One very easy and simple approach is to use Jackson JSON to serialize complex Java Object to JSON and read it back.

http://wiki.fasterxml.com/JacksonInFiveMinutes

One very easy and simple approach is to use Jackson JSON to serialize complex Java Object to JSON and read it back.

From https://github.com/FasterXML/jackson-databind/#5-minute-tutorial-streaming-parser-generator :

JsonFactory f = mapper.getFactory(); // may alternatively construct directly too // First: write simple JSON output File jsonFile = new File("test.json"); JsonGenerator g = f.createGenerator(jsonFile); // write JSON: { "message" : "Hello world!" } g.writeStartObject(); g.writeStringField("message", "Hello world!"); g.writeEndObject(); g.close(); // Second: read file back JsonParser p = f.createParser(jsonFile); JsonToken t = p.nextToken(); // Should be JsonToken.START_OBJECT t = p.nextToken(); // JsonToken.FIELD_NAME if ((t != JsonToken.FIELD_NAME) || !"message".equals(p.getCurrentName())) { // handle error } t = p.nextToken(); if (t != JsonToken.VALUE_STRING) { // similarly } String msg = p.getText(); System.out.printf("My message to you is: %s!\n", msg); p.close();