Java URLConnection Create createConnection(String method, String destinationUrl)

Description

create Connection

License

Open Source License

Declaration

private static HttpURLConnection createConnection(String method, String destinationUrl)

Method Source Code


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

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

import java.util.HashMap;

import java.util.Map;
import java.util.Set;

public class Main {
    public static String METHOD_POST = "POST";
    public static String METHOD_POST_MULTIDATA = "PostMultidata";
    private static Map queryStringVars;
    private static Map postVars;
    private static Map uploadFiles;
    private static String boundary = "";
    private static String outputContent = "";
    private static OutputStream output;

    private static HttpURLConnection createConnection(String method, String destinationUrl) {
        URL url = null;//from   w  w w.java 2  s  .c o m
        HttpURLConnection httpConn = null;
        int code = -1;
        try {
            try {
                String queryString = getQueryString();
                if (!queryString.equals("")) {
                    destinationUrl = destinationUrl + "?" + queryString;
                }
                url = new URL(destinationUrl);
                httpConn = (HttpURLConnection) url.openConnection();
                if (uploadFiles.size() > 0) {
                    method = METHOD_POST_MULTIDATA;
                }
                if (method.equals(METHOD_POST_MULTIDATA)) {
                    httpConn.setRequestMethod("POST");
                } else {
                    httpConn.setRequestMethod(method);
                }
                httpConn.setUseCaches(false);
                if ((uploadFiles.size() > 0) && (postVars.size() > 0)) {
                    httpConn.setDoInput(true);
                }
                httpConn.setDoOutput(true);
                httpConn.setRequestProperty("Connection", "Keep-Alive");
                // use multipart if has to upload files
                if ((method.equals(METHOD_POST_MULTIDATA)) || (method.equals(METHOD_POST))) {
                    boundary = Long.toHexString(System.currentTimeMillis());
                    httpConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
                }

                // TODO calcular
                // httpConn.addRequestProperty("Content-length",
                // contentStrPck.size() + "");
                String CHARSET = "UTF8";
                httpConn.connect();
                PrintWriter writer = null;
                output = httpConn.getOutputStream(); // exception throws here
                writer = new PrintWriter(new OutputStreamWriter(output, CHARSET), true); // true = autoFlush,  important!

                sendPostVariables(writer, CHARSET);
                uploadFiles(writer);
                InputStreamReader in = new InputStreamReader((InputStream) httpConn.getContent());
                BufferedReader buff = new BufferedReader(in);
                String line;
                String text = "";
                do {
                    line = buff.readLine();
                    text += line + "\n";
                } while (line != null);
                outputContent = text;
                return httpConn;
            } catch (IOException io) { // throw new Exception("Server not found.");
                System.err.println(
                        "usp/ime/line/ivprog/model/utils/HttpUtil.java: createConnection(String,String): IOException "
                                + io.toString());
                io.printStackTrace();
            }
        } catch (Exception e) {
            System.err.println("usp/ime/line/ivprog/model/utils/HttpUtil.java: createConnection(String,String): "
                    + e.toString());
            e.printStackTrace();
        }
        return null;
    }

    private static String getQueryString() {
        String retorno = "";
        Set keySet = queryStringVars.keySet();
        // java.util.Set extends Collection providing java.util.Iterator iterator();
        //leo for (Object objKS : keySet) { retorno += "&" + objKS + "=" + queryStringVars.get(objKS);   } // this version do not compile on Java 4
        java.util.Iterator iterator = keySet.iterator();
        while (iterator.hasNext()) {
            Object objKS = iterator.next();
            retorno += "&" + objKS + "=" + queryStringVars.get(objKS);
        }
        if (!retorno.equals("")) {
            retorno = retorno.substring(1);
        }
        return retorno;
    }

    private static void sendPostVariables(PrintWriter writer, String charset) {
        Set keySet = postVars.keySet();
        //leo for (Object objKS : keySet) // this version do not compile on Java 4
        java.util.Iterator iterator = keySet.iterator();
        while (iterator.hasNext()) {
            Object objKS = iterator.next();
            writer.println("--" + boundary);
            writer.println("Content-Disposition: form-data; name=\"" + objKS + "\"");
            writer.println("Content-Type: text/plain; charset=" + charset);
            writer.println();
            writer.println(postVars.get(objKS));
        }
    }

    private static void uploadFiles(PrintWriter writer) {
        Set keySet = uploadFiles.keySet();
        //leo for (Object objKS : keySet)
        java.util.Iterator iterator = keySet.iterator();
        while (iterator.hasNext()) {
            Object objKS = iterator.next();

            Map fileData = (HashMap) uploadFiles.get(objKS);
            writer.println("--" + boundary);
            writer.println("Content-Disposition: form-data; name=\"" + objKS + "\"; filename=\""
                    + fileData.get("filename") + "\"");
            writer.println("Content-Transfer-Encoding: binary");
            writer.println();
            InputStream input = null;
            try {
                if (fileData.get("file") instanceof File) {
                    input = new FileInputStream((File) fileData.get("file"));
                } else if (fileData.get("file") instanceof byte[]) {
                    input = new ByteArrayInputStream((byte[]) fileData.get("file"));
                }
                byte[] buffer = new byte[1024];
                for (int length = 0; (length = input.read(buffer)) > 0;) {
                    output.write(buffer, 0, length);
                }
                output.flush(); // Important! Output cannot be closed. Close of
                // writer will close output as well.
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (input != null) {
                    try {
                        input.close();
                    } catch (IOException logOrIgnore) {
                    }
                }
            }
            writer.println(); // Important! Indicates end of binary boundary.
            // End of multipart/form-data.
            writer.println("--" + boundary + "--");
        }
    }
}

Java URLConnection Create createConnection(String method, String destinationUrl)

Description

License

Declaration

Method Source Code

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