Java 使用 DBCP mysql 连接池 做数据库操作

需要的jar包有 commons-dbutils , commons-dbcp , commons-pool , mysql-connector-java

本地database.propertties 配置为

driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost/mydatabase?useUnicode=true&characterEncoding=GBK
username=root
password=***

该文件创建在src根目录下

首先做一个DBCP工具类

 package JDBCDemo;

 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Properties;

 import javax.activation.DataSource;

 import org.apache.commons.dbcp.BasicDataSource;

 public class DBCPUtils {
     private DBCPUtils() {};
     private static BasicDataSource dbs = new BasicDataSource();
     private static String className="";
     private static String sqlUrl="";
     private static String sqlUser="";
     private static String sqlPassword="";
     static {
         initConfig();
         //设置基本信息
         dbs.setDriverClassName(className);
         dbs.setUrl(sqlUrl);
         dbs.setUsername(sqlUser);
         dbs.setPassword(sqlPassword);
         //对连接池控制数--可不配
         dbs.setInitialSize(10); //连接池初始化连接数
         dbs.setMaxActive(8); //最大链接数量
         dbs.setMaxIdle(5); //最大空闲数
         dbs.setMinIdle(5); //最小空闲数
     }
     public static BasicDataSource getDataSource() {
         return dbs;
     }
     private static void initConfig() {
         InputStream inf = JDBCUtils.class.getClassLoader().getResourceAsStream("database.propertties");
         Properties properties = new Properties();
         try {
             properties.load(inf);
             className = properties.getProperty("driverClass");
             sqlUrl = properties.getProperty("url");
             sqlUser = properties.getProperty("username");
             sqlPassword = properties.getProperty("password");
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

应用该工具类 结合 DBUtils 写的demo

 package JDBCDemo;

 import java.io.IOException;
 import java.io.InputStream;
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.Properties;
 import javax.management.RuntimeErrorException;
 import org.apache.commons.dbcp.BasicDataSource;
 import org.apache.commons.dbutils.QueryRunner;

 public class DBCPDemo {
     private static QueryRunner qr = new QueryRunner(DBCPUtils.getDataSource());
     public static void main(String[] args) {
         try {
             insert();
         } catch (Exception e) {
             e.printStackTrance();
         }
     }
     public static void insert() throws SQLException {
         String sql = "insert into zhangwu (name,money) values (?,?)";
         Object[] obj = {"麻将支出",100};
         int res = qr.update(sql,obj);
         if (res>0) {
             System.out.println("插入数据成功");
         }else {
             System.out.println("插入数据失败");
         }
     }
 }