How to send PUT, DELETE HTTP request in HttpURLConnection in JAVA

问题

I have Restful WebServices, and i send POST and GET HTTP request, how to send PUT and DELTE request HTTP in httpURLConection with JAVA.

回答1:

PUT

URL url = null;
try {
   url = new URL("http://localhost:8080/putservice");
} catch (MalformedURLException exception) {
    exception.printStackTrace();
}
HttpURLConnection httpURLConnection = null;
DataOutputStream dataOutputStream = null;
try {
    httpURLConnection = (HttpURLConnection) url.openConnection();
    httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    httpURLConnection.setRequestMethod("PUT");
    httpURLConnection.setDoInput(true);
    httpURLConnection.setDoOutput(true);
    dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream());
    dataOutputStream.write("hello");
} catch (IOException exception) {
    exception.printStackTrace();
}  finally {
    if (dataOutputStream != null) {
        try {
            dataOutputStream.flush();
            dataOutputStream.close();
        } catch (IOException exception) {
            exception.printStackTrace();
        }
    }
    if (httpsURLConnection != null) {
        httpsURLConnection.disconnect();
    }
}

DELETE

URL url = null;
try {
    url = new URL("http://localhost:8080/deleteservice");
} catch (MalformedURLException exception) {
    exception.printStackTrace();
}
HttpURLConnection httpURLConnection = null;
try {
    httpURLConnection = (HttpURLConnection) url.openConnection();
    httpURLConnection.setRequestProperty("Content-Type",
                "application/x-www-form-urlencoded");
    httpURLConnection.setRequestMethod("DELETE");
    System.out.println(httpURLConnection.getResponseCode());
} catch (IOException exception) {
    exception.printStackTrace();
} finally {         
    if (httpURLConnection != null) {
        httpURLConnection.disconnect();
    }
}

回答2:

If I use the DELETE request from @BartekM, it get this exception:

 java.net.ProtocolException: DELETE does not support writing

To fix it, I just remove this instruction:

 // httpURLConnection.setDoOutput(true);

source: Sending HTTP DELETE request in Android

回答3:

you can override

protected void doPut(HttpServletRequest req,
                      HttpServletResponse resp) throws ServletException, IOException;

Performs the HTTP PUT operation; the default implementation reports an HTTP BAD_REQUEST error. The PUT operation is analogous to sending a file via FTP. Servlet writers who override this method must respect any Content-* headers sent with the request. (These headers include content-length, content-type, content-transfer-encoding, content-encoding, content-base, content-language, content-location, content-MD5, and content-range.) If the subclass cannot honor a content header, then it must issue an error response (501) and discard the request. For more information, see the HTTP 1.1 RFC.

This method does not need to be either "safe" or "idempotent". Operations requested through PUT can have side effects for which the user can be held accountable. Although not required, servlet writers who override this method may wish to save a copy of the affected URI in temporary storage.

and

 protected void doDelete(HttpServletRequest req,
                         HttpServletResponse resp) throws ServletException, IOException

Performs the HTTP DELETE operation; the default implementation reports an HTTP BAD_REQUEST error. The DELETE operation allows a client to request a URI to be removed from the server. This method does not need to be either "safe" or "idempotent". Operations requested through DELETE can have side-effects for which users may be held accountable. Although not required, servlet writers who subclass this method may wish to save a copy of the affected URI in temporary storage.

来源：https://stackoverflow.com/questions/19320555/how-to-send-put-delete-http-request-in-httpurlconnection-in-java

标签

java

http

rest

httpurlconnection