Java使用Runtime.getRuntime().exec()时的运行输出问题解决

最新推荐文章于 2024-04-29 10:33:26 发布

原创最新推荐文章于 2024-04-29 10:33:26 发布 · 1.1w 阅读

3 ·

CC 4.0 BY-SA版权

本文介绍如何使用Java的Runtime.getRuntime().exec()方法启动外部进程，并通过自定义StreamHandler类来获取标准输出和错误输出流，解决输出流读取问题。

问题：在Java中使用Runtime.getRuntime().exec()启动一个进程，发现该进程成功启动，但无法获得该进程的打印输出，网上浏览一番，发现一方案，经验证可行，整理一下贴出来备忘。

*Main

public class StreamOutputTest{

public static void main(String[] args)

{

try
{
Runtime runtime = Runtime.getRuntime();
final Process process = runtime.exec(property.get("snetfullpath").toString());

StreamHandler errorStreamHandler = new StreamHandler(process.getErrorStream(), "ERROR");
errorStreamHandler.start();
StreamHandler outputStreamHandler = new StreamHandler(process.getInputStream(), "STDOUT");
outputStreamHandler.start();
}
catch (IOException ex)
{
Logger.getLogger(StreamOutputTest.class.getName()).log(Level.SEVERE, null, ex);
}

}

*StreamHandler class

public class StreamHandler extends Thread
{
InputStream m_inputStream;
String m_type;

public StreamHandler(InputStream is, String type)
{
this.m_inputStream = is;
this.m_type = type;
}

@Override
public void run()

{
InputStreamReader isr = null;
BufferedReader br = null;

try
{

//设置编码方式，否则输出中文时容易乱码
isr = new InputStreamReader(m_inputStream, "GBK");
br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
{
System.out.println("PRINT > " + m_type + " : " + line);
}
}
catch (IOException ioe)
{
ioe.printStackTrace();
}
finally
{
try
{
br.close();
isr.close();
}
catch (IOException ex)
{
Logger.getLogger(StreamHandler.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}