JxBrowser

To load web page by its URL and send some POST data, use the Browser.loadURL(LoadURLParams params) method. The following code demonstrates how to load URL and send POST data in different formats using extra headers:

application/x-www-form-urlencoded 

browser.loadURL(new LoadURLParams("http://www.google.com", "myKey=myValue&myKey2=myValue2"));

text/plain 

browser.loadURL(new LoadURLParams("http://www.google.com", "Some Text...", "Content-Type: text/plain\n"));

application/json 

browser.loadURL(new LoadURLParams("http://www.google.com", "{\"title\":\"Hello\"}", "Content-Type: application/json\n"));