Java-DBCP连接池

创建项目：

 

导入jar包：

　　参见上图。

 

JDBCConn.java获取数据源类：

package com.gordon.jdbcconn;

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

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSource;

public class JDBCConn {

	private static String DRIVERNAME = null;
	private static String URL = null;
	private static String USER = null;
	private static String PASSWORD = null;

	private static BasicDataSource datasource = new BasicDataSource();

	static {
		try {

			Properties props = new Properties();
			InputStream in = JDBCConn.class.getClassLoader().getResourceAsStream("db.properties");
			props.load(in);

			DRIVERNAME = props.getProperty("drivername");
			URL = props.getProperty("url");
			USER = props.getProperty("user");
			PASSWORD = props.getProperty("password");

		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static DataSource getDatasource() throws Exception {
		
		/*
			driverClassName	数据库驱动名称
			url				数据库的地址
			username		用户名
			password		密码
			maxActive		最大连接数量
			minIdle			最小空闲连接
			maxIdle 		最大空闲连接
			initialSize		初始化连接
		 */
		
		datasource.setDriverClassName(DRIVERNAME);
		datasource.setUrl(URL);
		datasource.setUsername(USER);
		datasource.setPassword(PASSWORD);
		
		return datasource;
	}
}

　　

DBCPTest.java测试类：

package com.gordon.dbcp;

import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ArrayListHandler;

import com.gordon.jdbcconn.JDBCConn;

public class DBCPTest {
	public static void main(String[] args) {
		try {

			selectFunction();
			insertFunction();
			selectFunction();

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	public static void insertFunction() throws Exception {
		QueryRunner qr = new QueryRunner(JDBCConn.getDatasource());
		
		String sql = "INSERT INTO user (name) VALUES (?)";
		
		Object[] params = {"testname"};
		
		int res = qr.update(sql, params);
		
		if(res > 0) {
			System.out.println("insert success.");
		} else {
			System.out.println("insert faild.");
		}
	}
	
	public static void selectFunction() throws Exception {
		QueryRunner qr = new QueryRunner(JDBCConn.getDatasource());

		String sql = "SELECT * FROM user";

		Object[] params = {};

		List<Object[]> objList = qr.query(sql, new ArrayListHandler(), params);

		for (Object[] objs : objList) {
			for (Object obj : objs) {
				System.out.print(obj + " ");
			}
			System.out.println();
		}
	}
}