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