Why JSON object printed as String in JSP?

Question

In my Servlet a JSONObject is created with the value:

{'alerts':true}

When I am trying to print its value on JSP page using , it is printing the JSON object as String . It is printed as

 "{'alerts':true}"

How do I print in JSON format rather than String?

In Servlet:

public JSONObject getAudioAlerts() {
    JSONObject val = new JSONObject("{'alerts':true}");
     return val;
}

In JSP:

<br><br><json:property name="audioAlerts" value="${myBean.audioAlerts"}" />;
    <br> Expected output: {'alerts':true}
    <br>Acutal output: "{'alerts':true}"

you can parse your json string to json object like this var jsonObj = JSON.parse(audioAlerts); — Gautam, May 15 '14 at 10:09
@Gautam I don't want to use javascript just to parse this again on JSP page. Included source code in the question. — Siva Krishna Gontla, May 15 '14 at 10:23
i can see method mismatch in jsp("getMailAudioAlertsEnabled") and servlet ("audioAlerts") — Gautam, May 15 '14 at 10:40
I'm not sure , but I think you have to parse the output string into a json object, in javascript. — Reporter, May 15 '14 at 10:52
You should probably do something like : `return val.toJSONString();` and change `public JSONObject` for `public String`. — Alexandre Lavoie, May 15 '14 at 10:53
@AlexandreLavoie The JSONObject class doesn't have a toJSONString() method. — Siva Krishna Gontla, May 15 '14 at 11:02

score 2 · Accepted Answer · answered May 15 '14 at 11:00

2

As per http://json-taglib.sourceforge.net/tutorial.html

By setting the value="..." attribute on the tag. <json:property/>

The same trimming and encoding rules apply as described above.
If the value specified is a Boolean, then it will be converetd to a JSON boolean
If the value specified is a number (Integer, Short, Long, Double, Float) then it will be - -converted to a JSON numeric value.
If the value is a String it will be converted to a JSON string.
Any other Java types that are used to set the value will have toString() called on them and they will be treated as JSON strings.

As per documentation your value is getting converted to Json String

so try to put your <json:property> into <json:object></json:object>

or else you can parse your jSON string in javascript

var jsonObj = JSON.parse(audioAlerts)

answered May 15 '14 at 11:00

Gautam

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i tried to put into . It didn't work. Yes, JSON.parse() will work. But i am keeping that as my last resort. – Siva Krishna Gontla May 15 '14 at 11:08
Tried this . Server is throwing an error. . Server is throwing error – Siva Krishna Gontla May 20 '14 at 07:37
i hope you added this in your code <%@ taglib prefix="json" uri="http://www.atg.com/taglibs/json" %> – Gautam May 20 '14 at 08:59
please use only tag – Gautam May 20 '14 at 09:00
ya, the taglib is included and i tried using with tag embedded in it. – Siva Krishna Gontla May 20 '14 at 09:48

Why JSON object printed as String in JSP?

1 Answers1