blocks|key|684889|text|您可以使用JVM参数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|684890|java+-Duser.country=ES+-Duser.language=es+-Duser.variant=Traditional_WIN|code-block|syntax|javascript|684891|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use JVM args

<pre><code>java -Duser.country=ES -Duser.language=es -Duser.variant=Traditional_WIN
</code></pre>

blocks|key|468889|text|您可以使用以下代码对JAR文件强制使用VM参数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|468890|import+java.io.File;
import+java.lang.management.ManagementFactory;
import+java.lang.management.RuntimeMXBean;
import+java.net.URISyntaxException;
import+java.util.ArrayList;
import+java.util.List;

public+class+JVMArgumentEnforcer
{
++++private+String+argument;

++++public+JVMArgumentEnforcer(String+argument)
++++{
++++++++this.argument+=+argument;
++++}

++++public+static+long+getTotalPhysicalMemory()
++++{
++++++++com.sun.management.OperatingSystemMXBean+bean+=
++++++++++++++++(com.sun.management.OperatingSystemMXBean)
++++++++++++++++++++++++java.lang.management.ManagementFactory.getOperatingSystemMXBean();
++++++++return+bean.getTotalPhysicalMemorySize();
++++}

++++public+static+boolean+isUsing64BitJavaInstallation()
++++{
++++++++String+bitVersion+=+System.getProperty("sun.arch.data.model");

++++++++return+bitVersion.equals("64");
++++}

++++private+boolean+hasTargetArgument()
++++{
++++++++RuntimeMXBean+runtimeMXBean+=+ManagementFactory.getRuntimeMXBean();
++++++++List<String>+inputArguments+=+runtimeMXBean.getInputArguments();

++++++++return+inputArguments.contains(argument);
++++}

++++public+void+forceArgument()+throws+Exception
++++{
++++++++if+(!hasTargetArgument())
++++++++{
++++++++++++//+This+won't+work+from+IDEs
++++++++++++if+(JARUtilities.isRunningFromJARFile())
++++++++++++{
++++++++++++++++//+Supply+the+desired+argument
++++++++++++++++restartApplication();
++++++++++++}+else
++++++++++++{
++++++++++++++++throw+new+IllegalStateException("Please+supply+the+VM+argument+with+your+IDE:+"+%2B+argument);
++++++++++++}
++++++++}
++++}

++++private+void+restartApplication()+throws+Exception
++++{
++++++++String+javaBinary+=+getJavaBinaryPath();
++++++++ArrayList<String>+command+=+new+ArrayList<>();
++++++++command.add(javaBinary);
++++++++command.add("-jar");
++++++++command.add(argument);
++++++++String+currentJARFilePath+=+JARUtilities.getCurrentJARFilePath();
++++++++command.add(currentJARFilePath);

++++++++ProcessBuilder+processBuilder+=+new+ProcessBuilder(command);
++++++++processBuilder.start();

++++++++//+Kill+the+current+process
++++++++System.exit(0);
++++}

++++private+String+getJavaBinaryPath()
++++{
++++++++return+System.getProperty("java.home")
++++++++++++++++%2B+File.separator+%2B+"bin"
++++++++++++++++%2B+File.separator+%2B+"java";
++++}

++++public+static+class+JARUtilities
++++{
++++++++static+boolean+isRunningFromJARFile()+throws+URISyntaxException
++++++++{
++++++++++++File+currentJarFile+=+getCurrentJARFile();

++++++++++++return+currentJarFile.getName().endsWith(".jar");
++++++++}

++++++++static+String+getCurrentJARFilePath()+throws+URISyntaxException
++++++++{
++++++++++++File+currentJarFile+=+getCurrentJARFile();

++++++++++++return+currentJarFile.getPath();
++++++++}

++++++++private+static+File+getCurrentJARFile()+throws+URISyntaxException
++++++++{
++++++++++++return+new+File(JVMArgumentEnforcer.class.getProtectionDomain().getCodeSource().getLocation().toURI());
++++++++}
++++}
}|code-block|syntax|javascript|468891|它的用法如下：|468892|JVMArgumentEnforcer+jvmArgumentEnforcer+=+new+JVMArgumentEnforcer("-Duser.language=pt-BR");+//+For+example
jvmArgumentEnforcer.forceArgument();|468893|entityMap^0|A|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You can enforce VM arguments for a <code>JAR</code> file with the following code:

