Java 读取、获取配置文件.properties中的数据

java获取配置文件.properties中的数据，具体内容如下所示：

方法太多，只写一种比较简单的。

文件test1.properties内容

test1 = 123;
test2=3211
    Properties prop = new Properties();
    prop.load(new FileInputStream("src/test1.properties"));
    System.out.println(prop.get("test1"));

输出

123;1

简单封装一下，完整代码

package propertis.test;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;
public class Test {
  /**
   * @param args
   * @throws IOException
   * @throws FileNotFoundException
   */
  public static void main(String[] args) throws FileNotFoundException, IOException {
    // TODO Auto-generated method stub
    Properties prop = new Properties();
    prop.load(new FileInputStream("src/test1.properties"));
    System.out.println(prop.get("test1"));
    System.out.println(ProUtil.getTest1Value("test1"));
    System.out.println(ProUtil.getTest1Value("test2"));
  }
}
class ProUtil{
  private static Properties prop = new Properties();
  static{
    try {
      prop.load(new FileInputStream("src/test1.properties"));
    } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
  public static Object getTest1Value(String key){
    return prop.get(key);
  }
}

输出

123;
123;
321

下面看下Java 读取Properties配置文件

方法：

Properties properties = new Properties();
FileInputStream in = new FileInputStream("**.properties");
properties.load(in);
in.close();

配置文件：

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
username=root
password=

代码实现：

import java.io.FileInputStream;
import java.util.Properties;
public class PropertiesTest {
 private static final String PROPERTIES_NAME = "db.properties";
 public static String DB_DRIVER = null;
 public static String DB_URL = null;
 public static String DB_USER = null;
 public static String DB_PWD = null;

 static{
 FileInputStream in = null;
 try{
  Properties properties = new Properties();
  in = new FileInputStream(PROPERTIES_NAME);
  properties.load(in);
  DB_DRIVER = properties.getProperty("driver");
  DB_URL = properties.getProperty("url");
  DB_USER = properties.getProperty("username");
  DB_PWD = properties.getProperty("passworld");
  System.out.println("读取配置信息成功！");
  showConfig();
 }catch(Exception e){
  e.printStackTrace();
  System.out.println("读取配置信息失败！");
 }finally{
  if(in != null){
  try{
   in.close();
  }catch(Exception e){
   e.printStackTrace();
  }
  }
 }
 }

 private static void showConfig(){
 System.out.println("-----------------------配置信息-----------------");
 System.out.println("dirver: "+DB_DRIVER);
 System.out.println("url: "+DB_URL);
 System.out.println("user: "+DB_USER);
 System.out.println("passworld: "+DB_PWD);
 System.out.println("----------------------------------------------");
 }

 public static void main(String[] args){

 }
}

运行结果：

读取配置信息成功！

-----------------------配置信息-----------------
dirver: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
user: root
passworld: null
----------------------------------------------

总结

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