如何在Java中将hashmap转换为JSON对象

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Map<String, Object> data = new HashMap<String, Object>();
    data.put( "name", "Mars" );
    data.put( "age", 32 );
    data.put( "city", "NY" );
    JSONObject json = new JSONObject();
    json.putAll( data );
    System.out.printf( "JSON: %s", json.toString(2) );

JSON: {
  "age": 32,
  "name": "Mars",
  "city": "NY"
}

package com.thoughtworks.xstream.json.test;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
public class WriteTest {
    public static void main(String[] args) {
      HashMap<String,String> map = new HashMap<String,String>();
      map.add("1", "a");
      map.add("2", "b");
      XStream xstream = new XStream(new JettisonMappedXmlDriver());
      System.out.println(xstream.toXML(map));       
}

Gson gson = new Gson(); 
String json = gson.toJson(myObject);

// write Map as JSON document to http servlet response
Map<String,String> sd = DAO.getSD(123);
res.setContentType("application/json; charset=UTF-8");
res.setCharacterEncoding("UTF-8");
JsonWriter writer = new JsonWriter(new OutputStreamWriter(res.getOutputStream(), "UTF-8"));
writer.beginObject();
for(String key : sd.keySet()) {
    String val = sd.get(key);
    writer.name(key);
    if (key.equals("UniqueID") && val!=null)
        writer.value(Long.parseLong(val));
        writer.value(val);
writer.endObject();
writer.close();

Gson gson = new Gson(); 
String json = gson.toJson(myMap);

import com.github.underscore.lodash.U;
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Map<String, Object> map = new LinkedHashMap<>();
        map.put("1", "a");
        map.put("2", "b");
        System.out.println(U.toJson(map));
        //    "1": "a",
        //    "2": "b"
}

Gson gsone = new Gson();
JsonObject res = gsone.toJsonTree(sqlParams).getAsJsonObject();

Map<String, Object> map = new HashMap<>();
map.put("key", "value");
map.put("key2", "value2");
String json = "{"+map.entrySet().stream()
    .map(e -> "\""+ e.getKey() + "\":\"" + String.valueOf(e.getValue()) + "\"")
    .collect(Collectors.joining(", "))+"}";

import play.api.libs.json.{JsValue, Json}
import scala.collection.JavaConversions.mapAsScalaMap
object JsonParser {
  def parse(map: Map[String, Any]): JsValue = {
    val values = for((key, value) <- map) yield {
      value match {
        case m: java.util.Map[String, _] @unchecked => Json.obj(key -> parse(m.toMap))
        case m: Map[String, _] @unchecked => Json.obj(key -> parse(m))
        case int: Int => Json.obj(key -> int)
        case str: String => Json.obj(key -> str)
        case bool: Boolean => Json.obj(key -> bool)
    values.foldLeft(Json.obj())((temp, obj) => {
      temp.deepMerge(obj)
}

private JSONObject getJsonFromMap(Map<String, Object> map) throws JSONException {
    JSONObject jsonData = new JSONObject();
    for (String key : map.keySet()) {
        Object value = map.get(key);
        if (value instanceof Map<?, ?>) {
            value = getJsonFromMap((Map<String, Object>) value);
        jsonData.put(key, value);
    return jsonData;
}

myObject = new Gson().fromJson(new Gson().toJson(myHashMap), MyClass.class);

JSONObject object = (JSONObject) new JSONParser().parse(JSONObject.toJSONString(map));

    import org.json.JSONObject;
    HashMap<Object, Object> map = new HashMap<>();
    String[] list={"Grader","Participant"};
    String[] list1={"Assistant","intern"};
    map.put("TeachingAssistant",list);
    map.put("Writer",list1);
    JSONObject jsonObject = new JSONObject(map);
    System.out.printf(jsonObject.toString());
    // Result: {"TeachingAssistant":["Grader","Participant"],"Writer":["Assistant","intern"]}

Map obj=new HashMap();    
obj.put("name","sonoo");    
obj.put("age",new Integer(27));    
obj.put("salary",new Double(600000));   
String jsonText = JSONValue.toJSONString(obj);  
System.out.print(jsonText);

String jsonString = new JSONObject() {{
  put("firstName", user.firstName);
  put("lastName", user.lastName);
}}.toString();

{
  "firstName": "John",
  "lastName": "Doe"
}

import groovy.json.JsonBuilder
properties = new Properties()
properties.put("name", "zhangsan")
println new JsonBuilder(properties).toPrettyString()

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>VERSION_CODE</version>
</dependency>

import com.alibaba.fastjson.JSON;

String text = JSON.toJSONString(obj); // serialize
VO vo = JSON.parseObject("{...}", VO.class); //unserialize

public Object toJSON(Object object) throws JSONException {
    if (object instanceof HashMap) {
        JSONObject json = new JSONObject();
        HashMap map = (HashMap) object;
        for (Object key : map.keySet()) {
            json.put(key.toString(), toJSON(map.get(key)));
        return json;
    } else if (object instanceof Iterable) {
        JSONArray json = new JSONArray();
        for (Object value : ((Iterable) object)) {
            json.put(toJSON(value));
        return json;
    else {
        return object;
}

HashMap<String, String> params = new HashMap<>();

如何在Java中将hashmap转换为JSON对象

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