How to build a http post request with the correct entity with Java and not using any library?

Question

How should I build the entity to achieve this post request?

POST https://picasaweb.google.com/data/feed/api/user/userID/albumid/albumID/photoid/photoID

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Answer 1

You can use HttpClient from apache httpcomponents to create http requests.

Find the tutorials here.

Answer 2

You can use "GDataAPI" and "Guava-libraries".

PicasawebService myService
    = new PicasawebService("exampleCo-exampleApp-1"); // just id
myService.setUserCredentials(
    "liz@gmail.com", "mypassword"); // your mailaddress, password

// change "username", "albumid" and "photoid"
URL feedUrl = new URL(
    "https://picasaweb.google.com/data/feed/api/"
    + "user/username/albumid/albumid/photoid/photoid"); 

CommentEntry myComment = new CommentEntry(); 
myComment.setContent(
    new PlainTextConstruct("great photo!")); // there is comment
myService.insert(feedUrl, myComment);

Refere to following URL.

1. http://code.google.com/intl/ja/apis/picasaweb/docs/2.0/developers_guide_java.html
2. http://code.google.com/p/gdata-java-client/downloads (GDataAPI Download)
3. http://code.google.com/p/guava-libraries/ (Guava-libraries)

Answer 3

It is a sample code using HttpClient.

I hope this piece of information will be of help to you.

// yourID
String userID = "";
String albumID = "";
String photoID = "";

HttpPost postRequest = new HttpPost(
    "https://picasaweb.google.com/data/feed/api/user/" + userID
    + "/albumid/" + albumID + "/photoid/" + photoID);

postRequest.addHeader(new BasicHeader("GData-Version", "2.0"));
postRequest.addHeader(new BasicHeader("Authorization",
    "GoogleLogin auth=" + mAuthToken));

String content = 
    "<entry xmlns='http://www.w3.org/2005/Atom'>"
    + "<content>" + comment + "</content>"
    + "<category scheme='http://schemas.google.com/g/2005#kind'"
    + " term='http://schemas.google.com/photos/2007#comment'/>"
    + "</entry>";

try {
    StringEntity entity = new StringEntity(content);
    entity.setContentType(new BasicHeader("Content-Type",
        "application/atom+xml"));
    postRequest.setEntity(entity);

    HttpClient httpclient = new DefaultHttpClient();
    HttpResponse response = httpclient.execute(postRequest);

} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
} catch (ClientProtocolException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}