我已经尝试了很多方法,使用GWT在客户端通过POST请求发送XML文件和图片的字符串,我可以成功地发送字符串,但是不知道如何使用RequestBuilder发送文件(图片),只能发送字符串。
有人知道如何使用GWT Client(RequestBuilder)发送multipart/form-data POST请求发送文件吗?
P.S.:由于我不想上传文件,所以不需要上传器或类似的东西。我正在使用Phonegap开发移动应用程序,拍照后应该将图片通过POST请求发送到服务器(第三方服务)。
提前感谢!
以下是一些代码:
public void sendPost() throws RequestException {
String boundary = createBoundary();
String xml = "<note> <to>Müller</to> <from>Jani</from> <heading>Erinnerung</heading> <body>Ich wohne in der Leipzigerstraße</body> </note>";
String requestData = getRequestData(boundary, xml);
RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, "http://localhost:8080/xxx/yyy");
builder.setHeader("Content-Type", "multipart/form-data; charset=UTF-8; boundary=" + boundary);
builder.setHeader("Content-Length", Long.toString(requestData.length()));
try {
builder.sendRequest(requestData, new RequestCallback() {
public void onResponseReceived(Request request, Response response) {
}
public void onError(Request request, Throwable exception) {
exception.printStackTrace();
}
});
} catch (RequestException e) {
e.printStackTrace();
}
}
private String getRequestData(String boundary, String xml) {
String s = "";
s += "--" + boundary + "\r\n";
s += getRequestParameter("xml", xml + "");
s += "--" + boundary + "--\r\n"; // end
return s;
}
private String getRequestParameter(String key, String value) {
return "Content-Disposition: form-data; name=\"" + key + "\"\r\n\r\n"
+ value + "\r\n";
}
private String createBoundary() {
return "----GoneVerticalBoundary" + getRandomStr() + getRandomStr();
}
private String getRandomStr() {
return Long.toString(random.nextLong(), 36); //random -> DEFINED IN THE CLASS BODY
}