android客戶端從伺服器端獲取json資料並解析
阿新 • • 發佈：2019-01-29
今天總結一下：
首先客戶端從伺服器端獲取json資料
1、利用HttpUrlConnection
1 /** 2 * 從指定的URL中獲取陣列 3 * @param urlPath 4 * @return 5 * @throws Exception 6 */ 7 public static String readParse(String urlPath) throws Exception { 8 ByteArrayOutputStream outStream = new ByteArrayOutputStream();9 byte[] data = new byte[1024]; 10 int len = 0; 11 URL url = new URL(urlPath); 12 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 13 InputStream inStream = conn.getInputStream(); 14 while((len = inStream.read(data)) != -1) { 15 outStream.write(data, 0, len); 16 } 17 inStream.close(); 18 return new String(outStream.toByteArray());//通過out.Stream.toByteArray獲取到寫的資料 19 }
2、利用HttpClient
1 /** 2* 訪問資料庫並返回JSON資料字串 3 * 4 * @param params 向伺服器端傳的引數 5 * @param url 6 * @return 7 * @throws Exception 8 */ 9 public static String doPost(List<NameValuePair> params, String url) 10 throws Exception { 11 String result = null; 12 // 獲取HttpClient物件 13 HttpClient httpClient = new DefaultHttpClient(); 14 // 新建HttpPost物件 15 HttpPost httpPost = new HttpPost(url); 16 if (params != null) { 17 // 設定字符集 18 HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8); 19 // 設定引數實體 20 httpPost.setEntity(entity); 21 } 22 23 /*// 連線超時 24 httpClient.getParams().setParameter( 25 CoreConnectionPNames.CONNECTION_TIMEOUT, 3000); 26 // 請求超時 27 httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 28 3000);*/ 29 // 獲取HttpResponse例項 30 HttpResponse httpResp = httpClient.execute(httpPost); 31 // 判斷是夠請求成功 32 if (httpResp.getStatusLine().getStatusCode() == 200) { 33 // 獲取返回的資料 34 result = EntityUtils.toString(httpResp.getEntity(), "UTF-8"); 35 } else { 36 Log.i("HttpPost", "HttpPost方式請求失敗"); 37 } 38 39 return result; 40 }
其次Json資料解析：
json資料：[{"id":"67","biaoTi":"G","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741845270.png","logoLunbo":"http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg","yuanJia":"0","xianJia":"0"},{"id":"64","biaoTi":"444","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741704400.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741738500.png","yuanJia":"0","xianJia":"0"},{"id":"62","biaoTi":"jhadasd","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741500450.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741557450.png","yuanJia":"1","xianJia":"0"}]
1 /** 2 * 解析 3 * 4 * @throws JSONException 5 */ 6 private static ArrayList<HashMap<String, Object>> Analysis(String jsonStr) 7 throws JSONException { 8 /******************* 解析 ***********************/ 9 JSONArray jsonArray = null; 10 // 初始化list陣列物件 11 ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>(); 12 jsonArray = new JSONArray(jsonStr); 13 for (int i = 0; i < jsonArray.length(); i++) { 14 JSONObject jsonObject = jsonArray.getJSONObject(i); 15 // 初始化map陣列物件 16 HashMap<String, Object> map = new HashMap<String, Object>(); 17 map.put("logo", jsonObject.getString("logo")); 18 map.put("logoLunbo", jsonObject.getString("logoLunbo")); 19 map.put("biaoTi", jsonObject.getString("biaoTi")); 20 map.put("yuanJia", jsonObject.getString("yuanJia")); 21 map.put("xianJia", jsonObject.getString("xianJia")); 22 map.put("id", jsonObject.getInt("id")); 23 list.add(map); 24 } 25 return list; 26 }
最後資料適配：
1、TextView
1 /** 2 * readParse（String）從伺服器端獲取資料 3 * Analysis（String）解析json資料 4 */ 5 private void resultJson() { 6 try { 7 allData = Analysis(readParse(url)); 8 Iterator<HashMap<String, Object>> it = allData.iterator(); 9 while (it.hasNext()) { 10 Map<String, Object> ma = it.next(); 11 if ((Integer) ma.get("id") == id) { 12 biaoTi.setText((String) ma.get("biaoTi")); 13 yuanJia.setText((String) ma.get("yuanJia")); 14 xianJia.setText((String) ma.get("xianJia")); 15 } 16 } 17 } catch (JSONException e) { 18 e.printStackTrace(); 19 } catch (Exception e) { 20 e.printStackTrace(); 21 } 22 }
2、ListView：
