How do I parse JSON from a Java HTTPResponse

Question

I have an HttpResponse object for a web request I just made  The response is in the JSON format  so I need to parse it   I can do it in an absurdly complex way  but it seems like there must be a better way   Is this really the best I can do       HttpResponse response     some response object     Reader in   new BufferedReader          new InputStreamReader response getEntity   getContent     UTF-8         StringBuilder builder  new StringBuilder        char   buf   new char 1000       int l   0      while  l  gt   0            builder append buf  0  l           l   in read buf             JSONTokener tokener   new JSONTokener  builder toString          JSONArray finalResult   new JSONArray  tokener      I m on Android if that makes any difference

User · Answer

Jackson appears to support some amount of JSON parsing straight from an InputStream  My understanding is that it runs on Android and is fairly quick  On the other hand  it is an extra JAR to include with your app  increasing download and on-flash size

User · Answer

You can use the Gson library for parsing  void getJson   throws IOException       HttpClient  httpClient   new DefaultHttpClient        HttpGet httpGet   new HttpGet  some url of json        HttpResponse httpResponse   httpClient execute httpGet       String response   EntityUtils toString httpResponse getEntity          Gson gson   new Gson        MyClass myClassObj   gson fromJson response  MyClass class        here is sample json file which is fetchd from server     id  5   name   kitkat    version   4 4      here is my class  class MyClass  int id  String name  String version      refer this

User · Answer

There is no need to do the reader loop yourself  The JsonTokener has this built in  E g   ttpResponse response     some response object BufferedReader reader   new BufferedReader new     JSONTokener tokener   new JSONTokener reader   JSONArray finalResult   new JSONArray tokener

User · Answer

For Android  and using Apache s Commons IO Library for IOUtils      connection is a HttpURLConnection InputStream inputStream   connection getInputStream   ByteArrayOutputStream baos   new ByteArrayOutputStream    IOUtils copy inputStream  baos   JSONObject jsonObject   new JSONObject baos toString        JSONObject is part of Android library

User · Answer

Two things which can be done more efficiently     Use StringBuilder instead of StringBuffer since it s the faster and younger brother  Use BufferedReader readLine   to read it line by line instead of reading it char by char      HttpResponse response     some response object BufferedReader reader   new BufferedReader new InputStreamReader response getEntity   getContent     UTF-8     StringBuilder builder   new StringBuilder    for  String line   null   line   reader readLine       null         builder append line  append   n      JSONTokener tokener   new JSONTokener builder toString     JSONArray finalResult   new JSONArray tokener     If the JSON is actually a single line  then you can also remove the loop and builder   HttpResponse response     some response object BufferedReader reader   new BufferedReader new InputStreamReader response getEntity   getContent     UTF-8     String json   reader readLine    JSONTokener tokener   new JSONTokener json   JSONArray finalResult   new JSONArray tokener

User · Answer

Instead of doing  Reader in   new BufferedReader      new InputStreamReader response getEntity   getContent     UTF-8     StringBuilder builder  new StringBuilder    char   buf   new char 1000   int l   0  while  l  gt   0        builder append buf  0  l       l   in read buf     JSONTokener tokener   new JSONTokener  builder toString        You can do   JSONTokener tokener   new JSONTokener                             IOUtils toString response getEntity   getContent         where IOUtils is from the commons IO library

User · Answer

Use JSON Simple   http   code google com p json-simple   Which has a small foot-print  no dependencies so it s perfect for Android   You can do something like this   Object obj JSONValue parse buffer tString     JSONArray finalResult  JSONArray obj

[java] How do I parse JSON from a Java HTTPResponse?

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