Android 发送json数据到servlet

最新推荐文章于 2022-07-20 15:22:16 发布

原创最新推荐文章于 2022-07-20 15:22:16 发布 · 2.7k 阅读

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CC 4.0 BY-SA版权

本文介绍了一个使用Android中的AsyncTask与服务器端Servlet进行JSON数据交互的具体示例。示例中展示了如何从客户端发送JSON数组到服务器，并在服务器端解析接收到的数据。

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class AT extends AsyncTask{

        @Override
        protected String doInBackground(Object[] params) {
            try{

                HttpClient hc = new DefaultHttpClient();
                HttpPost hp = new HttpPost(Config.SERVER_IP + "LoginServlet");

                List<Map<String, String>> list = new ArrayList<>();
                Map<String, String>map1 = new HashMap<>();
                map1.put("number1", "1");
                map1.put("number2", "2");
                list.add(map1);

                Map<String, String>map2 = new HashMap<>();
                map2.put("number3", "3");
                map2.put("number4", "4");
                list.add(map2);

                Gson gson = new Gson();
                String value = gson.toJson(list);


                hp.setEntity(new StringEntity(value));
                HttpResponse hr = hc.execute(hp);
                String result = null;
                if(hr.getStatusLine().getStatusCode() == 200){
                    result = EntityUtils.toString(hr.getEntity());
                    Log.d("TAG", result);
                }
                if(hc != null){
                    hc.getConnectionManager().shutdown();
                }
                return result;

            }catch (Exception e){
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPreExecute() {
            progressDialog.show();
        }

        @Override
        protected void onPostExecute(Object o) {
            progressDialog.cancel();
        }

    }

servlet代码

public class LoginServlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request, response);
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");//设置编码
		response.setContentType("text/json;charset=UTF-8");
		String reqMessage, respMessage;
		JSONArray reqObject = null;
		JSONArray respObject = null;
		
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream(), "UTF-8"));
			StringBuffer sb = new StringBuffer("");
			String temp;
			while((temp = br.readLine()) != null){
				sb.append(temp);
			}
			br.close();
			reqMessage = sb.toString();
			System.out.println("请求报文:" + reqMessage);
			JSONArray jsonArray = JSONArray.fromObject(reqMessage);
			List list = (List)JSONArray.toCollection(jsonArray, Map.class);
			HashMap<String, String>map = (HashMap<String, String>)list.get(0);
			System.out.println(map.get("number2"));
			
			
		} catch (Exception e) {
			// TODO: handle exception
		}finally {
			respMessage = "收到了报文";
			PrintWriter pw = response.getWriter();
			pw.write(respMessage);
			pw.flush();
			pw.close();
		}
		
	}

}