POST request send json data java HttpUrlConnection

Question

I have developed a java code that convert the following cURL to java code using URL and HttpUrlConnection  the curl is     curl -i  http   url com  -X POST -H  Content-Type  application json  -H  Accept  application json  -d    auth      passwordCredentials     username    adm    password    pwd    tenantName   adm       I have written this code but it always gives HTTP code 400 bad request  I couldn t find what is missing   String url  http   url com   URL object new URL url    HttpURLConnection con    HttpURLConnection  object openConnection    con setDoOutput true   con setDoInput true   con setRequestProperty  Content-Type    application json    con setRequestProperty  Accept    application json    con setRequestMethod  POST     JSONObject cred     new JSONObject    JSONObject auth     new JSONObject    JSONObject parent   new JSONObject     cred put  username   adm    cred put  password    pwd     auth put  tenantName    adm    auth put  passwordCredentials   cred toString      parent put  auth   auth toString      OutputStreamWriter wr   new OutputStreamWriter con getOutputStream     wr write parent toString     wr flush       display what returns the POST request  StringBuilder sb   new StringBuilder      int HttpResult   con getResponseCode     if  HttpResult    HttpURLConnection HTTP OK        BufferedReader br   new BufferedReader              new InputStreamReader con getInputStream     utf-8         String line   null        while   line   br readLine       null              sb append line     n                br close        System out println      sb toString         else       System out println con getResponseMessage

User · Answer

Your JSON is not correct  Instead of  JSONObject cred   new JSONObject    JSONObject auth new JSONObject    JSONObject parent new JSONObject    cred put  username   adm    cred put  password    pwd    auth put  tenantName    adm    auth put  passwordCredentials   cred toString         lt -- toString   parent put  auth   auth toString                      lt -- toString    OutputStreamWriter wr  new OutputStreamWriter con getOutputStream     wr write parent toString       write  JSONObject cred   new JSONObject    JSONObject auth new JSONObject    JSONObject parent new JSONObject    cred put  username   adm    cred put  password    pwd    auth put  tenantName    adm    auth put  passwordCredentials   cred   parent put  auth   auth    OutputStreamWriter wr  new OutputStreamWriter con getOutputStream     wr write parent toString       So  the JSONObject toString   should be called only once for the outer object   Another thing  most probably not your problem  but I d like to mention it    To be sure not to run into encoding problems  you should specify the encoding  if it is not UTF-8   con setRequestProperty  Content-Type    application json  charset UTF-8    con setRequestProperty  Accept    application json             OutputStream os   con getOutputStream    os write parent toString   getBytes  UTF-8     os close

User · Answer

private JSONObject uploadToServer   throws IOException  JSONException               String query    https   example com               String json       key   1                 URL url   new URL query               HttpURLConnection conn    HttpURLConnection  url openConnection                conn setConnectTimeout 5000               conn setRequestProperty  Content-Type    application json  charset UTF-8                conn setDoOutput true               conn setDoInput true               conn setRequestMethod  POST                 OutputStream os   conn getOutputStream                os write json getBytes  UTF-8                 os close                    read the response             InputStream in   new BufferedInputStream conn getInputStream                 String result   org apache commons io IOUtils toString in   UTF-8                JSONObject jsonObject   new JSONObject result                 in close                conn disconnect                 return jsonObject

User · Answer

You can use this code for connect and request using http and json try                     URL url   new URL  quot https   www googleapis com youtube v3 playlistItems part snippet quot                     quot  amp key  quot  key                    quot  amp access token  quot    access token           HttpURLConnection conn    HttpURLConnection  url openConnection            conn setDoOutput true           conn setRequestMethod  quot POST quot            conn setRequestProperty  quot Content-Type quot    quot application json quot              String input    quot     quot snippet  quot      quot playlistId  quot     quot WL  quot    quot resourceId  quot      quot videoId  quot     quot  quot  videoId  quot   quot    quot kind  quot     quot youtube video  quot     quot position  quot   0   quot             OutputStream os   conn getOutputStream            os write input getBytes             os flush              if  conn getResponseCode      HttpURLConnection HTTP CREATED                throw new RuntimeException  quot Failed   HTTP error code    quot                    conn getResponseCode                         BufferedReader br   new BufferedReader new InputStreamReader                   conn getInputStream                 String output          System out println  quot Output from Server       n quot            while   output   br readLine       null                System out println output                       conn disconnect              catch  MalformedURLException e              e printStackTrace              catch  IOException e              e printStackTrace

User · Answer

the correct answer is good   but   OutputStreamWriter wr  new OutputStreamWriter con getOutputStream     wr write parent toString       not work for me   instead of it   use    byte   outputBytes   rootJsonObject getBytes  UTF-8    OutputStream os   con getOutputStream    os write outputBytes

User · Answer

I had a similar issue  I was getting 400  Bad Request only with the PUT  where as POST request was perfectly fine   Below code worked fine for POST but was giving BAD Request for PUT   conn setRequestProperty  Content-Type    application json    os writeBytes json     After making below changes worked fine for both POST and PUT  conn setRequestProperty  Content-Type    application json  charset UTF-8    os write json getBytes  UTF-8

[java] POST request send json data java HttpUrlConnection

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