Java HTTP Post sendPostRequest(Reader data, URL endpoint, Writer output)

Description

Reads data from the data reader and posts it to a server via POST request.

License

Open Source License

Parameter

Parameter	Description
data	Data to be sent
endpoint	The endpoint to which the data has to be POSTed
output	Output

Exception

Parameter	Description
Exception	If an error occurs while POSTing

Declaration

public static void sendPostRequest(Reader data, URL endpoint, Writer output) throws Exception 

Method Source Code

//package com.java2s;
/*// w  w w.ja v a2  s  . c  o m
*  Copyright (c) 2005-2011, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. licenses this file to you under the Apache License,
*  Version 2.0 (the "License"); you may not use this file except
*  in compliance with the License.
*  You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;

public class Main {
    /**
     * Reads data from the data reader and posts it to a server via POST request.
     * data - The data you want to send
     * endpoint - The server's address
     * output - writes the server's response to output
     *
     * @param data     Data to be sent
     * @param endpoint The endpoint to which the data has to be POSTed
     * @param output   Output
     * @throws Exception If an error occurs while POSTing
     */
    public static void sendPostRequest(Reader data, URL endpoint, Writer output) throws Exception {
        HttpURLConnection urlConnection = null;
        try {
            urlConnection = (HttpURLConnection) endpoint.openConnection();
            try {
                urlConnection.setRequestMethod("POST");
            } catch (ProtocolException e) {
                throw new Exception("Shouldn't happen: HttpURLConnection doesn't support POST??", e);
            }
            urlConnection.setDoOutput(true);
            urlConnection.setDoInput(true);
            urlConnection.setUseCaches(false);
            urlConnection.setAllowUserInteraction(false);
            urlConnection.setRequestProperty("Content-type", "text/xml; charset=" + "UTF-8");
            OutputStream out = urlConnection.getOutputStream();
            try {
                Writer writer = new OutputStreamWriter(out, "UTF-8");
                pipe(data, writer);
                writer.close();
            } catch (IOException e) {
                throw new Exception("IOException while posting data: " + e.getMessage(), e);
            } finally {
                if (out != null) {
                    out.close();
                }
            }
            InputStream in = urlConnection.getInputStream();
            try {
                Reader reader = new InputStreamReader(in);
                pipe(reader, output);
                reader.close();
            } catch (IOException e) {
                throw new Exception("IOException while reading response: " + e.getMessage(), e);
            } finally {
                if (in != null) {
                    in.close();
                }
            }
        } catch (IOException e) {
            throw new Exception("Connection error (is server running at " + endpoint + " ?): " + e.getMessage(), e);
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
        }
    }

    /**
     * Pipes everything from the reader to the writer via a buffer
     *
     * @param reader Reader
     * @param writer Writer
     * @throws java.io.IOException If piping fails
     */
    private static void pipe(Reader reader, Writer writer) throws IOException {
        char[] buf = new char[1024];
        int read;
        while ((read = reader.read(buf)) >= 0) {
            writer.write(buf, 0, read);
        }
        writer.flush();
    }
}

Related

1. sendPost(String link, String urlParameters)
2. sendPost(String url, String data)
3. sendPost(String url, String urlParameters)
4. sendPost(String webURL, HashMap postOptions)
5. sendPostRequest(Reader data, URL endpoint, Writer output)
6. sendPostRequest(String requestURL, Map params)
7. URLPost(String strUrl, Map map)
8. writeBody(HttpURLConnection connection, String body)
9. writeContent(HttpURLConnection urlConn, String content)