我做了下面的代码，我没有过多地考虑性能，但它工作得很好

AppTest.java

public class AppTest {
    @Test
    public void testApp() {
        LinkedTreeMap<String, Object> node = new LinkedTreeMap<>();
        LinkedTreeMap<String, Object> node2 = new LinkedTreeMap<>();
        LinkedTreeMap<String, Object> node3 = new LinkedTreeMap<>();
        node2.put("embembVal1", "embemb1");
        node2.put("embembVal2", "embemb2");
        node3.put("embVal1", "emb1");
        node3.put("embVal2", node2);
        node.put("val1", "1");
        node.put("val2", "2");
        node.put("val3", node3);
        node.put("val4", "4");
        MyJson json = new MyJson();
        json.read(node);
        System.out.println(MyJsonBuilder.build());
}

MyJson.java

public class MyJson {
    public void read(LinkedTreeMap<String, Object> node) {
        MyJsonBuilder.append("{");
        for(Entry<String, Object> set : node.entrySet()) {
            if(!getInstanceType(set.getValue())) {
                jsonFormat(set.getKey(), set.getValue());
            } else {
                new MyJson().read( (LinkedTreeMap<String, Object>) set.getValue() );
        MyJsonBuilder.append("}");
    private void jsonFormat(String k, Object v) {
        MyJsonBuilder.append( String.format("\"%s\":\"%s\"", k, v) );
    private boolean getInstanceType(Object obj) {
        if(obj instanceof LinkedTreeMap) return true;
        else return false;
}

MyJsonBuilder.java

public class MyJsonBuilder {
    private static StringBuilder jsonBuilder = new StringBuilder();
    public static void append(String node) {
        jsonBuilder.append(node);
    private static String format(String json) {
        String adjustedjson = json;
        if (adjustedjson.contains("\"\"")) adjustedjson = adjustedjson.replaceAll("\"\"", "\",\"");
        if (adjustedjson.contains("}\"")) adjustedjson = adjustedjson.replaceAll("}\"", "},\"");
        return adjustedjson;