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 * 032 * <ul class='seealso'> 033 * <li class='extlink'>{@source} 034 * </ul> 035 */ 036public class JsonSimpleExample { 037 038 /** 039 * Serializing Pojo bean into Json format and Deserialize back to Pojo instance type. 040 * 041 * @param args Unused. 042 * @throws Exception Unused. 043 */ 044 @SuppressWarnings({ "unused", "rawtypes" }) 045 public static void main(String[] args) throws Exception{ 046 // Juneau provides static constants with the most commonly used configurations 047 // Get a reference to a serializer - converting POJO to flat format 048 // Produces 049 // {"name":"name","id":"id"} 050 JsonSerializer jsonSerializer = JsonSerializer.DEFAULT; 051 // Get a reference to a parser - converts that flat format back into the POJO 052 JsonParser jsonParser = JsonParser.DEFAULT; 053 054 Pojo pojo = new Pojo("id","name"); 055 056 String flat = jsonSerializer.serialize(pojo); 057 // Print out the created POJO in JSON format. 058 System.out.println(flat); 059 060 Pojo parse = jsonParser.parse(flat, Pojo.class); 061 062 assert parse.getId().equals(pojo.getId()); 063 assert parse.getName().equals(pojo.getName()); 064 065 // Produces 066 // {name:'name',id:'id'} 067 String simpleJson = SimpleJsonSerializer.DEFAULT.serialize(pojo); 068 System.out.println(simpleJson); 069 070 // Parse a JSON object (creates a generic ObjectMap). 071 String json = "{name:'John Smith',age:21}"; 072 Map m1 = jsonParser.parse(json, Map.class); 073 074 // Parse a JSON string. 075 json = "'foobar'"; 076 String s2 = jsonParser.parse(json, String.class); 077 078 // Parse a JSON number as a Long or Float. 079 json = "123"; 080 Long l3 = jsonParser.parse(json, Long.class); 081 Float f3 = jsonParser.parse(json, Float.class); 082 083 // The object above can be parsed thanks to the @Beanc(properties = id,name) annotation on Pojo 084 // Using this approach, you can keep your POJOs immutable, and still serialize and deserialize them. 085 } 086}