How can we read and write files in Java using Gson streaming API?

We can useGson Streaming APIto read and write files, which is based on the sequential reading and writing standard.JsonWriterandJsonReaderare core classes built for streaming writing and reading in theStreaming API.JsonWriterWrites JSON encoded values to the stream, one token at a time. The stream contains literal values (strings, numbers, booleans, and null) as well asStartandEnddelimitersobjects and arrays,JsonReaderRead JSON encoded values as a token stream. This stream containsliteralvalues(strings, numbers, booleans, and nulls)and start andEnd delimiter. Tokens are traversed indepth-first orderr, in the same order in which they appear in the JSON document.

Write files using JsonWriter

Example

import java.io.*; import com.google.gson.stream.*; public class JsonWriterTest { public static void main(String args[]) { JsonWriter writer; try { writer = new JsonWriter(new FileWriter("input.json")); writer.beginObject(); writer.name("name").value("Adithya"); writer.name("age").value(25); writer.name("technologies"); writer.beginArray(); writer.value("Java"); writer.value("Scala"); writer.value("Python"); writer.endArray(); writer.endObject(); writer.close(); System.out.println("Data write to a file successfully"); } catch(Exception e) { e.printStackTrace(); } } }

Output

Data write to a file successfully 

import java.io.*; import com.google.gson.stream.*; public class JsonReaderTest { public static void main(String args[]) { JsonReader reader; try { reader = new JsonReader(new FileReader("input.json")); reader.beginObject(); while(reader.hasNext()) { String name = reader.nextName(); if(name.equals("name")) { System.out.println(reader.nextString()); } else if(name.equals("age")) { System.out.println(reader.nextInt()); } else if(name.equals("technologies")) { reader.beginArray(); while(reader.hasNext()) { System.out.println(reader.nextString()); } reader.endArray(); } else { reader.skipValue(); } } reader.endObject(); reader.close(); } catch(Exception e) { e.printStackTrace(); } } }

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Adithya 25 Java Scala Python

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