java - Replace whitespace in JSON keys -


i thinking of best solution replace whitespaces in json keys underscore. 

{    "format": "json",    "testdata": {      "key spaces in it": {        "and again": {          "child_key1": "financial",          "child_key2": null        },  .........  .....

i want above converted shown below:

{    "format": "json",    "testdata": {      "key_with_spaces_in_it": {        "and_again": {          "child_key1": "financial",          "child_key2": null        },  .........  .....

any suggestions ?

does java library have predefined function ?

replacing keys

the following code uses google's json parser extract keys, reformat them, , create new json object:

public static void main(string[] args) {     string testjson = "{\"testkey\": \"test\", \"test spaces\": { \"child spaces 1\": \"child value 1\", \"child spaces 2\": \"child value 2\" } }";     map oldjsonobject = new gson().fromjson(testjson, map.class);     jsonobject newjsonobject = iteratejson(oldjsonobject);      gson somegson = new gson();     string outputjson = somegson.tojson(newjsonobject);     system.out.println(outputjson); }  private static jsonobject iteratejson(map jsondata) {     jsonobject newjsonobject = new jsonobject();     set jsonkeys = jsondata.keyset();     iterator<?> keys = jsonkeys.iterator();     while(keys.hasnext()) {         string currentkey = (string) keys.next();         string newkey = currentkey.replaceall(" ", "_");         if (jsondata.get(currentkey) instanceof map) {             jsonobject currentvalue = iteratejson((map) jsondata.get(currentkey));             newjsonobject.add(currentkey, currentvalue);         } else {             string currentvalue = (string) jsondata.get(currentkey);             newjsonobject.addproperty(newkey, currentvalue);         }     }     return newjsonobject; }

you can read more gson here.

replacing values

depending on how json data set up, might need switch jsonarray jsonobject.

jsonarrays begin , end [], while jsonobjects begin , end {}

in short, these methods travel on entire array/object , replace spaces underscores. they're recursive, dive child jsonarrays/jsonobjects.

if json data encoded java jsonarray, can following:

public static void removejsonspaces(jsonarray thejson) {     (int = 0; while < thejson.length(); i++) {         if (thejson.get(i) instanceof jsonarray) {             currentjsonarray = thejson.getjsonarray(i);             removejsonspaces(currentjsonarray);         } else {             currententry = thejson.getstring(i);             fixedentry = currententry.replace(" ", "_");             currentjsonarray.put(i, fixedentry);         }     } }

in short, method travel on entire array , replace spaces underscores. it's recursive, dive child jsonarrays.

you can read more jsonarrays here

if data encoded jsonobject, you'd want like:

public static void removejsonspaces(jsonobject thejson) {      jobject = new jsonobject(thejson.trim());     iterator<?> keys = jobject.keys();      while(keys.hasnext()) {         string key = (string)keys.next();         if (jobject.get(key) instanceof jsonobject) {             removejsonspaces(jobject.get(key))         } else {             currententry = thejson.getstring(i);             fixedentry = currententry.replace(" ", "_");             currentjsonarray.put(i, fixedentry);         }     }  }

you can read more jsonobjects here


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