id: demo

##　　完成项目的基本配置

##　　生成web.xml

##　　添加Tomcat Runtime

##　　添加pom.xml

<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>cn.xx</groupId>
  <artifactId>demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
        <!-- spring 的依赖jar包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>

        <!-- spring-jdbc的依赖jar包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>

        <!-- junit测试jar包 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <!-- 数据库的连接池 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <!-- mysql数据库 -->
        <dependency>
            <groupId>MySQL</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>

        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.5</version>
        </dependency>

        <!-- mybatis-spring整合 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!-- jstl -->
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

    </dependencies>
</project>

##　　配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
    <display-name>demo</display-name>
    
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <!-- Servlet控制器 -->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-*.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>filter</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>filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

##　　Spring的配置文件

spring-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:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
        
        <!-- 组件扫描 -->
        <context:component-scan base-package="控制器路径"/>
        
        <!-- 配置视图解析器 InternalResourceViewResolver  -->
        <bean id="ViewResource" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/web/"/>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"/>
        
        <!--    1、基于注解的映射器默认是：DefaultAnnotationHandlerMapping，映射处理器是2.5版本的；
                 2、3.2版本定义一个新的映射处理器：RequestMappingHandlerMapping
                 3、如果要改变默认的映射处理器，处理下面的配置
                 4、默认初始化一些工具类：比如异常处理，解析json-->
        <mvc:annotation-driven />
        </bean>
        
        
        
        
        
        
        
        </beans>

spring-dao.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:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
        
        <!--1、util:properties表示读取外部的属性文件，并实例化对象
            2、id表示名称
            3、localhost表示属性文件的位置 -->
    <util:properties id="jdbc"
        location="classpath:db.properties" />
            
        <!-- 配置数据库的连接池
            1、使用spring表达式给属性赋值
            2、spring表达式语法格式：#{} -->
    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName"
            value="#{jdbc.driverClassName}" />
        <property name="url" value="#{jdbc.url}" />
        <property name="username" value="#{jdbc.username}" />
        <property name="password" value="#{jdbc.password}" />
    </bean>

    <!-- 持久层接口的扫描 -->
    <bean id="scannerConfigurer"
        class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="持久层路径" />
    </bean>

    <!-- SqlSessionFactoryBean的初始化 -->
    <bean id="factoryBean"
        class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 依赖注入数据源(dataSource) -->
        <property name="dataSource" ref="dataSource" />
        <!-- 读取编写sql语句的映射文件 -->
        <property name="mapperLocations"
            value="classpath:mappers/*.xml" />
    </bean>
        
</beans>

spring-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:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
        
        <!-- 扫描包 可以扫描到当前包和子包下的所有类 -->
    <context:component-scan
        base-package="cn.com.service" />
        
        
</beans>

##　　数据库的配置文件

db.properties

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mysql
username=root
password=123

##　　MyBatis的映射模版

创建mappers文件夹，并添加sql映射文件

持久层

检查配置
检查`db.properties`中的数据库名称
检查`spring-dao.xml`中配置的接口文件的包名

创建User类
创建`com.demo.pojo.User`类，属性可参考数据表。

私有化所有属性，提供所有属性的SET/GET方法，添加无参数和全参数的构造方法，自动生成`toString()`方法（便于测试数据），`equals()`和`hashCode()`可后续再添加，实现`Serializable`接口，并生成序列化ID。

package com.demo.pojo;

import java.io.Serializable;
import java.util.Date;

public class User implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = -4390901662089334130L;
    private Integer id;
    private String username;
    private String password;
    private Integer gender;
    private String phone;
    private String email;
    private String uuid;
    private String createdUser;
    private Date createdTime;
    private String modifiedUser;
    private Date modifiedTime;

    public User() {
        super();
        // TODO Auto-generated constructor stub
    }

    public User(Integer id, String username, String password, Integer gender, String phone, String email, String uuid,
            String createdUser, Date createdTime, String modifiedUser, Date modifiedTime) {
        super();
        this.id = id;
        this.username = username;
        this.password = password;
        this.gender = gender;
        this.phone = phone;
        this.email = email;
        this.uuid = uuid;
        this.createdUser = createdUser;
        this.createdTime = createdTime;
        this.modifiedUser = modifiedUser;
        this.modifiedTime = modifiedTime;
    }

    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 getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getUuid() {
        return uuid;
    }

    public void setUuid(String uuid) {
        this.uuid = uuid;
    }

    public String getCreatedUser() {
        return createdUser;
    }

    public void setCreatedUser(String createdUser) {
        this.createdUser = createdUser;
    }

    public Date getCreatedTime() {
        return createdTime;
    }

    public void setCreatedTime(Date createdTime) {
        this.createdTime = createdTime;
    }

    public String getModifiedUser() {
        return modifiedUser;
    }

    public void setModifiedUser(String modifiedUser) {
        this.modifiedUser = modifiedUser;
    }

    public Date getModifiedTime() {
        return modifiedTime;
    }

    public void setModifiedTime(Date modifiedTime) {
        this.modifiedTime = modifiedTime;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", username=" + username + ", password=" + password + ", gender=" + gender
                + ", phone=" + phone + ", email=" + email + ", uuid=" + uuid + ", createdUser=" + createdUser
                + ", createdTime=" + createdTime + ", modifiedUser=" + modifiedUser + ", modifiedTime=" + modifiedTime
                + "]";
    }

}

创建包和接口

创建`com.demo.dao.UserMapper`接口，并添加抽象方法：

package com.demo.dao;

import com.demo.pojo.User;

public interface UserMapper {
    /**
     * 添加用户信息
     * @param user 用户信息
     * @return 返回有效行数
     */
    Integer insert(User user);
}

##　　配置XML映射

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" 
    "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<!-- namespace:匹配的接口 -->
<mapper namespace="com.demo.dao.UserMapper">

    <!-- 添加用户信息 -->
    <!-- Integer insert(User user) -->

    <insert id="insert" parameterType="com.demo.pojo.User"
        useGeneratedKeys="true" keyProperty="id">
    INSERT INTO 
        t_user (
        username,
        password,
        gender,
        phone,
        email,
        uuid,
        created_user,
        created_time,
        modified_user,
        modified_time
    ) VALUES (
        #{username},
        #{password},
        #{gender},
        #{phone},
        #{email},
        #{uuid},
        #{createdUser},
        #{createdTime},
        #{modifiedUser},
        #{modifiedTime}
    )
    </insert>
</mapper>