Android Json结果返回null
我是Android新手。我想从本地主机获取数据Android Json结果返回null,android,json,Android,Json,我是Android新手。我想从本地主机获取数据 String cus_id = etcusid.getText().toString(); new cusdataAsynTask().execute(cus_id); public class cusdataAsynTask extends AsyncTask<String, Void, Void> { @Override protected Void doInBackground(String... params)
String cus_id = etcusid.getText().toString();
new cusdataAsynTask().execute(cus_id);
public class cusdataAsynTask extends AsyncTask<String, Void, Void> {
@Override
protected Void doInBackground(String... params) {
String nvpcusid = params[0];
List<NameValuePair> arg = new ArrayList<NameValuePair>();
Log.e("nvpcusid: ", "> " + nvpcusid);
arg.add(new BasicNameValuePair("cus_id", nvpcusid));
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_CUSTOMERDATA,
ServiceHandler.GET,arg);
Log.e("Response: ", "> " + json);
}
}
String cus_id=etcusid.getText().toString();
新建cusdataAsynTask().execute(cus_id);
公共类cusdataAsynTask扩展异步任务{
@凌驾
受保护的Void doInBackground(字符串…参数){
字符串nvpcusid=params[0];
List arg=new ArrayList();
Log.e(“nvpcusid:”,“>”+nvpcusid);
参数添加(新的BasicNameValuePair(“客户id”,nvpcusid));
ServiceHandler jsonParser=新ServiceHandler();
字符串json=jsonParser.makeServiceCall(URL\u CUSTOMERDATA,
获取,arg);
Log.e(“响应:”,“>”+json);
}
}
在日志中,我得到的响应为null
下面给出了服务处理程序类
public class ServiceHandler {
static InputStream is = null;
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
public ServiceHandler() {
}
/*
* Making service call
* @url - url to make request
* @method - http request method
* */
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
/*
* Making service call
* @url - url to make request
* @method - http request method
* @params - http request params
* */
public String makeServiceCall(String url, int method,
List<NameValuePair> params) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
httpPost.setEntity(new UrlEncodedFormEntity(params));
}
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
response = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error: " + e.toString());
}
return response;
}
公共类ServiceHandler{
静态InputStream为空;
静态字符串响应=null;
公共最终静态int GET=1;
公共最终静态int POST=2;
公共服务处理程序(){
}
/*
*拨打服务电话
*@url-发出请求的url
*@method-http请求方法
* */
公共字符串makeServiceCall(字符串url,int方法){
返回此.makeServiceCall(url,方法,null);
}
/*
*拨打服务电话
*@url-发出请求的url
*@method-http请求方法
*@params-http请求参数
* */
公共字符串makeServiceCall(字符串url,int方法,
列表参数){
试一试{
//http客户端
DefaultHttpClient httpClient=新的DefaultHttpClient();
HttpEntity HttpEntity=null;
HttpResponse HttpResponse=null;
//检查http请求方法类型
if(方法==POST){
HttpPost HttpPost=新的HttpPost(url);
//添加post参数
如果(参数!=null){
setEntity(新的UrlEncodedFormEntity(参数));
}
httpResponse=httpClient.execute(httpPost);
}else if(方法==GET){
//将参数附加到url
如果(参数!=null){
String paramString=URLEncodedUtils
.格式(参数“utf-8”);
url+=“?”+参数字符串;
}
HttpGet HttpGet=新的HttpGet(url);
httpResponse=httpClient.execute(httpGet);
}
httpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}捕获(不支持的编码异常e){
e、 printStackTrace();
}捕获(客户端协议例外e){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(
为“UTF-8”)、8);
StringBuilder sb=新的StringBuilder();
字符串行=null;
而((line=reader.readLine())!=null){
sb.追加(第+行“\n”);
}
is.close();
response=sb.toString();
}捕获(例外e){
Log.e(“缓冲区错误”,“错误:+e.toString());
}
返回响应;
}
}
我是这方面的初学者,请帮帮我 请尝试以下代码:
该类用于从服务器获取jsonObject和jsonArray:
public class GetDataJsonFromServer {
public static JSONObject postJSONfromURL(String url,
List<NameValuePair> params, int socketFactory, String userAgent)
throws SSLPeerUnverifiedException {
InputStream is = null;
String result = "";
JSONObject jArray = null;
try {
SchemeRegistry scheme = new SchemeRegistry();
scheme.register(new Scheme("http", PlainSocketFactory
.getSocketFactory(), socketFactory));
HttpClient httpclient = new DefaultHttpClient();
HttpProtocolParams.setUserAgent(httpclient.getParams(), userAgent);
HttpPost httpost = new HttpPost(url);
HttpResponse response = httpclient.execute(httpost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
}
try {
jArray = new JSONObject(result);
} catch (JSONException e) {
}
return jArray;
}
