Spring+SpringMVC+Mybatis实现简单的注册登录功能

男娘i 2022-05-25 04:28 190阅读 0赞

由于最开始过于自信，想着一天的时间就能在一个干净的环境内（一个能上网的Windows10即可），从零开始利用Spring+SpringMVC+Mybatis（SSM）实现下简单的注册登录功能，由此基础实现更为复杂的功能。结果由于老眼昏花，中间还是踩了一些坑。其中某个笔误（少敲了一个字母）竟让我在网络上游荡了2天寻医问药还是徒劳而返，最后老老实实重新检查了所有配置文件才发现这个笔误。

提示：为了增加成功率，建议先严格按照我下面的步骤做出来一个成功的演示结果后，再按照自己的喜好修改。  
  
闲话少絮，言归正传。  
  
一、在敲代码之前，下载并安装了下面的软件：  
  
1，JDK 1.8.0 Windows x64 点击打开下载链接（推荐下载最新小版本）  
2，Apache Maven 3.5.2  [点击打开下载链接  
][Link 1]3，Apache Tomcat 7.0.86 64-bit Windows zip [点击打开下载链接  
][Link 2]4，MySQL 5.7 Installer [点击打开下载链接][Link 3] （推荐下载最新小版本）  
5，Eclipse IDE for Java EE Oxygen Windows 64 bit  [点击打开下载链接][Link 4]  （这里是清华大学镜像，你可以选择其他镜像下载）  
  
二、安装完以上软件，进行了下面的配置：  
  
1，环境变量

<table> 
 <tbody> 
  <tr> 
   <td>变量名</td> 
   <td>变量值</td> 
  </tr> 
  <tr> 
   <td>CATALINA_HOME</td> 
   <td>D:\Programs\apache-tomcat-7.0.86</td> 
  </tr> 
  <tr> 
   <td>JAVA_HOME</td> 
   <td>D:\Programs\Java\jdk1.8.0_71</td> 
  </tr> 
  <tr> 
   <td>CLASSPATH</td> 
   <td>.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar</td> 
  </tr> 
  <tr> 
   <td>M2_HOME</td> 
   <td>D:\Programs\apache-maven-3.5.2</td> 
  </tr> 
  <tr> 
   <td>Path</td> 
   <td>手动添加：%JAVA_HOME%\bin;%M2_HOME%\bin;%CATALINA_HOME%\bin</td> 
  </tr> 
 </tbody> 
</table>

2，Maven

1) 创建.m2文件夹  
运行mvn help:system下载一些必要的依赖包和创建.m2文件夹（ 在 C:\\Users\\<登录用户>文件夹下面）。  
2) 创建settings.xml配置文件  
将Maven安装目录里的conf目录下的settings.xml配置文件拷贝到.m2目录里。  
3) 修改 settings.xml配置文件的mirrors  
在settings.xml配置文件的mirrors节点增加Aliyun镜像加快依赖包的下载速度：

<mirror>  
      <id>nexus</id>  
      <mirrorOf>\*</mirrorOf>  
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>  
  </mirror>  
  
3，Eclipse  
1) 创建Workspace目录  
创建目录D:\\development\\workspace\_eclipse-jee-oxygen-2-win32-x86\_64，在Eclipse第一次启动时候选择这个目录。  
2) 关联JDK

Eclipse菜单Windows>Preferences，展开Java，选中Installed JREs，Add "Standard VM"，选中JDK1.8.0\_71的安装目录，返回后勾选为默认JRE环境。

3) 关联Tomcat  
Eclipse菜单Windows>Preferences，展开Server，选中Runtime Environments，Add "Apache Tomcat v7.0"，选中Tomcat 7.0.86的安装目录，返回后即可看到配好的运行时环境。  
  
4，MySQL

1) 配置好root用户的密码，使用Service方式自动启动MySQL服务。  
2) 使用MySQL Workbench创建链接用root用户登录到Hostname:localhost和Port:3306。

