我试图找出为什么我的输入流无法正常工作。我正在尝试连接到服务器并获取 JSON 字符串并将其保存到变量 inputJSON 中。但是 inputJOSN 是空的，因为我的输入流无法正常工作。这行代码:
inputJSON = ConvertByteArrayToString(getBytesFromInputStream(inputStr));
似乎无法正常工作，我不确定为什么？
public class AndroidClient extends ProfileActivity {
private TextView textIn;
public Thread rt;
public Socket socket = null;
public PrintWriter outputstrwr;
public OutputStream out = null;
public DataOutputStream dataOutputStream = null;
public DataInputStream dataInputStream = null;
public InputStream inputStr = null;
private final static String LOG_TAG = AndroidClient.class.getSimpleName();
private final Handler handler = new Handler();
private List<Profile> serviceInfoList = new ArrayList<Profile>();
// Map between list position and profile
private Map<Integer, Profile> posMap = new HashMap<Integer, Profile>();
private Map<String, Integer> addressMap = new HashMap<String, Integer>();
private static String profilePicBase64Str="";
private String inputJSON = "";
private String outputJSON = "";
private String outputJSONserv = "";
private Profile p;
//String urlInputStream = "";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.e(LOG_TAG, "Before OnCreate() Try");
try {
Log.e(LOG_TAG, "In OnCreate() Try");
socket = new Socket("23.23.175.213", 9000); //Port 1337
Log.e(LOG_TAG, "Created Socket");
dataOutputStream = new DataOutputStream(socket.getOutputStream());
Log.e(LOG_TAG, "Created DataOutputStream");
dataInputStream = new DataInputStream(socket.getInputStream());
Log.e(LOG_TAG, "Created DataInputStream");
//out = new OutputStream();
out = socket.getOutputStream();
inputStr = socket.getInputStream();
//Thread readjsonthrd = new Thread(new ReadJSONThread());
//inputstrrd = new InputStreamReader(socket.getInputStream());
p = new Profile();
Log.e(LOG_TAG, "Created Profile Instance");
//Gets the local profile via JSON and converts into Profile type
Gson gson = new Gson();
Log.e(LOG_TAG, "Created Gson Instance" + "GetProfileJSONStr:" + p.getProfileJSONStr());
p = gson.fromJson(p.getProfileJSONStr(), Profile.class);
setProfile(p);
Log.e(LOG_TAG, "Converted Profile to JSON");
//Gson gson = new Gson();
Log.e(LOG_TAG, "Before: outputJSON = gson.toJson(p);");
outputJSON = gson.toJson(p).toString();
outputJSON = removeExcessStr(outputJSON);
Log.e(LOG_TAG, "ProfilePicStr Base64:"+p.getProfilePicStr());
outputJSON = outputJSON.replace("Name","name");
outputJSON = outputJSON.replace("TagLine","message");
outputJSON = outputJSON.replace("Title","title");
outputJSON = outputJSON.replace("Company", "company");
outputJSON = outputJSON.replace("Industry","industry");
outputJSON = outputJSON.replace("WhatIDo","whatido");
outputJSON = outputJSON.replace("WhoDoIWantToMeet","meetwho");
outputJSON = outputJSON.replace("WHOOZNEAR_PROFILEPIC","photo");
outputJSON = outputJSON.replaceAll("[c][o][n][t][e][n][t][:][/][/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+", getPicBase64Str()); /*"helloworld2"*/
if (!outputJSON.contains(",\"photo\":")) {
outputJSON = outputJSON.replace("}",",\"photo\":"+"\"IconnexUs\"}");
outputJSON = outputJSON.replace("}",",\"photo\":"+"\""+getPicBase64Str()+"\"}");
outputJSON = outputJSON.replace("}",",\"status\":\"enabled\"}");
}
else {
outputJSON = outputJSON.replace("}",",\"status\":\"enabled\"");
}
outputJSONserv = "{\"to\":\"broadcast\",\"type\":\"1\",\"payload\":"+outputJSON+"}";
Log.e(LOG_TAG, "Created outputJSON:" + outputJSON);
Log.e(LOG_TAG, "Created outputJSON Server:" + outputJSONserv);
JSONObject outObject = new JSONObject();
try {
outObject.put("photo", "hello");
outObject.put("type", "50");
outObject.put("payload", outputJSON);
