IOC控制反转 举一个例子，我们之前写项目时，会分层。像dao层、service层。我们就编写这两个层，体会一下 IOC控制反转 dao层 接口 public interface userDao { void setuser(); } 实现 public class userDaoimpl implements userDao{ @Override public void setuser() {
一、Spring开发步骤 （1）在 pom.xml 中引入Spring相关依赖 <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.3.15</version> </dependency> （2）创建Bean public class UserDaoI
环境在spring-Bean（一）的配置下 https://www.cnblogs.com/doubleconquer/p/15603706.html 来查看ApplicationContext的执行顺序 默认是无参构造 修改实现类（添加一个接口） public class UserDaoImpl implements UserDao { public UserDaoImpl() { System.out.println(
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDaoImpl' defined in file [D:\dev\idea\spring-02-AOP1\out\produ
spring-dao.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" xsi:schemaLocation="