1 /** 2 * ListView 資料適配 3 */ 4 private void product_data(){ 5 List<HashMap<String, Object>> lists = null; 6 try { 7 lists = Analysis(readParse(url));//解析出json資料 8 } catch (Exception e) { 9 // TODO Auto-generated catch block 10 e.printStackTrace(); 11 } 12 List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>(); 13 for(HashMap<String, Object> news : lists){ 14 HashMap<String, Object> item = new HashMap<String, Object>(); 15 item.put("chuXingTianShu", news.get("chuXingTianShu")); 16 item.put("biaoTi", news.get("biaoTi")); 17 item.put("yuanJia", news.get("yuanJia")); 18 item.put("xianJia", news.get("xianJia")); 19 item.put("id", news.get("id")); 20 21 try { 22 bitmap = ImageService.getImage(news.get("logo").toString());//圖片從伺服器上獲取 23 } catch (Exception e) { 24 // TODO Auto-generated catch block 25 e.printStackTrace(); 26 } 27 if(bitmap==null){ 28 Log.i("bitmap", ""+bitmap); 29 Toast.makeText(TravelLine.this, "圖片載入錯誤", Toast.LENGTH_SHORT) 30 .show(); // 顯示圖片編號 31 } 32 item.put("logo",bitmap); 33 data.add(item); 34 } 35 listItemAdapter = new MySimpleAdapter1(TravelLine.this,data,R.layout.a_travelline_item, 36 // 動態陣列與ImageItem對應的子項 37 new String[] { "logo", "biaoTi", 38 "xianJia", "yuanJia", "chuXingTianShu"}, 39 // ImageItem的XML檔案裡面的一個ImageView,兩個TextView ID 40 new int[] { R.id.trl_ItemImage, R.id.trl_ItemTitle, 41 R.id.trl_ItemContent, R.id.trl_ItemMoney, 42 R.id.trl_Itemtoday}); 43 listview.setAdapter(listItemAdapter); 44 //新增點選 45 listview.setOnItemClickListener(new OnItemClickListener() { 46 public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 47 long arg3) { 48 login_publicchannel_trl_sub(arg2); 49 } 50 }); 51 }
對於有圖片的要重寫介面卡
1 package com.nuoter.adapterUntil; 2 3 4 import java.util.HashMap; 5 import java.util.List; 6 7 8 import android.content.Context; 9 import android.graphics.Bitmap; 10 import android.graphics.BitmapFactory; 11 import android.graphics.Paint; 12 import android.net.Uri; 13 import android.view.LayoutInflater; 14 import android.view.View; 15 import android.view.ViewGroup; 16 import android.widget.BaseAdapter; 17 import android.widget.ImageView; 18 import android.widget.LinearLayout; 19 import android.widget.TextView; 20 21 22 public class MySimpleAdapter1 extends BaseAdapter { 23 private LayoutInflater mInflater; 24 private List<HashMap<String, Object>> list; 25 private int layoutID; 26 private String flag[]; 27 private int ItemIDs[]; 28 public MySimpleAdapter1(Context context, List<HashMap<String, Object>> list, 29 int layoutID, String flag[], int ItemIDs[]) { 30 this.mInflater = LayoutInflater.from(context); 31 this.list = list; 32 this.layoutID = layoutID; 33 this.flag = flag; 34 this.ItemIDs = ItemIDs; 35 } 36 @Override 37 public int getCount() { 38 // TODO Auto-generated method stub 39 return list.size(); 40 } 41 @Override 42 public Object getItem(int arg0) { 43 // TODO Auto-generated method stub 44 return 0; 45 } 46 @Override 47 public long getItemId(int arg0) { 48 // TODO Auto-generated method stub 49 return 0; 50 } 51 @Override 52 public View getView(int position, View convertView, ViewGroup parent) { 53 convertView = mInflater.inflate(layoutID, null); 54 // convertView = mInflater.inflate(layoutID, null); 55 for (int i = 0; i < flag.length; i++) {//備註1 56 if (convertView.findViewById(ItemIDs[i]) instanceof ImageView) { 57 ImageView imgView = (ImageView) convertView.findViewById(ItemIDs[i]); 58 imgView.setImageBitmap((Bitmap) list.get(position).get(flag[i]));///////////關鍵是這句!!!!!!!!!!!!!!! 59 60 }else if (convertView.findViewById(ItemIDs[i]) instanceof TextView) { 61 TextView tv = (TextView) convertView.findViewById(ItemIDs[i]); 62 tv.setText((String) list.get(position).get(flag[i])); 63 }else{ 64 //...備註2 65 } 66 } 67 //addListener(convertView); 68 return convertView; 69 } 70 71 /* public void addListener(final View convertView) { 72 73 ImageView imgView = (ImageView)convertView.findViewById(R.id.lxs_item_image); 74 75 76 77 } */ 78 79 }
ImageService工具類
1 package com.nuoter.adapterUntil; 2 3