[Java]Servelet 存取 properties

需要寫一個PropertyUtils.java 來存取專案中的 config.properties

以下是程式碼

PropertyUtils.java

 

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Properties;

/**
 *
 * @author bert
 */
public class PropertyUtils {
  //  private static final Logger log = LoggerFactory.getLogger(PropertyUtils.class);
    
    public PropertyUtils(){
        
    }
    
    /**
     * 透過Key取得參數
     * @param key
     * @return String
     */
    public  static String getPropert(String key){
        String result = null;
        try {

            Properties prop = new Properties();
            String propFileName = "config.properties";
     
            InputStream is = PropertyUtils.class.getClassLoader().
                    getResourceAsStream(propFileName);
            prop.load(is);
            if (is == null) {
                throw new FileNotFoundException("property file '" + 
                        propFileName +
                        "' not found in the classpath");
            }
     
            Date time = new Date(System.currentTimeMillis());
     
            // get the property value and print it out            
            result = prop.getProperty(key);

            if(is != null){
                is.close();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        return result;
    }
    
    
}

使用方式

 
private final String DB_Name = PropertyUtils.getPropert("db_name");
private final String IP = PropertyUtils.getPropert("db_location");
private final String USER = PropertyUtils.getPropert("db_user");
private final String PSW = PropertyUtils.getPropert("db_password");

config.properties

db_user = dbuser
db_password = abcd1234
db_location=192.168.1.100
db_name=DemoDB