public class HttpUtil {
public static final String BASE_URL = "http://10.0.2.2:8080/jsontest/servlet/ProductServlet";
public static final String IMG_URL = "http://10.0.2.2:8080/jsontest/upload/";
public static HttpClient httpClient = new DefaultHttpClient();
// post方法访问服务器，返回json字符串
public static String getRequest(String url){
String result = null;
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
result = EntityUtils.toString(httpResponse.getEntity(),"utf-8");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}
// 字符串转成集合数据
public static void resultString2List(List<Map<String ,Object>> list, String str,String title) {
try {
JSONObject jsonObject = new JSONObject(str);
JSONArray jsonArray = jsonObject.getJSONArray(title);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject2 = jsonArray.getJSONObject(i);
Map<String ,Object> map = new HashMap<String, Object>();
Iterator<String> iterator = jsonObject2.keys();
while (iterator.hasNext()) {
String key = iterator.next();
Object value = jsonObject2.get(key);
map.put(key, value);
}
list.add(map);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// post方法访问服务器，返回集合数据
public static List<Map<String,Object>> getRequest2List(String url,String title){
List<Map<String,Object>> list = new ArrayList<Map<String ,Object>>();
resultString2List(list, url, title);
return list;
}
// get方法访问服务器，返回json字符串
public static String postRequest(String url, Map<String,String> rawParams) throws Exception{
HttpPost post = new HttpPost(url);
List<NameValuePair> params = new ArrayList<NameValuePair>();
for (String key:rawParams.keySet()) {
params.add(new BasicNameValuePair(key, rawParams.get(key)));
}
post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
HttpResponse httpResponse = httpClient.execute(post);
if(httpResponse.getStatusLine().getStatusCode() == 200){
String result = EntityUtils.toString(httpResponse.getEntity());
return result;
}
return null;
}
//post访问的方法，还可继续封装，略。。。
}
public class MyTask extends AsyncTask<String, Void, List<Map<String,Object>>>{
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progressDialog.show();
}
@Override
protected void onPostExecute(List<Map<String, Object>> result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
adapter.setData(result);
listview.setAdapter(adapter);
adapter.notifyDataSetChanged();
progressDialog.dismiss();
}
@Override
protected List<Map<String, Object>> doInBackground(String... params) {
// TODO Auto-generated method stub
List<Map<String,Object>> list ;
String str = HttpUtil.getRequest(params[0]);
list = HttpUtil.getRequest2List(str, "products");
return list;
}
}
progressDialog = new ProgressDialog(this);
progressDialog.setTitle("正在下载....");
adapter = new MyAdapter(this);
new MyTask().execute(HttpUtil.BASE_URL);
public class MyAdapter extends BaseAdapter{
private Context context;
private LayoutInflater layoutInflater;
private List<Map<String,Object>> list;
public MyAdapter(Context context) {
this.context = context;
layoutInflater = layoutInflater.from(context);
}
public List getData(){
return list;
}
public void setData(List<Map<String,Object>> data){
this.list = data;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View view = null;
final ViewHolder viewHolder;
if (convertView == null ) {
convertView = layoutInflater.inflate(R.layout.item, null);
viewHolder = new ViewHolder();
viewHolder.id = (TextView)convertView.findViewById(R.id.textView1);
viewHolder.name = (TextView)convertView.findViewById(R.id.textView2);
viewHolder.address = (TextView)convertView.findViewById(R.id.textView3);
viewHolder.img = (ImageView)convertView.findViewById(R.id.imageView1);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder)convertView.getTag();
}
viewHolder.id.setText(list.get(position).get("sid").toString());
viewHolder.name.setText(list.get(position).get("name").toString());
viewHolder.address.setText(list.get(position).get("addr").toString());
//接口回调的方法，完成图片的读取;
DownImage downImage = newDownImage(HttpUtil.IMG_URL+list.get(position).get("pic").toString()+".jpg");
downImage.loadImage(new ImageCallBack() {
@Override
public void getDrawable(Drawable drawable) {
// TODO Auto-generated method stub
viewHolder.img.setImageDrawable(drawable);
}
});
return convertView;
}
}
public class ViewHolder{
ImageView img;
TextView id;
TextView name;
TextView address;
}
public class DownImage {
public String image_path;
public DownImage(String image_path) {
this.image_path = image_path;
}
public void loadImage(final ImageCallBack callBack){
final Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
Drawable drawable = (Drawable) msg.obj;
callBack.getDrawable(drawable);
}
};
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
Drawable drawable = Drawable.createFromStream(new URL(image_path).openStream(), "");
Message message = Message.obtain();
message.obj = drawable;
handler.sendMessage(message);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
public interface ImageCallBack{
public void getDrawable(Drawable drawable);
}
}