我正在尝试向php文件发送POST请求，然后发送回用于用户名和密码身份验证的json消息。用我的代码我得到一个错误ArrayIndexOutOfBoundsException：length = 0;此行上的index = 0：
HttpGet get=new HttpGet(strings[0]);
在我的代码中，当单击登录按钮时，它会调用asyncTask类，然后运行该应用程序。它在我甚至可以测试代码之前崩溃但我不确定为什么。我是HttpClient的新手，所以请保持温柔。 这是我在asynctask类中的代码片段
public class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
private String name, pwd;
private LoginActivity loginActivity;
boolean bloggedIn;
public DownloadFilesTask(LoginActivity loginActivity,String name, String pwd){
this.loginActivity=loginActivity;
this.name=name;
this.pwd=pwd;
}
@Override
protected Void doInBackground(Void... voids) {
HttpClient httpClient=new DefaultHttpClient();
HttpGet get=new HttpGet();
try {
URI website=new URI("login.php");
get.setURI(website);
} catch (URISyntaxException e) {
e.printStackTrace();
}
HttpPost httpPost=new HttpPost("login.php");
List<NameValuePair> nameValuePairs=new ArrayList<NameValuePair>(2);
String result=null;
nameValuePairs.add(new BasicNameValuePair("name", name));
nameValuePairs.add(new BasicNameValuePair("password", pwd));
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
HttpResponse response = null; //error
try {
response = httpClient.execute(httpPost);
} catch (IOException e) {
e.printStackTrace();
}
HttpEntity entity=response.getEntity();
InputStream instream= null;
try {
instream = entity.getContent();
} catch (IOException e) {
e.printStackTrace();
}
result=convertStreamToString(instream);
try {
instream.close();
} catch (IOException e) {
e.printStackTrace();
}
if (Utility.isNotNull(name) && Utility.isNotNull(pwd)) {
RequestParams params = new RequestParams();
if (Utility.validate(name, pwd)) {
params.put("username", name);
params.put("password", pwd);
bloggedIn=true;
onPostExecute();
} else {
loginActivity.InvalidToast();
}
} else {
loginActivity.EmptyToast();
}
return null;
}
private String convertStreamToString(InputStream instream) {
BufferedReader reader=new BufferedReader(new InputStreamReader(instream));
StringBuilder sb=new StringBuilder();
String line=null;
try {
while ((line=reader.readLine())!=null){
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
instream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
protected void onPostExecute(){
if (bloggedIn=true) {
loginActivity.navigatetoMainActivity();
}else{
loginActivity.InvalidToast();
}
}
private static class Utility {
static Pattern pattern;
static Matcher matcher;
static Pattern pattern1;
static Matcher matcher1;
static String NAME_PATTERN="ABCDEF";
static String PWD_PATTERN="ghijkl";
public static boolean validate(String name,String pwd){
pattern=Pattern.compile(NAME_PATTERN);
pattern1=Pattern.compile(PWD_PATTERN);
matcher=pattern.matcher(name);
matcher1=pattern1.matcher(pwd);
return matcher.matches()&& matcher1.matches();
}
public static boolean isNotNull(String name) {
return name!=null && name.trim().length()>0 ? true: false;
}
}
}
答案 0 :(得分：0)
更好地以这种方式使用我给出了两种从Web服务获得响应的方法。
package com.example.testdemo;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.Settings.Global;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.JsonHttpResponseHandler;
import com.loopj.android.http.RequestParams;
public class MainActivity extends Activity {
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
String resp;
public static String URL = "http://"here your server url other wise locatl path set"/service/service/login";
String[] datafield, datavalue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// GetLogin();
datafield = new String[] { "username", "password" };
datavalue = new String[] { "hardik", "Parmar" }; // here set your edittext value
new getServices().execute();
}
private class getServices extends AsyncTask<String, Void, Void> {
private ProgressDialog Dialog = new ProgressDialog(MainActivity.this);
protected void onPreExecute() {
Dialog.setMessage("Please Wait...");
Dialog.show();
}
@Override
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
try {
resp = postData(URL, datafield, datavalue);
Log.e("SignUp", "Response : " + resp);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Dialog.dismiss();
try {
JSONObject jsonObj = new JSONObject(resp);
Log.e("get the JSON RESPONCES ", ": :: : : :: : : " + jsonObj);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void GetLogin() {
// TODO Auto-generated method stub
params.put("username", "hardik");
params.put("password", "Parmar");
client.post(URL, params,
new JsonHttpResponseHandler() {
@Override
public void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.e("Services ", "On start");
}
@Override
public void onFailure(int statusCode, Header[] headers,
Throwable throwable, JSONArray errorResponse) {
// TODO Auto-generated method stub
super.onFailure(statusCode, headers, throwable,
errorResponse);
Log.e("Services ", "On failure Array " + errorResponse);
}
@Override
public void onSuccess(int statusCode, Header[] headers,
JSONObject response) {
// TODO Auto-generated method stub
super.onSuccess(statusCode, headers, response);
Log.e("Services ", "On Sucess " + response);
}
@Override
public void onFinish() {
// TODO Auto-generated method stub
super.onFinish();
Log.e("Services ", "On finish");
}
@Override
public void onFailure(int statusCode, Header[] headers,
Throwable throwable, JSONObject errorResponse) {
// TODO Auto-generated method stub
super.onFailure(statusCode, headers, throwable,
errorResponse);
Log.e("Services ", "On faulure Json Object "
+ errorResponse);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static String postData(String mUrl, String[] datafield,
String[] datavalue) {
// TODO Auto-generated method stub
String respStr = null;
try {
JSONObject json = new JSONObject();
if (datafield != null) {
for (int i = 0; i < datavalue.length; i++) {
json.put(datafield[i], datavalue[i]);
}
}
Log.e("json", "" + json);
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(mUrl);
post.setHeader("content-type", "application/json; charset=UTF-8");
StringEntity entity = new StringEntity(json.toString());
post.setEntity(entity);
HttpResponse resp = httpClient.execute(post);
respStr = EntityUtils.toString(resp.getEntity());
} catch (Throwable t) {
}
return respStr;
}
}
AsyncHttpClient这是获取响应表单服务器的库。 GetLogin（）方法正在使用AsyncHttpClient。我总是使用这种方法。
并且在你身边可能是错误的