java 读取配置文件properties-优快云博客

本文链接：https://blog.youkuaiyun.com/SkunkLuck/article/details/5800803

本文介绍如何使用Java语言通过加载配置文件连接数据库，包括关键步骤和常见异常处理。

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package com.lp.utils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

public class LinkDB {
private Connection conn;
private String userName;
private String userPwd;
private String driver;
private String uRL;

public LinkDB() {
  try {
   InputStream in = LinkDB.class.getClassLoader().getResourceAsStream("database.properties");
   Properties p = new Properties();
   p.load(in);
   userName = p.getProperty("userName");
   userPwd = p.getProperty("userPwd");
   driver = p.getProperty("driver");
   uRL = p.getProperty("uRL");

  } catch (FileNotFoundException e) {
   System.out.println("系统找不到指定的文件。");
   e.printStackTrace();
  } catch (IOException e) {
   System.out.println("文件加载失败");
   e.printStackTrace();
  }
}

public Connection getConn() {
  try {
   Class.forName(driver);
   conn = DriverManager.getConnection(uRL, userName, userPwd);
   System.out.println("连接成功");
  } catch (ClassNotFoundException e) {
   System.out.println("驱动加载失败");
   e.printStackTrace();
  } catch (SQLException e) {
   System.out.println("连接数据库失败");
   e.printStackTrace();
  }
  return conn;
}
}