How to send post request with x-www-form-urlencoded body

Question

How in java  can I send a request with x-www-form-urlencoded header  I don t understand how to send a body with a key-value  like in the above screenshot   I have tried this code   String urlParameters     cafedra name  data to send  URL url      HttpURLConnection connection   null        try           Create connection       url   new URL targetURL         connection    HttpURLConnection url openConnection          connection setRequestMethod  POST          connection setRequestProperty  Content-Type                application x-www-form-urlencoded           connection setRequestProperty  Content-Length                        Integer toString urlParameters getBytes   length          connection setRequestProperty  Content-Language    en-US             connection setUseCaches  false         connection setDoInput true         connection setDoOutput true            Send request       DataOutputStream wr   new DataOutputStream                     connection getOutputStream            wr writeBytes  urlParameters         wr flush           wr close       But in the response  I don t receive the correct data

User · Answer

For HttpEntity  the below answer works  HttpHeaders headers   new HttpHeaders    headers setContentType MediaType APPLICATION FORM URLENCODED    MultiValueMap lt String  String gt  map  new LinkedMultiValueMap lt String  String gt     map add  email    first last example com     HttpEntity lt MultiValueMap lt String  String gt  gt  request   new HttpEntity lt MultiValueMap lt String  String gt  gt  map  headers    ResponseEntity lt String gt  response   restTemplate postForEntity  url  request   String class      For reference  How to POST form data with Spring RestTemplate

User · Answer

As you set application x-www-form-urlencoded as content type so data sent must be like this format   String urlParameters     param1 data1 amp param2 data2 amp param3 data3     Sending part now is quite straightforward   byte   postData   urlParameters getBytes  StandardCharsets UTF 8    int postDataLength   postData length  String request     lt Url here gt    URL url   new URL  request    HttpURLConnection conn   HttpURLConnection  url openConnection               conn setDoOutput true   conn setInstanceFollowRedirects false   conn setRequestMethod  POST    conn setRequestProperty  Content-Type    application x-www-form-urlencoded     conn setRequestProperty  charset    utf-8    conn setRequestProperty  Content-Length   Integer toString postDataLength     conn setUseCaches false   try DataOutputStream wr   new DataOutputStream conn getOutputStream          wr write  postData        Or you can create a generic method to build key value pattern which is required for application x-www-form-urlencoded   private String getDataString HashMap lt String  String gt  params  throws UnsupportedEncodingException      StringBuilder result   new StringBuilder        boolean first   true      for Map Entry lt String  String gt  entry   params entrySet             if  first              first   false          else             result append   amp                 result append URLEncoder encode entry getKey     UTF-8             result append               result append URLEncoder encode entry getValue     UTF-8                   return result toString

User · Answer

string urlParameters    quot param1 value1 amp param2 value2 quot   string  endPointName    quot your url post api quot    var httpWebRequest    HttpWebRequest WebRequest Create  endPointName    httpWebRequest ContentType    quot application x-www-form-urlencoded quot   httpWebRequest Method    quot POST quot   httpWebRequest Headers  quot ContentType quot      quot application x-www-form-urlencoded quot    System Net ServicePointManager ServerCertificateValidationCallback                                                       se  cert  chain  sslerror    gt                                                                                                            return true                                                         using  var streamWriter   new StreamWriter httpWebRequest GetRequestStream                                           streamWriter Write urlParameters                       streamWriter Flush                        streamWriter Close                      var httpResponse    HttpWebResponse httpWebRequest GetResponse     using  var streamReader   new StreamReader httpResponse GetResponseStream                                           var result   streamReader ReadToEnd

[java] How to send post request with x-www-form-urlencoded body

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