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einsteinjw银虫 (小有名气)
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[求助]
帮忙翻译下英译中,急求,谢谢了,可以翻译其中一段
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Reflection enables a Java program to analyze and modify itself. In particular, a program can discover the values of field variables and change them [ Forman 2005 ], [ Sun 2002 ]. The Java reflection API includes a method that enables fields that are normally inaccessible to be accessed under reflection. The following code prints out the names and values of all fields of an object someObject of class SomeClass; When the default security manager is used, it prevents fields that are normally inaccessible from being accessed under reflection. The default security manager throws a java.security.AccessControlException in these circumstances. However, java.lang.reflect.ReflectPermission can be granted with action suppressAccessChecks to override this default behavior. For example, although an object is ordinarily prevented from accessing private members or invoking private methods of another class, the APIs belonging to the java.lang.reflect package allow an object to do so contingent upon performing the language-defined access checks. It is important to note, however, that these access checks consider only the language-level visibility of the immediate caller. Consequently, unwary programmers can create an opportunity for a privilege escalation attack by untrusted callers. |
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zcius
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【答案】应助回帖
einsteinjw(金币+20, 翻译EPI+1): 2012-02-14 12:55:49
sltmac(金币+25): 2012-02-25 09:49:41
sltmac(金币+25): 2012-02-25 09:49:41
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反思使得Java程序可以分析且修改自己。特别是,一个程序可以发现域变量的值,并修改它们[Forman 2005],[Sun 2002]。 Java反思API包括一个方法,使得通常无法访问的域在反思时可访问。下面的代码打印出 SomeClass 类的对象 someObject 各域的名称和值; 缺省的安全管理,防止一般不可访问的域在反思时可访问。此时,缺省的安全管理启动一个 java.security.AccessControlException。但是,java.lang.reflect.ReflectPermission 准许 suppressAccessChecks 覆盖该缺省行为。 例如,虽然一个对象通常不能访问另一个类的私有成员或调用另一个类的私有方法,但 java.lang.reflect 包中的API 可视语言定义的访问检查而允许这样做。然而要注意,这些访问检查只考虑了语言层次可见的直接调用者。因此,粗心的程序员会留下受不信任调用者进行特权升级攻击的机会。 |
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