Java Apache Commons WordUtils.wrap() 在运行时抛出 SecurityException

Question

好吧，所以在实现org.apache.commons.lang3.text.WordUtils 类之后，我希望能够使用WordUtils.wrap(String str, int width) 函数。但我遇到了减速带。

我能够毫无问题地编译这个程序（我应该提到的是一个小程序）。我只需要设置一个 CLASSPATH 环境变量来引用 apache jar 文件，然后通过 appletviewer 让程序运行。但是，当我到达使用 WordUtils.wrap() 函数的代码部分时，一切都变糟了，我在命令提示符下收到大约 20 行运行时错误。

错误：

Caught a SecurityException reading the system property 'awt.toolkit'; the System
Utils property value will default to null.
Caught a SecurityException reading the system property 'file.encoding'; the Syst
emUtils property value will default to null.
Caught a SecurityException reading the system property 'java.awt.fonts'; the Sys
temUtils property value will default to null.
Caught a SecurityException reading the system property 'java.awt.graphicsenv'; t
he SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.awt.headless'; the
SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.awt.printerjob'; th
e SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.class.path'; the Sy
stemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.compiler'; the Syst
emUtils property value will default to null.
Caught a SecurityException reading the system property 'java.endorsed.dirs'; the
 SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.ext.dirs'; the Syst
emUtils property value will default to null.
Caught a SecurityException reading the system property 'java.home'; the SystemUt
ils property value will default to null.
Caught a SecurityException reading the system property 'java.io.tmpdir'; the Sys
temUtils property value will default to null.
Caught a SecurityException reading the system property 'java.library.path'; the
SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.runtime.name'; the
SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.runtime.version'; t
he SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.util.prefs.Preferen
cesFactory'; the SystemUtils property value will default to null.
Caught a SecurityException reading the system property 'java.vm.info'; the Syste
mUtils property value will default to null.
Caught a SecurityException reading the system property 'user.country'; the Syste
mUtils property value will default to null.
Caught a SecurityException reading the system property 'user.region'; the System
Utils property value will default to null.
Caught a SecurityException reading the system property 'user.dir'; the SystemUti
ls property value will default to null.
Caught a SecurityException reading the system property 'user.home'; the SystemUt
ils property value will default to null.
Caught a SecurityException reading the system property 'user.language'; the Syst
emUtils property value will default to null.
Caught a SecurityException reading the system property 'user.name'; the SystemUt
ils property value will default to null.
Caught a SecurityException reading the system property 'user.timezone'; the Syst
emUtils property value will default to null.

这是导致所有这些麻烦的代码行：

String strWrap = WordUtils.wrap("A really really really really really long sentence.", 50);

这里发生了什么？

Answer 1

如何将行分隔符作为参数传递以绕过 SystemUtils 访问：

String strWrap = WordUtils.wrap("A really really really really really long sentence.", 50, "\n", false);

Answer 2

您的代码使用WordUtils 调用SystemUtils 来查找系统使用的行分隔符：

newLineStr = SystemUtils.LINE_SEPARATOR;

SystemUtils 正在尝试读取由于浏览器中的安全限制而可能不允许小程序读取的系统属性。

SystemUtils 的documentation 说：

如果由于安全限制而无法读取系统属性，则 此类中的相应字段将设置为null 和一条消息 将写入System.err