很久之前用SSM框架写了一个注册登录的小程序(当然前端用的是模板),也算是自己的入门之作。今晚稍作修改,拿出来给大家学习,程序也许会有BUG,还请见谅。

下面说一下我的运行环境:

*
Myeclipse 2017 CI 1

*
MySQL 5.7

* Tomcat 8.5
项目结构如下



 

 

 

在数据库中新建user表:



有几个主要的配置文件,先了解下每个配置文件的作用。

1. web.xml:当服务启动时首先会去加载web.xml这个资源文件,里面包括了对前端控制器、乱码问题等配置。

2.applicatonContext.xml : 一般配置数据源,事物,注解 等。

在这里我使用的是applicatonContext-*.xml的形式将DAO层、Service层、Transaction层分开配置,这样便于管理

分别为applicatonContext-dao.xml、applicatonContext-service.xml、
applicatonContext-transaction.xml

分开配置时,需要在web.xml中配置上下文位置

3.springmvc.xml: 里面配置的是控制层的 ,如视图解析器静态资源, mvc 文件上传,拦截器等。

4.SqlMapConfig.xml: 该配置文件为MyBatis的配置文件,里面无需配置,一切交给spring管理,但是xml文件基础配置要有。

    持久层相关配置文件 applicationContext-dao.xml
<?xml version="1.0" encoding="UTF-8"?> <beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 配置
读取properties文件 jdbc.properties --> <context:property-placeholder
location="classpath:jdbc.properties" /> <!-- 配置 数据源 --> <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> <!--
配置SqlSessionFactory --> <bean class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 设置MyBatis核心配置文件 --> <property name="configLocation"
value="classpath:SqlMapConfig.xml" /> <!-- 设置数据源 --> <property
name="dataSource" ref="dataSource" /> <!-- 别名包扫描 --> <property
name="typeAliasesPackage" value="com.zhu.pojo" /> </bean> <!-- 配置Mapper扫描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--
设置Mapper扫描包 --> <property name="basePackage" value="com.zhu.mapper" /> </bean>
</beans>
    applicationContext-service.xml
<?xml version="1.0" encoding="UTF-8"?> <beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!--
配置@Service类的包扫描 --> <context:component-scan base-package="com.zhu.service"/>
</beans>
  applicationContext-trans.xml
<?xml version="1.0" encoding="UTF-8"?> <beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!--
数据源 --> <property name="dataSource" ref="dataSource" /> </bean> <!-- 通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes> <!-- 传播行为 --> <tx:method name="save*" propagation="REQUIRED" />
<tx:method name="insert*" propagation="REQUIRED" /> <tx:method name="add*"
propagation="REQUIRED" /> <tx:method name="create*" propagation="REQUIRED" />
<tx:method name="delete*" propagation="REQUIRED" /> <tx:method name="update*"
propagation="REQUIRED" /> <tx:method name="find*" propagation="SUPPORTS"
read-only="true" /> <tx:method name="select*" propagation="SUPPORTS"
read-only="true" /> <tx:method name="get*" propagation="SUPPORTS"
read-only="true" /> <tx:method name="query*" propagation="SUPPORTS"
read-only="true" /> </tx:attributes> </tx:advice> <!-- 切面 --> <aop:config>
<aop:advisor advice-ref="txAdvice" pointcut="execution(*
com.zhu.service.*.*(..))" /> </aop:config> </beans>
springmvc.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!--
配置Controller扫描 --> <context:component-scan base-package="com.zhu.controller" />
<!-- 配置注解驱动 --> <mvc:annotation-driven /> <!-- 配置视图解析器 --> <bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!--
前缀 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 后缀 --> <property
name="suffix" value=".jsp" /> </bean> </beans>
  SqlMapConfig.xml这个无需设置,但是必须要有
<?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> </configuration>
配置文件写好了,接下来就开始写代码

先从Mapper开始写:

* 先写一个接口UserMapper.java package com.zhu.mapper; import com.zhu.pojo.User;
public interface UserMapper { //登录验证 User logincheck(User user); //注册 void
register(User user); }
    2.            在写一个UserMapper.xml与之相关联
<?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.zhu.mapper.UserMapper"> <select id="logincheck"
parameterType="com.zhu.pojo.User" resultType="com.zhu.pojo.User"> select * from
user <where> <if test="name != null and name != ''"> and `name` = #{name} </if>
<if test="pwd != null and pwd != ''"> AND `pwd` = #{pwd} </if> </where>
</select> <insert id="register" parameterType="com.zhu.pojo.User"> insert into
user(name,pwd) value(#{name},#{pwd}) </insert> </mapper>
    3.接下来就是Service层了,先写一个接口:UserService.java,内容与UserMapper.java一样

    4.然后写一个类实现UserService.java,代码比较简单,不做过多解释,大家不要忘了要给给它标记@Service
package com.zhu.service; import
org.springframework.beans.factory.annotation.Autowired; import
org.springframework.stereotype.Service; import com.zhu.mapper.UserMapper;
import com.zhu.pojo.User; @Service public class UserServiceImpl implements
UserService { //属性注入 @Autowired private UserMapper usermapper; @Override public
User logincheck(User user) { User u = usermapper.logincheck(user); return u; }
@Override public void register(User user) { usermapper.register(user); } }
   5.最后就是Controller层了,Controller层的代码主要是调用Service层实现的方法,实现一些操作,并与前端进行交互。

      UserController.java
package com.zhu.controller; 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
org.springframework.web.bind.annotation.RequestParam; import com.zhu.pojo.User;
import com.zhu.service.UserService; @Controller public class UserController {
@Autowired private UserService userService; //转向登录页面 @RequestMapping("tologin")
public String tologin(){ return "login"; } //登录验证 @RequestMapping("login")
public String login(@RequestParam("username") String username,
@RequestParam("password") String password,Model model){ User user = new User();
user.setName(username); user.setPwd(password); if(userService.logincheck(user)
!= null){ model.addAttribute("username",username); return "index"; } else{
model.addAttribute("error","账号或密码错误"); return "login"; } } //转向注册页面
@RequestMapping("toregister") public String toregister(){ return "register"; }
//注册 @RequestMapping("register") public String
register(@RequestParam("username") String username, @RequestParam("password")
String password){ User user = new User(); user.setName(username);
user.setPwd(password); userService.register(user); return "login"; } }
代码链接:https://download.csdn.net/download/qq_22774179/10675002
<https://download.csdn.net/download/qq_22774179/10675002>

效果演示:http://gikhg574109.jsp.jspee.com.cn/LoginAndRegister/tologin.action
<http://gikhg574109.jsp.jspee.com.cn/LoginAndRegister/tologin.action>

(第二次写,写的不是很好,还请见谅!)