server端：
response.setContentType("text/plain");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
UserDAO userDAO = new UserDAO();
ArrayList list = userDAO.queryUser();
JSONArray array = JSONArray.fromObject(list);
out.write(array.toString());
out.flush();
out.close();
client端：
说明：在服务器端将list集合转化为JSONArray对象，以字符串的形式传到Android的客户端，再在客户端，将字符串转换为JSONArray对象，遍历JSONArray对象即可。
转载于:https://blog.51cto.com/zhaojianping/626372