outputJSON = gson.toJson(outObject).toString();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "Value of PROFILEPIC STRING FROM PROFILEMAP: "+profileMap.get("WHOOZNEAR_PROFILEPIC"));
p.setProfilePicStr(ConvertandSetImagetoBase64(profileMap.get("WHOOZNEAR_PROFILEPIC")));
//String headerJSON = gson.toJson(outObject).toString();
outputJSON = outputJSON.substring(nthOccurrence(outputJSON, '{', 2)-1, nthOccurrence(outputJSON, '}', 1)-1);
String input = "["+"Ryan"+"[";
//"[foo".replaceAll(Pattern.quote("["), "\"");
String result = input.replaceAll(Pattern.quote("["), "\"");
Log.e(LOG_TAG, "REGEX REPLACEALL:"+result);
outputstrwr = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()), true);
outputstrwr.write(outputJSONserv);
Log.e(LOG_TAG, "Base64 String:"+p.getProfilePicStr());
Log.e(LOG_TAG, "Sent dataOutputStream");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "Before initEventHandlers");
initEventHandlers();
Log.e(LOG_TAG, "After initEventHandlers");
//refreshViewModels();
Log.e(LOG_TAG, "Start Repeat Thread");
rt = new Thread(new RepeatingThread());
rt.start();
Log.e(LOG_TAG, "Started Repeat Thread");
}
@Override
public void onDestroy() {
super.onDestroy();
rt.stop();
try {
socket.close();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onPause(){
super.onPause();
rt.stop();
}
@Override
public void onResume(){
super.onResume();
if (rt.isAlive() == false) {
//rt.start();
}
}
@Override
public void onStop(){
super.onStop();
rt.stop();
try {
socket.close();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String removeExcessStr(String json_excess) {
//String myString = myString.replace("=\"ppshein\"", "");
String json_excess1 = json_excess.replace("\"nameValues\":{", "");
String myString = json_excess1.replace(",\"profileId\":1,\"valid\":false}", "");
return myString;
}
public static String adddblquotattr(String attr) {
String result = attr.replaceAll(Pattern.quote("["), "\"");
return result;
}
public static String adddblquotval(String val) {
String result = val.replaceAll(Pattern.quote("["), "\"");
return result;
}
public static int nthOccurrence(String str, char c, int n) {
int pos = str.indexOf(c, 0);
while (n-- > 0 && pos != -1)
pos = str.indexOf(c, pos+1);
return pos;
}
public void setPicBase64Str(String profilePicBase64Str) {
this.profilePicBase64Str = profilePicBase64Str;
}
public String getPicBase64Str() {
return profilePicBase64Str;
}
public String ConvertandSetImagetoBase64(String imagePath) {
String base64 = null;
byte[] input = null;
try{
FileInputStream fd = new FileInputStream(imagePath);
Bitmap bmt = BitmapFactory.decodeFileDescriptor(fd.getFD());
try{
ByteArrayOutputStream stream = new ByteArrayOutputStream();
Bitmap tmp = ProfileActivity.scaleDownBitmap(bmt, 10, this);
tmp.compress(Bitmap.CompressFormat.JPEG, 10, stream);
input = stream.toByteArray();
base64 = Base64.encodeToString(input, Base64.DEFAULT);
//LocalProfileActivity.input = input;
}catch(Exception e){
Log.e(LOG_TAG,"[ONACTIVITYRESULT] Could not bind input to the bytearray: " + e.getMessage());
}
}
catch (Exception e){
Log.e("LocalProfile", "ConvertandSetImagetoBase64: Could not load selected profile image");
}
return base64;
}
public String getStringFromBuffer(InputStreamReader inputstrread){
BufferedReader bRead = new BufferedReader(inputstrread);
String line = null;
StringBuffer jsonText = new StringBuffer();
try {
while((line=bRead.readLine())!=null){
jsonText.append(line);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonText.toString();
}
public String ConvertByteArrayToString(byte[] b) {
// byte[] to string
