Converting JSON to XLS CSV in Java

Question

Does anyone have any sample Java code to convert a JSON document to XLS CSV file  I have tried to search on Google but to no avail

User · Answer

you can use commons csv to convert into CSV format. or use POI to convert into xls. if you need helper to convert into xls, you can use jxls, it can convert java bean (or list) into excel with expression language.

Basically, the json doc maybe is a json array, right? so it will be same. the result will be list, and you just write the property that you want to display in excel format that will be read by jxls. See http://jxls.sourceforge.net/reference/collections.html

If the problem is the json can't be read in the jxls excel property, just serialize it into collection of java bean first.

User · Answer

You could only convert a JSON array into a CSV file   Lets say  you have a JSON like the following      infile      field1   11  field2   12  field3   13                 field1   21  field2   22  field3   23                 field1   31  field2   32  field3   33      Lets see the code for converting it to csv    import java io File  import java io IOException   import org apache commons io FileUtils  import org json CDL  import org json JSONArray  import org json JSONException  import org json JSONObject   public class JSON2CSV       public static void main String myHelpers             String jsonString       infile        field1    11   field2    12   field3    13     field1    21   field2    22   field3    23     field1    31   field2    32   field3    33               JSONObject output          try               output   new JSONObject jsonString                 JSONArray docs   output getJSONArray  infile                 File file new File   tmp2 fromJSON csv                String csv   CDL toString docs               FileUtils writeStringToFile file  csv             catch  JSONException e                e printStackTrace              catch  IOException e                   TODO Auto-generated catch block             e printStackTrace                                 Now you got the CSV generated from JSON   It should look like this   field1 field2 field3 11 22 33 21 22 23 31 32 33   The maven dependency was like    lt dependency gt       lt groupId gt org json lt  groupId gt       lt artifactId gt json lt  artifactId gt       lt version gt 20090211 lt  version gt   lt  dependency gt    Update Dec 13  2019   Updating the answer  since now we can support complex JSON Arrays as well   import java nio file Files  import java nio file Paths   import com github opendevl JFlat   public class FlattenJson        public static void main String   args  throws Exception           String str   new String Files readAllBytes Paths get  path to imput json               JFlat flatMe   new JFlat str              get the 2D representation of JSON document         flatMe json2Sheet   headerSeparator      getJsonAsSheet               write the 2D representation in csv format         flatMe write2csv  path to output csv               dependency and docs details are in link

User · Answer

A JSON document basically consists of lists and dictionaries  There is no obvious way to map such a datastructure on a two-dimensional table

[java] Converting JSON to XLS/CSV in Java

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