<pre><code>import java.io.File;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

public class JVMArgumentEnforcer
{
 private String argument;

 public JVMArgumentEnforcer(String argument)
 {
 this.argument = argument;
 }

 public static long getTotalPhysicalMemory()
 {
 com.sun.management.OperatingSystemMXBean bean =
 (com.sun.management.OperatingSystemMXBean)
 java.lang.management.ManagementFactory.getOperatingSystemMXBean();
 return bean.getTotalPhysicalMemorySize();
 }

 public static boolean isUsing64BitJavaInstallation()
 {
 String bitVersion = System.getProperty("sun.arch.data.model");

 return bitVersion.equals("64");
 }

 private boolean hasTargetArgument()
 {
 RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
 List&lt;String&gt; inputArguments = runtimeMXBean.getInputArguments();

 return inputArguments.contains(argument);
 }

 public void forceArgument() throws Exception
 {
 if (!hasTargetArgument())
 {
 // This won't work from IDEs
 if (JARUtilities.isRunningFromJARFile())
 {
 // Supply the desired argument
 restartApplication();
 } else
 {
 throw new IllegalStateException("Please supply the VM argument with your IDE: " + argument);
 }
 }
 }

 private void restartApplication() throws Exception
 {
 String javaBinary = getJavaBinaryPath();
 ArrayList&lt;String&gt; command = new ArrayList&lt;&gt;();
 command.add(javaBinary);
 command.add("-jar");
 command.add(argument);
 String currentJARFilePath = JARUtilities.getCurrentJARFilePath();
 command.add(currentJARFilePath);

 ProcessBuilder processBuilder = new ProcessBuilder(command);
 processBuilder.start();

 // Kill the current process
 System.exit(0);
 }

 private String getJavaBinaryPath()
 {
 return System.getProperty("java.home")
 + File.separator + "bin"
 + File.separator + "java";
 }

 public static class JARUtilities
 {
 static boolean isRunningFromJARFile() throws URISyntaxException
 {
 File currentJarFile = getCurrentJARFile();

 return currentJarFile.getName().endsWith(".jar");
 }

 static String getCurrentJARFilePath() throws URISyntaxException
 {
 File currentJarFile = getCurrentJARFile();

 return currentJarFile.getPath();
 }

 private static File getCurrentJARFile() throws URISyntaxException
 {
 return new File(JVMArgumentEnforcer.class.getProtectionDomain().getCodeSource().getLocation().toURI());
 }
 }
}
</code></pre>

It is used as follows:

<pre><code>JVMArgumentEnforcer jvmArgumentEnforcer = new JVMArgumentEnforcer("-Duser.language=pt-BR"); // For example
jvmArgumentEnforcer.forceArgument();
</code></pre>

blocks|key|685016|text|您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|685017|​|685018|📷|atomic|offset|length|685019|685020|685021|685022|685023|并捕获区域设置。您可以这样做：|685024|private+static+final+String+LOCALE+=+LocaleContextHolder.getLocale().getLanguage()
++++++++++++%2B+"-"+%2B+LocaleContextHolder.getLocale().getCountry();|code-block|syntax|javascript|685025|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/047e1b9569cd0713dc4e52c6647b1a7d.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/e2b5577316490f47e306179d8b5eda2d.png^0|0|0|0|1|0|0|0|0|0|1|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|I|3|C|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|E|5|F|7|1C|8|@]|9|@$G|1D|H|1E|1|1F]]|A|$]]|$1|L|3|C|5|6|7|1G|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1H|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1I|8|@]|9|@]|A|$R|S]]|$1|T|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10|11|-4]]|12|$5|W|X|Y|A|$Z|13|11|-4]]]]

You can do this:

<a href="https://i.stack.imgur.com/Jky06.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jky06.png" alt="enter image description here"></a>

<a href="https://i.stack.imgur.com/lwGdz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lwGdz.png" alt="enter image description here"></a>

And to capture locale. You can do this:

<pre><code>private static final String LOCALE = LocaleContextHolder.getLocale().getLanguage()
 + "-" + LocaleContextHolder.getLocale().getCountry();
</code></pre>

blocks|key|469070|text|如果您不喜欢更改系统区域设置，除了JVM之外，还有另一种方法。您可以设置系统(或用户)环境变量JAVA_TOOL_OPTIONS，并将其值设置为-Duser.language=en-US或所需的任何其他语言区域。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|469071|entityMap^0|1B|H|20|L|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

There is another away if you don't like to change System locale but the JVM. you can setup a System (or user) Environment variable <code>JAVA_TOOL_OPTIONS</code> and set its value to <code>-Duser.language=en-US</code> or any other language-REGION you want.

I want to set the default <code>Locale</code> for my JVM to <code>fr_CA</code>. What are the possible options to do this?

I know of only one option <code>Locale.setDefault()</code>

How do I set the default locale in the JVM?

我想将我的JVM的默认Locale设置为fr_CA。要做到这一点，可能的选择是什么？我只知道一个选择Locale.setDefault()

问如何在JVM中设置默认区域设置？
EN

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