數據源DBCP的使用

一、給項目中導jar包

在WEB-INF/lib中導入commons-dbcp.jar、commons.pool-1.5.3.jar、classes12.jar包

二、在src下創建*.properties文件

在文件中寫

username=scott
password=123456
url=jdbc:oracle:thin:@localhost:1521:orcl
driverClass=oracle.jdbc.driver.OracleDriver
maxActive=100
maxWait=20

username=scott
password=123456
url=jdbc:oracle:thin:@localhost:1521:orcl
driverClass=oracle.jdbc.driver.OracleDriver
maxActive=100
maxWait=20

等屬性

三、創建DBUtil.java幫助類

public class DBUtil {

    public static Connection getconn() {
        ResourceBundle bundle = ResourceBundle.getBundle(”dbcp”);// 文件名.properties
        String username = bundle.getString(”username”);
        String password = bundle.getString(”password”);
        String url = bundle.getString(”url”);
        String driverClass = bundle.getString(”driverClass”);
        int maxActive = Integer.parseInt(bundle.getString(“maxActive”));
        int maxWait = Integer.parseInt(bundle.getString(“maxWait”));

        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        dataSource.setDriverClassName(driverClass);
        dataSource.setMaxActive(maxActive);
        dataSource.setUrl(url);
        dataSource.setMaxIdle(20);
        dataSource.setMaxWait(maxWait);

        try {
            Connection connection = dataSource.getConnection();
            return connection;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}

public class DBUtil {

    public static Connection getconn() {
        ResourceBundle bundle = ResourceBundle.getBundle("dbcp");// 文件名.properties
        String username = bundle.getString("username");
        String password = bundle.getString("password");
        String url = bundle.getString("url");
        String driverClass = bundle.getString("driverClass");
        int maxActive = Integer.parseInt(bundle.getString("maxActive"));
        int maxWait = Integer.parseInt(bundle.getString("maxWait"));

        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        dataSource.setDriverClassName(driverClass);
        dataSource.setMaxActive(maxActive);
        dataSource.setUrl(url);
        dataSource.setMaxIdle(20);
        dataSource.setMaxWait(maxWait);

        try {
            Connection connection = dataSource.getConnection();
            return connection;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}

這些都完成後，這前臺顯示就OK！是不是挺簡單的呢！

<%
        Connection conn = DBUtil.getconn();
     %>
     <h1><%=conn %></h1>

<%
        Connection conn = DBUtil.getconn();
     %>
     <h1><%=conn %></h1>