3) 运行下面SQL语句创建数据库、用户表，并且插入一些测试数据：

CREATE TABLE tbl\_user  
(  
id int NOT NULL AUTO\_INCREMENT,  
user\_name varchar(32) NOT NULL,  
user\_alias varchar(32),  
passwd varchar(32) NOT NULL,  
email varchar(32),  
user\_role varchar(32),  
PRIMARY KEY (id)  
);

INSERT INTO tbl\_user(user\_name, user\_alias, passwd, email, user\_role)  
VALUES('admin', 'admin', 'admin', 'admin@pitt.com', 'sysadmin');

INSERT INTO tbl\_user(user\_name, user\_alias, passwd, email, user\_role)  
VALUES('user01', 'user01', 'user01', 'user01@pitt.com', 'guest');

三、等了这么久，终于可以创建Web工程敲SSM代码了：

1，创建Maven Web工程

Ecliplse菜单File>New>Maven Project>Next>选择Artifact Id为maven-archetype-webapp的Archetype，Next（等待一段下载时间，如果这里报错，一般是网络问题或者settings.xml配置问题，修正好重做一遍即可）>Group Id: com.pitt，Artifact Id: ssm-demo，Package: com.pitt.ssm.demo，Finish。  
2，添加以下Source Folder

src/main/java  
src/main/resources

3，修改pom.xml，引入相应的依赖包：

<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/maven-v4_0_0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<groupId>com.pitt</groupId>
    	<artifactId>ssm-demo</artifactId>
    	<packaging>war</packaging>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>ssm-demo Maven Webapp</name>
    	<url>http://maven.apache.org</url>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<spring.version>4.3.3.RELEASE</spring.version>
    		<junit.version>4.12</junit.version>
    		<aspectj.version>1.8.9</aspectj.version>
    		<jackson.json.version>2.7.4</jackson.json.version>
    		<fasterxml.jackson.version>2.7.4</fasterxml.jackson.version>
    		<codehaus.woodstox.version>4.4.1</codehaus.woodstox.version>
    	</properties>
    
    	<dependencies>
    
    		
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>${junit.version}</version>
    			<scope>test</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>javax.servlet-api</artifactId>
    			<version>3.1.0</version>
    			<scope>provided</scope>
    		</dependency>
    		<dependency>
    			<groupId>jstl</groupId>
    			<artifactId>jstl</artifactId>
    			<version>1.2</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>javax.servlet.jsp</groupId>
    			<artifactId>javax.servlet.jsp-api</artifactId>
    			<version>2.3.1</version>
    			<scope>provided</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>5.1.38</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-core</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-aop</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-context</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-web</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-webmvc</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-oxm</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-test</artifactId>
    			<version>${spring.version}</version>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-jdbc</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>com.fasterxml.jackson.core</groupId>
    			<artifactId>jackson-core</artifactId>
    			<version>${jackson.json.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>com.fasterxml.jackson.core</groupId>
    			<artifactId>jackson-databind</artifactId>
    			<version>${jackson.json.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>com.fasterxml.jackson.core</groupId>
    			<artifactId>jackson-annotations</artifactId>
    			<version>${jackson.json.version}</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>com.fasterxml.jackson.dataformat</groupId>
    			<artifactId>jackson-dataformat-xml</artifactId>
    			<version>${fasterxml.jackson.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.codehaus.woodstox</groupId>
    			<artifactId>woodstox-core-asl</artifactId>
    			<version>${codehaus.woodstox.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.hibernate</groupId>
    			<artifactId>hibernate-validator</artifactId>
    			<version>5.2.4.Final</version>
    		</dependency>
    
