Hikari java数据库连接池实战

环境InterlliJ2016.3  MySQL5.7.12

gradle依赖库：

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.11'

    compile 'org.slf4j:slf4j-log4j12:1.7.21'

    compile 'mysql:mysql-connector-java:5.1.39'

    compile 'com.zaxxer:HikariCP:2.4.6'
}

配置文件db.properties

db_url = 192.168.199.132
db_port = 3306
db_name = mind
db_max_conn = 100
db_username = root
db_password = root

DBService.Java：

package com.mind.core.db.impl;


import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

/**
 * 数据库服务
 * Created by Lovell on 16/6/18.
 */
public class DBService {
    private static Logger logger = LoggerFactory.getLogger(DBService.class);

    private static final String DB_CONFIG_FILE = "/db.properties";

    // 数据库连接数
    private short db_max_conn = 0;

    // 数据库服务器addr
    private String db_url = null;

    // 数据库连接端口
    private short db_port = 0;

    // 数据库名称
    private String db_name = null;

    // 数据库登录用户名
    private String db_username = null;

    // 数据库登录密码
    private String db_password = null;

    // 数据库连接
    private Connection connection;

    private static DBService dBService;
    public static DBService getInstance(){
        if (dBService == null) {
            dBService = new DBService();
        }
        return dBService;
    }

    public void start() throws IOException, SQLException {
        Properties properties = new Properties();
        InputStream in = DBService.class.getClass().getResourceAsStream(DB_CONFIG_FILE);
        properties.load(in);

        db_max_conn = Short.valueOf(properties.getProperty("db_max_conn"));
        db_url = String.valueOf(properties.getProperty("db_url"));
        db_port = Short.valueOf(properties.getProperty("db_port"));
        db_name = String.valueOf(properties.getProperty("db_name"));
        db_username = String.valueOf(properties.getProperty("db_username"));
        db_password = String.valueOf(properties.getProperty("db_password"));

        if (db_url == null || db_url.length() == 0) {
            logger.error("配置的数据库ip地址错误!");
            System.exit(0);
        }

        HikariConfig config = new HikariConfig();
        config.setMaximumPoolSize(db_max_conn);
        config.setDataSourceClassName("com.mysql.jdbc.jdbc2.optional.MysqlDataSource");
        config.addDataSourceProperty("serverName", db_url);
        config.addDataSourceProperty("port", db_port);
        config.addDataSourceProperty("databaseName", db_name);
        config.addDataSourceProperty("user", db_username);
        config.addDataSourceProperty("password", db_password);
        HikariDataSource dataSource = new HikariDataSource(config);

//        // 也可以这样写
//        config.setDriverClassName("com.mysql.jdbc.Driver");
//        config.setJdbcUrl("jdbc:mysql://"+ db_url +"/" + db_name + "?useUnicode=true&characterEncoding=utf8&useSSL=false");
//        config.setUsername(db_username);
//        config.setPassword(db_password);
//        config.addDataSourceProperty("cachePrepStmts", "true");
//        config.addDataSourceProperty("prepStmtCacheSize", "250");
//        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
//        // 设置连接超时为8小时
//        config.setConnectionTimeout(8 * 60 * 60);
//        HikariDataSource dataSource = new HikariDataSource(config);
    }

 
    public Connection getConnection() throws SQLException {
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            e.printStackTrace();
            dataSource.resumePool();
            return null;
        }    }

    public boolean stop() throws SQLException {
        dataSource.close();
        return true;
    }
}

DBServiceTest.java

package com.mind.core.db.impl;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Created by Lovell on 16/6/25.
 */
public class DBServiceTest {
    public static void main(String[] args) throws IOException, SQLException {
        DBSservice.getInstance().start();

        // statement用来执行SQL语句
        Statement statement = DBService.getInstance().getConnection().createStatement();

        // 要执行的SQL语句id和content是表review中的项。
        String sql = "select * from login where name='Lovell' and password='123456'";

        // 得到结果
        ResultSet rs = statement.executeQuery(sql);

        if(rs.next()){
            System.out.println("Logon");

        }else{
            System.out.println("Login Faild");
        }
        rs.close();
    }
}