反射在数据库读写中的应用

MySQLDao.java

package cn.sgy.reflection1.exer;


public class MySQLDao implements Dao{


    @Override
    public void insert(User user) {
        System.out.println("向MySQL插入用户对象:"+ user.getName());
    }

    @Override
    public void delete(User user) {
        System.out.println("从MySQL中删除用户对象:"+ user.getName());
    }
    
    

}

 

User.java

package cn.sgy.reflection1.exer;

import java.sql.Date;

public class User {

    
    
    private String name;
    private int age;
    private char gender;
    private Date birth;
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public char getGender() {
        return gender;
    }
    public void setGender(char gender) {
        this.gender = gender;
    }
    public Date getBirth() {
        return birth;
    }
    public void setBirth(Date birth) {
        this.birth = birth;
    }
    
    
    
}

 

 

OracleDao.java

 

package cn.sgy.reflection1.exer;

public class OracleDao implements Dao{

    @Override
    public void insert(User user) {
        System.out.println("向Oracle中插入用户："+ user.getName());
    }

    @Override
    public void delete(User user) {
        System.out.println("从Oracle中删除用户："+ user.getName());
    }

}

 

Service.java

package cn.sgy.reflection1.exer;


public class Service {

    private Dao dao = DaoFactory.getFactory().getDaoInsance();

    public void insert() {

        User user = new User();

        dao.insert(user);
    }

    public void delete() {

        User user = new User();
        dao.delete(user);

    }

    public static void main(String[] args) throws Exception {

        while (true) {
            Service s = new Service();

            s.insert();

            Thread.sleep(10000);
        }
    }

}

 

 

DaoFactory.java

package cn.sgy.reflection1.exer;

import java.io.FileInputStream;
import java.util.Properties;



//工厂模式
public class DaoFactory {

    
    private static DaoFactory factory = new DaoFactory();
    
    private Properties p = new Properties();
    
    private DaoFactory() {
        
    }
    
    public static DaoFactory getFactory() {
         
        return factory ;
        
    }
    
    @SuppressWarnings("unchecked")
    public Dao getDaoInsance() {
        try {
            p.load(new FileInputStream("config.properties"));
            
            String name =  p.getProperty("Dao");
            
            Class<Dao> clz = (Class<Dao>) Class.forName(name);
            
            return  clz.newInstance();
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
    
}