ssm: spring springmvc mybatis spring： 1.控制反转 —》 控制转移 2.依赖注入 DI 3.面向切面 aop

springmvc： servlet

mybatis ： jdbc

maven: 管理我们的jar包的 --》将镜像改为阿里云的镜像

 public class User { 
             public User() { 
             }      public User(int id, String username, String password) { 
                 this.id = id;         this.username = username;         this.password = password;     }      public User(String username, String password) { 
                 this.username = username;         this.password = password;     }      private int id;     private String username;     private String password;      public int getId() { 
                 return id;     }      public void setId(int id) { 
                 this.id = id;     }      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;
    }

    @Override
    public String toString() { 
        
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

import com.zhongruan.bean.User;
import com.zhongruan.service.IUserService;
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;

@Controller
@RequestMapping("/user")
public class UserController { 
        

    @Autowired
    private IUserService userService;

    @RequestMapping("/login.do")
    public ModelAndView login(User user){ 
        
        boolean flag =userService.login(user.getUsername(),user.getPassword());
        ModelAndView modelAndView=new ModelAndView();
        if (flag){ 
        
            modelAndView.setViewName("../ok");
        }else { 
        
            modelAndView.setViewName("../failure");
        }
        return  modelAndView;


    }
}

import com.zhongruan.bean.User;

public interface UserDao { 
        
    User findUserByUserName(String username);
}

import com.zhongruan.bean.User;
import com.zhongruan.dao.UserDao;
import com.zhongruan.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService implements IUserService { 
        

    @Autowired
    private UserDao userDao;

    @Override
    public boolean login(String username, String password) { 
        
        User user=userDao.findUserByUserName(username);
        if (user!=null && user.getPassword().equals(password)){ 
        
            return true;
        }
        return false;
    }
}

public interface IUserService { 
        
    boolean login(String username,String password);
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <!-- 配置加载类路径的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext.xml</param-value>
  </context-param>

  <!-- 配置监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <listener>
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
  </listener>

  <!-- 解决中文乱码过滤器 -->
  <filter>
    <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern> </filter-mapping> <!-- 前端控制器（加载classpath:spring-mvc.xml 服务器启动创建servlet） --> <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 配置初始化参数，创建完DispatcherServlet对象，加载springmvc.xml配置文件 --> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <!-- 服务器启动的时候，让DispatcherServlet对象创建 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app> 

<?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.zhongruan.dao.UserDao" >
    <select id="findUserByUserName" parameterType="String" resultType="user">
        select * from tb_user where username=#{ 
        username}
    </select>


</mapper>