public static JSONArray mygetJSONfromURL(String url,
List<NameValuePair> params, int socketFactory, String userAgent)
throws SSLPeerUnverifiedException {
InputStream is = null;
String result = "";
JSONArray jArray = null;
try {
SchemeRegistry scheme = new SchemeRegistry();
scheme.register(new Scheme("http", PlainSocketFactory
.getSocketFactory(), socketFactory));
HttpClient httpclient = new DefaultHttpClient();
HttpProtocolParams.setUserAgent(httpclient.getParams(), userAgent);
String paramString = URLEncodedUtils.format(params, "utf-8");
HttpGet httpget = new HttpGet(url + paramString);
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
}
try {
jArray = new JSONArray(result);
} catch (JSONException e) {
}
return jArray;
}
public static JSONObject getJSONfromURL(String url,
List<NameValuePair> params, int socketFactory, String userAgent)
throws SSLPeerUnverifiedException {
InputStream is = null;
String result = "";
JSONObject jArray = null;
try {
SchemeRegistry scheme = new SchemeRegistry();
scheme.register(new Scheme("http", PlainSocketFactory
.getSocketFactory(), socketFactory));
HttpClient httpclient = new DefaultHttpClient();
HttpProtocolParams.setUserAgent(httpclient.getParams(), userAgent);
String paramString = URLEncodedUtils.format(params, "utf-8");
HttpGet httpget = new HttpGet(url + paramString);
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
}
try {
jArray = new JSONObject(result);
} catch (JSONException e) {
}
return jArray;
}
}
公共类GetDataJsonFromServer{
公共静态JSONObject postJSONfromURL(字符串url,
列表参数、int socketFactory、字符串userAgent)
抛出SSLPeerUnverifiedException{
InputStream=null;
字符串结果=”;
JSONObject jArray=null;
试一试{
SchemeRegistry scheme=新SchemeRegistry();
scheme.register(新方案(“http”),PlainSocketFactory
.getSocketFactory(),socketFactory));
HttpClient HttpClient=新的DefaultHttpClient();
HttpProtocolParams.setUserAgent(httpclient.getParams(),userAgent);
HttpPost HttpPost=新的HttpPost(url);
HttpResponse response=httpclient.execute(httpost);
HttpEntity=response.getEntity();
is=entity.getContent();
}捕获(例外e){
}
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(
为“utf-8”)、8);
StringBuilder sb=新的StringBuilder();
字符串行=null;
而((line=reader.readLine())!=null){
sb.追加(第+行“\n”);
}
is.close();
结果=sb.toString();
}捕获(例外e){
}
试一试{
jArray=新的JSONObject(结果);
}捕获(JSONException e){
}
返回jArray;
}
公共静态JSONArray mygetJSONfromURL(字符串url,
列表参数、int socketFactory、字符串userAgent)
抛出SSLPeerUnverifiedException{
InputStream=null;
字符串结果=”;
JSONArray-jArray=null;
试一试{
SchemeRegistry scheme=新SchemeRegistry();
scheme.register(新方案(“http”),PlainSocketFactory
.getSocketFactory(),socketFactory));
HttpClient HttpClient=新的DefaultHttpClient();
HttpProtocolParams.setUserAgent(httpclient.getParams(),userAgent);
String paramString=URLEncodedUtils.format(params,“utf-8”);
HttpGet HttpGet=新的HttpGet(url+paramString);
HttpResponse response=httpclient.execute(httpget);
HttpEntity=response.getEntity();
is=entity.getContent();
}捕获(例外e){
}
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(
是“utf-8”)
public class cusdataAsynTask extends AsyncTask<String, Void, jsonObject> {
@Override
protected Void doInBackground(String... params) {
List<NameValuePair> listParams = new ArrayList<NameValuePair>();
JSONObject josn = new JSONObject();
String url = params[0];
Log.w("url", url);
try {
josn = GetDataJsonFromServer.postJSONfromURL(url, listParams,
80, "Bazan version for Android");
} catch (SSLPeerUnverifiedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return josn;
}
@Override
protected void onPostExecute(JSONObject result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (result != null) {
// add your code here
}
}
}
private void get_valueFromServer(String php) {
String responseString = null;
try{
HttpClient httpclient = new DefaultHttpClient();
String url ="your_url";
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.getEntity().writeTo(out);
out.close();
responseString = out.toString();
// The result is here, in response string
Toast.makeText(getApplicationContext(),responseString,1000).show();
} catch(Exception e) {
}
}