//用户类
public class User {
    private long id;
    private String username;
    private String password;
}

<dependency>
   <groupId>commons-dbcp</groupId>
   <artifactId>commons-dbcp</artifactId>
   <version>1.4</version>
</dependency>
<dependency>
  <groupId>cn.schoolwow</groupId>
  <artifactId>QuickDAO</artifactId>
  <version>2.10</version>
</dependency>

BasicDataSource mysqlDataSource = new BasicDataSource();
mysqlDataSource.setDriverClassName("com.mysql.jdbc.Driver");
mysqlDataSource.setUrl("jdbc:mysql://127.0.0.1:3306/quickdao");
mysqlDataSource.setUsername("root");
mysqlDataSource.setPassword("123456");
//指定实体所在包名
cn.schoolwow.quickdao.dao.DAO dao = QuickDAO.newInstance()
                    .dataSource(mysqlDataSource)
                    .packageName("cn.schoolwow.quickdao.entity")
                    .build();
//之后所有的操作使用dao对象完成