servlet中怎样加载配置文件以及读取配置文件的值

加载配置文件以及读取配置文件的值

1.加载配置文件代码如下：

package eduask;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Properties;
 public class LoadProperties {
 static InputStream is=null;
 static Properties prop=null;
 static{
 //is=LoadProperties.class.getResourceAsStream("db.properties");
 is=LoadProperties.class.getClassLoader().getResourceAsStream("db.properties");
 prop=new Properties();
 try {
 prop.load(is);
 } catch (IOException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 }
 }

2.从配置文件中读取属性值，代码如下：

package eduask;
 import java.io.FileInputStream;
 import java.io.InputStream;
 import java.util.Properties;
 public class TestServletJdbc {
 static Properties prop=null;
 static FileInputStream fis=null;
 public static void main(String[] args)throws Exception {
 prop=new Properties();
 fis=new FileInputStream("db.properties");
 prop.load(fis);
 System.out.println(prop.getProperty("driverName"));
 System.out.println(prop.getProperty("userName"));
 System.out.println(prop.getProperty("passWord"));
 System.out.println(prop.getProperty("url"));
 }
 }

3.db.properties配置文件，配置结果如下：

driverName=oracle.jdbc.driver.OracleDriver;
 userName=scott;
 passWord=tiger;
 url=jdbc:Oracle:thin:@localhost:1521/orcl;

4.程序运行结果为：

oracle.jdbc.driver.OracleDriver;
 scott;
 tiger;
 jdbc:Oracle:thin:@localhost:1521/orcl