druid連接池工具類

package cn.td.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 * druid連接池工具類
 */
public class JDBCUtils {

    private static DataSource dataSource;

    static {
        Properties properties = new Properties();
        //加載src路徑下的配置文件
        InputStream resourceAsStream = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
        try {
            properties.load(resourceAsStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //獲取連接池對象
        try {
            dataSource = DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取連接池
     * @return 連接池對象
     */
    public static DataSource getDataSource(){
        return dataSource;
    }

    /**
     * 獲取連接
     * @return 連接對象
     */
    public static Connection getConnection(){
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 資源歸還
     * @param statement 執行SQL語句的對象
     * @param connection 連接對象
     */
    public static void close(Statement statement, Connection connection){
        close(null,statement,connection);
    }

    /**
     * 資源歸還
     * @param resultSet 結果集
     * @param statement statement對象
     * @param connection 連接對象
     */
    public static void close(ResultSet resultSet, Statement statement, Connection connection){
        if(resultSet!=null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement!=null) {
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(connection!=null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}