ssm框架整合以及登录案例

<?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>

    <!--配置延迟加载-->
    <settings>
        <setting name="lazyLoadingEnabled" value="true"/>
    </settings>

    <!--配置别名,配置实体类下的别名,方便其对数据的输入和输出的操作-->
    <typeAliases>
        <package name="cn.ujiuye.domain"/>
    </typeAliases>

    <!--后端分页的插件,使用其插件的用法,能够大大的减少其关于分页的写法-->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!--配置连接的相关的数据库的方言-->
            <property name="helperDialect" value="mysql"/>
        </plugin>
    </plugins>

    <!--引入映射配置文件,扫描该包下的所有的配置的文件-->
    <mappers>
        <package name="cn.ujiuye.dao"/>
    </mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">

    <!--开启注解的扫描,只扫描Controllerz注解-->
    <context:component-scan base-package="cn.ujiuye">
        <!--只扫描Contrlller的注解-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--配置试图解析器对象-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
          <property name="prefix" value="/views/"></property>
          <property name="suffix" value=".jsp"></property>
    </bean>

    <!--过滤静态资源-->
    <!--<mvc:resources mapping="/img/**" location="/img/" />
    <mvc:resources mapping="/static/**" location="/static/" />
    <mvc:resources mapping="/views/**" location="/views/" />-->
    <mvc:default-servlet-handler/>

    <!--开启springmvc注解的支持-->
    <mvc:annotation-driven/>
</beans>

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <!--解决中文乱码问题,配置一个过滤器-->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!--filter过滤器为了做UTF-8解决编码格式问题-->
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--配置监听器,默认只加载WEB-INF目录下的applicationContext.xml配置文件,
      主要是监听web项目的创建,刚开始显然service层(没有调用其spring.xml)的业务没有办法注入到容器中,
      通过监听监听的加载而实现了加载的过程,从而实现加载的过程,从而实现了注入
      -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--设置applicationContext.xml配置文件的路径-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationConContext.xml</param-value>
  </context-param>

  <!--配置前端控制器-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--加载springmvc.xml配置文件-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <!--启动服务器,就加载这个servlet-->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

package cn.ujiuye.controller;

import cn.ujiuye.domain.User;
import cn.ujiuye.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;
import java.util.List;

/**
 * @author liugang
 * @date 2019/10/18
 */
@Controller
public class UserController {

    //将service对象注入到controller层
    @Autowired
    private UserService userService;
    /**
     * 使用账号和密码判断该用户是否能够登录成功
     * @return
     */
    @RequestMapping("/login")
    public String LoginUser(User user, HttpSession session){
        User loginUser = userService.login(user);
        if (loginUser != null){
            session.setAttribute("user",loginUser);
            return "index";
        }
        return "../login";
    }

}

package cn.ujiuye.service;

import cn.ujiuye.domain.User;

import java.util.List;

/**
 * @author liugang
 * @date 2019/10/18
 */
public interface UserService {
    /**
     * 根据传递过来的数据查训用户的信息是否存在
     * @param user
     * @return
     */
    public  User login(User user);
}


package cn.ujiuye.service.impl;

import cn.ujiuye.dao.UserDao;
import cn.ujiuye.domain.User;
import cn.ujiuye.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author liugang
 * @date 2019/10/18
 */
@Service("userService")
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;
    /**
     * 根据用于登录的信息返回该用户的信息
     * @param user
     * @return
     */
    @Override
    public User login(User user) {
        return userDao.loginUser(user);
    }
}

package cn.ujiuye.controller;

import cn.ujiuye.domain.User;
import cn.ujiuye.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;
import java.util.List;

/**
 * @author liugang
 * @date 2019/10/18
 */
@Controller
public class UserController {

    //将service对象注入到controller层
    @Autowired
    private UserService userService;

    /**
     * 使用账号和密码判断该用户是否能够登录成功
     * @return
     */
    @RequestMapping("/login")
    public String LoginUser(User user, HttpSession session){
        User loginUser = userService.login(user);
        if (loginUser != null){
            session.setAttribute("user",loginUser);
            return "index";
        }
        return "../login";
    }

}