appoutputcapture.java

编译原理的课程设计

package source;

import java.io.InputStream;
import java.io.OutputStream;
import javax.swing.JFrame;
import javax.swing.event.CaretListener;
import javax.swing.JTextArea;

public class AppOutputCapture
{
	private static Process process;
	final ConsoleTextArea cta;
	final JTextArea	jta;
	 
	public AppOutputCapture(final JTextArea jta, final ConsoleTextArea cta)
	{
		this.jta = jta;
		this.cta = cta;
	}
	
	public void getOutput(String[] args) throws Exception
	{
		if(args.length == 0) 
		{
	 		System.err.println("用法：java AppOutputCapture " +
			 						"<程序名字> {参数1 参数2 ...}");
	 		throw new Exception("创建线程失败!");
		}
		try 
		{
			// 启动命令行指定程序的新进程
			process = Runtime.getRuntime().exec(args);
		}
		catch(Exception e)
		{
			throw e;
		}

		// 获得新进程所写入的流
		final InputStream[] inStreams = new InputStream[]
		{
			process.getInputStream(),process.getErrorStream()
		};
		// 获得新进程所读出的流
		final OutputStream[] outStreams = new OutputStream[]
		{
			process.getOutputStream()
		};
		cta.setStreams(inStreams, outStreams, jta);
	}
}