Iterator iter = jsonInfo.entrySet().iterator();

public class Test {
  public static void main(String[] args) {    
    JSONObject jsonInfo = new JSONObject();
    String key1 = "a";
    jsonInfo.put(key1, "aa");
    String key2 = "b";
    jsonInfo.put(key2, "bb");
    
    Iterator iter = jsonInfo.entrySet().iterator();
    while (iter.hasNext()) {
      Map.Entry entry = (Map.Entry) iter.next();
      System.out.println(entry.getKey().toString());
      System.out.println(entry.getValue().toString());
    }
  }
}

package com.dufy.javatojson; 
import java.util.Iterator; 
import javax.sound.midi.Synthesizer; 
import org.json.JSONArray;
import org.json.JSONObject; 
public class TraverseJson {
 
 /**
 * 遍歷json格式數(shù)據(jù)
 * @param json
 * @return
 */
 public static Object traveseJson(Object json){
 
 if(json == null){
  return null;
 }
 if(json instanceof JSONObject){//json 是一個(gè)map
  //創(chuàng)建一個(gè)json對(duì)象
  JSONObject jsonObj = new JSONObject();
  //將json轉(zhuǎn)換為JsonObject對(duì)象
  JSONObject jsonStr = (JSONObject) json;
  //迭代器迭代 map集合所有的keys
  Iterator it = jsonStr.keys();
  while(it.hasNext()){
  //獲取map的key
  String key = (String) it.next();
  //得到value的值
  Object value = jsonStr.get(key);
  //System.out.println(value);
  //遞歸遍歷
  jsonObj.put(key, traveseJson(value));  
  }
  return jsonObj;
  
 }else if(json instanceof JSONArray){// if json 是 數(shù)組
  JSONArray jsonAry = new JSONArray();
  JSONArray jsonStr = (JSONArray) json;
  //獲取Array 的長(zhǎng)度
  int length = jsonStr.length();
  for (int i = 0; i <length; i++) {
  jsonAry.put(traveseJson(jsonStr.get(i)));
  }
  
  return jsonAry;  
 }else {//其他類型  
  return json;
 }  
 }
 
 
 
 public static void main(String[] args) {
 System.out.println(traveseJson("傳入要遍歷的json"));
// 生成的JSON數(shù)據(jù)1 
// {
//  "QQ":["742981086@qq.com","742981086"],
//  "age":22,
//   "name":"aflyun",
//  "hobby":["編程","看書(shū)","徒步","爬山","游泳"],
//  "adderss":{"省份":"廣東","市":"惠州","國(guó)籍":"中國(guó)"}
// }  
 //創(chuàng)建 一個(gè)JsonObjec對(duì)象
  JSONObject resJsonObj = new JSONObject();
    //姓名
  resJsonObj.put("name", "aflyun");
  //年齡
  resJsonObj.put("age", 22);
  //聯(lián)系方式
  JSONArray arryQq = new JSONArray();
  arryQq.put("742981086@qq.com").put("742981086");
  resJsonObj.put("QQ", arryQq);
  //地址 map
  JSONObject jsonAdress = new JSONObject();
  jsonAdress.put("國(guó)籍", "中國(guó)").put("省份", "廣東").put("市", "惠州");
  resJsonObj.put("adderss", jsonAdress);
  //生成數(shù)組array
  JSONArray jArray = new JSONArray();
  jArray.put("編程").put("看書(shū)").put("徒步").put("爬山").put("游泳");
  resJsonObj.put("hobby", jArray);  
  System.out.println(resJsonObj);  
  System.err.println(traveseJson(resJsonObj));
  
//數(shù)組類型的json格式數(shù)據(jù)生成  
 //[
 // {"hello":"你好"},
 // [
 //  {"在干嘛":"編程"},
 //  ["睡覺(jué)了嗎","沒(méi)有","不想睡","醒來(lái)了"]
 // ]
 //]
  
  JSONArray retJson = new JSONArray();
  //hello 
  JSONObject aJosn = new JSONObject();
  aJosn.put("hello", "你好");
  retJson.put(aJosn);
  //數(shù)組在干嘛和睡覺(jué)了嗎 組裝[]
  JSONArray jsa = new JSONArray();
  JSONObject jOne = new JSONObject();
  jOne.put("在干嘛", "編程");
  JSONArray jTwo = new JSONArray();
  jTwo.put("沒(méi)有").put("不想睡").put("");
  JSONObject jOne1 = new JSONObject("醒來(lái)了");
  jOne1.put("睡覺(jué)了嗎", jTwo);
  jsa.put(jOne).put(jOne1);
 //將組裝好的數(shù)據(jù)放入要返回的json數(shù)組中
  retJson.put(jsa);
  
  System.out.println("------" + retJson);
  System.err.println("------" + traveseJson(retJson)); 
 }
}

{"QQ":["742981086@qq.com","742981086"],"age":22,"name":"aflyun","hobby":["編程","看書(shū)","徒步","爬山","游泳"],"adderss":{"省份":"廣東","市":"惠州","國(guó)籍":"中國(guó)"}}
------[{"a":"a"},[{"b":"b"},{"c":[1,2,3]}]]
{"QQ":["742981086@qq.com","742981086"],"name":"aflyun","age":22,"hobby":["編程","看書(shū)","徒步","爬山","游泳"],"adderss":{"省份":"廣東","市":"惠州","國(guó)籍":"中國(guó)"}}
------[{"a":"a"},[{"b":"b"},{"c":[1,2,3]}]]