001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *  http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.juneau.examples.core.json;
021
022import org.apache.juneau.examples.core.pojo.Pojo;
023import org.apache.juneau.json.JsonParser;
024import org.apache.juneau.json.JsonSerializer;
025import org.apache.juneau.json.SimpleJsonSerializer;
026
027import java.util.Map;
028
029/**
030 * Sample class which shows the simple usage of JsonSerializer and JsonParser.
031 */
032public class JsonSimpleExample {
033
034   /**
035    * Serializing Pojo bean into Json format
036     * and Deserialize back to Pojo instance type.
037    * @param args
038    * @throws Exception
039    */
040   @SuppressWarnings({ "unused", "rawtypes" })
041   public static void main(String[] args) throws Exception{
042      // Juneau provides static constants with the most commonly used configurations
043      // Get a reference to a serializer - converting POJO to flat format
044      // Produces
045      // {"name":"name","id":"id"}
046      JsonSerializer jsonSerializer = JsonSerializer.DEFAULT;
047      // Get a reference to a parser - converts that flat format back into the POJO
048      JsonParser jsonParser = JsonParser.DEFAULT;
049
050      Pojo pojo = new Pojo("id","name");
051
052      String flat = jsonSerializer.serialize(pojo);
053      // Print out the created POJO in JSON format.
054      System.out.println(flat);
055
056      Pojo parse = jsonParser.parse(flat, Pojo.class);
057
058      assert parse.getId().equals(pojo.getId());
059      assert parse.getName().equals(pojo.getName());
060
061      // Produces
062      // {name:'name',id:'id'}
063      String simpleJson = SimpleJsonSerializer.DEFAULT.serialize(pojo);
064      System.out.println(simpleJson);
065
066      // Parse a JSON object (creates a generic ObjectMap).
067      String json = "{name:'John Smith',age:21}";
068      Map m1 = jsonParser.parse(json, Map.class);
069
070      // Parse a JSON string.
071      json = "'foobar'";
072      String s2 = jsonParser.parse(json, String.class);
073
074      // Parse a JSON number as a Long or Float.
075      json = "123";
076      Long l3 = jsonParser.parse(json, Long.class);
077      Float f3 = jsonParser.parse(json, Float.class);
078
079      // The object above can be parsed thanks to the @BeanConstructor(properties = id,name) annotation on Pojo
080      // Using this approach, you can keep your POJOs immutable, and still serialize and deserialize them.
081   }
082}