blocks|key|1572877|text|System.getProperty("user.name");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1572878|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>System.getProperty(&quot;user.name&quot;);
</code></pre>

blocks|key|1572894|text|在Unix中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1572895|new+com.sun.security.auth.module.UnixSystem().getUsername()|code-block|syntax|javascript|1572896|在Windows中：|1572897|new+com.sun.security.auth.module.NTSystem().getName()|1572898|在Solaris中：|1572899|new+com.sun.security.auth.module.SolarisSystem().getUsername()|1572900|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

in Unix:

<pre><code>new com.sun.security.auth.module.UnixSystem().getUsername()
</code></pre>

in Windows:

<pre><code>new com.sun.security.auth.module.NTSystem().getName()
</code></pre>

in Solaris:

<pre><code>new com.sun.security.auth.module.SolarisSystem().getUsername()
</code></pre>

blocks|key|1357770|text|System.getProperty("user.name")不是一个好的安全选项，因为环境变量可能是伪造的:+C:\+set+USERNAME="Joe+Doe“java...+//将给出您应该做的System.getProperty("user.name")：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1357771|com.sun.security.auth.module.NTSystem+NTSystem+=+new+com.sun.security.auth.module.NTSystem();
System.out.println(NTSystem.getName());|code-block|syntax|javascript|1357772|JDK+1.5及更高版本。|1357773|我在applet中使用它，并且它必须经过签名。info+source|offset|length|1357774|entityMap|0|LINK|mutability|MUTABLE|url|http://www.rgagnon.com/javadetails/java-0048.html^0|0|0|0|N|B|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

System.getProperty("user.name") is not a good security option since that environment variable could be faked:
C:\ set USERNAME="Joe Doe"
java ...
// will give you System.getProperty("user.name") 
You ought to do:

<pre><code>com.sun.security.auth.module.NTSystem NTSystem = new com.sun.security.auth.module.NTSystem();
System.out.println(NTSystem.getName());
</code></pre>

JDK 1.5 and greater.

I use it within an applet, and it has to be signed.
<a href="http://www.rgagnon.com/javadetails/java-0048.html" rel="noreferrer">info source</a>

blocks|key|1357839|text|System.getenv().get("USERNAME");+-在windows上工作！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1357840|在环境属性中，您可以获得有关计算机和主机的所需信息！我再说一遍！在WINDOWS上工作！|1357841|entityMap^0|0|W|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

<code>System.getenv().get("USERNAME");</code>
 - works on windows !

In environment properties you have the information you need about computer and host! I am saying again! Works on WINDOWS !

blocks|key|1573021|text|使用JNA很简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1573022|String+username+=+Advapi32Util.getUserName();
System.out.println(username);

Advapi32Util.Account+account+=+Advapi32Util.getAccountByName(username);
System.out.println(account.accountType);
System.out.println(account.domain);
System.out.println(account.fqn);
System.out.println(account.name);
System.out.println(account.sidString);|code-block|syntax|javascript|1573023|https://github.com/java-native-access/jna|offset|length|1573024|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|15|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@$I|U|J|V|1|W]]|A|$]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|H]]]]

Using JNA its simple:

<pre><code>String username = Advapi32Util.getUserName();
System.out.println(username);

Advapi32Util.Account account = Advapi32Util.getAccountByName(username);
System.out.println(account.accountType);
System.out.println(account.domain);
System.out.println(account.fqn);
System.out.println(account.name);
System.out.println(account.sidString);
</code></pre>

<a href="https://github.com/java-native-access/jna" rel="noreferrer">https://github.com/java-native-access/jna</a>

blocks|key|1573052|text|我在linux+centos上进行了测试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1573053|Map<String,+String>+env+=+System.getenv();+++
for+(String+envName+:+env.keySet())+{+
+System.out.format("%25s=%25s%25n",+envName,+env.get(envName));+
}

System.out.println(env.get("USERNAME"));+|code-block|syntax|javascript|1573054|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|$]]

I tested in linux centos
<pre><code>Map&lt;String, String&gt; env = System.getenv(); 
for (String envName : env.keySet()) { 
 System.out.format(&quot;%s=%s%n&quot;, envName, env.get(envName)); 
}

System.out.println(env.get(&quot;USERNAME&quot;)); 
</code></pre>

How can I get the username/login name in Java?

This is the code I have tried...

<pre><code>try{
 LoginContext lc = new LoginContext(appName,new TextCallbackHandler());
 lc.login();
 Subject subject = lc.getSubject();
 Principal principals[] = (Principal[])subject.getPrincipals().toArray(new Principal[0]);

 for (int i=0; i&lt;principals.length; i++) {
 if (principals[i] instanceof NTUserPrincipal || principals[i] instanceof UnixPrincipal) {
 String loggedInUserName = principals[i].getName();
 }
 }

}
catch(SecurityException se){
 System.out.println("SecurityException: " + se.getMessage());
}
</code></pre>

I get a <code>SecurityException</code> when I try to run this code. Could someone please tell me whether I'm heading in the right direction, and help me to understand the problem.

Get login username in java

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何在Java中获取用户名/登录名？这是我尝试过的代码...try{    LoginContext lc = new LoginContext(appName,new TextCallbackHandler());    lc.login();    Subject subject = lc.getSubject()...

问获取java中的登录用户名
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