Java HTTP Post sendPostRequest(String requestURL, Map params)

Description

Makes an HTTP request using POST method to the specified URL.

License

Open Source License

Parameter

Parameter	Description
requestURL	the URL of the remote server
params	A map containing POST data in form of key-value pairs

Exception

Parameter	Description
IOException	thrown if any I/O error occurred

Return

An HttpURLConnection object

Declaration

public static HttpURLConnection sendPostRequest(String requestURL, Map<String, String> params)
        throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.IOException;

import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import java.util.Iterator;

import java.util.Map;

public class Main {
    /**/*from www.j  a  v  a  2  s.  co  m*/
     * Represents an HTTP connection
     */
    private static HttpURLConnection httpConn;

    /**
     * Makes an HTTP request using POST method to the specified URL.
     *
     * @param requestURL
     *            the URL of the remote server
     * @param params
     *            A map containing POST data in form of key-value pairs
     * @return An HttpURLConnection object
     * @throws IOException
     *             thrown if any I/O error occurred
     */
    public static HttpURLConnection sendPostRequest(String requestURL, Map<String, String> params)
            throws IOException {
        URL url = new URL(requestURL);
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);

        httpConn.setDoInput(true); // true indicates the server returns response

        StringBuffer requestParams = new StringBuffer();

        if (params != null && params.size() > 0) {

            httpConn.setDoOutput(true); // true indicates POST request

            // creates the params string, encode them using URLEncoder
            Iterator<String> paramIterator = params.keySet().iterator();
            while (paramIterator.hasNext()) {
                String key = paramIterator.next();
                String value = params.get(key);
                requestParams.append(URLEncoder.encode(key, "UTF-8"));
                requestParams.append("=").append(URLEncoder.encode(value, "UTF-8"));
                requestParams.append("&");
            }

            // sends POST data
            OutputStreamWriter writer = new OutputStreamWriter(httpConn.getOutputStream());
            writer.write(requestParams.toString());
            writer.flush();
        }

        return httpConn;
    }
}

Related

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