String input = new String(b);
return input;
}
public byte[] ConvertStringToByteArray(String str) {
// string to byte[]
byte[] bytes = str.getBytes();
return bytes;
}
public static byte[] getBytesFromInputStream(InputStream is)
throws IOException {
// Get the size of the file
long length = is.available();
if (length > Integer.MAX_VALUE) {
// File is too large
}
// Create the byte array to hold the data
byte[] bytes = new byte[(int) length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely stream ");
}
// Close the input stream and return bytes
is.close();
return bytes;
}
public static String writeFile(Bitmap finalBitmap) {
String filePath = "";
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream outFile = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outFile);
outFile.flush();
outFile.close();
} catch (Exception e) {
e.printStackTrace();
}
filePath = root+"/saved_images/"+fname;
return filePath;
}
public class RepeatingThread implements Runnable {
private final Handler mHandler = new Handler();
private int len = 0;
private byte[] input = new byte[len];
public RepeatingThread() {
//try {
Log.e(LOG_TAG, "Before inputJSON String");
//inputJSON = dataInputStream.readUTF();
//URL url = new URL("tcp://23.23.175.213:1337");
//inputJSON = dataInputStream.readUTF();
//inputstrrd = new InputStreamReader(socket.getInputStream());
String hello = "hello world";
//String inputJSON = getStringFromBuffer(new InputStreamReader(socket.getInputStream()));
//Convert
Log.e(LOG_TAG, "After inputJSON String:" + inputJSON);
/*}
catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
//LOOK HERE FIRST
//inputJSON is what is received back from the server - Take the inputJSON
//String and use regular expressions HERE to remove all the other characters in the
//string except the payload JSON.
//refreshViewModels(inputJSON);
}
@Override
public void run() {
try {
//outputstrwr.write(outputJSONserv); //UNCOMMENT IF NEED TO SEND DATA TO GET JSON BACK
inputJSON = ConvertByteArrayToString(getBytesFromInputStream(inputStr));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "IN REPEATINGTHREAD-INPUTJSON:" + inputJSON);
refreshViewModels(inputJSON);
mHandler.postDelayed(this, 3000);
}
}
public void refreshViewModels(String inputJSON) {
try {
ListView servicesListView = (ListView) this
.findViewById(R.id.profilesListView);
String[] from = new String[] { "profilePic", "neighborName",
"tagLine" };
int[] to = new int[] { R.id.avatar, R.id.username, R.id.email };
// prepare the list of all records
List<HashMap<String, Object>> fillMaps = new ArrayList<HashMap<String, Object>>();
List<Profile> profiles = new ArrayList<Profile>();
// Clear the position mapping list and reset it
this.posMap.clear();
Log.i(LOG_TAG, "NEW inputJSON: " + inputJSON);
inputJSON = getPayloadStr(inputJSON);
Log.i(LOG_TAG, "NEW inputJSON2: " + inputJSON);
JSONArray profileArray = new JSONArray(inputJSON);
for (int i=0; i<profileArray.length(); i++) {
JSONObject jsonObject = profileArray.getJSONObject(i);
Gson gson = new Gson();
Profile p = gson.fromJson(gson.toJson(jsonObject).toString(), Profile.class);
profiles.add(p);
}
int pos = 0;
// Creates the fillMaps list for the listAdapter
Log.i(LOG_TAG, "Profiles size: " + profiles.size());
//showToast("Profiles size: " + profiles.size());
for (Profile p : profiles) {
// Create mapping for list adapter
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("profilePic",
p.getAttributeValue("photo")== null? "Not Set" : p
.getAttributeValue("photo"));
map.put("neighborName",
p.getAttributeValue("Name") == null? "Not Set" : p
.getAttributeValue("Name"));
