Android客户端与服务器之间传递json数据

在服务器与客户端之间通信，json数据是一种常用格式，本文主要在服务器端构建数据，在客户端接收显示，并且在listview上显示出来

服务器端的构建

简单的javabean与返回结果函数与插入函数略过

public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
          response.setContentType("text/html");

          response.setCharacterEncoding("UTF-8");

          PrintWriter out = response.getWriter();

          List<MyShop> shops = JsonService.getListShop();

          StringBuffer sb = new StringBuffer();

          sb.append('[');

          for (MyShop shop : shops) {

                  sb.append('{').append("\"name\":").append("\""+shop.getName()+"\"").append(",");
                  sb.append("\"detail\":").append("\""+shop.getDetail()+"\"").append(",");
                  sb.append("\"distance\":").append("\""+shop.getDistance()+"\"").append(",");
                  sb.append("\"address\":").append("\""+shop.getAddress()+"\"").append(",");
                  sb.append("\"popularity\":").append(shop.getPopularity());
                  sb.append('}').append(",");
          }

          sb.deleteCharAt(sb.length() - 1);

          sb.append(']');

          out.write(new String(sb));

          out.flush();

          out.close();

    }

在浏览器中直接输入访问http://localhost:8080/AppServer/JsonServlet

可得

可以在服务器端直接查看json数据

客户端接收与解析json数据

public class JsonParse {

    /**

     * 解析Json数据

     *

     * @param urlPath

     * @return mlists

     * @throws Exception

     */

    public static List<MyShop> getListShop(String urlPath) throws Exception {

            List<MyShop> mlists = new ArrayList<MyShop>();

            byte[] data = readParse(urlPath);

            JSONArray array = new JSONArray(new String(data));

            for (int i = 0; i < array.length(); i++) {

                    JSONObject item = array.getJSONObject(i);

                    String name = item.getString("name");
                    String detail = item.getString("detail");
                    String distance = item.getString("distance");

                    String popularity = item.getString("popularity");

                    String address = item.getString("address");

                    mlists.add(new MyShop(name, detail, distance,address,popularity));

            }

            return mlists;

    }

    /**

     * 从指定的url中获取字节数组

     *

     * @param urlPath

     * @return 字节数组

     * @throws Exception

     */

    public static byte[] readParse(String urlPath) throws Exception {

            ByteArrayOutputStream outStream = new ByteArrayOutputStream();

            byte[] data = new byte[1024];

            int len = 0;

            URL url = new URL(urlPath);

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            InputStream inStream = conn.getInputStream();

            while ((len = inStream.read(data)) != -1) {

                    outStream.write(data, 0, len);

            }

            inStream.close();

            return outStream.toByteArray();

    }

}

在activity中开启子线程来接收服务器数据

new Thread(new Runnable() {

            private String tag;

            @Override
            public void run() {
                // TODO Auto-generated method stub
                //获得新闻集合

                List<MyShop> shopList = null;
                try {
                    shopList = JsonParse.getListShop("http://192.168.247.1:8080/AppServer/JsonServlet");
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                Log.i(tag, "在RUN中LIST长度为"+shopList.size());
                Message msg=new Message();
                if(shopList!=null)
                {
                    msg.what=SUCCESS;
                    msg.obj=shopList;

                }else
                {
                    msg.what=FAILED;
                }
                handler.sendMessage(msg);
                Log.i(tag, "***********T长度为"+shopList.size());

            }
        }).start();

消息处理器

 //消息处理器
    private Handler handler=new Handler(){

        /**
         * 接收消息
         */
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub

            String tag = null;
            switch (msg.what) {
            case SUCCESS:  //访问成功，有数据

                //绑定数据
                Log.i(tag,"%%%%%%%%%%到达了消息处理器");
                myshoplist=(List<MyShop>) msg.obj;
                Log.i(tag, "handleMessage中数据newInfoList长度为"+myshoplist.size());
                NearAdapter adapter=new NearAdapter();
                Log.i(tag, "有没有到达ADAPTER"+adapter.getCount());
                showList.setAdapter(adapter);

                break;

          case FAILED:    //访问失败
                Toast.makeText(ChooseMer.this, "当前网络崩溃了", 0).show();
                break;

            default:
                break;
            }

        }

    };

配置适配器

public class NearAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return  myshoplist.size();
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            if (convertView == null) {
                LayoutInflater inflater = LayoutInflater
                        .from(ChooseMer.this);
                convertView = inflater.inflate(R.layout.nearby_list_item, null);
                init(convertView,position);
            }

            return convertView;
        }

        public void init(View convertView,int position) {
            hold.name = (TextView) convertView
                    .findViewById(R.id.nearby_item_name);
            MyShop shop=myshoplist.get(position);
            hold.name.setText(shop.getName());
            hold.local = (TextView) convertView
                    .findViewById(R.id.nearby_item_local);
            hold.local.setText(shop.getDetail());
            hold.dis1 = (TextView) convertView
                    .findViewById(R.id.nearby_item_dis1);
            hold.dis1.setText(shop.getDistance());
            hold.dis2 = (TextView) convertView
                    .findViewById(R.id.nearby_item_dis2);
            hold.dis2.setText(shop.getAddress());
            hold.dis3 = (TextView) convertView
                    .findViewById(R.id.nearby_item_dis3);
            hold.dis3.setText(shop.getPopularity());
        }
    }

配置完成，效果如下