Hi guys,
I am new in this field and this is a problem when I want to construct
a http request and send it.
Learn form GWT that I can send a request as follows:
1. String url =....
2. RequestBuilder builder = new RequestBuilder
(RequestBuilder.POST,URL.encode(url));
3. builder.setHeader("Content-Type", "application/x-www-form-
urlencoded");
4. String form = "name=aaa&age=13";
5. builder.sendRequest(form,newRequestCallback() {
6. .....
7. });
So,what if there is a file input field and the contetn type is
multipart/form-data ? so according to the standard HTTP header format
when sending this kind of form,my solution is as follows :
public void onModuleLoad() {
final TextBox text = new TextBox();
final Button btn = new Button("Http Request Test");
final Label lbl = new Label("");
RootPanel.get().add(text);
RootPanel.get().add(btn);
RootPanel.get().add(lbl);
btn.addClickHandler(new ClickHandler()
{
public void onClick(ClickEvent event) {
btn.setEnabled(false);
String url =
"http://export.writer.zoho.com/remotedoc.im?
apikey=e13ac14e4b7bd43f8bae584105d39318&output=editor";
String BOUNDARY =
"---------------------------7d4a6d158c9";
url = URL.encode(url);
RequestBuilder builder = new
RequestBuilder(RequestBuilder.POST,
url);
StringBuffer sb = new StringBuffer();
sb = sb.append("--");
sb = sb.append(BOUNDARY);
sb = sb.append("\r\n");
sb = sb.append("Content-Disposition: form-data;
name=\"Edit\"\r\n\r
\n");
sb = sb.append(URL.encode("divbutton"));
sb = sb.append("\r\n");
sb = sb.append("--");
sb = sb.append(BOUNDARY);
sb = sb.append("\r\n");
sb = sb.append("Content-Disposition: form-data;
name=\"content\";
filename=\"1.txt\"\r\n");
sb = sb.append("Content-Type:
application/octet-stream\r\n\r\n");
byte[] data = sb.toString().getBytes();
byte[] end_data = ("\r\n--" + BOUNDARY +
"--\r\n").getBytes();
byte[] fileContent=....; // the file content
/*
//Logic to write the data to http header,it may
like this but not
support by request builder:
output = builder.openOutputStream();
output.write(data);
output.write(fileContent);
output.write(end_data);
*/
builder.setHeader("Content-Type",
"multipart/form-data;
charset=utf-8;boundary="+BOUNDARY);
builder.setHeader("Content-Length",
String.valueOf(data.length +
fileContent.length + end_data.length));
try {
builder.send();
} catch (RequestException e) {
e.printStackTrace();
}
}
}
);
}
1. The code will fail in compilation ,ERROR:The method getBytes() is
undefined for the type String ? Why does this error happen?
2.How can I add the byte[] to the related field in the http header?
Thanks very much !!!
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