Quelle DeleteTempJar.java Sprache: JAVA

/*
* Copyright (c) 1999, 2022, 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.
*
* 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.
*/

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.JarURLConnection;
import java.net.URL;

import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;

import com.sun.net.httpserver.*;

public class DeleteTempJar
{
    public static void realMain(String args[]) throws Exception
    {
        final File zf = File.createTempFile("deletetemp", ".jar");
        zf.deleteOnExit();
        try (FileOutputStream fos = new FileOutputStream(zf);
             JarOutputStream jos = new JarOutputStream(fos))
        {
            JarEntry je = new JarEntry("entry");
            jos.putNextEntry(je);
            jos.write("hello, world".getBytes("ASCII"));
        }

        HttpServer server = HttpServer.create(
                new InetSocketAddress((InetAddress) null, 0), 0);
        HttpContext context = server.createContext("/",
            new HttpHandler() {
                public void handle(HttpExchange e) {
                    try (FileInputStream fis = new FileInputStream(zf)) {
                        e.sendResponseHeaders(200, zf.length());
                        OutputStream os = e.getResponseBody();
                        byte[] buf = new byte[1024];
                        int count = 0;
                        while ((count = fis.read(buf)) != -1) {
                            os.write(buf, 0, count);
                        }
                    } catch (Exception ex) {
                        unexpected(ex);
                    } finally {
                        e.close();
                    }
                }
            });

        server.start();
        try {
            URL url = new URL("jar:http://localhost:"
                          + new Integer(server.getAddress().getPort()).toString()
                          + "/deletetemp.jar!/");
            JarURLConnection c = (JarURLConnection)url.openConnection();
            JarFile f = c.getJarFile();
            check(f.getEntry("entry") != null);
            System.out.println(f.getName());
        } finally {
            server.stop(0);
        }
    }

    //--------------------- Infrastructure ---------------------------
    static volatile int passed = 0, failed = 0;
    static boolean pass() {passed++; return true;}
    static boolean fail() {failed++; Thread.dumpStack(); return false;}
    static boolean fail(String msg) {System.out.println(msg); return fail();}
    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
    static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;}
    static boolean equal(Object x, Object y) {
        if (x == null ? y == null : x.equals(y)) return pass();
        else return fail(x + " not equal to " + y);}
    public static void main(String[] args) throws Throwable {
        try {realMain(args);} catch (Throwable t) {unexpected(t);}
        if (failed > 0) throw new AssertionError("Some tests failed");}
}

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