这是logcat
D/request!(1826): [mtd=empLog, request[cmp_id]=, request[user_name]=sureshsk_cepl, request[password]=ceplvalrep2014, request[remember]=1, Phone_type=Android]
I/Choreographer(1826): Skipped 39 frames! The application may be doing too much work on its main thread.
I/art(1826): Background sticky concurrent mark sweep GC freed 1612(81KB) AllocSpace objects, 0(0B) LOS objects, 19% free, 829KB/1026KB, paused 4.407ms total 114.250ms
W/System.err(1826): org.apache.http.conn.HttpHostConnectException: Connection to http://localhost refused
W/System.err(1826): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
W/System.err(1826): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
W/System.err(1826): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
W/System.err(1826): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
W/System.err(1826): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
W/System.err(1826): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
W/System.err(1826): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
W/System.err(1826): at com.cepl.valrep.adapter.JSONParser.makeHttpRequest(JSONParser.java:52)
W/System.err(1826): at com.cepl.valrep.MainActivity$Login.doInBackground(MainActivity.java:120)
W/System.err(1826): at com.cepl.valrep.MainActivity$Login.doInBackground(MainActivity.java:1)
W/System.err(1826): at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err(1826): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err(1826): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err(1826): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err(1826): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err(1826): at java.lang.Thread.run(Thread.java:818)
W/System.err(1826): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 80): connect failed: ECONNREFUSED (Connection refused)
W/System.err(1826): at libcore.io.IoBridge.connect(IoBridge.java:124)
W/System.err(1826): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
W/System.err(1826): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
W/System.err(1826): at java.net.Socket.connect(Socket.java:882)
W/System.err(1826): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
W/System.err(1826): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
W/System.err(1826): ... 15 more
W/System.err(1826): Caused by: android.system.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
W/System.err(1826): at libcore.io.Posix.connect(Native Method)
W/System.err(1826): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
W/System.err(1826): at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
W/System.err(1826): at libcore.io.IoBridge.connect(IoBridge.java:122)
W/System.err(1826): ... 20 more
E/Buffer Error(1826): Error converting result java.lang.NullPointerException: lock == null
E/JSON Parser(1826): Error parsing data org.json.JSONException: End of input at character 0 of
W/System.err(1826): java.lang.NullPointerException: Attempt to invoke virtual method 'int org.json.JSONObject.getInt(java.lang.String)' on a null object reference
W/System.err(1826): at com.cepl.valrep.MainActivity$Login.doInBackground(MainActivity.java:126)
W/System.err(1826): at com.cepl.valrep.MainActivity$Login.doInBackground(MainActivity.java:1)
W/System.err(1826): at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err(1826): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err(1826): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err(1826): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err(1826): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err(1826): at java.lang.Thread.run(Thread.java:818)
I/System.out(1826): Some error occurs
这是我的JAVA代码
public class MainActivity extends Activity implements OnClickListener{
private EditText Edit_UserName,Edit_Password;
private Button Login;
private RadioButton Remember;
TextView textview;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
JSONParser jsonParser = new JSONParser();
private static String url_login = "http://localhost/valrep/php/request.php?c=employee";
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
static String mtd;
static String cmp_id;
static String login_username;
static String login_password;
String remember="0";
AsyncTask<Void, Void, Void> mRegisterTask;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Edit_UserName = (EditText)findViewById(R.id.txtUserName);
Edit_Password = (EditText)findViewById(R.id.txtDate);
Login = (Button) findViewById(R.id.btnLogin);
Remember = (RadioButton)findViewById(R.id.btnCheckin);
textview = (TextView)findViewById(R.id.textView1);
// Remember.setOnClickListener(this);
Login.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnLogin:
login_username = Edit_UserName.getText().toString();
login_password = Edit_Password.getText().toString();
if (Remember.isChecked()) {
remember = "1";
}else {
remember = "0";
}
new Login().execute();
// httpclient=new DefaultHttpClient();
// httppost= new HttpPost(url_login);
}
}
class Login extends AsyncTask<String, String, String>{
boolean failure = false;
private JSONArray jsonarray=null;
@Override
protected String doInBackground(String... args) {
int success;
try{
nameValuePairs = new ArrayList<NameValuePair>();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("mtd", "empLog"));
params.add(new BasicNameValuePair("request[cmp_id]", ""));
params.add(new BasicNameValuePair("request[user_name]", login_username));
params.add(new BasicNameValuePair("request[password]", login_password));
params.add(new BasicNameValuePair("request[remember]", remember));
params.add(new BasicNameValuePair("Phone_type", "Android"));
// httppost.setEntity(new UrlEncodedFormEntity(params));
Log.d("request!", params.toString());
JSONObject json = jsonParser.makeHttpRequest(url_login, "POST", params);
// HttpResponse response = httpclient.execute(httppost);
//
// Log.d("request!",json.toString());
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Toast.makeText(getApplicationContext(), "Successfully loggedIn", Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(getApplicationContext(), "Wrong username or password", Toast.LENGTH_LONG).show();
}
}catch (Exception e) {
e.printStackTrace();
System.out.println("Some error occurs");
}
// TODO Auto-generated method stub
return null;
}
}
}
我的JSON解析器是
public class JSONParser
{
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity 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, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
//Log.d("response string",json);
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
答案 0 :(得分：1)
如果您在Android设备中使用localhost，则指的是实际设备，如果您要访问本地计算机，请使用您的LAN IP地址（如果您的设备已连接到LAN网络）或互联网IP如果没有。
另一方面，如果您使用的是Android模拟器，请将localhost更改为10.0.2.2。
PS：您可能错过了网址中的端口，具体取决于您配置服务器的方式。
应该做的伎俩
答案 1 :(得分：0)
json对象被指定为null，因为makeHttpRequest要么返回null，要么无法建立连接。
JSONObject json = jsonParser.makeHttpRequest(url_login, "POST", params);
因此，当您通过任何指向null的引用调用任何方法时，此行将抛出异常。
success = json.getInt(TAG_SUCCESS); // because json = null
答案 2 :(得分：0)
将localhost替换为localhost：您的侦听端口号（例如：8080）
如果您在模拟器中运行您的应用 将localhost替换为10.0.2.2：您的侦听端口号