JsonWriter

public final class JsonWriter
extends Object implements Closeable

Writes a JSON (RFC 4627) encoded value to a stream, one token at a time. The stream includes both literal values (strings, numbers, booleans and nulls) as well as the begin and end delimiters of objects and arrays.

Encoding JSON

• To write arrays, first call beginArray(). Write each of the array's elements with the appropriate value(boolean) methods or by nesting other arrays and objects. Finally close the array using endArray().
• To write objects, first call beginObject(). Write each of the object's properties by alternating calls to name(String) with the property's value. Write property values with the appropriate value(boolean) method or by nesting other objects or arrays. Finally close the object using endObject().

Example

 [
   {
     "id": 912345678901,
     "text": "How do I write JSON on Android?",
     "geo": null,
     "user": {
       "name": "android_newb",
       "followers_count": 41
      }
   },
   {
     "id": 912345678902,
     "text": "@android_newb just use android.util.JsonWriter!",
     "geo": [50.454722, -104.606667],
     "user": {
       "name": "jesse",
       "followers_count": 2
     }
   }
 ]

   public void writeJsonStream(OutputStream out, List<Message> messages) throws IOException {
     JsonWriter writer = new JsonWriter(new OutputStreamWriter(out, "UTF-8"));
     writer.setIndent("  ");
     writeMessagesArray(writer, messages);
     writer.close();
   }

   public void writeMessagesArray(JsonWriter writer, List<Message> messages) throws IOException {
     writer.beginArray();
     for (Message message : messages) {
       writeMessage(writer, message);
     }
     writer.endArray();
   }

   public void writeMessage(JsonWriter writer, Message message) throws IOException {
     writer.beginObject();
     writer.name("id").value(message.getId());
     writer.name("text").value(message.getText());
     if (message.getGeo() != null) {
       writer.name("geo");
       writeDoublesArray(writer, message.getGeo());
     } else {
       writer.name("geo").nullValue();
     }
     writer.name("user");
     writeUser(writer, message.getUser());
     writer.endObject();
   }

   public void writeUser(JsonWriter writer, User user) throws IOException {
     writer.beginObject();
     writer.name("name").value(user.getName());
     writer.name("followers_count").value(user.getFollowersCount());
     writer.endObject();
   }

   public void writeDoublesArray(JsonWriter writer, List<Double> doubles) throws IOException {
     writer.beginArray();
     for (Double value : doubles) {
       writer.value(value);
     }
     writer.endArray();
   }

Each JsonWriter may be used to write a single JSON stream. Instances of this class are not thread safe. Calls that would result in a malformed JSON string will fail with an IllegalStateException.

Summary

Public constructors

public JsonWriter (Writer out)

Public methods

public JsonWriter beginArray ()

public JsonWriter beginObject ()

public void close ()

public JsonWriter endArray ()

public JsonWriter endObject ()

public void flush ()

public boolean isLenient ()

public JsonWriter name (String name)

public JsonWriter nullValue ()

public void setIndent (String indent)

public void setLenient (boolean lenient)

public JsonWriter value (double value)

public JsonWriter value (Number value)

public JsonWriter value (boolean value)

public JsonWriter value (long value)

public JsonWriter value (String value)