writetoprocess.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.util.*;
import java.io.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
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();
	}
}