RunJar.java
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上传日期:2018-01-08
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文件大小:5k
- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you 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.
- */
- package org.apache.hadoop.util;
- import java.util.jar.*;
- import java.lang.reflect.*;
- import java.net.URL;
- import java.net.URLClassLoader;
- import java.io.*;
- import java.util.*;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.fs.FileUtil;
- /** Run a Hadoop job jar. */
- public class RunJar {
- /** Unpack a jar file into a directory. */
- public static void unJar(File jarFile, File toDir) throws IOException {
- JarFile jar = new JarFile(jarFile);
- try {
- Enumeration entries = jar.entries();
- while (entries.hasMoreElements()) {
- JarEntry entry = (JarEntry)entries.nextElement();
- if (!entry.isDirectory()) {
- InputStream in = jar.getInputStream(entry);
- try {
- File file = new File(toDir, entry.getName());
- if (!file.getParentFile().mkdirs()) {
- if (!file.getParentFile().isDirectory()) {
- throw new IOException("Mkdirs failed to create " +
- file.getParentFile().toString());
- }
- }
- OutputStream out = new FileOutputStream(file);
- try {
- byte[] buffer = new byte[8192];
- int i;
- while ((i = in.read(buffer)) != -1) {
- out.write(buffer, 0, i);
- }
- } finally {
- out.close();
- }
- } finally {
- in.close();
- }
- }
- }
- } finally {
- jar.close();
- }
- }
- /** Run a Hadoop job jar. If the main class is not in the jar's manifest,
- * then it must be provided on the command line. */
- public static void main(String[] args) throws Throwable {
- String usage = "RunJar jarFile [mainClass] args...";
- if (args.length < 1) {
- System.err.println(usage);
- System.exit(-1);
- }
- int firstArg = 0;
- String fileName = args[firstArg++];
- File file = new File(fileName);
- String mainClassName = null;
- JarFile jarFile;
- try {
- jarFile = new JarFile(fileName);
- } catch(IOException io) {
- throw new IOException("Error opening job jar: " + fileName)
- .initCause(io);
- }
- Manifest manifest = jarFile.getManifest();
- if (manifest != null) {
- mainClassName = manifest.getMainAttributes().getValue("Main-Class");
- }
- jarFile.close();
- if (mainClassName == null) {
- if (args.length < 2) {
- System.err.println(usage);
- System.exit(-1);
- }
- mainClassName = args[firstArg++];
- }
- mainClassName = mainClassName.replaceAll("/", ".");
- File tmpDir = new File(new Configuration().get("hadoop.tmp.dir"));
- tmpDir.mkdirs();
- if (!tmpDir.isDirectory()) {
- System.err.println("Mkdirs failed to create " + tmpDir);
- System.exit(-1);
- }
- final File workDir = File.createTempFile("hadoop-unjar", "", tmpDir);
- workDir.delete();
- workDir.mkdirs();
- if (!workDir.isDirectory()) {
- System.err.println("Mkdirs failed to create " + workDir);
- System.exit(-1);
- }
- Runtime.getRuntime().addShutdownHook(new Thread() {
- public void run() {
- try {
- FileUtil.fullyDelete(workDir);
- } catch (IOException e) {
- }
- }
- });
- unJar(file, workDir);
-
- ArrayList<URL> classPath = new ArrayList<URL>();
- classPath.add(new File(workDir+"/").toURL());
- classPath.add(file.toURL());
- classPath.add(new File(workDir, "classes/").toURL());
- File[] libs = new File(workDir, "lib").listFiles();
- if (libs != null) {
- for (int i = 0; i < libs.length; i++) {
- classPath.add(libs[i].toURL());
- }
- }
-
- ClassLoader loader =
- new URLClassLoader(classPath.toArray(new URL[0]));
- Thread.currentThread().setContextClassLoader(loader);
- Class<?> mainClass = Class.forName(mainClassName, true, loader);
- Method main = mainClass.getMethod("main", new Class[] {
- Array.newInstance(String.class, 0).getClass()
- });
- String[] newArgs = Arrays.asList(args)
- .subList(firstArg, args.length).toArray(new String[0]);
- try {
- main.invoke(null, new Object[] { newArgs });
- } catch (InvocationTargetException e) {
- throw e.getTargetException();
- }
- }
-
- }