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自动检测Linux下的Java

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This commit is contained in:
yushijinhun 2018-06-06 23:01:27 +08:00
parent 27c4a68a13
commit afa37c0d2f
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GPG Key ID: 5BC167F73EA558E4
1 changed files with 32 additions and 1 deletions
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33
HMCLCore/src/main/java/org/jackhuang/hmcl/util/JavaVersion.java
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@ -18,10 +18,17 @@
package org.jackhuang.hmcl.util;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.concurrent.CountDownLatch;
import java.util.logging.Level;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Represents a Java installation.
@ -69,7 +76,7 @@ public final class JavaVersion implements Serializable {
return version;
}
private static final Pattern REGEX = Pattern.compile("java version \"(?<version>(.*?))\"");
private static final Pattern REGEX = Pattern.compile("version \"(?<version>(.*?))\"");
public static final int UNKNOWN = -1;
public static final int JAVA_5 = 50;
@ -175,6 +182,9 @@ public final class JavaVersion implements Serializable {
case WINDOWS:
javaVersions = queryWindows();
break;
case LINUX:
javaVersions = queryLinux();
break;
case OSX:
javaVersions = queryMacintosh();
break;
@ -188,6 +198,27 @@ public final class JavaVersion implements Serializable {
LATCH.countDown();
}
private static List<JavaVersion> queryLinux() throws IOException {
Path jvmDir = Paths.get("/usr/lib/jvm");
if (Files.isDirectory(jvmDir)) {
return Files.list(jvmDir)
.filter(dir -> Files.isDirectory(dir, LinkOption.NOFOLLOW_LINKS))
.map(dir -> dir.resolve("bin/java"))
.filter(Files::isExecutable)
.flatMap(executable -> {
try {
return Stream.of(fromExecutable(executable.toFile()));
} catch (IOException e) {
Logging.LOG.log(Level.WARNING, "Couldn't determine java " + executable, e);
return Stream.empty();
}
})
.collect(Collectors.toList());
} else {
return Collections.emptyList();
}
}
private static List<JavaVersion> queryMacintosh() throws IOException {
LinkedList<JavaVersion> res = new LinkedList<>();