SSM框架搭建------基于简单的用户登录注册

* 新建一个web project 为SSM

* 将所有需要用到的jar包导入WebRoot/WEB-INF/libs下
链接：https://pan.baidu.com/s/1Qast8z0Fb4m_ByN3kiuorQ
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密码：4ds3
* 配置WebRoot/WEB-INF/web.xml
web配置的标签及详解
<https://blog.csdn.net/Oceansidexue/article/details/www.cnblogs.com/hafiz/p/5715523.html>
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns=
"http://java.sun.com/xml/ns/javaee" xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=
"http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <!-- 设置欢迎页面 --> <
welcome-file-list> <welcome-file>/WEB-INF/jsp/register.jsp</welcome-file> </
welcome-file-list> <!-- 配置SpringMvc的前端控制器DispatcherServlet --> <servlet> <
servlet-name>springmvc</servlet-name> <servlet-class>
org.springframework.web.servlet.DispatcherServlet</servlet-class> <!--
springmvc配置文件的位置 --> <init-param> <param-name>contextConfigLocation</param-name>
<param-value>classpath:springconfig.xml</param-value> </init-param> </servlet>
<!--设置在jsp页面表单提交的action="*.action"行为 --> <servlet-mapping> <servlet-name>
springmvc</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping>
<!-- post方式中文乱码过滤器 --> <filter> <filter-name>CharEncodingFilter</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>
CharEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
</web-app>
4.配置db.properties
#jdbc.driver=oracle.jdbc.driver.OracleDriver
#jdbc.url=jdbc:oracle:thin:@10.10.21.3:1521:orcl #jdbc.username=scott
#jdbc.password=tiger jdbc.driver=com.mysql.jdbc.Driver jdbc.url
=jdbc:mysql://localhost:3306/studentdb?useUnicode=true&characterEncoding=utf8
jdbc.username=root jdbc.password=123456
5.配置springconfig.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" xmlns:task=
"http://www.springframework.org/schema/task" xmlns:tx=
"http://www.springframework.org/schema/tx" xsi:schemaLocation=
"http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-4.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"> <!-- 整合mybatis -->
<!-- 加载db.properties包含数据库的连接信息 --> <context:property-placeholder location=
"classpath:db.properties"/> <!-- 配置数据源 --> <bean id="dataSource" class=
"org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name
="driverClassName" value="${jdbc.driver}" /> <property name="url" value=
"${jdbc.url}" /> <property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property> <!-- 连接池的最大数 -->
<property name="maxActive" value="20"></property> <!-- 连接池最大空闲 --> <property
name="maxIdle" value="20"></property> </bean> <!-- 配置SqlSessionFactory --> <bean
id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <
property name="dataSource" ref="dataSource"></property> <!--
指定要扫描的mapper.xml文件的位置 --> <property name="mapperLocations" value=
"classpath:com/qut/mapper/*.xml"></property> </bean> <!-- mapper扫描，扫描mapper接口类
--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property
name="basePackage" value="com.qut.mapper"></property> <property name=
"sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> </bean> <!--
启动包的扫描功能，@controller等注解 --> <context:component-scan base-package="com.qut"></
context:component-scan> <!-- 模型视图的解析，请求逻辑视图名，添加前后缀 --> <bean class=
"org.springframework.web.servlet.view.InternalResourceViewResolver"> <property
name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=
".jsp"></property> </bean> <!-- 事务管理 --> <bean id="transactionManager" class=
"org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property
name="dataSource" ref="dataSource"></property> </bean> <!-- 支持@Transactional注解
--> <tx:annotation-driven transaction-manager="transactionManager"/> <
mvc:annotation-driven /> </beans>
6.在com.qut.pojo包下面建一个User类与数据库里面的表对应
package com.qut.pojo; public class User { private int id; private String name;
private String pwd; public int getId() { return id; } public void setId(int id)
{this.id = id; } public String getName() { return name; } public void setName
(String name) {this.name = name; } public String getPwd() { return pwd; } public
void setPwd(String pwd) { this.pwd = pwd; } }
7.在com.qut.mapper包下面写一个mapper接口UserMapper.java,定义mapper接口

此方法即mapper接口开发方法，只需定义mapper接口，不用编写mapper接口实现类。只需要在spring配置文件中定义一个mapper扫描器，自动扫描包中的mapper接口生成代代理对象
注意mapper.xml的文件名和mapper的接口名称保持一致，且放在同一个目录
package com.qut.mapper; import com.qut.pojo.User; public interface UserMapper {
/** * 插入用户信息 * */ public int insert(User user); /** * 查找用户 * @param user *
@return */ public User findUser(User user); }
8.配置mapper扫描器在com.qut.mapper包下新建UserMapper.xml
如果将mapper.xml和mapper接口的名称保持一致且放在一个目录 则不用在springconfig.xml中进行配置

ResultMap和ResultType的差别、ParameterMap和parameterType的差别
<https://blog.csdn.net/yxuan9826/article/details/78618017>
<?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"> <!--
namespace命名空间，作用就是对sql进行分类化管理，理解sql隔离 注意：使用mapper代理方法开发，namespace有特殊重要的作用 --> <
mapper namespace="com.qut.mapper.UserMapper"> <insert id="insert" parameterType=
"com.qut.pojo.User"> insert into user values(null,#{name},#{pwd}) </insert> <
select id="findUser" parameterType="com.qut.pojo.User" resultType=
"com.qut.pojo.User" > select * from user where name=#{name} and pwd=#{pwd} </
select> </mapper>
8.定义service接口
在com.qut.service下新建一个接口UserService.java
package com.qut.service; import com.qut.pojo.User; public interface UserService
{ public int register(User user); public User login(User user); }
9.实现service接口
在com.qut.service.impl包下新建一个UserServiceImpl.java
package com.qut.service.impl; import
org.springframework.beans.factory.annotation.Autowired;import
org.springframework.stereotype.Service;import
org.springframework.transaction.annotation.Transactional;import
com.qut.mapper.UserMapper;import com.qut.pojo.User; import
com.qut.service.UserService;@Service @Transactional(rollbackFor=Exception.class)
public class UserServiceImpl implements UserService{ @Autowired private
UserMapper userMapper;public int register(User user) { //调用dao操作数据库 return
userMapper.insert(user); }public User login(User user) { return
userMapper.findUser(user); } }
10.编写控制器
在com.qutcontroller包下新建一个UserController.java
package com.qut.controller; import
org.springframework.beans.factory.annotation.Autowired;import
org.springframework.stereotype.Controller;import
org.springframework.web.bind.annotation.RequestMapping;import
org.springframework.web.servlet.ModelAndView;import com.qut.pojo.User; import
com.qut.service.UserService;@Controller public class UserController { @Autowired
private UserService userService; @RequestMapping("/register") public
ModelAndViewregister(User user){ ModelAndView view = new ModelAndView(); int
res = userService.register(user);if(res!=1){ //回到注册界面 view.setViewName(
"register"); }else{ //登录界面 view.setViewName("login"); } return view; }
@RequestMapping("/login") public ModelAndView login(User user){ User u =
userService.login(user); ModelAndView view =new ModelAndView(); if(u!=null){
view.setViewName("main"); }else{ //添加错误信息 view.setViewName("login"); } return
view; } }
11.编写jsp显示页面

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