public java.lang.String toString(int indentFactor) throws JSONException
Example
import org.json.*;
public class JSONPrettyPrintTest {
public static void main(String args[]) throws JSONException {
String json = "{" +
"Name : Jai," +
"Age : 25, " +
"Salary: 25000.00 " +
"}";
JSONObject jsonObj = new JSONObject(json);
System.out.println("Pretty Print of JSON:");
System.out.println(jsonObj.toString(4)); // pretty print json
}
}
Output
Pretty Print of JSON:
{
"Salary": 25000,
"Age": 25,
"Name": "Jai"
}
]]>
]]>
https://sites.google.com/site/gson/streaming
http://www.acuriousanimal.com/2015/10/23/reading-json-file-in-stream-mode-with-gson.html
public static void main(String [] args) throws IOException {
String filePath = "C:big-data.json";
FileInputStream in = new FileInputStream(new File(filePath));
JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
Gson gson = new GsonBuilder().create();
// reader.beginObject();
// reader.nextName();
reader.beginObject();//璺寵繃"{"
while (reader.hasNext()) {
// Read data into object model
JsonToken jsonToken = reader.peek();
if(jsonToken.equals(JsonToken.NAME)) {
String name = reader.nextName();
if(name.equalsIgnoreCase("SUMMARY")) {
// reader.beginObject();
Summary summary = gson.fromJson(reader, Summary.class);
logger.info(summary.toString());
break;
// reader.endObject();//璺寵繃"}"
}
} /*else if(jsonToken.equals(JsonToken.BEGIN_OBJECT)) {
reader.beginObject();
} else if(jsonToken.equals(JsonToken.STRING)) {
logger.info(reader.nextString());
} else if(jsonToken.equals(JsonToken.NUMBER)) {
logger.info(reader.nextInt() + "");
} else if(jsonToken.equals(JsonToken.END_OBJECT)) {
reader.endObject();
} */
// Summary summary = gson.fromJson(reader, Summary.class);
// break;
}
reader.close();
}
String filePath = "C:big-data.json";
FileInputStream in = new FileInputStream(new File(filePath));
JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
Gson gson = new GsonBuilder().create();
// reader.beginObject();
// reader.nextName();
reader.beginObject();//璺寵繃"{"
while (reader.hasNext()) {
// Read data into object model
JsonToken jsonToken = reader.peek();
if(jsonToken.equals(JsonToken.NAME)) {
String name = reader.nextName();
if(name.equalsIgnoreCase("SUMMARY")) {
// reader.beginObject();
Summary summary = gson.fromJson(reader, Summary.class);
logger.info(summary.toString());
break;
// reader.endObject();//璺寵繃"}"
}
} /*else if(jsonToken.equals(JsonToken.BEGIN_OBJECT)) {
reader.beginObject();
} else if(jsonToken.equals(JsonToken.STRING)) {
logger.info(reader.nextString());
} else if(jsonToken.equals(JsonToken.NUMBER)) {
logger.info(reader.nextInt() + "");
} else if(jsonToken.equals(JsonToken.END_OBJECT)) {
reader.endObject();
} */
// Summary summary = gson.fromJson(reader, Summary.class);
// break;
}
reader.close();
}
]]>