java Android json获取问题WCF服务
我已经在localhost上创建了一个WCF服务，它会在调用时返回一个json。我想在安卓客户端上获取json，但不知怎么的，它不起作用。我尝试从一个示例安卓教程网站获取一个json，但我自己的localhost WCF服务似乎不起作用
package com.example.usa;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import 安卓.app.Activity;
import 安卓.content.Intent;
import 安卓.os.Bundle;
import 安卓.os.Handler;
import 安卓.util.Log;
public class Home extends Activity {
// url to make request
private static String url = "http://localhost:8732/Design_Time_Addresses/WcfServiceLibrary/Service1/GetDataUsingDataContract";
//http://localhost:8732/Design_Time_Addresses/WcfServiceLibrary/Service1/
// JSON Node names
private static final String TAG_CONTACTS = "contacts";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_EMAIL = "email";
private static final String TAG_ADDRESS = "address";
private static final String TAG_GENDER = "gender";
private static final String TAG_PHONE = "phone";
private static final String TAG_PHONE_MOBILE = "mobile";
private static final String TAG_PHONE_HOME = "home";
private static final String TAG_PHONE_OFFICE = "office";
public static JSONObject json ;
JSONArray contacts = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
final ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
final JSONParser jParser = new JSONParser();
// getting JSON string from URL
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Thread thread = new Thread()
{
@Override
public void run() {
while(true) {
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// Getting Array of Contacts
contacts = json.getJSONArray(TAG_CONTACTS);
// looping through All Contacts
for(int i = 0; i < contacts.length(); i++){
JSONObject c = contacts.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String email = c.getString(TAG_EMAIL);
String address = c.getString(TAG_ADDRESS);
String gender = c.getString(TAG_GENDER);
// Phone number is agin JSON Object
JSONObject phone = c.getJSONObject(TAG_PHONE);
String mobile = phone.getString(TAG_PHONE_MOBILE);
String home = phone.getString(TAG_PHONE_HOME);
String office = phone.getString(TAG_PHONE_OFFICE);
Log.w("ID",id);
Log.w("Name",name);
Log.w("Email",email);
Log.w("Gender",gender);
Log.w("mobile",mobile);
Log.w("home",home);
Log.w("office",office);
Log.w("address",address);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
map.put(TAG_EMAIL, email);
map.put(TAG_PHONE_MOBILE, mobile);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
};
thread.start();
//
finish();
}
}, 0);
}
}
这个代码抛出了这个
10-04 13:31:30.402: D/dalvikvm(3043): GC_FOR_ALLOC freed 15K, 4% free 4157K/4292K, paused 39ms, total 48ms
10-04 13:31:30.422: I/dalvikvm-heap(3043): Grow heap (frag case) to 5.637MB for 1536016-byte allocation
10-04 13:31:30.592: D/dalvikvm(3043): GC_FOR_ALLOC freed <1K, 3% free 5656K/5796K, paused 160ms, total 160ms
10-04 13:31:32.562: W/System.err(3043): org.apache.http.conn.HttpHostConnectException: Connection to http://localhost:8732 refused
10-04 13:31:32.592: W/System.err(3043): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
10-04 13:31:32.592: W/System.err(3043): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-04 13:31:32.602: W/System.err(3043): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-04 13:31:32.602: W/System.err(3043): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-04 13:31:32.602: W/System.err(3043): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-04 13:31:32.602: W/System.err(3043): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-04 13:31:32.643: W/System.err(3043): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-04 13:31:32.643: W/System.err(3043): at com.example.usa.JSONParser.getJSONFromUrl(JSONParser.java:38)
10-04 13:31:32.643: W/System.err(3043): at com.example.usa.Home$1$1.run(Home.java:66)
10-04 13:31:32.643: W/System.err(3043): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 8732): connect failed: ECONNREFUSED (Connection refused)
10-04 13:31:32.682: W/System.err(3043): at libcore.io.IoBridge.connect(IoBridge.java:114)
10-04 13:31:32.712: W/System.err(3043): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
10-04 13:31:32.712: W/System.err(3043): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
10-04 13:31:32.733: W/System.err(3043): at java.net.Socket.connect(Socket.java:842)
10-04 13:31:32.733: W/System.err(3043): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
10-04 13:31:32.733: W/System.err(3043): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
10-04 13:31:32.742: W/System.err(3043): ... 8 more
10-04 13:31:32.772: W/System.err(3043): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
10-04 13:31:32.812: W/System.err(3043): at libcore.io.Posix.connect(Native Method)
10-04 13:31:32.812: W/System.err(3043): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
10-04 13:31:32.812: W/System.err(3043): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
10-04 13:31:32.812: W/System.err(3043): at libcore.io.IoBridge.connect(IoBridge.java:112)
10-04 13:31:32.812: W/System.err(3043): ... 13 more
10-04 13:31:32.854: E/Buffer Error(3043): Error converting result java.lang.NullPointerException: lock == null
10-04 13:31:32.917: E/JSON Parser(3043): Error parsing data org.json.JSONException: End of input at character 0 of
10-04 13:31:32.917: W/dalvikvm(3043): threadid=11: thread exiting with uncaught exception (group=0x414c4700)
10-04 13:31:32.917: E/AndroidRuntime(3043): FATAL EXCEPTION: Thread-96
10-04 13:31:32.917: E/AndroidRuntime(3043): java.lang.NullPointerException
10-04 13:31:32.917: E/AndroidRuntime(3043): at com.example.usa.Home$1$1.run(Home.java:70)
10-04 13:31:35.052: I/Choreographer(3043): Skipped 1034 frames! The application may be doing too much work on its main thread.
10-04 13:31:38.592: I/Choreographer(3043): Skipped 37 frames! The application may be doing too much work on its main thread.
10-04 13:36:33.602: I/Process(3043): Sending signal. PID: 3043 SIG: 9
# 1 楼答案
首先，您必须在IIS an中部署服务，而不是将localhost更改为10.0.2.2:Yourport