02环境搭建-注解

工程spring-java
1)file-new -maven project-等-quick start-工程名spring-java-finish
2)建包com.neuedu.module.dao
com.neuedu.module.servie
3)把上个工程建的dao,service拷贝过来(强调一下，service中引入的dao包必须更改)
4)新建包com.neuedu.config
5)在com.neuedu.config包下新建ModuleConfig.java

package com.neuedu.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
//@Configuration表示该文件为配置文件
//@ComponentScan表示扫描哪些包下的注解
@Configuration
@ComponentScan(basePackages={"com.neuedu.module"})
public class ModuleConfig {
  
}

6）在dao类上加注解@Repository("userDao") 表明我是仓储类

@Repository("userDao")
public class UserDaoImpl implements IUserDao {

    @Override
    public int login(String username, String pwd) {
        System.out.println(username+"登录"+"密码为:"+pwd);
        return 0;
    }
}

7)service类上加注解@Servcie("userService") 表明我是业务类
把userDao自动注入用@Autowired
完整代码：

package com.neuedu.module.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.neuedu.module.dao.IUserDao;
@Service("userService")
public class UserServiceImpl implements IUserService {
    @Autowired
private IUserDao userDao;
    @Override
    public int login(String username, String pwd) {
        return userDao.login(username, pwd);
    }
    public IUserDao getUserDao() {
        return userDao;
    }
    public void setUserDao(IUserDao userDao) {
        this.userDao = userDao;
    }
}

8）写测试类

package com.neuedu.spring_java;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.neuedu.config.ModuleConfig;
import com.neuedu.module.service.IUserService;

public class SpringJTest {
   @Test
   public void test1(){
      //加载配置文件 (AnnotationConfigApplicationContext注解配置文件方式)
       ApplicationContext ctx=new AnnotationConfigApplicationContext(ModuleConfig.class);
      //读取bean
       IUserService service=(IUserService) ctx.getBean("userService");
      //调用bean里的方法
       service.login("陈昊", "123456");
   }
}