Java URL Read retrieveResponseMessage(HttpURLConnection connection)

Description

Reads a response from the HttpURLConnection instance

License

Apache License

Parameter

Parameter	Description
connection	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static final String retrieveResponseMessage(HttpURLConnection connection) 

Method Source Code

//package com.java2s;
/*//from w  ww  . java 2  s.  co  m
 * Copyright 2004,2005 The Apache Software Foundation.
 *
 * 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.net.HttpURLConnection;

public class Main {
    /**
     * Reads a response from the HttpURLConnection instance
     * @param connection
     * @return
     * @throws IOException 
     */
    public static final String retrieveResponseMessage(HttpURLConnection connection) {
        InputStream tmpIn2 = null;
        try {
            tmpIn2 = connection.getInputStream();
        } catch (IOException e) {
            tmpIn2 = connection.getErrorStream();
        }

        // Read the sync response
        boolean done = false;

        byte[] buffer = new byte[4096];
        String message = null;
        int saved = 0;
        int len;

        a: for (;;) {
            if (done) {
                break;
            }

            len = buffer.length;
            // Used to be 1, but if we block it doesn't matter
            // however 1 will break with some servers, including apache
            if (len == 0) {
                len = buffer.length;
            }
            if (saved + len > buffer.length) {
                len = buffer.length - saved;
            }
            int len1 = 0;

            while (len1 == 0) {
                try {
                    len1 = tmpIn2.read(buffer, saved, len);
                } catch (Exception ex) {
                    ex.printStackTrace();
                    if (done && saved == 0) {
                        break a;
                    }
                    len1 = -1;
                    break;
                }
            }
            len = len1;

            if (len == -1 && saved == 0) {
                break;
            }
            if (len == -1) {
                done = true;
            }

            // No matter how we may (or may not) format it, send it
            // on unformatted - we don't want to mess with how its
            // sent to the other side, just how its displayed

            message = new String(buffer, 0, len);

            System.out.println(message);
        }

        return message;
    }
}

Related

1. readUrlContent(URLConnection connection)
2. readURLToString(String url)
3. readUrlToString(String urlString)
4. readVersion(URLConnection connection)
5. retrieve(URL url)