    		<dependency>
    			<groupId>commons-fileupload</groupId>
    			<artifactId>commons-fileupload</artifactId>
    			<version>1.3.2</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.aspectj</groupId>
    			<artifactId>aspectjweaver</artifactId>
    			<version>${aspectj.version}</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>com.mchange</groupId>
    			<artifactId>c3p0</artifactId>
    			<version>0.9.5.2</version>
    		</dependency>
    		<dependency>
    			<groupId>org.mybatis</groupId>
    			<artifactId>mybatis</artifactId>
    			<version>3.4.1</version>
    		</dependency>
    		<dependency>
    			<groupId>org.mybatis</groupId>
    			<artifactId>mybatis-spring</artifactId>
    			<version>1.3.0</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.slf4j</groupId>
    			<artifactId>slf4j-api</artifactId>
    			<version>1.7.21</version>
    		</dependency>
    		<dependency>
    			<groupId>ch.qos.logback</groupId>
    			<artifactId>logback-core</artifactId>
    			<version>1.1.7</version>
    		</dependency>
    		<dependency>
    			<groupId>ch.qos.logback</groupId>
    			<artifactId>logback-classic</artifactId>
    			<version>1.1.7</version>
    		</dependency>
    		<dependency>
    			<groupId>ch.qos.logback</groupId>
    			<artifactId>logback-access</artifactId>
    			<version>1.1.7</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>commons-dbutils</groupId>
    			<artifactId>commons-dbutils</artifactId>
    			<version>1.6</version>
    		</dependency>
    
    	</dependencies>
    
    	<build>
    		<finalName>ssm-demo</finalName>
    
    		
    		<resources>
    			<resource>
    				<directory>src/main/resources</directory>
    				<includes>
    					<include>**/*.properties</include>
    					<include>**/*.xml</include>
    					<include>**/*.tld</include>
    				</includes>
    				<filtering>false</filtering>
    			</resource>
    			<resource>
    				<directory>src/main/java</directory>
    				<includes>
    					<include>**/*.properties</include>
    					<include>**/*.xml</include>
    					<include>**/*.tld</include>
    				</includes>
    				<filtering>false</filtering>
    			</resource>
    		</resources>
    
    		<plugins>
    			
    			<plugin>
    				<groupId>org.mybatis.generator</groupId>
    				<artifactId>mybatis-generator-maven-plugin</artifactId>
    				<version>1.3.5</version>
    				<configuration>
    					<configurationFile>src/main/resources/generator.xml</configurationFile>
    					<verbose>true</verbose>
    					<overwrite>true</overwrite>
    				</configuration>
    				<dependencies>
    					<dependency>
    						<groupId>org.mybatis.generator</groupId>
    						<artifactId>mybatis-generator-core</artifactId>
    						<version>1.3.5</version>
    					</dependency>
    				</dependencies>
    			</plugin>
    		</plugins>
    	</build>
    </project>

4，修改SSM相关配置文件src/main/webapp/web.xml：

<?xml version="1.0" encoding="utf-8"?>
    <web-app xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    	
    
    	<display-name>SSM Demo</display-name>
    
    	
    	
    	<listener>
    		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    	</listener>
    	
    	<context-param>
    		<param-name>contextConfigLocation</param-name>
    		<param-value>classpath*:spring.xml</param-value>
    	</context-param>
    
    	
    	<servlet>
    		<servlet-name>springmvc</servlet-name>
    		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    		<init-param>
    			<param-name>contextConfigLocation</param-name>
    			<param-value>classpath:springmvc.xml</param-value>
    		</init-param>
    		<load-on-startup>1</load-on-startup>
    	</servlet>
    	
    	<servlet-mapping>
    		<servlet-name>springmvc</servlet-name>
    		<url-pattern>*.action</url-pattern>
    	</servlet-mapping>
    
    	
    	<filter>
    		<filter-name>encodingFilter</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>
    		<init-param>
    			<param-name>forceEncoding</param-name>
    			<param-value>true</param-value>
    		</init-param>
    	</filter>
    	<filter-mapping>
    		<filter-name>encodingFilter</filter-name>
    		<url-pattern>/*</url-pattern>
    	</filter-mapping>
    
