Java example source code file (MailToURLConnection.java)

This example Java source code file (MailToURLConnection.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

cannot, illegalargumentexception, inputstream, ioexception, mailtourlconnection, messageheader, net, network, outputstream, override, permission, security, smtp, smtpclient, socketpermission, string, www

The MailToURLConnection.java Java example source code

/*
 * Copyright (c) 1996, 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.net.www.protocol.mailto;

import java.net.URL;
import java.net.InetAddress;
import java.net.SocketPermission;
import java.io.*;
import java.security.Permission;
import sun.net.www.*;
import sun.net.smtp.SmtpClient;
import sun.net.www.ParseUtil;


/**
 * Handle mailto URLs. To send mail using a mailto URLConnection,
 * call <code>getOutputStream, write the message to the output
 * stream, and close it.
 *
 */
public class MailToURLConnection extends URLConnection {
    InputStream is = null;
    OutputStream os = null;

    SmtpClient client;
    Permission permission;
    private int connectTimeout = -1;
    private int readTimeout = -1;

    MailToURLConnection(URL u) {
        super(u);

        MessageHeader props = new MessageHeader();
        props.add("content-type", "text/html");
        setProperties(props);
    }

    /**
     * Get the user's full email address - stolen from
     * HotJavaApplet.getMailAddress().
     */
    String getFromAddress() {
        String str = System.getProperty("user.fromaddr");
        if (str == null) {
            str = System.getProperty("user.name");
            if (str != null) {
                String host = System.getProperty("mail.host");
                if (host == null) {
                    try {
                        host = InetAddress.getLocalHost().getHostName();
                    } catch (java.net.UnknownHostException e) {
                    }
                }
                str += "@" + host;
            } else {
                str = "";
            }
        }
        return str;
    }

    public void connect() throws IOException {
        client = new SmtpClient(connectTimeout);
        client.setReadTimeout(readTimeout);
    }

    @Override
    public synchronized OutputStream getOutputStream() throws IOException {
        if (os != null) {
            return os;
        } else if (is != null) {
            throw new IOException("Cannot write output after reading input.");
        }
        connect();

        String to = ParseUtil.decode(url.getPath());
        client.from(getFromAddress());
        client.to(to);

        os = client.startMessage();
        return os;
    }

    @Override
    public Permission getPermission() throws IOException {
        if (permission == null) {
            connect();
            String host = client.getMailHost() + ":" + 25;
            permission = new SocketPermission(host, "connect");
        }
        return permission;
    }

    @Override
    public void setConnectTimeout(int timeout) {
        if (timeout < 0)
            throw new IllegalArgumentException("timeouts can't be negative");
        connectTimeout = timeout;
    }

    @Override
    public int getConnectTimeout() {
        return (connectTimeout < 0 ? 0 : connectTimeout);
    }

    @Override
    public void setReadTimeout(int timeout) {
        if (timeout < 0)
            throw new IllegalArgumentException("timeouts can't be negative");
        readTimeout = timeout;
    }

    @Override
    public int getReadTimeout() {
        return readTimeout < 0 ? 0 : readTimeout;
    }
}