SpringMVC:父子工厂划分（springmvc的耦合问题）

从功能角度没有存在问题，但是在设计角度存在缺陷，就是MVC层与其他层次存在耦合，

如果日后，替换了MVC的实现，整体的代码都将受到影响，如果日后把SpringMVC换成Strus2，Webflat的话，换了MVC不仅仅影响MVC的内容，也影响到其他层次

通过两个工厂，解决MVC层与非MVC层之间的耦合

父容器：

子工厂：

diapatcher.xml：

在web.xml中添加父容器ContextLoadListener创建工厂 ：

web.xml：

    
        org.springframework.web.context.ContextLoaderListener
    

    
        contextConfigLocation
        classpath:applicationContext.xml
    

    
        encodingFilter
        org.springframework.web.filter.CharacterEncodingFilter
        
            encoding
            UTF-8
        
    
    
        encodingFilter
        /*
    





    dispatcherServlet
    org.springframework.web.servlet.DispatcherServlet
    
    
        contextConfigLocation
        classpath:dispatcher.xml
    
    
    1



    dispatcherServlet
    /

    

父工厂：

applicationContext.xml：

    


    
    
        
        
        
        
    

    
    
        
        
        
        
        
        
            
            
                classpath:com.baizhiedu.mapper/*Mapper.xml
            
        
    

    
    
        
        
    

    
    
        
    

    
    

User：

package com.baizhiedu.entity;

public class User {
    private Integer id;
    private String name;
    private String password;

    public User() {
    }

    public User(Integer id, String name, String password) {
        this.id = id;
        this.name = name;
        this.password = password;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

UserDAO:

package com.baizhiedu.dao;

import com.baizhiedu.entity.User;

public interface UserDAO {
    public void save(User user);
}

UserDAOMapper.xml：

    
    
    
        insert into tb_users(name,password) values (#{name},#{password})
    

UserService：

package com.baizhiedu.service;

import com.baizhiedu.entity.User;

public interface UserService {
    public void register(User user);
}

UserServiceImpl：

package com.baizhiedu.service;

import com.baizhiedu.dao.UserDAO;
import com.baizhiedu.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service //使用@Service注解创建这个类的对象
@Transactional //使用注解，添加事务属性
public class UserServiceImpl implements UserService {

    @Autowired //注入userdao
    private UserDAO userDAO;

    @Override
    public void register(User user) {
        userDAO.save(user);
    }
}

控制器：

UserController：

package com.baizhiedu.controller;

import com.baizhiedu.entity.User;
import com.baizhiedu.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

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

    @Autowired
    private UserService userService;

    @RequestMapping("/register")
    public String register(User user){
        userService.register(user);
        return "regOk";
    }
}

reg.jsp：

<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/6/4
  Time: 18:07
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>


    
    


  

      UserName:

      Password:

      
  

regOk.jsp：

<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/6/4
  Time: 18:06
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>


    
    


   RegOK

现在的ssm整合开发父子容器处理过程当中是没有事务的，下面打印没有输出create new Transction开启事务

解决：在包扫描上子容器不扫描com.baizhiedu这个包，只让他扫描com.baizhiedu.Controller，这样他就不会创建Service对象，他就会往父容器里面找Service

 让zi工厂只创建Controller：

diapatcher.xml：

让父容器排除创建Controller：

    
        
        
    


    
    
        
        
        
        
    

    
    
        
        
        
        
        
        
            
            
                classpath:com.baizhiedu.mapper/*Mapper.xml
            
        
    

    
    
        
        
    

    
    
        
    

    
    

从新运行，添加上了事务：