spring return json data to the front-end considerations

1.

Remember to join SpringJSON analytical package, otherwise the spring can not be returned pojo class of analytic data into json

plus the following maven dependencies

<!--    SpringJSON解析包-->
    <jackson.version>2.9.9</jackson.version>
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<dependency> 
  <the groupId> com.fasterxml.jackson.core </ the groupId> 
  <the artifactId> Jackson-DataBind </ the artifactId> 
  <Version> jackson.version $ {} </ Version> 
</ dependency>

 2. 
remember the data type changed

dataType: 'json',

Otherwise, only the return data to identify a string, can not get attribute parameters data.xxx