    	
    	<welcome-file-list>
    		<welcome-file>index.html</welcome-file>
    		<welcome-file>index.htm</welcome-file>
    		<welcome-file>index.jsp</welcome-file>
    		<welcome-file>default.html</welcome-file>
    		<welcome-file>default.htm</welcome-file>
    		<welcome-file>default.jsp</welcome-file>
    	</welcome-file-list>
    </web-app>

5，创建 SSM相关配置文件src/main/resources/spring.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">
    	
    	
    	<context:component-scan base-package="com.pitt.ssm.demo.service" />
    	
    	
    	
    	
    	
    	<context:property-placeholder location="classpath:jdbc.properties"/>	
    	
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="driverClass" value="${jdbc_driverClassName}" />
    		<property name="jdbcUrl" value="${jdbc_url}" />
    		<property name="user" value="${jdbc_username}" />
    		<property name="password" value="${jdbc_password}" />
    	</bean>
    	
    	
    	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    		<property name="dataSource" ref="dataSource"></property>
    		<property name="mapperLocations" value="classpath*:com/pitt/ssm/demo/mapper/**/*.xml" />
    		<property name="configLocation" value="classpath:mybatis-config.xml" />
    	</bean>
    	
    	
    	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    		<property name="basePackage" value="com.pitt.ssm.demo.dao"></property>
    	</bean>
    	
    	
    	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    	
    	
    	<tx:annotation-driven transaction-manager="transactionManager"/>
    </beans>

6，创建SSM相关配置文件src/main/resources/jdbc.properties：

jdbc_driverClassName=com.mysql.jdbc.Driver
    jdbc_url=jdbc:mysql://localhost:3306/db_ssm_demo?useUnicode=true&characterEncoding=utf-8
    jdbc_username=root
    jdbc_password=root

7，创建SSM相关配置文件src/main/resources/mybatis-config.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>
    	<typeAliases>
    		<typeAlias alias="User" type="com.pitt.ssm.demo.model.User" />
    	</typeAliases>
    </configuration>

8，创建SSM相关配置文件src/main/resources/springmvc.xml：

9，创建利用MyBatis Generator自动创建实体类、映射文件以及DAO接口的相关配置文件src/main/resources/generator.xml：

<?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>
    	
    	
    	<classPathEntry
    		location="C:\Users\op051413\.m2\repository\mysql\mysql-connector-java\5.1.38\mysql-connector-java-5.1.38.jar" />
    	<context id="DB2Tables" targetRuntime="MyBatis3">
    		<commentGenerator>
    			<property name="suppressAllComments" value="true" />
    		</commentGenerator>
    		
    		<jdbcConnection driverClass="com.mysql.jdbc.Driver"
    			connectionURL="jdbc:mysql://127.0.0.1:3306/db_ssm_demo" userId="root"
    			password="root">
    		</jdbcConnection>
    		<javaTypeResolver>
    			<property name="forceBigDecimals" value="false" />
    		</javaTypeResolver>
    		
    		<javaModelGenerator targetPackage="com.pitt.ssm.demo.model"
    			targetProject="D:\development\workspace_eclipse-jee-oxygen-2-win32-x86_64\ssm-demo\src\main\java">
    			<property name="enableSubPackages" value="true" />
    			<property name="trimStrings" value="true" />
    		</javaModelGenerator>
    		
    		<sqlMapGenerator targetPackage="com.pitt.ssm.demo.mapper"
    			targetProject="D:\development\workspace_eclipse-jee-oxygen-2-win32-x86_64\ssm-demo\src\main\java">
    			<property name="enableSubPackages" value="true" />
    		</sqlMapGenerator>
    		
    		<javaClientGenerator type="XMLMAPPER"
    			targetPackage="com.pitt.ssm.demo.dao"
    			targetProject="D:\development\workspace_eclipse-jee-oxygen-2-win32-x86_64\ssm-demo\src\main\java">
    			<property name="enableSubPackages" value="true" />
    		</javaClientGenerator>
    		
