java applacation中的属性文件读取

最新推荐文章于 2024-10-02 06:15:55 发布

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最新推荐文章于 2024-10-02 06:15:55 发布

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分类专栏： j2ee 文章标签： java string properties constants file url

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本文介绍了一个Java项目的配置文件加载方式及如何通过这些配置建立数据库连接。具体包括使用Properties类读取配置文件中的数据库参数，并在Constants类中进行初始化，以及利用这些参数在DBHelper类中实现数据库连接。

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项目目录：

+--bin

+--src

+--cn

+--yutel

+--Constants.java

+--tt.properties

+--lib

项目文件：tt.properties

database.drivername=oracle.jdbc.driver.OracleDriver database.url=jdbc:oracle:thin:@133.64.46.199:1522:wttest database.username=nbstest database.password=nbstest bonus.one=50 bonus.fifty=1

文件：Constants.java

import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.Serializable; import java.net.URL; import java.net.URLDecoder; import java.util.Properties; public class Constants implements Serializable { private static final long serialVersionUID = -6463130962199750141L; //配置文件 public final static String DB_DRIVERNAME = "database.drivername"; public final static String DB_URL = "database.url"; public final static String DB_USERNAME = "database.username"; public final static String DB_PASSWORD = "database.password"; public final static String BONUS_ONE = "bonus.one"; public final static String BONUS_FIFTY = "bonus.fifty"; //动态值 public static String DbDriverName; public static String DbUrl; public static String DbUsername; public static String DbPassword; public static int BonusOne; public static int BonusFifty; static { try { Properties p = new Properties(); URL url = ClassLoader.getSystemResource(""); String filePath = URLDecoder.decode(url.getPath(), "UTF-8"); File file = new File(filePath + "ttm.properties"); FileInputStream in = new FileInputStream(file); p.load(in); // 从文件中取值 DbDriverName = p.getProperty(DB_DRIVERNAME); DbUrl = p.getProperty(DB_URL); DbUsername = p.getProperty(DB_USERNAME); DbPassword = p.getProperty(DB_PASSWORD); String one = p.getProperty(BONUS_ONE); BonusOne = Integer.parseInt(one); String fifty = p.getProperty(BONUS_FIFTY); BonusFifty = Integer.parseInt(fifty); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }

配置值使用，例如如下：

import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class DBHelper { private static Connection conn; public static Connection getConn() { try { Class.forName(Constants.DbDriverName); } catch (ClassNotFoundException e) { e.printStackTrace(); } try { conn = DriverManager.getConnection(Constants.DbUrl, Constants.DbUsername, Constants.DbPassword); } catch (SQLException e) { e.printStackTrace(); } return conn; } // 关闭数据库连接 public static void closeConn(Connection conn) { if (null != conn) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } // 测试数据库连接 public static void main(String[] args) { Connection conn = getConn(); if (conn != null) { System.out.println("ok"); } else { System.out.print("error"); } } }