本帖最后由 小刀葛小伦 于 2019-12-19 09:24 编辑
项目结构首先看一下整个项目的目录结构,如下:
导入Jar包
工欲善必先利其器,导入一下Jar包,对应的jar包我已经分享在百度云网盘,大家可以下载,网址如下:
链接:https://pan.baidu.com/s/1m5NCIQeiKZn5llosp7Iv6A 提取码:s5l2
配置文件
web.xml
配置 web.xml配置文件,如下:
[XML] 纯文本查看 复制代码 <?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 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
[url=http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd]http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd[/url]">
<!-- 上下文参数 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<!-- spring配置文件 -->
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- 封装了一个监听器,帮助加载Spring的配置文件 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
applicationContext.xml
创建applicationContext.xml配置文件,如下:
获取数据源,数据库相关配置(注意:要配置自己的数据库相关信息),beanID:dataSource。
创建 SqlSessionFactory,beanID:factory。
扫描器配置,扫描接口,并创建接口对象。
由spring管理service实现类,beanID:userService。
[XML] 纯文本查看 复制代码 <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
[url=http://www.springframework.org/schema/beans/spring-beans.xsd]http://www.springframework.org/schema/beans/spring-beans.xsd[/url]">
<!-- 数据源封装类,数据源:获取数据库连接 -->
<bean id="dataSouce" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName"
value="com.mysql.jdbc.Driver"></property>
<property name="url"
value="jdbc:mysql://localhost:3306/spring"></property>
<property name="username" value="root"></property>
<property name="password" value="123456"></property>
</bean>
<!--spring帮助创建SqlSessionFactory-->
<bean id="factory"
class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSouce"></property>
</bean>
<!-- 扫描器相当于mybatis.xml中的mappers下package标签 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 要扫描哪个包 -->
<property name="basePackage" value="com.spring.mapper"></property>
<!-- 和factory产生关系 -->
<property name="sqlSessionFactory" ref="factory"></property>
</bean>
<!-- 由spring管理service实现类 -->
<bean id="userService"
class="com.spring.service.impl.UsersServiceImpl">
<property name="usersMapper" ref="usersMapper"></property>
</bean>
</beans>
创建数据库
创建对应的用户表,如下:
数据库信息为:spring库,users表。
代码实现
创建Users类
先创建一个用户类Users,如下:
[Java] 纯文本查看 复制代码 public class Users {
private int user;
private String username;
private String password;
public int getUser() {
return user;
}
public void setUser(int user) {
this.user = user;
}
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;
}
}
创建UsersMapper类
创建UsersMapper类,如下:
[Java] 纯文本查看 复制代码 public interface UsersMapper {
@Select("select * from users where username=#{username} and password=#{password}")
Users selByUsersPwd(Users users);
}
创建UsersService接口
创建UsersService类,如下:
[Java] 纯文本查看 复制代码 public interface UsersService {
/**
* 登录
* @param users
* @return
*/
Users login(Users users);
}
创建UsersServiceImpl类
创建UsersService接口实现类,如下:
[Java] 纯文本查看 复制代码 public class UsersServiceImpl implements UsersService {
private UsersMapper usersMapper;
public UsersMapper getUsersMapper() {
return usersMapper;
}
public void setUsersMapper(UsersMapper usersMapper) {
this.usersMapper = usersMapper;
}
@Override
public Users login(Users users) {
// TODO Auto-generated method stub
return usersMapper.selByUsersPwd(users);
}
}
创建LoginServlet类
创建LoginServlet类,如下:
[Java] 纯文本查看 复制代码 @WebServlet("/login")
public class LoginServlet extends HttpServlet {
private UsersService usersService;
//从spring中取出UsersServiceImpl
public void init()throws ServletException{
ApplicationContext ac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
usersService = ac.getBean("usersService",UsersServiceImpl.class);
}
protected void service(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException {
req.setCharacterEncoding("utf-8");
//获取验证码
String code = req.getParameter("code");
//到session中获取验证码
String codeSession = req.getSession().getAttribute("code").toString();
//判断验证码是否正确
if(codeSession.equals(code)) {
//获取用户名
String username = req.getParameter("username");
//获取密码
String password = req.getParameter("password");
//创建users对象
Users users = new Users();
users.setUsername(username);
users.setPassword(password);
//登录
Users user = usersService.login(users);
if(user!=null) {
resp.sendRedirect("main.jsp");
}else {
req.setAttribute("error", "用户名或密码不正确!");
req.getRequestDispatcher("index.jsp").forward(req, resp);
}
}else {
req.setAttribute("error", "验证码不正确");
req.getRequestDispatcher("index.jsp").forward(req, resp);
}
}
}
测试实例
成功页面,如下:
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