public class ReadFromProcess
{
public static void main(String[] args)
{
BufferedReader br = null;
try
{
Process p = Runtime.getRuntime().exec("javac");
br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
String buff = null;
while((buff = br.readLine()) !=null)
{
System.out.println(buff);
}
}
catch(IOException ex)
{
ex.printStackTrace();
}
finally
{
try
{
if (br != null)
br.close();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
}
}
public class WriteToProcess
{
public static void main(String[] args)
{
PrintStream ps = null;
try
{
//运行java ReadStandard命令，返回运行该命令的子进程
Process p = Runtime.getRuntime().exec("java ReadStandard");
//以p进程的输出流创建PrintStream对象
//这个输出流对本程序是输出流，对p进程则是输入流）
ps = new PrintStream(p.getOutputStream());
//向ReadStandard程序写入内容，这些内容将被ReadStandard读取
ps.println("普通字符串");
ps.println(new WriteToProcess());
}
catch (IOException ex)
{
ex.printStackTrace();
}
finally
{
if (ps != null)
ps.close();
}
}
}
//定义一个ReadStandard类，该类可以接受标准输入，
//并将标准输入写入out.txt文件。
class ReadStandard
{
public static void main(String[] args) throws Exception
{
//使用System.in创建Scanner对象，用于获取标准输入
Scanner sc = new Scanner(System.in);
PrintStream ps = new PrintStream(
new FileOutputStream("out.txt"));
//增加下面一行将只把回车作为分隔符
sc.useDelimiter("\n");
//判断是否还有下一个输入项
while(sc.hasNext())
{
//输出输入项
ps.println("键盘输入的内容是：" + sc.next());
}
ps.close();
}
}