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POWhat is the easiest way to parse json using gson when the element to parse is an element of a json string?
 

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  1. POWhat is the easiest way to parse json using gson when the element to parse is an element of a json string?
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    <p>I am using gson to parse json into java beans. For the API I am using, a large number of the json results include the result as the first property of a json object. The "gson way" seems to be to create an equivalent wrapper java object, which has one property for the target output type - but this results in unnecessary throwaway classes. Is there a best practice way of doing this?</p> <p>For example to parse: <code>{"profile":{"username":"nickstreet","first_name":"Nick","last_name":"Street"}}</code></p> <p>I have to do:</p> <pre><code>public class ParseProfile extends TestCase { public void testParseProfile() { Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create(); String profileJson = "{\"profile\":{\"username\":\"nickstreet\",\"first_name\":\"Nick\",\"last_name\":\"Street\"}}"; ProfileContainer profileContainer = gson.fromJson(profileJson, ProfileContainer.class); Profile profile = profileContainer.getProfile(); assertEquals("nickstreet", profile.username); assertEquals("Nick", profile.firstName); assertEquals("Street", profile.lastName); } } public class ProfileContainer { protected Profile profile; public Profile getProfile() { return profile; } public void setProfile(Profile profile) { this.profile = profile; } } public class Profile { protected String username; protected String firstName; protected String lastName; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } } </code></pre> <p>Of course an alternative approach to using a container would be to manually remove the outer portion of the string (i.e. remove the "profile":{ and closing }) using standard string parsing techniques, but this feels like the wrong approach.</p> <p>I would like to be able to do something like:</p> <pre><code>Profile p = gson.fromJsonProperty(json, Profile.class, "profile"); </code></pre> <p><a href="http://code.google.com/p/google-gson/issues/detail?id=110" rel="noreferrer">This issue</a> suggests it should be possible to break a json string up into a json object, to pull out a jsonElement from this object, and pass it into json.fromJson(). However, the toJsonElement() method only works on a java object, not a json string.</p> <p>Does anyone have a better approach?</p>
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