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JRTExtractor.java
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JRTExtractor.java
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// Copyright 2017 Robert Grosse
// 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.net.*;
import java.nio.file.*;
import java.util.*;
import java.util.zip.*;
public class JRTExtractor {
static public void main(String... args) throws Throwable {
FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));
try(ZipOutputStream zipStream = new ZipOutputStream(
Files.newOutputStream(Paths.get("rt.jar")))) {
Files.walk(fs.getPath("/")).forEach(p -> {
if (!Files.isRegularFile(p)) {return;}
try {
byte[] data = Files.readAllBytes(p);
List<String> list = new ArrayList<>();
p.iterator().forEachRemaining(p2 -> list.add(p2.toString()));
assert list.remove(0).equals("modules");
if (!list.get(list.size()-1).equals("module-info.class")) {
list.remove(0);
}
String outPath = String.join("/", list);
ZipEntry ze = new ZipEntry(outPath);
zipStream.putNextEntry(ze);
zipStream.write(data);
} catch (Throwable t) {throw new RuntimeException(t);}
});
}
}
}