java如何调用系统命令

2011年9月26日 没有评论

java中可以通过Runtime来执行系统命令,大致操作如下:

Runtime rt = Runtime.getRuntime();
Process process = rt.exec("命令字符串");
//获取命令的输出
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = null;

while ((line = in.readLine()) != null) {
	System.out.println(line);
}

如果命令有错,把上述的process.getInputStream()替换成process.getErrorStream(),可以有效的获取操作系统给出的错误提示,帮我们分析命令出错的原因。

elipse的java项目获取项目的绝对路径

2011年9月26日 没有评论

在非web项目中需要获取项目在硬盘上的绝对路径,可以使用System.getProperty(“user.dir”)来获取。需要说明的事,这个值是运行java程序的当前目录,例如在D:\test下执行

java -classpath D:\workspace3.6\prj\target\mytest.jar;%classpath% com.demo.Test

这时得到的值是 D:\test

另外System.getProperty()参数大全如下:

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

本文参考了 http://yueguangyuan.iteye.com/blog/71940

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