如何找到javaw.exe的安装位置？ [英] How to find where javaw.exe is installed?
问题描述
因此，对于我正在处理的项目，我需要找出 javaw.exe 位于用户计算机上的位置。 我该怎么做？ 假设用户在Windows机器上
So, for a project I am working on, I need to find out where a javaw.exe is located on a user's machine. How do I do that? Assuming that user is on Windows machine
我使用的方法仅限于仅限英语版本的Windows。
我查找安装操作系统的位置，找到程序文件目录，找到 Java ， jdk 目录， bin ，然后 javaw.exe 。我知道这不适用于非英语版本的Windows。
The method that I used is limited to English versions of Windows only.
I looked for where the OS is installed, locate the Program Files directory, locate Java, jdk directory, bin, then javaw.exe. I know this will not work on non-English versions of Windows.
与人类语言无关的方法是什么？
What is the human-language-independent way to do this ?
推荐答案
为了完整起见，让我提一下，有些地方（在Windows PC上）要查找 javaw.exe 以防没有在路径中找到：
（Still Reimeus的建议应该是您的第一次尝试。）
For the sake of completeness, let me mention that there are some places (on a Windows PC) to look for javaw.exe in case it is not found in the path:
(Still Reimeus' suggestion should be your first attempt.)
1。 < br>
Java通常在注册表中将其位置存储在以下键下：
HKLM \Software \ JavaSoft \ Java Runtime Environement \< CurrentVersion> \ JavaHome
2.
较新版本的JRE / JDK，似乎还要在'C：\ Windows \ System32'中放置 javaw.exe 的副本，所以有人可能也想在那里检查一下（尽管有可能，如果有的话） ，它也会在路径中找到。）
2.
Newer versions of JRE/JDK, seem to also place a copy of javaw.exe in 'C:\Windows\System32', so one might want to check there too (although chances are, if it is there, it will be found in the path as well).
3。
当然有通常安装地点：
3.
Of course there are the "usual" install locations:
- 'C：\Program Files\Java \ jre * \ bin'
- 'C：\Program Files\Java\jdk * \ bin'
- 'C：\Program Files（x86）\ Java * \\ jre * \ bin '
- 'C：\Program Files（x86）\ Java \ jdk * \bin'
- 'C:\Program Files\Java\jre*\bin'
- 'C:\Program Files\Java\jdk*\bin'
- 'C:\Program Files (x86)\Java\jre*\bin'
- 'C:\Program Files (x86)\Java\jdk*\bin'
[注意，对于旧版本的Windows（XP，Vista（？）），这只会对英文版操作系统有所帮助。幸运的是，在Windows的更高版本中，程序文件将指向该目录，而不管其显示名称（这是特定于语言的）。]
[Note, that for older versions of Windows (XP, Vista(?)), this will only help on english versions of the OS. Fortunately, on later version of Windows "Program Files" will point to the directory regardless of its "display name" (which is language-specific).]
一会儿回来，我写了这段代码来检查前面提到的 javaw.exe 。也许有人发现它很有用：
A little while back, I wrote this piece of code to check for javaw.exe in the aforementioned places. Maybe someone finds it useful:
static protected String findJavaw() {
Path pathToJavaw = null;
Path temp;
/* Check in Registry: HKLM\Software\JavaSoft\Java Runtime Environement\<CurrentVersion>\JavaHome */
String keyNode = "HKLM\\Software\\JavaSoft\\Java Runtime Environment";
List<String> output = new ArrayList<>();
executeCommand(new String[] {"REG", "QUERY", "\"" + keyNode + "\"",
"/v", "CurrentVersion"},
output);
Pattern pattern = Pattern.compile("\\s*CurrentVersion\\s+\\S+\\s+(.*)$");
for (String line : output) {
Matcher matcher = pattern.matcher(line);
if (matcher.find()) {
keyNode += "\\" + matcher.group(1);
List<String> output2 = new ArrayList<>();
executeCommand(
new String[] {"REG", "QUERY", "\"" + keyNode + "\"",
"/v", "JavaHome"},
output2);
Pattern pattern2
= Pattern.compile("\\s*JavaHome\\s+\\S+\\s+(.*)$");
for (String line2 : output2) {
Matcher matcher2 = pattern2.matcher(line2);
if (matcher2.find()) {
pathToJavaw = Paths.get(matcher2.group(1), "bin",
"javaw.exe");
break;
}
}
break;
}
}
try {
if (Files.exists(pathToJavaw)) {
return pathToJavaw.toString();
}
} catch (Exception ignored) {}
/* Check in 'C:\Windows\System32' */
pathToJavaw = Paths.get("C:\\Windows\\System32\\javaw.exe");
try {
if (Files.exists(pathToJavaw)) {
return pathToJavaw.toString();
}
} catch (Exception ignored) {}
/* Check in 'C:\Program Files\Java\jre*' */
pathToJavaw = null;
temp = Paths.get("C:\\Program Files\\Java");
if (Files.exists(temp)) {
try (DirectoryStream<Path> dirStream
= Files.newDirectoryStream(temp, "jre*")) {
for (Path path : dirStream) {
temp = Paths.get(path.toString(), "bin", "javaw.exe");
if (Files.exists(temp)) {
pathToJavaw = temp;
// Don't "break", in order to find the latest JRE version
}
}
if (pathToJavaw != null) {
return pathToJavaw.toString();
}
} catch (Exception ignored) {}
}
/* Check in 'C:\Program Files (x86)\Java\jre*' */
pathToJavaw = null;
temp = Paths.get("C:\\Program Files (x86)\\Java");
if (Files.exists(temp)) {
try (DirectoryStream<Path> dirStream
= Files.newDirectoryStream(temp, "jre*")) {
for (Path path : dirStream) {
temp = Paths.get(path.toString(), "bin", "javaw.exe");
if (Files.exists(temp)) {
pathToJavaw = temp;
// Don't "break", in order to find the latest JRE version
}
}
if (pathToJavaw != null) {
return pathToJavaw.toString();
}
} catch (Exception ignored) {}
}
/* Check in 'C:\Program Files\Java\jdk*' */
pathToJavaw = null;
temp = Paths.get("C:\\Program Files\\Java");
if (Files.exists(temp)) {
try (DirectoryStream<Path> dirStream
= Files.newDirectoryStream(temp, "jdk*")) {
for (Path path : dirStream) {
temp = Paths.get(path.toString(), "jre", "bin", "javaw.exe");
if (Files.exists(temp)) {
pathToJavaw = temp;
// Don't "break", in order to find the latest JDK version
}
}
if (pathToJavaw != null) {
return pathToJavaw.toString();
}
} catch (Exception ignored) {}
}
/* Check in 'C:\Program Files (x86)\Java\jdk*' */
pathToJavaw = null;
temp = Paths.get("C:\\Program Files (x86)\\Java");
if (Files.exists(temp)) {
try (DirectoryStream<Path> dirStream
= Files.newDirectoryStream(temp, "jdk*")) {
for (Path path : dirStream) {
temp = Paths.get(path.toString(), "jre", "bin", "javaw.exe");
if (Files.exists(temp)) {
pathToJavaw = temp;
// Don't "break", in order to find the latest JDK version
}
}
if (pathToJavaw != null) {
return pathToJavaw.toString();
}
} catch (Exception ignored) {}
}
return "javaw.exe"; // Let's just hope it is in the path :)
}
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