Android向服務器端發送json數據

android 向服務器端發送json數據，本文講解的知識點比較基礎，如果你是大神，請直接關閉該網頁，免得浪費你寶貴時間。

1.向服務器端發送json數據
關鍵代碼：

   public void sendJsonToServer() {
		HttpClient httpClient = new DefaultHttpClient();
		try {

			HttpPost httpPost = new HttpPost(constant.url);
			HttpParams httpParams = new BasicHttpParams();
			List nameValuePair = new ArrayList();
			Gson gson = new Gson();
			String str = gson.toJson(initData());
			nameValuePair.add(new BasicNameValuePair("jsonString", URLEncoder
					.encode(str, "utf-8")));
			httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
			httpPost.setParams(httpParams);
			Toast.makeText(Main.this, "發送的數據：\n" + str.toString(),
					Toast.LENGTH_SHORT).show();
			httpClient.execute(httpPost);
			HttpResponse response = httpClient.execute(httpPost);
			StatusLine statusLine = response.getStatusLine();
			if (statusLine != null && statusLine.getStatusCode() == 200) {
				HttpEntity entity = response.getEntity();
				if (entity != null) {
					Toast.makeText(
							Main.this,
							"服務器處理返回結果：" + readInputStream(entity.getContent()),
							Toast.LENGTH_SHORT).show();
				} else {
					Toast.makeText(Main.this, "沒有返回相關數據", Toast.LENGTH_SHORT)
							.show();
				}
			} else {
				Toast.makeText(Main.this, "發送失敗，可能服務器忙，請稍後再試",
						Toast.LENGTH_SHORT).show();
			}
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	private static String readInputStream(InputStream is) throws IOException {
		if (is == null)
			return null;
		ByteArrayOutputStream bout = new ByteArrayOutputStream();
		int len = 0;
		byte[] buf = new byte[1024];
		while ((len = is.read(buf)) != -1) {
			bout.write(buf, 0, len);
		}
		is.close();
		return URLDecoder.decode(new String(bout.toByteArray()), "utf-8");
	}
/*
 * 填充數據源
 */
	public List initData() {
		List persons = new ArrayList();
		for (int i = 0; i < 5; i++) {
			Product p = new Product();
			p.setLocation("所在位置");
			p.setName("名稱" + i);
			persons.add(p);
		}
		return persons;
	}

2.服務器端接收json數據後返回處理結果


3.利用Gson將集合轉換成json形式
如果你還沒有聽過gson 或是對其不是很熟悉，請先參考Android解析json數據（Gson)，或是百度 谷歌之。

4.服務器端采用VS建立一個網站，新建一個頁面androidtest.aspx
源碼：

protected void Page_Load(object sender, EventArgs e)
    {
        if (Request["jsonString"] != null)
        {
            string json = Request["jsonString"].ToString().Trim();
            json = HttpUtility.UrlDecode(json);
            try
            {
                string str = json.Substring(0, json.Length - 1);//去掉最後一個]
                str = str.Substring(1);//去掉第一個[
                string[] sArray = Regex.Split(str, "},");
                JavaScriptSerializer jss = new JavaScriptSerializer();
                for (int i = 0; i < sArray.Length; i++)
                {
                    if (i < sArray.Length - 1)
                    {
                        sArray[i] += "}";
                    }
                    ProductBillList list = jss.Deserialize(sArray[i]);
                    Response.Write(list.location + list.name + "\n");
                }
            }
            catch
            {
                Response.Write("出現異常");
            }
        }
        else
        {
            Response.Write("接收數據失敗");
        }
    }
    public class ProductBill
    {
        public List ProductBillLists { get; set; }
    }

    public class ProductBillList
    {
        public String name { get; set; }
        public String location { get; set; }
    }
     

效果：