Web读取配置文件得到数据库连接(转JavaEye 青春飞扬)

最新推荐文章于 2025-12-15 21:10:21 发布

转载最新推荐文章于 2025-12-15 21:10:21 发布 · 2.7k 阅读

文章标签：

#数据库 #web #import #string #properties #stylesheet

本文介绍了一种在Java Web应用中通过读取配置文件来获取数据库连接信息的方法，并解决了路径问题。通过具体代码示例展示了如何实现这一过程。

Web读取配置文件得到数据库连接关键字: java 虽然用Java测试过，通过读取配置文件来得到数据库的连接字符串成功了，但是使用Web的时候，还是碰到了路径问题，经过调试，终于找到了规律。 database.properties Java代码 jdbc.drivers=oracle.jdbc.driver.OracleDriver jdbc.url=jdbc:oracle:thin:@localhost:1521:ORCL jdbc.username=scott jdbc.password=tiger DatabaseUtil Java代码 package com.util; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.util.Properties; import oracle.sql.CLOB; public class DatabaseUtil { private static DatabaseUtil dbUtil; private String drivers; private String url; private String username; private String password; //加反斜线就表示在默认包目录，不加则表示在与当前类同路径去查找该属性文件 private static String FILE_PATH_NAME = "/database.properties"; private void init() { try { InputStream in = getClass().getResourceAsStream(FILE_PATH_NAME); Properties props = new Properties(); props.load(in); in.close(); drivers = props.getProperty("jdbc.drivers"); url = props.getProperty("jdbc.url"); username = props.getProperty("jdbc.username"); password = props.getProperty("jdbc.password"); } catch (IOException e) { e.printStackTrace(); } } private DatabaseUtil() { init(); } public static DatabaseUtil getInstance() { if(dbUtil == null) { dbUtil = new DatabaseUtil(); } return dbUtil; } public Connection getConnection() { Connection conn = null; try { Class.forName(drivers); conn = DriverManager.getConnection(url, username, password); } catch (SQLException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } return conn; } } 路径问题已经做了注释，在这里就不多讲了。现在写一个测试页面。 connTest.jsp Java代码 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <jsp:directive.page import="com.util.DatabaseUtil"/> <jsp:directive.page import="java.sql.Connection"/> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'connTest.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page">  </head> <body> <% DatabaseUtil dbUtil = DatabaseUtil.getInstance(); Connection conn = dbUtil.getConnection(); out.println(conn); out.println("获取连接成功！"); %> </body> </html>