java - How to convert String to Json -


i have servlet in java , know how can following.

i have string variable value of name , want create json variable being {"name": "david"}.

how do this?

i have following code error :

   serious: servlet.service () servlet threw     exception servlet.usuarioservlet java.lang.nullpointerexception                 @ servlet.usuarioservlet.dopost (usuarioservlet.java: 166):

at line 

string mystring = new jsonobject().put("name", "hello, world!").tostring();

your exact problem described chandra. , may use jsonobject using suggestion. see, designers hadn't in mind properties, chaining, made success of other languages or libs.

i'd suggest use google gson one. makes both decoding , encoding easy :

the idea may define class example :

public class myclass {    public string name = "hello, world!"; }  private gson gson = new gsonbuilder().create(); printwriter writer = httpservletresponse.getwriter(); writer.write( gson.tojson(yourobject));

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