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<dePEndencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.9</version>
</dependency>
</dependencies>
package com.xiang.dao;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/9/22 10:55
*/
public interface UserDao {
String show();
}
package com.xiang.dao.impl;
import com.xiang.dao.UserDao;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/9/22 10:56
*/
public class UserDaoImpl1 implements UserDao {
@override
public String show() {
return "查询用户信息1";
}
}
package com.xiang.dao.impl;
import com.xiang.dao.UserDao;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/9/22 10:56
*/
public class UserDaoImpl2 implements UserDao {
@Override
public String show() {
return "查询用户信息2";
}
}
package com.xiang.service;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/9/22 10:57
*/
public interface UserService {
String show();
}
package com.xiang.service;
import com.xiang.dao.UserDao;
import com.xiang.dao.impl.UserDaoImpl1;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/9/22 10:57
*/
public class UserServiceImpl implements UserService{
// private UserDaoImpl1 userDaoImpl1 = new UserDaoImpl1();
private UserDao userDao;
/**
* set 注入
* @param userDao
*/
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
/**
* 构造方法
* 构造器 注入
* @param userDao
*/
public UserServiceImpl(UserDao userDao){
this.userDao = userDao;
}
/**
* 调方法
* @return
*/
@Override
public String show() {
return userDao.show();
}
}
package com.xiang.service;
import com.xiang.dao.impl.UserDaoImpl1;
import com.xiang.dao.impl.UserDaoImpl2;
import org.junIT.test;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/9/22 11:00
*/
public class UserServiceImplTest {
/**
* 普通方式查询
*/
// @Test
// public void Test01() {
// UserServiceImpl service = new UserServiceImpl();
// System.out.println(service.show());
// }
/**
* set 注入
*/
// @Test
// public void Test02() {
// UserServiceImpl service = new UserServiceImpl();
// service.setUserDao(new UserDaoImpl2());
// System.out.println(service);
// System.out.println(service.show());
// }
/**
* set 注入
*/
// @Test
// public void Test03() {
// UserServiceImpl service = new UserServiceImpl();
// service.setUserDao(new UserDaoImpl1());
// System.out.println(service);
// System.out.println(service.show());
// }
/**
* 构造器 注入
*/
@Test
public void Test04() {
UserServiceImpl service = new UserServiceImpl(new UserDaoImpl2());
System.out.println(service);
System.out.println(service.show());
}
}
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