Java用Gson按照键值key排序json所有节点
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.0</version> </dependency> private static Comparator<String> getComparator() { Comparator<String> c = new Comparator<String>() { public int compare(String o1, String o2) { return o1.compareTo(o2); } }; return c; } public static void sort(JsonElement e) { if (e.isJsonNull()) { return; } if (e.isJsonPrimitive()) { return; } if (e.isJsonArray()) { JsonArray a = e.getAsJsonArray(); for (Iterator<JsonElement> it = a.iterator(); it.hasNext();) { sort(it.next()); } return; } if (e.isJsonObject()) { Map<String, JsonElement> tm = new TreeMap<String, JsonElement>(getComparator()); for (Entry<String, JsonElement> en : e.getAsJsonObject().entrySet()) { tm.put(en.getKey(), en.getValue()); } for (Entry<String, JsonElement> en : tm.entrySet()) { e.getAsJsonObject().remove(en.getKey()); e.getAsJsonObject().add(en.getKey(), en.getValue()); sort(en.getValue()); } return; } } public static void main(String[] args) { try { String json = FileUtils.readFileToString(new File("C://test//test.txt"), "UTF-8"); Gson g = new GsonBuilder().setPrettyPrinting().create(); JsonParser p = new JsonParser(); JsonElement e = p.parse(json); sort(e); System.out.println(g.toJson(e)); } catch(Exception e) { e.printStackTrace(); } } 代码样例参考了自动化测试REST API工具Wisdom RESTClient https://github.com/Wisdom-Projects/rest-client
