关于Spring注入之web经典三层架构的耦合

在此重新叙述关于set方法进行注入和@Autowired注解进行注入的问题：

set方法进行注入的时候，可以将任何类型进行注入，普通类型，引用类型和复杂类型，在applicationContext.xml配置文件中进行

<property name="" ref=""></property>然后可以将引用类型进行注入，而@Autowired也可以在类的内部对其他类进行注入先根据byName，再根据byType

在此根据注入举个关于耦合强度够高的dao层，service层和web层之间的具体连接

在dao层中：

package dao;

import pojo.User;

public interface UserDao {
public void addUser(User user);
}

package dao;

import pojo.User;

public class UserDaoImpl implements UserDao {

   public void addUser(User user) {
       // TODO Auto-generated method stub
       System.out.println("新增一个用户:"+user);
   }
}
在pojo层中：

package pojo;

public class User {
private String name;
private int age;
public User(String name, int age) {
   super();
   this.name = name;
   this.age = age;
}
@Override
public String toString() {
   return "User [name=" + name + ", age=" + age + "]";
}

}

在service层中：

package service;

import pojo.User;

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

package service;

import dao.UserDao;
import pojo.User;

public class UserServiceImpl implements UserService {
private UserDao userDao;

   public void setUserDao(UserDao userDao) {
       this.userDao = userDao;
   }

   @Override
   public void addUser(User user) {
       // TODO Auto-generated method stub
userDao.addUser(user);
   }

}

在web层中：

package web;

import pojo.User;
import service.UserService;

public class UserServlet {
   private UserService userService;

public void setUserService(UserService userService) {
       this.userService = userService;
   }

public void addUser(User user)
{
userService.addUser(user);
}
}
applicationContext.xml中：

Test测试类：

package test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import pojo.User;
import web.UserServlet;

public class TestSpring {
@Test
public void test01(){
   ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
   User user = (User) context.getBean("user");
   UserServlet userServlet = (UserServlet) context.getBean("userServlet");
   userServlet.addUser(user);
}
}

关于Spring注入之web经典三层架构的耦合

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