Android向服务器端发送json数据



  


  • android 向服务器端发送json数据，本文讲解的知识点比较基础，如果你是大神，请直接关闭该网页，免得浪费你宝贵时间。 1.向服务器端发送json数据 关键代码：
public void sendJsonToServer() {
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HttpClient httpClient = new DefaultHttpClient();
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try {
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HttpPost httpPost = new HttpPost(constant.url);
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HttpParams httpParams = new BasicHttpParams();
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List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
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Gson gson = new Gson();
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String str = gson.toJson(initData());
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nameValuePair.add(new BasicNameValuePair("jsonString", URLEncoder
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.encode(str, "utf-8")));
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httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
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httpPost.setParams(httpParams);
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Toast.makeText(Main.this, "发送的数据：\n" + str.toString(),
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Toast.LENGTH_SHORT).show();
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httpClient.execute(httpPost);
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HttpResponse response = httpClient.execute(httpPost);
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StatusLine statusLine = response.getStatusLine();
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if (statusLine != null && statusLine.getStatusCode() == 200) {
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HttpEntity entity = response.getEntity();
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if (entity != null) {
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Toast.makeText(
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Main.this,
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"服务器处理返回结果：" + readInputStream(entity.getContent()),
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Toast.LENGTH_SHORT).show();
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} else {
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Toast.makeText(Main.this, "没有返回相关数据", Toast.LENGTH_SHORT)
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.show();
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}
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} else {
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Toast.makeText(Main.this, "发送失败，可能服务器忙，请稍后再试",
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Toast.LENGTH_SHORT).show();
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}
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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private static String readInputStream(InputStream is) throws IOException {
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if (is == null)
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return null;
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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int len = 0;
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byte[] buf = new byte[1024];
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while ((len = is.read(buf)) != -1) {
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bout.write(buf, 0, len);
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}
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is.close();
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return URLDecoder.decode(new String(bout.toByteArray()), "utf-8");
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}
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/*
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* 填充数据源
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*/
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public List<Product> initData() {
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List<Product> persons = new ArrayList<Product>();
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for (int i = 0; i < 5; i++) {
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Product p = new Product();
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p.setLocation("所在位置");
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p.setName("名称" + i);
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persons.add(p);
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}
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return persons;
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}

2.服务器端接收json数据后返回处理结果


3.利用Gson将集合转换成json形式
如果你还没有听过gson 或是对其不是很熟悉，请先参考Android解析json数据（Gson)，或是百度 谷歌之。
4.服务器端采用VS建立一个网站，新建一个页面androidtest.aspx 
源码：

view sourceprint?
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protected void Page_Load(object sender, EventArgs e)
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{
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if (Request["jsonString"] != null)
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{
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string json = Request["jsonString"].ToString().Trim();
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json = HttpUtility.UrlDecode(json);
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try
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{
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string str = json.Substring(0, json.Length - 1);//去掉最后一个]
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str = str.Substring(1);//去掉第一个[
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string[] sArray = Regex.Split(str, "},");
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JavaScriptSerializer jss = new JavaScriptSerializer();
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for (int i = 0; i < sArray.Length; i++)
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{
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if (i < sArray.Length - 1)
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{
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sArray[i] += "}";
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}
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ProductBillList list = jss.Deserialize<ProductBillList>(sArray[i]);
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Response.Write(list.location + list.name + "\n");
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}
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}
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catch
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{
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Response.Write("出现异常");
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}
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}
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else
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{
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Response.Write("接收数据失败");
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}
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}
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public class ProductBill
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{
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public List<ProductBillList> ProductBillLists { get; set; }
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}
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public class ProductBillList
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{
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public String name { get; set; }
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public String location { get; set; }
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}
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