map.put("tagLine",
p.getAttributeValue("TagLine") == null? "Not Set" : p
.getAttributeValue("TagLine"));
fillMaps.add(map);
// Reset the postion mapping
this.posMap.put(pos++, p);
}
ListAdapter servicesListAdapter = new myAdapter(this, fillMaps,
R.layout.listitem, from, to);
servicesListView.setAdapter(servicesListAdapter);
} catch (Exception e) {
Log.e(LOG_TAG, "Error making list adapter: " + e.getMessage());
}
}
public String getPayloadStr(String profileString) {
Log.e("LOG_TAG", "Profile Str:"+profileString);
Pattern pattern = Pattern.compile(".*?payload\":(.*)\\}");
Log.e("LOG_TAG", "I got here 1");
Matcher matcher = pattern.matcher(profileString);
Log.e("LOG_TAG", "I got here 12");
//Matcher m = responseCodePattern.matcher(firstHeader);
matcher.matches();
matcher.groupCount();
//matcher.group(0);
Log.e("LOG_TAG", "I got here 2"+matcher.group(1));
return matcher.group(1);
}
private class myAdapter extends SimpleAdapter {
public myAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = getLayoutInflater().inflate(R.layout.listitem,
null);
}
HashMap<String, Object> data = (HashMap<String, Object>) getItem(position);
((TextView) convertView.findViewById(R.id.username))
.setText((String) data.get("neighborName"));
((TextView) convertView.findViewById(R.id.email))
.setText((String) data.get("tagLine"));
// Convert a string representing an image back to an image
String base64 = ((String)data.get("profilePic"));
byte[] picBytes = Base64.decode(base64, Base64.DEFAULT);
Bitmap bitmap = BitmapFactory.decodeByteArray(picBytes, 0, picBytes.length);
//THE IF AND THE ELSE NEED TO BE SWITCHED
if (bitmap==null){
((ImageView) convertView.findViewById(R.id.avatar)).setImageResource(R.drawable.btn_whooznear);
}else{
((ImageView) convertView.findViewById(R.id.avatar)).setImageBitmap(bitmap);
}
return convertView;
}
}
public void callProfileActivity(int position)
{
// Catch the case when service info is empty
if(serviceInfoList.size()==0){
return;
}
Profile profClick = posMap.get(position);
String b64Str = profClick.getAttributeValue("photo");
Intent startViewActivity = new Intent();
startViewActivity.putExtra("TransProfile", (Profile)posMap.get(position));
startViewActivity.putExtra("PhotoBase64", b64Str);
if(serviceInfoList.size()>position){
//DO SOMETHING HERE
}else{
Log.e(LOG_TAG,"Profile doesn't exist in sevice infoList? Selecting first one");
}
startViewActivity.setClass(this, ViewProfileActivity.class);
startActivity(startViewActivity);
}
/**
* Initialize the event handlers
*/
public void initEventHandlers() {
// Service List View
ListView servicesListView = (ListView) this
.findViewById(R.id.profilesListView);
servicesListView
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View v,
int position, long id) {
Profile clickedProfile = posMap.get(position);
//showToast("Clicked Pos: " + position);
/*Intent intent = new Intent(ConnectActivity.this, ViewProfileActivity.class);
intent.putExtra("ClickProfile", posMap.get(position));*/
callProfileActivity(position);
}
});
}
/*@Override
public void onBackPressed() { // do something on back.
super.onBackPressed();
Intent myIntent = new Intent(AndroidClient.this, ProfileActivity.class);
startActivity(myIntent);
return;
}*/
}
最佳答案
你的代码相当长，所以我不能确定到底是什么问题，但这里肯定有问题:
public static byte[] getBytesFromInputStream(InputStream is)
throws IOException {
// Get the size of the file
long length = is.available();
如果您在发送 URL 请求后立即调用此函数，服务器可能没有时间发回结果，因此 is.available() 可能会返回零或另一个小于您希望可用的实际字节数。试试code like this用于读取文件。
关于java - Android - 输入流无法正常工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12135399/