Created
September 9, 2024 19:15
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Simple Java utility to manage jsons easily without extra libraries
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| import java.io.BufferedReader; | |
| import java.io.File; | |
| import java.io.FileInputStream; | |
| import java.io.IOException; | |
| import java.io.InputStreamReader; | |
| import java.util.HashMap; | |
| import java.util.Map; | |
| public class JSON { | |
| private Map<String, Object> map; | |
| private static String cached; | |
| private JSON() { | |
| this.map = new HashMap<>(); | |
| } | |
| public Object get(String name) { | |
| return map.get(name); | |
| } | |
| public void put(String name, Object value) { | |
| map.put(name, value); | |
| cached = null; | |
| } | |
| public static JSON fromJsonFile(File file) throws IOException { | |
| try (BufferedReader buf = new BufferedReader(new InputStreamReader(new FileInputStream(file)))) { | |
| StringBuilder builder = new StringBuilder(); | |
| String line; | |
| while((line = buf.readLine()) != null) { | |
| builder.append(line); | |
| } | |
| return fromJsonString(builder.toString()); | |
| } | |
| } | |
| public static JSON fromJsonString(String jsonString) { | |
| JSON json = new JSON(); | |
| jsonString = jsonString.trim(); | |
| if (jsonString.startsWith("{") && jsonString.endsWith("}")) { | |
| jsonString = jsonString.substring(1, jsonString.length() - 1).trim(); | |
| } | |
| String[] keyValuePairs = jsonString.split(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)"); | |
| for (String pair : keyValuePairs) { | |
| String[] entry = pair.split(":", 2); | |
| String key = entry[0].trim().replaceAll("^\"|\"$", ""); | |
| String value = entry[1].trim(); | |
| if (value.startsWith("\"") && value.endsWith("\"")) { | |
| json.put(key, value.substring(1, value.length() - 1)); | |
| } else if ("true".equals(value) || "false".equals(value)) { | |
| json.put(key, Boolean.parseBoolean(value)); | |
| } else if ("null".equals(value)) { | |
| json.put(key, null); | |
| } else { | |
| try { | |
| json.put(key, value.contains(".") ? Double.parseDouble(value) : Integer.parseInt(value)); | |
| } catch (NumberFormatException e) { | |
| json.put(key, value); | |
| } | |
| } | |
| } | |
| cached = json.toString(); | |
| return json; | |
| } | |
| private String formatValue(Object value) { | |
| if (value instanceof String) { | |
| return "\"" + value + "\""; | |
| } | |
| if (value instanceof JSON) { | |
| return value.toString(); | |
| } | |
| return String.valueOf(value); | |
| } | |
| @Override | |
| public String toString() { | |
| if(cached == null) { | |
| StringBuilder json = new StringBuilder(); | |
| json.append("{"); | |
| int count = 0; | |
| for (Map.Entry<String, Object> entry : map.entrySet()) { | |
| json.append("\"").append(entry.getKey()).append("\": "); | |
| json.append(formatValue(entry.getValue())); | |
| count++; | |
| if (count < map.size()) { | |
| json.append(", "); | |
| } | |
| } | |
| json.append("}"); | |
| cached = json.toString(); | |
| } | |
| return cached; | |
| } | |
| } |
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