    		<table tableName="tbl_user" domainObjectName="User"
    			enableCountByExample="false" enableUpdateByExample="false"
    			enableDeleteByExample="false" enableSelectByExample="false"
    			selectByExampleQueryId="false" />
    	</context>
    </generatorConfiguration>

10，在Eclipse菜单Run>Run Configurations>选中Maven Build，新建：

Name:mybatis-generator\_generate

Base directory:$\{workspace\_loc:/ssm-demo\}

Goals:mybatis-generator:generate

点击Apply以及Run，开始自动生成相关代码。

11，检查src/main/java/com.pitt.ssm.demo.model.User.java：

package com.pitt.ssm.demo.model;
    
    public class User {
        private Integer id;
    
        private String userName;
    
        private String userAlias;
    
        private String passwd;
    
        private String email;
    
        private String userRole;
    
        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 == null ? null : userName.trim();
        }
    
        public String getUserAlias() {
            return userAlias;
        }
    
        public void setUserAlias(String userAlias) {
            this.userAlias = userAlias == null ? null : userAlias.trim();
        }
    
        public String getPasswd() {
            return passwd;
        }
    
        public void setPasswd(String passwd) {
            this.passwd = passwd == null ? null : passwd.trim();
        }
    
        public String getEmail() {
            return email;
        }
    
        public void setEmail(String email) {
            this.email = email == null ? null : email.trim();
        }
    
        public String getUserRole() {
            return userRole;
        }
    
        public void setUserRole(String userRole) {
            this.userRole = userRole == null ? null : userRole.trim();
        }
    }

12， 检查并修改src/main/java/com.pitt.ssm.demo.dao.UserMapper.java：

package com.pitt.ssm.demo.dao;
    
    import org.apache.ibatis.annotations.Param;
    
    import com.pitt.ssm.demo.model.User;
    
    public interface UserMapper {
        int deleteByPrimaryKey(Integer id);
    
        int insert(User record);
    
        int insertSelective(User record);
    
        User selectByPrimaryKey(Integer id);
    
        int updateByPrimaryKeySelective(User record);
    
        int updateByPrimaryKey(User record);
        
        User findUserByNameAndPwd(@Param("userName")String userName, @Param("passwd")String passwd);
        
