spring4解决json返回null值为“null”字符串问题

pom.xml

 

            com.fasterxml.jackson.core
            jackson-core
            2.0.4
        
        
            com.fasterxml.jackson.core
            jackson-databind
            2.0.4
        

 

 

代码：

 

public class CustomerObjectMapper extends ObjectMapper {
 
    {
        DefaultSerializerProvider.Impl sp = new DefaultSerializerProvider.Impl();
        sp.setNullValueSerializer(new NullSerializer());
        this.setSerializerProvider(sp);
    }
 
    public class NullSerializer extends JsonSerializer