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我有一个 php 文件，它以 json 格式将以下内容返回给 android：

[
   {
      "IDpost":"1",
      "username":"you",
      "FirstN":"Mounzer",
      "LastN":"Yaghi",
      "Content":"test1",
      "Type":"CARS",
      "Dateofp":"2013-03-03"
   },
   {
      "IDpost":"2",
      "username":"boss",
      "FirstN":"Marwan",
      "LastN":"Geha",
      "Content":"test2",
      "Type":"CARS",
      "Dateofp":"2013-03-05"
   },
   {
      "IDpost":"4",
      "username":"boss",
      "FirstN":"Marwan",
      "LastN":"Geha",
      "Content":"hello this is getting boring",
      "Type":"CARS",
      "Dateofp":"2000-02-02"
   }
]

我想要做的是在其中一些信息中填充一个列表视图，但由于一些 json 异常，它不起作用，这是我的 java 代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class Posts extends Activity {
    String type, firstname, lastname, email, number, username, content; 
    HttpClient httpclient;
    HttpPost httppost;
    ArrayList<NameValuePair> nameValuePairs;
    HttpResponse response;
    HttpEntity entity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.addpost);

        Bundle gotBasket = getIntent().getExtras();
        type = gotBasket.getString("type_post");
        firstname = gotBasket.getString("fn");
        lastname = gotBasket.getString("ln");
        email = gotBasket.getString("pemail");
        number = gotBasket.getString("number");
        username = gotBasket.getString("user");

        this.setTitle(type);

        Button addp = (Button) findViewById(R.id.addpost1);
        addp.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Bundle basket = new Bundle();
                basket.putString("user", username);
                basket.putString("fn", firstname);
                basket.putString("ln", lastname);
                basket.putString("number", number);
                basket.putString("pemail", email);
                basket.putString("type_post", type);

                Intent a = new Intent(Posts.this, Addpost_2.class);
                a.putExtras(basket);
                startActivity(a);       
            }
        });

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

         httpclient = new DefaultHttpClient();
         httpclient = new DefaultHttpClient();
         httppost = new HttpPost("http://192.168.1.38/LTC/Uploadposts.php?type=" + type + "");
         try {
             nameValuePairs = new ArrayList<NameValuePair>();
             nameValuePairs.add(new BasicNameValuePair("type",type));
             nameValuePairs.add(new BasicNameValuePair("FirstN",firstname));
             nameValuePairs.add(new BasicNameValuePair("LastN",lastname));
             nameValuePairs.add(new BasicNameValuePair("Content",content));

             httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
             response = httpclient.execute(httppost);

             if (response.getStatusLine().getStatusCode() == 200) {
                 entity = response.getEntity();
                 if (entity != null) {
                     InputStream instream = entity.getContent();
                     JSONObject jsonResponse = new JSONObject(convertStreamToString(instream));
                     //Toast.makeText(getBaseContext(),jsonResponse.toString(),Toast.LENGTH_LONG).show();
                     String retUser = jsonResponse.getString("username");
                     String retcont = jsonResponse.getString("Content");
                     String getf = jsonResponse.getString("FirstN");
                     String getl = jsonResponse.getString("LastN");
                     String dop = jsonResponse.getString("Dateofp");

                     try {
                         JSONArray jArray = new JSONArray(convertStreamToString(instream));

                         int jArrayLength = jArray.length();
                         List<String> listContents = new ArrayList<String>(jArrayLength);

                         for (int i = 0; i < jArray.length(); i++){
                             JSONObject json_data = jArray.getJSONObject(i);
                             listContents.add(json_data.getString("FirstN") + " "
                                         + json_data.getString("LastN") + " "
                                         + json_data.getString("Dateofp")
                                         + "\n\n" +json_data.getString("Content"));
                         }

                         ListView myListView = (ListView) findViewById(R.id.listView2);
                         myListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listContents));

                     } catch(JSONException e) {
                         Log.e("log_tag","Error parsin data "+e.toString());
                     }
                 }
             }
         } catch(Exception e) {
             Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show(); 
         }
     }

     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();
     }
 }

我知道错误在我的java代码中，谁能帮助我并告诉我应该在代码中更改什么，谢谢

4

2 回答 2

0

在不知道你得到的确切异常的情况下，我猜你必须new JSONObject(convertStreamToString(instream));用 new替换，JSONArray(convertStreamToString(instream));因为你的 PHP 返回一个数组，而不是一个对象。

于 2013-03-11T20:44:27.657 回答
0 
      public static JSONObject retrieveJsonObjectFromUrl(URL url)
        throws JSONException, IOException {
    HttpURLConnection connection = null;
    StringBuilder jsonResults = new StringBuilder();

    try {
        if (url != null) {
            connection = (HttpURLConnection) url.openConnection();
            connection.setReadTimeout(10000);
            connection.setConnectTimeout(10000);

            InputStreamReader in = new InputStreamReader(
                    connection.getInputStream());

            int read;
            char[] buff = new char[1024];
            while ((read = in.read(buff)) != -1) {

                jsonResults.append(buff, 0, read);
            }
        }
    } catch (MalformedURLException e) {
        Log.e("Invalid URL", "Error processing ", e);
        return null;
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
    }
    return new JSONObject(jsonResults.toString());
}
于 2013-03-11T20:47:05.073 回答