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

Android客户端与服务器之间传递json数据

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

Android客户端与服务器之间传递json数据

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