获取java中的登录用户名

Question

如何在Java中获取用户名/登录名？

这是我试过的代码......

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<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());
}

SecurityException当我尝试运行此代码时,我得到了一个.有人可以告诉我,我是否正朝着正确的方向前进,并帮助我理解这个问题.

Answer 1

System.getProperty("user.name")

Answer 2

在Unix中:

new com.sun.security.auth.module.UnixSystem().getUsername()

在Windows中:

new com.sun.security.auth.module.NTSystem().getName()

在Solaris中:

new com.sun.security.auth.module.SolarisSystem().getUsername()

Answer 3

受@newacct的回答启发,可以在任何平台上编译的代码:

String osName = System.getProperty( "os.name" ).toLowerCase();
String className = null;
String methodName = "getUsername";

if( osName.contains( "windows" ) ){
    className = "com.sun.security.auth.module.NTSystem";
    methodName = "getName";
}
else if( osName.contains( "linux" ) ){
    className = "com.sun.security.auth.module.UnixSystem";
}
else if( osName.contains( "solaris" ) || osName.contains( "sunos" ) ){
    className = "com.sun.security.auth.module.SolarisSystem";
}

if( className != null ){
    Class<?> c = Class.forName( className );
    Method method = c.getDeclaredMethod( methodName );
    Object o = c.newInstance();
    System.out.println( method.invoke( o ) );
}

Answer 4

System.getProperty("user.name")不是一个好的安全选项,因为该环境变量可能是伪造的:C:\ set USERNAME ="Joe Doe"java ... //将为您提供System.getProperty("user.名称")你应该这样做:

com.sun.security.auth.module.NTSystem NTSystem = new com.sun.security.auth.module.NTSystem();
System.out.println(NTSystem.getName());

JDK 1.5及更高版本.

我在applet中使用它,它必须签名. 信息来源

Answer 5

使用JNA简单:

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);

https://github.com/java-native-access/jna