Java操作MySQL--使用HikariCP

package com.wyz.common;

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class HikariPoolManager {
    private static HikariDataSource dataSource;
    private static final String DB_CONFIG_FILE = "src/com/wyz/common/jdbc.properties";

    static {
        //读取jdbc配置文件
        Properties props = new Properties();
        try {
            InputStream in = new FileInputStream(new File(DB_CONFIG_FILE));
            props.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //初始化HikariConfig配置
        HikariConfig config = new HikariConfig();
        config.setJdbcUrl(props.getProperty("jdbcUrl"));
        config.setUsername(props.getProperty("username"));
        config.setPassword(props.getProperty("password"));
        config.addDataSourceProperty("cachePrepStmts", props.getProperty("dataSource.cachePrepStmts"));
        config.addDataSourceProperty("prepStmtCacheSize", props.getProperty("dataSource.prepStmtCacheSize"));
        config.addDataSourceProperty("prepStmtCacheSqlLimit", props.getProperty("dataSource.prepStmtCacheSqlLimit"));
        config.addDataSourceProperty("useServerPrepStmts", props.getProperty("dataSource.useServerPrepStmts"));
        config.addDataSourceProperty("useLocalSessionState", props.getProperty("dataSource.useLocalSessionState"));
        config.addDataSourceProperty("rewriteBatchedStatements", props.getProperty("dataSource.rewriteBatchedStatements"));
        config.addDataSourceProperty("cacheResultSetMetadata", props.getProperty("dataSource.cacheResultSetMetadata"));
        config.addDataSourceProperty("cacheServerConfiguration", props.getProperty("dataSource.cacheServerConfiguration"));
        config.addDataSourceProperty("elideSetAutoCommits", props.getProperty("dataSource.elideSetAutoCommits"));
        config.addDataSourceProperty("maintainTimeStats", props.getProperty("dataSource.maintainTimeStats"));
        //初始化HikariDataSource
        dataSource = new HikariDataSource(config);
    }

    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    public static void main(String[] args) throws SQLException {
        Connection connection = HikariPoolManager.getConnection();
        PreparedStatement ps = connection.prepareStatement("select * from user where username=? and password=?");
        ps.setString(1,"zhangsan");
        ps.setString(2,"123456");
        ResultSet ret = ps.executeQuery();

        while (ret.next()){
            int id = ret.getInt("id");
            String username = ret.getString("username");
            String password = ret.getString("password");
            System.out.println("id:"+id+",username:"+username+",password:"+password);
        }
        /**
         *
         ResultSetMetaData columns = ret.getMetaData();
         int columnCount = columns.getColumnCount();
         while (rs.next()) {
         Map<String, Object> resultMap = new HashMap<String, Object>();
         // 将结果返回成Map，key为列表名，value为该字段的值
         for (int j = 1; j <= columnNum; j++) {
         resultMap.put(columns.getColumnName(j), rs.getString(j));
         }
         list.add(resultMap);
         }
         *
         *
         */
    }
}

jdbcUrl=jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
username=root
password=wyz
dataSource.cachePrepStmts=true
dataSource.prepStmtCacheSize=250
dataSource.prepStmtCacheSqlLimit=2048
dataSource.useServerPrepStmts=true
dataSource.useLocalSessionState=true
dataSource.rewriteBatchedStatements=true
dataSource.cacheResultSetMetadata=true
dataSource.cacheServerConfiguration=true
dataSource.elideSetAutoCommits=true
dataSource.maintainTimeStats=false

上面是普通java的用法，如果要在servlet中使用，要用类加载器去加载配置文件，配置文件此时的相对路径相对的是当前类加载的根目录：