System.out.println(System.getProperty("java.library.path"));

System.out.println(System.getProperty("java.library.path"));
System.loadLibrary("sms");
什么意思?System.getProperty("java.library.path")

java可以通过System.getProperty获得系统变量的值。而java.library.path只是其中的一个，表示系统搜索库文件的路径。

例如这个值可以能是 c;\windows;d:\test;e:\mytest

那当你在程序中装载一个dll库时，系统就是去当前目录和这几个目录找看看有没有这个文件。

这个类作用是很大的，我们可以获取很多信息。

System.getProperty()参数大全

java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
java.vm.specification.version Java Virtual Machine specification version
java.vm.specification.vendor Java Virtual Machine specification vendor
java.vm.specification.name Java Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor
java.vm.name Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.library.path List of paths to search when loading libraries
java.io.tmpdir Default temp file path
java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories
os.name Operating system name
os.arch Operating system architecture
os.version Operating system version
file.separator File separator ("/" on UNIX)
path.separator Path separator (":" on UNIX)
line.separator Line separator ("\n" on UNIX)
user.name User's account name
user.home User's home directory
user.dir User's current working directory

工程 右键properties(属性) >>resource 中 text file encoding other:选择编码 输出就是选择的..