public?class?DBUtils?{

private?static?String?url?=?null;

private?static?String?username?=?null;

private?static?String?pwd?=?null;

private?static?DataSource?ds_pooled;

/**

*??加載數據庫連接的配置文件和驅動

*/

static{

FileInputStream?fis?=?null;

Properties?env?=?new?Properties();

try?{

fis?=?new?FileInputStream("dbconfig.properties");

//加載屬性文件中的數據庫配置信息

//以=左邊作為key值，右邊作為value值

env.load(fis);

//1.?加載驅動類

Class.forName(env.getProperty("jdbc.driver"));

url?=?env.getProperty("jdbc.url");

username?=?env.getProperty("jdbc.username");

pwd?=?env.getProperty("jdbc.pwd");

//設置連接數據庫的配置信息

DataSource?ds_unpooled?=?DataSources

.unpooledDataSource(url,?username,?pwd);

Map?pool_conf?=?new?HashMap();

//設置最大連接數

pool_conf.put("maxPoolSize",?10);

ds_pooled?=?DataSources.pooledDataSource(ds_unpooled,

pool_conf);

}?catch?(FileNotFoundException?e)?{

e.printStackTrace();

}?catch?(IOException?e)?{

e.printStackTrace();

}?catch?(ClassNotFoundException?e)?{

e.printStackTrace();

}?catch?(SQLException?e)?{

e.printStackTrace();

}

}

/**

*??獲取連接對象

*/

public?static?Connection?getConnection()?throws?SQLException?{

//?2.?設置連接的url,username,pwd

//??????return?DriverManager.getConnection(url,?username,?pwd);

return?ds_pooled.getConnection();

}

/**

*?釋放連接池資源

*/

public?static?void?clearup(){

if(ds_pooled?!=?null){

try?{

DataSources.destroy(ds_pooled);

}?catch?(SQLException?e)?{

e.printStackTrace();

}

}

}

/**

*?資源關閉

*

*?@param?rs

*?@param?stmt

*?@param?conn

*/

public?static?void?close(ResultSet?rs,?Statement?stmt

,?Connection?conn)?{

if?(rs?!=?null)?{

try?{

rs.close();

}?catch?(SQLException?e)?{

e.printStackTrace();

}

}

if?(stmt?!=?null)?{

try?{

stmt.close();

}?catch?(SQLException?e)?{

e.printStackTrace();

}

}

if?(conn?!=?null)?{

try?{

conn.close();

}?catch?(SQLException?e)?{

e.printStackTrace();

}

}

}

}

總結

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