Java 应用程序开箱即用的对象持久性

				
public class StockData
{
  private static Log log;
  public static void main(String[] args)
  {
    System.setProperty("log4j.configuration", "file:log4j.properties");
    log = LogFactory.getLog(StockData.class);
    try
    {
      String symbol = args[0];
      String csvFile = args[1];
      String query = args[2];
      // open store, uses HSQLDB driver and memory only database
      Store store = new Store("org.hsqldb.jdbcDriver","jdbc:hsqldb:mem:stockdata");
      // read csv and generate beans
      List historicalData = FileUtils.readLines(new File(csvFile), "UTF-8");
      // remove first line (header)
      historicalData.remove(0);
      // store beans to database
      for (Object _data : historicalData)
      {
        String[] data = ((String) _data).split(",");
        StockBean bean = new StockBean(symbol, data[0],
            Double.parseDouble(data[4]), Double.parseDouble(data[5]));
        //save stock bean to database
        store.save(bean);
      }
      // find beans that match query
      List results=store.find(query);
      // print beans that matched
      System.out.println("Total results: "+results.size());
      for (Object object : results)
      {
        StockBean bean=(StockBean)object;
        System.out.println(bean.toString());
      }
    }
    catch (Exception e)
    {
      log.error(e.getMessage(), e);
      System.out
          .println("Usage: java sample.StockData " +
              "<symbol name> <historical prices file> <query>");
    }
  }
}

				
public class StockBean
{
  private String symbolName = "";
  private String date = null;
  private double price = 0.0;
  private double volume = 0.0;
  public StockBean()
  {
    // no-argument constructor required by Simple Persistence
  }
  public String toString()
  {
    StringBuffer sb=new StringBuffer();
    sb.append(symbolName);
    sb.append(',');
    sb.append(date);
    sb.append(',');
    sb.append(price);
    sb.append(',');
    sb.append(volume);
    return sb.toString();
  }
  public StockBean(String symbolName, String date, double price, double volume)
  {
    this.symbolName = symbolName;
    this.date = date;
    this.price = price;
    this.volume = volume;
  }
  public String getDate()
  {
    return date;
  }
  public void setDate(String date)
  {
    this.date = date;
  }
  public double getPrice()
  {
    return price;
  }
  public void setPrice(double price)
  {
    this.price = price;
  }
  public String getSymbolName()
  {
    return symbolName;
  }
  public void setSymbolName(String symbolName)
  {
    this.symbolName = symbolName;
  }
  public double getVolume()
  {
    return volume;
  }
  public void setVolume(double volume)
  {
    this.volume = volume;
  }
}