Java HTTP Post httpPost(final String httpurl, final String data, final Map... requestProperties)

Description

Simple http post implementation.

License

Apache License

Parameter

Parameter	Description
httpurl	target url
data	String with content to post
requestProperties	optional http header fields (key->value)

Exception

Parameter	Description
IOException	an exception

Return

input stream of response

Declaration

@SuppressWarnings("resource")
public static InputStream httpPost(final String httpurl, final String data,
        final Map<String, String>... requestProperties) throws IOException 

Method Source Code

//package com.java2s;
/**// w  w w .j  a  va  2s .co m
 *  Copyright 2013 Sven Ewald
 *
 *  Licensed 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.OutputStream;

import java.net.HttpURLConnection;

import java.util.Map;
import java.util.Map.Entry;

public class Main {
    /**
     * Simple http post implementation. Supports HTTP Basic authentication via request properties.
     * You may want to use {@link #createBasicAuthenticationProperty} to add authentication.
     *
     * @param httpurl
     *            target url
     * @param data
     *            String with content to post
     * @param requestProperties
     *            optional http header fields (key->value)
     * @return input stream of response
     * @throws IOException
     */
    @SuppressWarnings("resource")
    public static InputStream httpPost(final String httpurl, final String data,
            final Map<String, String>... requestProperties) throws IOException {
        byte[] bytes = data.getBytes("utf-8");
        java.net.URL url = new java.net.URL(httpurl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("charset", "utf-8");
        connection.setRequestProperty("Content-Length", Integer.toString(bytes.length));
        for (Map<String, String> props : requestProperties) {
            addRequestProperties(props, connection);
        }
        OutputStream outputStream = connection.getOutputStream();
        outputStream.write(bytes);
        outputStream.flush();
        return connection.getInputStream();
    }

    /**
     * Copies request properties to a connection.
     *
     * @param requestProperties
     *            (if null, connection will not be changed)
     * @param connection
     */
    private static void addRequestProperties(final Map<String, String> requestProperties,
            final HttpURLConnection connection) {
        if (requestProperties != null) {
            for (Entry<String, String> entry : requestProperties.entrySet()) {
                connection.addRequestProperty(entry.getKey(), entry.getValue());
            }
        }
    }
}

Related

1. doPost(URL url, String body, String... args)
2. executePost(String url, JSONObject data)
3. executePostWithCredentials(String targetURL, String urlParameters, String userName, String password)
4. getHttpPOSTConnection(String urlStr, String charSet, Map props, Map params)
5. httpGet(final String httpurl, final Map... requestProperties)
6. httpPost(String httpUrl)
7. httpPost(String url, StringBuffer data)
8. httpPost(String urlToRead, String post)
9. httpPostText(String urlStr, String textString)