        User findByUserName(String userName);
    }

13， 检查并修改src/main/java/com.pitt.ssm.demo.mapper.UserMapper.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.pitt.ssm.demo.dao.UserMapper">
    	<resultMap id="BaseResultMap" type="User">
    		<id column="id" jdbcType="INTEGER" property="id" />
    		<result column="user_name" jdbcType="VARCHAR" property="userName" />
    		<result column="user_alias" jdbcType="VARCHAR" property="userAlias" />
    		<result column="passwd" jdbcType="VARCHAR" property="passwd" />
    		<result column="email" jdbcType="VARCHAR" property="email" />
    		<result column="user_role" jdbcType="VARCHAR" property="userRole" />
    	</resultMap>
    	<sql id="Base_Column_List">
    		id, user_name, user_alias, passwd, email, user_role
    	</sql>
    	<select id="selectByPrimaryKey" parameterType="java.lang.Integer"
    		resultMap="BaseResultMap">
    		select
    		<include refid="Base_Column_List" />
    		from tbl_user
    		where id = #{id}
    	</select>
    	<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    		delete from tbl_user
    		where id = #{id}
    	</delete>
    	<insert id="insert" parameterType="User">
    		insert into tbl_user (id, user_name, user_alias, passwd,
    		email, user_role)
    		values (#{id}, #{userName}, #{userAlias}, #{passwd},
    		#{email}, #{userRole})
    	</insert>
    	<insert id="insertSelective" parameterType="User">
    		insert into tbl_user
    		<trim prefix="(" suffix=")" suffixOverrides=",">
    			<if test="id != null">
    				id,
    			</if>
    			<if test="userName != null">
    				user_name,
    			</if>
    			<if test="userAlias != null">
    				user_alias,
    			</if>
    			<if test="passwd != null">
    				passwd,
    			</if>
    			<if test="email != null">
    				email,
    			</if>
    			<if test="userRole != null">
    				user_role,
    			</if>
    		</trim>
    		<trim prefix="values (" suffix=")" suffixOverrides=",">
    			<if test="id != null">
    				#{id},
    			</if>
    			<if test="userName != null">
    				#{userName},
    			</if>
    			<if test="userAlias != null">
    				#{userAlias},
    			</if>
    			<if test="passwd != null">
    				#{passwd},
    			</if>
    			<if test="email != null">
    				#{email},
    			</if>
    			<if test="userRole != null">
    				#{userRole},
    			</if>
    		</trim>
    	</insert>
    	<update id="updateByPrimaryKeySelective" parameterType="User">
    		update tbl_user
    		<set>
    			<if test="userName != null">
    				user_name = #{userName},
    			</if>
    			<if test="userAlias != null">
    				user_alias = #{userAlias},
    			</if>
    			<if test="passwd != null">
    				passwd = #{passwd},
    			</if>
    			<if test="email != null">
    				email = #{email},
    			</if>
    			<if test="userRole != null">
    				user_role = #{userRole},
    			</if>
    		</set>
    		where id = #{id,jdbcType=INTEGER}
    	</update>
    	<update id="updateByPrimaryKey" parameterType="User">
    		update tbl_user
    		set user_name = #{userName},
    		user_alias = #{userAlias},
    		passwd = #{passwd},
    		email = #{email},
    		user_role = #{userRole}
    		where id = #{id}
    	</update>
    	<select id="findUserByNameAndPwd" resultType="User">
    		select * from tbl_user
    		where user_name=#{userName} and passwd=#{passwd}
    	</select>
        <select id="findByUserName" resultType="User">
            select * from tbl_user where user_name=#{userName}
        </select>
    </mapper>

14，新建 src/main/java/com.pitt.ssm.demo.service.UserService.java：

package com.pitt.ssm.demo.service;
    
    import com.pitt.ssm.demo.model.User;
    
    public interface UserService {
    	// 用户注册
    	void register(User user);
    	
    	// 用户登录
    	User login(String userName, String passwd);
    	 
    	// 根据用户名查询
    	User findByUserName(String userName);
    }

15， 新建 src/main/java/com.pitt.ssm.demo.service.impl.UserServiceImpl.java：

package com.pitt.ssm.demo.service.impl;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.pitt.ssm.demo.dao.UserMapper;
    import com.pitt.ssm.demo.model.User;
    import com.pitt.ssm.demo.service.UserService;
    
    @Service
    public class UserServiceImpl implements UserService {
    
    	@Autowired
    	private UserMapper userMapper;
    	
    	// @Override
    	public void register(User user) {
    		userMapper.insert(user);
    	}
    
    	// @Override
    	public User login(String userName, String passwd) {
    		User user = userMapper.findUserByNameAndPwd(userName, passwd);
    		if (user != null) {
                return user;
            }
            return null;
    	}
    	
    	// @Override
    	public User findByUserName(String userName) {
    		return userMapper.findByUserName(userName);
    	}
    }

16， 新建 src/main/java/com.pitt.ssm.demo.controller.UserController.java：

package com.pitt.ssm.demo.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Scope;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import com.pitt.ssm.demo.model.User;
    import com.pitt.ssm.demo.service.UserService;
    
    /**
     * 控制层
     * 
     * @author Pitt
     *
     */
    @Controller
    @Scope("prototype")
    @RequestMapping("/user")
    public class UserController {
    	// 注入Service
    	@Autowired
    	private UserService userService;
    
