最近專案又有一部分用到jdbc了。。。都快忘光了。。。複習了一下，在這記錄一下。肯定有有問題的地方，歡迎指正。

1. 轉實體類工具

/**
 * 公司名稱: 
 *  專案名稱: 
 * 版本號  : 1.0
 * 建立時間：2017/3/24 16:19
 * 建立人：leo
 **/
package com.shinow.slec.utils;

import java.lang.reflect.Field;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * 類說明：
 *ResultSet轉實體類
 * @author
 
 leo
 * @version Version 1.0
 * @project SLEC
 * @date 2017/3/24.
 */

public class GetBeanFromResultUtil {
    private GetBeanFromResultUtil() {
    }

    public static <T> List<T> getBeans(ResultSet resultSet, Class<T> className) {
        List<T> list = new ArrayList<T>();
        Field fields[] = className.getDeclaredFields();
        try
 
 {
            while (resultSet.next()) {
                T instance = className.newInstance();
                for (Field field : fields) {
                    Object result = resultSet.getObject(field.getName());
                    boolean flag = field.isAccessible();
                    field.setAccessible(true
 
);
                    field.set(instance, result);
                    field.setAccessible(flag);
                }
                list.add(instance);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return list;
    }

    public static <T> T getBean(ResultSet resultSet, Class<T> className) {
        T instance = null;
        try {
            instance = className.newInstance();
            Field fields[] = className.getDeclaredFields();
            for (Field field : fields) {
                Object result = resultSet.getObject(field.getName());
                boolean flag = field.isAccessible();
                field.setAccessible(true);
                field.set(instance, result);
                field.setAccessible(flag);
            }
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return instance;
    }

}

1. jdbc工具

package com.shinow.slec.utils;

import java.io.FileReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtil{
    private static Properties prop = null;
    private JDBCUtil() {
    }
    static{
        try{
            prop = new Properties();
            prop.load(new FileReader(JDBCUtils.class.getClassLoader().getResource("jdbc-police.properties").getPath()));
        }catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * 獲取連線
     * @throws ClassNotFoundException 
     * @throws SQLException 
     */
    public static Connection getConn() throws ClassNotFoundException, SQLException{
        // 1.註冊資料庫驅動
        Class.forName(prop.getProperty("jdbc.driver"));
        // 2.獲取連線
        return DriverManager.getConnection(prop.getProperty("jdbc.url"), prop.getProperty("jdbc.username"), prop.getProperty("jdbc.password"));

    }
    /**
     * 關閉連線
     */
    public static void close(ResultSet rs, Statement stat,Connection conn){
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                rs = null;
            }
        }
        if(stat!=null){
            try {
                stat.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                stat = null;
            }
        }
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                conn = null;
            }
        }

    }
}