java List<Map<String,Object>遍历的方法

    public static void main(String[] args) {
        List<HashMap<String, Object>> list = new ArrayList<HashMap<String,Object>>();

        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("", "a");
        map.put("", "b");
        map.put("", "c");

        list.add(map);

        JSONObject result = new JSONObject(); //全局变量
　　　　
        JSONArray jsonArray = new JSONArray();
        for (int i = ; i < list.size(); i++) {

            JSONObject jsonObj = new JSONObject();//循环体内变量

            HashMap<String, Object> m = list.get(i);
            Set<String> set = m.keySet();
            Iterator<String> it = set.iterator();
            while (it.hasNext()) {
                String key = (String) it.next();

                jsonObj.accumulate(key, m.get(key));

                System.out.println(key+"-----------key-----------"+m.get(key)+"---------value---------------");
            }
            jsonArray.add(jsonObj);
        }

        System.out.println(result.accumulate("test", jsonArray)+"------------jsonArray-----------------");

        System.out.println("");

        for (HashMap<String, Object> hashMap : list) {
            for (Map.Entry<String, Object> m : hashMap.entrySet()) {
                System.out.println(m.getKey()+"------key--------"+m.getValue());
            }
        }

        System.out.println("");

    }

结果:

-----------key-----------c---------value---------------
-----------key-----------b---------value---------------
-----------key-----------a---------value---------------
{"test":[{"":"c","":"b","":"a"}]}------------jsonArray-----------------

------key--------c
------key--------b
------key--------a

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    public static void main(String[] args) {
        List<HashMap<String, Object>> list = new ArrayList<HashMap<String,Object>>();

        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("", "a");
        map.put("", "b");
        map.put("", "c");

        HashMap<String, Object> map2 = new HashMap<String, Object>();
        map2.put("", "d");
        map2.put("", "e");
        map2.put("", "f");

        list.add(map);
        list.add(map2);
        System.out.println(list.size()+"-------------------------");

        JSONObject result = new JSONObject();

        JSONArray jsonArray = new JSONArray();

        for (int i = ; i < list.size(); i++) {

            HashMap<String, Object> hashMap1 = new HashMap<String, Object>();

            HashMap<String, Object> m = list.get(i);
            Set<String> set = m.keySet();
            Iterator<String> it = set.iterator();
            while (it.hasNext()) {
                String key = (String) it.next();

                hashMap1.put(key, m.get(key));

                System.out.println(key+"-----------key-----------"+m.get(key)+"---------value---------------");
            }
            jsonArray.add(hashMap1);
            System.out.println(hashMap1+"------------------------hashMap1------------------");

        }
        System.out.println(result.accumulate("test", jsonArray)+"------------jsonArray-----------------");

        System.out.println("");

        for (HashMap<String, Object> hashMap : list) {
            for (Map.Entry<String, Object> m : hashMap.entrySet()) {
                System.out.println(m.getKey()+"------key--------"+m.getValue());
            }
        }

        System.out.println("");

        List<HashMap<String, Object>> list1 = new LinkedList<HashMap<String, Object>>();

        for (int i = ; i < list.size(); i++) {

            HashMap<String, Object> hashMap2 = new HashMap<String, Object>();

            HashMap<String, Object> m = list.get(i);
            Set<String> set = m.keySet();
            Iterator<String> it = set.iterator();
            while (it.hasNext()) {
                String key = (String) it.next();

                hashMap2.put(key, m.get(key));

                System.out.println(key+"-----------key-----------"+m.get(key)+"---------value---------------");
            }
            list1.add(hashMap2);

        }
        System.out.println(list1+"------------list1-----------------");

    }

结果 :

-----------key-----------c---------value---------------
-----------key-----------b---------value---------------
-----------key-----------a---------value---------------
{=c, =b, =a}------------------------hashMap1------------------
-----------key-----------f---------value---------------
-----------key-----------e---------value---------------
-----------key-----------d---------value---------------
{=f, =e, =d}------------------------hashMap1------------------
{"test":[{"":"c","":"b","":"a"},{"":"f","":"e","":"d"}]}------------jsonArray-----------------

------key--------c
------key--------b
------key--------a
------key--------f
------key--------e
------key--------d

-----------key-----------c---------value---------------
-----------key-----------b---------value---------------
-----------key-----------a---------value---------------
-----------key-----------f---------value---------------
-----------key-----------e---------value---------------
-----------key-----------d---------value---------------
[{=c, =b, =a}, {=f, =e, =d}]------------list1-----------------