Android 如何从服务器接收回JSON数据?
我正在使用以下代码向服务器发送数据:Android 如何从服务器接收回JSON数据?,android,json,url,post,Android,Json,Url,Post,我正在使用以下代码向服务器发送数据: HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(URL); try { HttpResponse response = httpclient.execute(httppost); } catch (ClientProtocolException e) { // TODO Auto-
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
try {
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
服务器向我发送JSON作为响应,我如何收集发送回我的数据
谢谢
谢谢我用另一种方式做了这件事,但它很有效:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
ResponseHandler<String> res = new BasicResponseHandler();
String response = "";
try {
// reponse string contains all the json data
response = httpclient.execute(httppost,res);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
HttpClient-HttpClient=newdefaulthttpclient();
HttpPost HttpPost=新的HttpPost(URL);
ResponseHandler res=新的BasicResponseHandler();
字符串响应=”;
试一试{
//响应字符串包含所有json数据
response=httpclient.execute(httppost,res);
}捕获(客户端协议例外e){
//TODO自动生成的捕捉块
}捕获(IOE异常){
//TODO自动生成的捕捉块
}
这可能很有用
public class RestClient {
public enum RequestMethod {
GET,
POST
}
private ArrayList <NameValuePair> params;
private ArrayList <NameValuePair> headers;
private String url;
private int responseCode;
private String message;
private String response;
public String getResponse() {
return response;
}
public String getErrorMessage() {
return message;
}
public int getResponseCode() {
return responseCode;
}
public RestClient(String url)
{
this.url = url;
params = new ArrayList<NameValuePair>();
headers = new ArrayList<NameValuePair>();
}
public void AddParam(String name, String value)
{
params.add(new BasicNameValuePair(name, value));
}
public void AddHeader(String name, String value)
{
headers.add(new BasicNameValuePair(name, value));
}
public void Execute(RequestMethod method) throws Exception
{
switch(method) {
case GET:
{
//add parameters
String combinedParams = "";
if(!params.isEmpty()){
combinedParams += "?";
for(NameValuePair p : params)
{
String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
if(combinedParams.length() > 1)
{
combinedParams += "&" + paramString;
}
else
{
combinedParams += paramString;
}
}
}
HttpGet request = new HttpGet(url + combinedParams);
//add headers
for(NameValuePair h : headers)
{
request.addHeader(h.getName(), h.getValue());
}
executeRequest(request, url);
break;
}
case POST:
{
HttpPost request = new HttpPost(url);
//add headers
for(NameValuePair h : headers)
{
request.addHeader(h.getName(), h.getValue());
}
JSONObject jo = new JSONObject();
if(!params.isEmpty()){
for (int i = 0; i < params.size();i++)
{
jo.put(params.get(i).getName(),params.get(i).getValue());
}
StringEntity se = new StringEntity(jo.toString());
se.setContentType("text/xml");
se.setContentEncoding( new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
request.setEntity(se);
//request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
}
executeRequest(request, url);
break;
}
}
}
private void executeRequest(HttpUriRequest request, String url)
{
//HttpClient client = new DefaultHttpClient();
HttpClient client = HttpClientFactory.getThreadSafeClient();
HttpResponse httpResponse;
try {
httpResponse = client.execute(request);
responseCode = httpResponse.getStatusLine().getStatusCode();
message = httpResponse.getStatusLine().getReasonPhrase();
HttpEntity entity = httpResponse.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
response = convertStreamToString(instream);
// Closing the input stream will trigger connection release
instream.close();
}
} catch (ClientProtocolException e) {
client.getConnectionManager().shutdown();
e.printStackTrace();
} catch (IOException e) {
client.getConnectionManager().shutdown();
e.printStackTrace();
}
}
private static String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
现在,您只需使用:
RestClient c = new RestClient("http://somewebsite.com/register");
c.AddHeader("Accept", "application/json");
c.AddHeader("Content-type", "application/json");
c.AddParam("UserName", user);
c.AddParam("Password", password);
c.Execute(RequestMethod.POST);
JSONObject userKey = new JSONObject(c.getResponse());
现在,您有了一组线程安全、易于使用的类,可以用来调用服务和提取JSON数据。如果您使用的是JSON,下面的链接可能会帮助您检查此链接-
RestClient c = new RestClient("http://somewebsite.com/register");
c.AddHeader("Accept", "application/json");
c.AddHeader("Content-type", "application/json");
c.AddParam("UserName", user);
c.AddParam("Password", password);
c.Execute(RequestMethod.POST);
JSONObject userKey = new JSONObject(c.getResponse());