配置文件.properties/.ini类型文件管理

最新推荐文章于 2023-01-29 19:58:07 发布

原创最新推荐文章于 2023-01-29 19:58:07 发布 · 582 阅读

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文章标签：

#ini #INI #io #IO #Io #java #Java #JAVA #properties #Properties

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本文介绍了一个Java程序如何使用Properties类来读取和写入配置文件的具体实现方法。包括创建配置文件、根据键获取值、保存配置等功能，并通过实例演示了整个流程。

package com.sf.oracle.lesson03;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

public class TestProperies {

//properties与ini文件存储方式[key=value]、操作方法基本上没差，唯一的不同在于：当文件中Key值出现重复时，ini处理面的key，properties处理最后一个key

   static File file = new File("./data/config.properties");
   static FileInputStream fileInputStream = null;
   static FileOutputStream fileOutputStream = null;
   static Properties properties = null;
   static {
       if (!file.exists()) {
           try {
               file.createNewFile();
           } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       try {
           fileInputStream = new FileInputStream(file);
           properties = new Properties();
           properties.load(fileInputStream);
       } catch (FileNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

   }

   /**
   * 通过Key去获取value
   *
   * @param key
   * @param defaultValue
   * @return
   */

public static String getProperty(String key, String defaultValue) {

//通过key获取value，如果key不存在返回默认值defaultValue

       String value = properties.getProperty(key, defaultValue);
       return value;
   }

   /**
   * 保存配置
   *
   * @param key
   * @param value
   */
   public static void setProperty(String key, String value) {
       // key如果原来没有，新建
       // 如果原来有，修改其对应的值
       properties.setProperty(key, value);
       try {
           fileOutputStream = new FileOutputStream(file);
           properties.store(fileOutputStream, "QQ config info");
       } catch (FileNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } finally {
           try {
               fileOutputStream.close();
           } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }

   }

   /**
   * @param args
   */
   public static void main(String[] args) {
       String url = TestProperies.getProperty("url",
               "jdbc:oracle:thin:@127.0.0.1:1521:orcl");
       String user = TestProperies.getProperty("user", "oracle1103");
       String password = TestProperies.getProperty("password", "888888");
       String driver = TestProperies.getProperty("driver",
               "oracle.jdbc.driver.OracleDriver");
       String port = TestProperies.getProperty("port", "8099");

       System.out.println("user:" + user);
       System.out.println("password:" + password);

       TestProperies.setProperty("url",
               "jdbc:oracle:thin:@127.0.0.1:1521:orcl");
       TestProperies.setProperty("user", "1111111111111111");
       TestProperies.setProperty("password", "2222222222222");
       user = TestProperies.getProperty("user", "oracle1103");
       password = TestProperies.getProperty("password", "888888");

       System.out.println("user:" + user);
       System.out.println("password:" + password);

   }

}