1.连接池配置所需jar包,这里以oracle为例:
commons-collections-3.2.1.jar
commons-dbcp2-2.1.1.jar
commons-logging-1.2.jar
commons-pool-1.5.5.jar
commons-pool2-2.2.jar
ojdbc6.jar
2.编写配置文件dbcp.properties
#数据库驱动
driverClassName=oracle.jdbc.OracleDriver
#driverClassName=com.mysql.jdbc.Driver
#数据库连接地址
url=jdbc\:oracle\:thin\:@xxx.xxx.xxx.xxx\:1521\:orcl
#url=jdbc:mysql://localhost/lianjc
#用户名
username=123456
#密码
password=123456
#连接池的最大数据库连接数。设为0表示无限制
maxActive=30
#最大空闲数,数据库连接的最大空闲时间。超过空闲时间,数据库连
#接将被标记为不可用,然后被释放。设为0表示无限制
maxIdle=10
#最大建立连接等待时间。如果超过此时间将接到异常。设为-1表示无限制
maxWait=1000
#超过removeAbandonedTimeout时间后,是否进 行没用连接(废弃)的回收(默认为false,调整为true)
removeAbandoned=true
#超过时间限制,回收没有用(废弃)的连接(默认为 300秒,调整为180)
removeAbandonedTimeout=180
3.创建java数据库连接工具类
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp2.BasicDataSourceFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class DBManager {
private static final Log log = LogFactory.getLog(DBManager.class);
private static final String configFile = "dbcp.properties";
private static DataSource dataSource;
static {
Properties dbProperties = new Properties();
try {
dbProperties.load(DBManager.class.getClassLoader()
.getResourceAsStream(configFile));
dataSource = BasicDataSourceFactory.createDataSource(dbProperties);
Connection conn = getConn();
DatabaseMetaData mdm = conn.getMetaData();
log.info("Connected to " + mdm.getDatabaseProductName() + " "
+ mdm.getDatabaseProductVersion());
if (conn != null) {
conn.close();
}
} catch (Exception e) {
log.error("初始化连接池失败:" + e);
}
}
private DBManager() {
}
/**
* 获取链接,用完后记得关闭
*
* @see {@link DBManager#closeConn(Connection)}
* @return
*/
public static final Connection getConn() {
Connection conn = null;
try {
conn = dataSource.getConnection();
System.out.println("连接成功!");
} catch (SQLException e) {
log.error("获取数据库连接失败:" + e);
}
return conn;
}
/**
* 关闭连接
*
* @param conn
* 需要关闭的连接
*/
public static void closeConn(Connection conn) {
try {
if (conn != null && !conn.isClosed()) {
conn.setAutoCommit(true);
conn.close();
}
} catch (SQLException e) {
log.error("关闭数据库连接失败:" + e);
}
}
public static void main(String[] args) {
Connection conn = getConn();
closeConn(conn);
}
}