Runtime.getRuntime()

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  http://1504745673.blogbus.com/logs/77395808.html
  
  假如要在java程序里执行一条linux可以用下面的写法Java代码
  
  Processprocess=Runtime.getRuntime().exec(cmd);
  
  process.waitFor();
  
  Processprocess=Runtime.getRuntime().exec(cmd);process.waitFor();
  
  但是当碰到像cd这样的命令时，上面的这种写法切不管用，很多时候我们以为是命令输错了或是文件找不到。
  
  现在提供一种新的执行命令方法：Java代码
  
  Filewd=newFile("/bin");
  
  System.out.println(wd);
  
  Processproc=null;
  
  try{
  
  proc=runtime.getruntime().exec("/bin/bash",null,wd);
  
  }
  
  catch(IOExceptione){
  
  e.printStackTrace();
  
  }
  
  if(proc!=null){
  
  BufferedReaderin=newBufferedReader(newInputStreamReader(proc.getInputStream()));
  
  PrintWriterout=newPrintWriter(newBufferedWriter(newOutputStreamWriter(proc.getOutputStream())),true);
  
  out.println("cd..");
  
  out.println("pwd");
  
  out.println("exit");
  
  try{
  
  Stringline;
  
  while((line=in.readLine())!=null){
  
  System.out.println(line);
  
  }
  
  proc.waitFor();
  
  in.close();
  
  out.close();
  
  proc.destroy();
  
  }
  
  catch(Exceptione){
  
  e.printStackTrace();
  
  }}
  
  Filewd=newFile("/bin");System.out.println(wd);Processproc=null;try{proc=runtime.getruntime().exec("/bin/bash",null,wd);}catch(IOExceptione){e.printStackTrace();}if(proc!=null){BufferedReaderin=newBufferedReader(newInputStreamReader(proc.getInputStream()));PrintWriterout=newPrintWriter(newBufferedWriter(newOutputStreamWriter(proc.getOutputStream())),true);out.println("cd..");out.println("pwd");out.println("exit");try{Stringline;while((line=in.readLine())!=null){System.out.println(line);}proc.waitFor();in.close();out.close();proc.destroy();}catch(Exceptione){e.printStackTrace();}}