    	@RequestMapping(value = "/register.action", method = RequestMethod.POST)
    	public String register(User user, Model model) {
    		String username = user.getUserName();
    		// 如果数据库中没有该用户，可以注册，否则跳转页面
    		if (userService.findByUserName(username) == null) {
    			// 添加用户
    			userService.register(user);
    			model.addAttribute("msg", "注册成功");
    			// 注册成功跳转到主页面
    			return "register_success";
    		} else {
    			model.addAttribute("msg", "注册失败");
    			// 注册失败跳转到错误页面
    			return "register_failure";
    		}
    
    	}
    
    	@RequestMapping(value = "/login.action", method = RequestMethod.POST)
    	public String login(String userName, String passwd, Model model) {
    		System.out.println("用户登录：" + userName + "," + passwd);
    
    		String page = "";
    
    		User user2 = userService.login(userName, passwd);
    		if (user2 != null) {
    			model.addAttribute("msg", "登录成功");
    			page = "login_success";
    		} else {
    			model.addAttribute("msg", "登录失败");
    			page = "login_failure";
    		}
    
    		return page;
    	}
    }

17，修改 src/main/webapp/index.jsp：

18，新建 src/main/webapp/register.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>用户注册</title>
    </head>
    <body>
    	<form action="${pageContext.request.contextPath}/user/register.action" method="post">
    		<table border="1">
    			<tr>
    				<td>用户名</td>
    				<td><input type="text" name="userName"></td>
    			</tr>
    			<tr>
    				<td>昵称</td>
    				<td><input type="text" name="userAlias"></td>
    			</tr>
    			<tr>
    				<td>密码</td>
    				<td><input type="text" name="passwd"></td>
    			</tr>
    			<tr>
    				<td>邮件地址</td>
    				<td><input type="text" name="email"></td>
    			</tr>
    			<tr>
    				<td>角色</td>
    				<td><input type="text" name="userRole"></td>
    			</tr>
    			<tr>
    				<td><input type="submit" value="注册"></td>
    			</tr>
    		</table>
    	</form>
    </body>
    </html>

19，新建 src/main/webapp/register\_success.jsp：

20 ，新建 src/main/webapp/register\_failure.jsp：

21 ，新建 src/main/webapp/login.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    	<title>用户登录</title>
    </head>
    <body>
    	<form action="${pageContext.request.contextPath}/user/login.action" method="post">
    		<table border="1">
    			<tr>
    				<td>用户名</td>
    				<td><input type="text" name="userName"></td>
    			</tr>
    			<tr>
    				<td>密码</td>
    				<td><input type="text" name="passwd"></td>
    			</tr>
    			<tr>
    				<td><input type="submit" value="登录"></td>
    			</tr>
    		</table>
    	</form>
    </body>
    </html>

22 ，新建 src/main/webapp/login\_success.jsp：

23 ，新建 src/main/webapp/login\_failure.jsp：

24，在Eclipse菜单Run>Run Configurations>选中Maven Build，新建：

Name:ssm-demo\_package

Base directory:$\{workspace\_loc:/ssm-demo\}

Goals:clean package

点击Apply以及Run，开始生成ssm-demo.ware在D:\\development\\workspace\_eclipse-jee-oxygen-2-win32-x86\_64\\ssm-demo\\target目录。  
  
25，启动Tomcat，将ssm-demo.war拷贝到D:\\Programs\\apache-tomcat-7.0.86\\webapps目录。  
  
26，启动浏览器，在地址栏输入http://localhost:8080/ssm-demo，开始享受成功的喜悦吧~

[Link 1]: https://archive.apache.org/dist/maven/maven-3/3.5.2/binaries/apache-maven-3.5.2-bin.zip
[Link 2]: http://mirrors.hust.edu.cn/apache/tomcat/tomcat-7/v7.0.86/bin/apache-tomcat-7.0.86-windows-x64.zip
[Link 3]: https://dev.mysql.com/downloads/windows/installer/5.7.html
[Link 4]: http://iso.mirrors.ustc.edu.cn/eclipse/technology/epp/downloads/release/oxygen/2/eclipse-jee-oxygen-2-win32-x86_64.zip