propertiesfile

config.properties放在根目录。

 

写文件：

package com.mkyong.common;
 
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
 
public class App 
{
    public static void main( String[] args )
    {
    	Properties prop = new Properties();
 
    	try {
    		//set the properties value
    		prop.setProperty("database", "localhost");
    		prop.setProperty("dbuser", "mkyong");
    		prop.setProperty("dbpassword", "password");
 
    		//save properties to project root folder
    		prop.store(new FileOutputStream("config.properties"), null);
 
    	} catch (IOException ex) {
    		ex.printStackTrace();
        }
    }
}

 

读文件：

package com.mkyong.common;
 
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
 
public class App 
{
    public static void main( String[] args )
    {
    	Properties prop = new Properties();
 
    	try {
               //load a properties file
    		prop.load(new FileInputStream("config.properties"));
 
               //get the property value and print it out
                System.out.println(prop.getProperty("database"));
    		System.out.println(prop.getProperty("dbuser"));
    		System.out.println(prop.getProperty("dbpassword"));
 
    	} catch (IOException ex) {
    		ex.printStackTrace();
        }
 
    }
}