将Jackson从2.0.4升级到2.7.1

Question

我正在尝试升级我的项目以使用更新版本的Jackson，并遇到了使用自定义串行器和反序列化器的障碍。

关于下面的解串器我得到一个构造函数问题 - 我不知道我应该传入什么类型。我使用的构造函数不再可用。以下是当前班级：

import com.fasterxml.jackson.databind.DeserializationContext; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.deser.std.StdKeyDeserializer;

公共类SifMapKeyDeserializer扩展StdKeyDeserializer {

protected SifMapKeyDeserializer(Class<?> cls) { 
    super(cls); //IT COMPLAINS. It needs a type, not sure what type? 
} 

@Override 
protected Object _parse(String key, DeserializationContext ctxt) 
     throws Exception { 
    ObjectMapper jacksonMapper = ObjectMapperFactory.getObjectMapper(); 
    JsonNode element = jacksonMapper.readTree(key); 

    String fullClassName = element.path(JacksonExtConstants.JAVA_CLASS_NAME_KEY).asText(); 
    String nodeText = element.toString(); 
    Object result = null; 
    try { 
     result = jacksonMapper.readValue(nodeText, Class.forName(fullClassName)); 
    } catch (ClassNotFoundException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    return result; 
} 

}

编辑我发现这个解决上述问题。

public SifMapKeyDeserializer(Class<?> cls) { 
    super(StdKeyDeserializer.TYPE_CLASS, cls); 
} 

解串器列在下面。我遇到了注释方法和SimpleBeanPropertyDefinition的问题 - 我不确定如何解决这些问题。

import java.lang.reflect.Method; 
import java.util.List; 

import com.fasterxml.jackson.databind.BeanDescription; 
import com.fasterxml.jackson.databind.SerializationConfig; 
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod; 
import com.fasterxml.jackson.databind.introspect.AnnotationMap; 
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition; 
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter; 
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier; 
import com.fasterxml.jackson.databind.type.SimpleType; 
import com.fasterxml.jackson.databind.util.SimpleBeanPropertyDefinition; 


/** 
* This custom bean serializer is to allow us add/delete any properties. 
* For example for each deserialized bean we are currently adding its fully 
* qualified class name. 
* 
*/ 
public class SifBeanSerializerModifier extends BeanSerializerModifier { 
    public List<BeanPropertyWriter> changeProperties(SerializationConfig config, 
      BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties) { 

      Class cc = beanDesc.getType().getRawClass();  
      Method m; 
      try { 
       m = cc.getMethod("getClass", null); 
       AnnotatedMethod am = new AnnotatedMethod(m, _emptyAnnotationMap(), null); 
       BeanPropertyDefinition propDef = new SimpleBeanPropertyDefinition(am, JacksonExtConstants.JAVA_CLASS_NAME_KEY); 
       BeanPropertyWriter beanPropWriter = new BeanPropertyWriter(propDef, 
          am, null, 
          SimpleType.constructUnsafe(Class.class), 
          null, null, SimpleType.constructUnsafe(Class.class), 
          true, null); 

       beanProperties.add(beanPropWriter); 
      } catch (SecurityException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } catch (NoSuchMethodException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      }  
     return beanProperties; 
    } 


    private AnnotationMap _emptyAnnotationMap() { 
     return new AnnotationMap(); 
    } 
} 

任何帮助将不胜感激。

感谢

Answer 1

我能解决这个问题这样的：

public class SifBeanSerializerModifier extends BeanSerializerModifier { 
public List<BeanPropertyWriter> changeProperties(SerializationConfig config, 
     BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties) { 

     Class cc = beanDesc.getType().getRawClass();  
     Method m; 
     try { 
      m = cc.getMethod("getClass", null); 
      TypeResolutionContext.Basic tb = new TypeResolutionContext.Basic(TypeFactory.defaultInstance(), TypeBindings.emptyBindings()); 
      AnnotatedMethod am = new AnnotatedMethod(tb, m, _emptyAnnotationMap(), null); 
      BeanPropertyDefinition propDef = SimpleBeanPropertyDefinition.construct(config, am, JacksonExtConstants.JAVA_CLASS_NAME_KEY); 
      BeanPropertyWriter beanPropWriter = new BeanPropertyWriter(propDef, 
         am, null, 
         SimpleType.constructUnsafe(Class.class), 
         null, null, SimpleType.constructUnsafe(Class.class), 
         true, null); 

      beanProperties.add(beanPropWriter); 
     } catch (SecurityException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (NoSuchMethodException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     }  
    return beanProperties; 
} 


private AnnotationMap _emptyAnnotationMap() { 
    return new AnnotationMap(); 
} 

}