String str = "{'array':[{'id':5,'name':'张三'},{'id':6,'name':'李四'}]}";

 JSONArray jsonArray = null;

 jsonArray = jsonobj.getJSONArray("array");//获取数组

 System.out.println(jsonArray.getJSONObject(0).get("name"));

String str = "[{'columnId':5,'columnName':'人文历史'},{'columnId':2,'columnName':'商业视野'}]}";

JSONArray jsonArray = null;

jsonArray = new JSONArray(str);

System.out.println(jsonArray.getJSONObject(0).get("columnName"));

 JSONObject json1=JSONObject.fromObject("{'username' : '11111','clientid' : '','password' : '222222'}");

Map<String, Object> map =json1;

for (Entry<String, Object> entry : map.entrySet()) {

     System.out.println(entry.getKey()+"="+entry.getValue());

 }     

public class JsonExtracter { public static void main(String[] args) { String s = "{\"name\":\"a\",\"family\":[\"张三\",\"李四\"]}";

        JSONObject jsonObject = JSON.parseObject(s);

        //注意：family中的内容带有中括号[]，所以要转化为JSONArray类型的对象

        JSONArray family = jsonObject.getJSONArray("family");

        for (int i = 0; i < family.size(); i++) { //提取出family中的所有

            String s1 = (String) family.get(i);

            System.out.println("currentFamily:" + s1);

        } }