Spring 实现给Bean属性注入null值

< bean class = "ExampleBean" >

   < property name = "email" >< value /></ property >

</ bean >

< bean class = "ExampleBean" >

   < property name = "email" >< null /></ property >

</ bean >

@Component ( "countFunction" )

public class CountFunction implements AviatorFunction {   

     @Resource (name = "mongoLogInfoDAO" )

     private MongoLogInfoDAO mongoLogInfoDAO;

     @Override

     public String getName() {

         return "count" ;

     }

AviatorEvaluator.addFunction( new CountFunction());

@Component ( "functionExecutor" )

public class FunctionExecutor {

     protected static final Loggerx LOGGER = Loggerx.getLogger( "system" );

     @Resource (name = "mongoDAO" )

     private MongoDAO mongoDAO;

     @Resource (name = "prism4001Producer" )

     private SmartMQProducer prism4001Producer;

     @Resource (name = "whereGreaterThenFunction" )

     private   WhereGreaterThenFunction whereGreaterThenFunction;

     @Resource (name = "countFunction" )

     private   CountFunction countFunction;

     @Resource (name = "devideFunction" )

     private   DevideFunction devideFunction;

     @Resource (name = "selectFunction" )

     private   SelectFunction selectFunction;

     @Resource (name = "whereEqualFunction" )

     private   WhereEqualFunction whereEqualFunction;

     @Resource (name = "timeFunction" )

     private   TimeFunction timeFunction;

     @Resource (name = "whereLessThenFunction" )

     private   WhereLessThenFunction whereLessThenFunction;

     @Resource (name = "whereGreaterThenEqualFunction" )

     private   WhereGreaterThenEqualFunction whereGreaterThenEqualFunction;

     @Resource (name = "whereInFunction" )

     private   WhereInFunction whereInFunction;

     @Resource (name = "greaterThenFunction" )

     private   GreaterThenFunction greaterThenFunction;

     @Resource (name = "regexFunction" )

     private   RegexFunction regexFunction;

     @Resource (name = "maxFunction" )

     private   MaxFunction maxFunction;

     @Resource (name = "minFunction" )

     private   MinFunction minFunction;

     @Resource (name = "equalFunction" )

     private   EqualFunction equalFunction;

     @Resource (name = "lessThenEqualFunction" )

     private   LessThenEqualFunction lessThenEqualFunction;

     @Resource (name = "lessThenFunction" )

     private   LessThenFunction lessThenFunction;

     @Resource (name = "plusFunction" )

     private   PlusFunction plusFunction;

     @Resource (name = "multiFunction" )

     private   MultiFunction multiFunction;

     @Resource (name = "notEqualFunction" )

     private   NotEqualFunction notEqualFunction;

     @Resource (name = "whereNotInFunction" )

     private   WhereNotInFunction whereNotInFunction;

     @Resource (name = "sumFunction" )

     private   SumFunction sumFunction;

     @Resource (name = "minusFunction" )

     private   MinusFunction minusFunction;

    {

         AviatorEvaluator.addFunction(whereGreaterThenFunction);

         AviatorEvaluator.addFunction(countFunction);

         AviatorEvaluator.addFunction(devideFunction);

         AviatorEvaluator.addFunction(selectFunction);

         AviatorEvaluator.addFunction(whereEqualFunction);

         AviatorEvaluator.addFunction(timeFunction);

         AviatorEvaluator.addFunction(whereLessThenFunction);

         AviatorEvaluator.addFunction(whereGreaterThenEqualFunction);

         AviatorEvaluator.addFunction(whereInFunction);

         AviatorEvaluator.addFunction(greaterThenFunction);

         AviatorEvaluator.addFunction(regexFunction);

         AviatorEvaluator.addFunction(maxFunction);

         AviatorEvaluator.addFunction(minFunction);

         AviatorEvaluator.addFunction(equalFunction);

         AviatorEvaluator.addFunction(lessThenEqualFunction);

         AviatorEvaluator.addFunction(lessThenFunction);

         AviatorEvaluator.addFunction(plusFunction);

         AviatorEvaluator.addFunction(multiFunction);

         AviatorEvaluator.addFunction(notEqualFunction);

         AviatorEvaluator.addFunction(whereNotInFunction);

         AviatorEvaluator.addFunction(sumFunction);

         AviatorEvaluator.addFunction(minusFunction);

     }