在java中創建可配置對象庫的最佳方式是什麼？

Question

爲了解釋更多，我想要的是根據客戶端服務器拱門中的一些參數識別傳入請求。假設我在服務器上收到一個請求，其中有一些參數，如command=xyz，param1=blah,param2=blah2。

some.property.xyz=com.domain.BusinessFunction1 some.property.abc=com.domain.BusinessFunction2

現在確定這些參數，並且在看配置後，我應該能夠調用正確的業務功能，如在上面的例子中，如果我接收到在哪個命令參數是xyz的請求，它應該通過BusinessFunction1其他如果它是abc它應該通過BusinessFunction2。而BusinessFunction1和BusinessFunction2在兩個不同的Java類中實現。

Answer 1

您最好的方法是創建一個單一工廠，您可以根據服務名稱some.property.xyz存儲的數據庫com.domain.BusinessFunction1填充該工廠。工廠將使用反射來構建類，使用Class.forName("com.domain.BusinessFunction1");然後您可以調用此類上的一個方法，該方法易於使用，以獲取屬性名稱和值的映射。就我個人而言，我會創建另一個工廠，併爲每個業務功能具有特定對象。如果您沒有數據庫，則可以將業務功能的名稱值存儲在XML或枚舉中。

這是使用Singleton和HashMap的想法。我建議你從數據庫填充工廠，以提供更大的靈活性。

的通用基接口

public interface IBusinessFunction { 
    public void doFunction(); 
    public void setParameters(Map<String,String> paramMap); 
} 

業務功能

public class BusinessFunction1 implements IBusinessFunction { 
    @Override 
    public void doFunction() { 
     System.out.println(String.format("Function from business class %s called.", this.getClass().getName())); 
    } 

    @Override 
    public void setParameters(Map<String, String> paramMap) { 

    } 
} 


public class BusinessFunction2 implements IBusinessFunction { 
    @Override 
    public void doFunction() { 
     System.out.println(String.format("Function from business class %s called.", this.getClass().getName())); 
    } 

    @Override 
    public void setParameters(Map<String, String> paramMap) { 

    } 
} 

BusinessFactory

public class BusinessFactory { 
    private static BusinessFactory instance = null; 
    private Map<String, Class<? extends IBusinessFunction>> businessFunctionMap = null; 

    protected BusinessFactory() { 
     // Populate this from a database, 
     // for the ease of your example i will use a HashMap 
     businessFunctionMap = new HashMap<String, Class<? extends IBusinessFunction>>(); 
     businessFunctionMap.put("some.property.xyz", BusinessFunction1.class); 
     businessFunctionMap.put("some.property.abc", BusinessFunction2.class); 
    } 

    public static BusinessFactory getInstance() { 
     if (instance == null) { 
      instance = new BusinessFactory(); 
     } 
     return instance; 
    } 

    public IBusinessFunction getBusinessFunction(String property) { 
     IBusinessFunction businessFunction = null; 
     Class clazz = businessFunctionMap.get(property); 
     try { 
      Constructor constructor = clazz.getConstructor(); 
      businessFunction = (IBusinessFunction) constructor.newInstance(); 
     } catch (NoSuchMethodException e) { 
      e.printStackTrace(); 
     } catch (InvocationTargetException e) { 
      e.printStackTrace(); 
     } catch (InstantiationException e) { 
      e.printStackTrace(); 
     } catch (IllegalAccessException e) { 
      e.printStackTrace(); 
     } 
     return businessFunction; 
    } 
} 

測試類和工廠

public class Example { 
    public static void main(String[] args) { 
     Map<String,String> parameters = new HashMap<String, String>(); 
     parameters.put("Param1","param 1 value"); 
     parameters.put("Param2","param 2 value"); 

     IBusinessFunction businessFunction = BusinessFactory.getInstance().getBusinessFunction("some.property.abc"); 
     businessFunction.setParameters(parameters); 
     businessFunction.doFunction(); 
    } 
}