Java URL Connection httpPost(String urlString, String postPath, Map keyValuePairs)

Description

http Post

License

Open Source License

Declaration

public static List<String> httpPost(String urlString, String postPath, Map<String, String> keyValuePairs) 

Method Source Code

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

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;

import java.util.List;
import java.util.Map;

import java.util.Map.Entry;

public class Main {
    public static List<String> httpPost(String urlString, String postPath, Map<String, String> keyValuePairs) {
        List<String> ret = new ArrayList<String>();
        try {//from  ww  w  .j a v  a 2 s  .c  om
            // first strip away any ending "/" character from urlString
            //   and any beginning "/" from postPath
            String firstPart;
            if (urlString.substring(urlString.length() - 1).compareTo("/") == 0) {
                firstPart = urlString.substring(0, urlString.length() - 1);
            } else {
                firstPart = urlString;
            }
            String secondPart;
            if (postPath.substring(0).compareTo("/") == 0) {
                secondPart = postPath.substring(1, postPath.length() - 1);
            } else {
                secondPart = postPath.substring(0, postPath.length() - 1);
            }
            String completePath = firstPart + "/" + secondPart;
            URL url = new URL(completePath);
            // Construct data
            String data = null;
            for (Entry<String, String> entry : keyValuePairs.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue();
                if (data == null) {
                    data = URLEncoder.encode(key, "UTF-8") + "=" + URLEncoder.encode(value, "UTF-8");
                } else {
                    data += "&" + URLEncoder.encode(key, "UTF-8") + "=" + URLEncoder.encode(value, "UTF-8");
                }
            }

            // Send data
            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(data);
            wr.flush();

            // Get the response
            BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = rd.readLine()) != null) {
                ret.add(line);
            }
            wr.close();
            rd.close();
        } catch (Exception e) {
            return null;
        }
        return ret;
    }
}

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