hadoop PrintJarMainClass 源码
haddop PrintJarMainClass 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/PrintJarMainClass.java
/**
* 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 org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* A micro-application that prints the main class name out of a jar file.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class PrintJarMainClass {
/**
* @param args args.
*/
public static void main(String[] args) {
try (JarFile jar_file = new JarFile(args[0])) {
Manifest manifest = jar_file.getManifest();
if (manifest != null) {
String value = manifest.getMainAttributes().getValue("Main-Class");
if (value != null) {
System.out.println(value.replaceAll("/", "."));
return;
}
}
} catch (Throwable e) {
// ignore it
}
System.out.println("UNKNOWN");
System.exit(1);
}
}
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