解析JSONObject为key-value
String params="";//json格式的字符串
JSONObject data = JSONObject .fromObject(params);
Set<Map.Entry<String, Object>> entries = data.entrySet();
Iterator<Map.Entry<String, Object>> it = entries.iterator();
String param="";
while (it.hasNext()) {
Map.Entry<String, Object> next = it.next();
String key = next.getKey();
Object value = next.getValue();
param+=key+"="+value;
}
System.out.println(param);