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>