Java 将 Runtime exec() OutputStream 打印到控制台
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原文地址: http://stackoverflow.com/questions/3936023/
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Printing Runtime exec() OutputStream to console
提问by TheWolf
I am trying to get the OutputStreamof the Processinitiated by exec()to the console. How can this be done?
我正在尝试OutputStream将Process发起的exec()发送到控制台。如何才能做到这一点？
Here is some incomplete code:
下面是一些不完整的代码：
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.Reader;
public class RuntimeTests
{
public static void main(String[] args)
{
File path = new File("C:\Dir\Dir2");
String command = "cmd /c dir";
Reader rdr = null;
PrintStream prtStrm = System.out;
try
{
Runtime terminal = Runtime.getRuntime();
OutputStream rtm = terminal.exec(command, null, path).getOutputStream();
prtStrm = new PrintStream(rtm);
prtStrm.println();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
采纳答案by Eugene Kuleshov
You need to start a new thread that would read terminal output stream and copy it to the console, after you call process.waitFor()
在调用 process.waitFor() 之后，您需要启动一个新线程来读取终端输出流并将其复制到控制台
回答by Stijn Geukens
I believe this is what you're looking for:
我相信这就是你要找的：
String line;
Process p = Runtime.getRuntime().exec(...);
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
System.out.println(line);
}
input.close();
回答by Benjamin Gruenbaum
I recently ran into this problem and just wanted to mention that since java 7 the process builder apihas been expanded. This problem can now be solved with:
我最近遇到了这个问题，只想提一下，自 java 7 以来，进程构建器 api已经扩展。这个问题现在可以解决：
ProcessBuilder pb = new ProcessBuilder("yourcommand");
pb.redirectOutput(Redirect.INHERIT);
pb.redirectError(Redirect.INHERIT);
Process p = pb.start();
回答by samaitra
I faced the similar problem and I am using the following code.
我遇到了类似的问题，我正在使用以下代码。
Process p = Runtime.getRuntime().exec(".....");
p.waitFor();
String line;
BufferedReader error = new BufferedReader(new InputStreamReader(p.getErrorStream()));
while((line = error.readLine()) != null){
System.out.println(line);
}
error.close();
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while((line=input.readLine()) != null){
System.out.println(line);
}
input.close();
OutputStream outputStream = p.getOutputStream();
PrintStream printStream = new PrintStream(outputStream);
printStream.println();
printStream.flush();
printStream.close();
回答by yegor256
Try VerboseProcessfrom jcabi-log:
String output = new VerboseProcess(new ProcessBuilder("foo.bat")).stdout();
The class starts a background thread, listens to the output stream, and logs it.
该类启动一个后台线程，监听输出流并记录它。
回答by radiantRazor
If you can use org.apache.commons.io.IOUTils from commons-io,
如果您可以使用来自 commons-io 的 org.apache.commons.io.IOUTils，
System.out.println(IOUtils.toString(process.getInputStream()));
System.err.println(IOUtils.toString(process.getErrorStream()));
回答by Mohamed Anees A
I know this is a very old question, but a better alternate for the above answers would be
我知道这是一个非常古老的问题，但上述答案的更好替代方案是
ProcessBuilder builder = new ProcessBuilder(command);
builder.inheritIO();
Process p = builder.start();
From the docs of ProcessBuilder.inheritIO(),
从文档中ProcessBuilder.inheritIO()，
Sets the source and destination for subprocess standard I/O to be the same as those of the current Java process.
将子进程标准 I/O 的源和目标设置为与当前 Java 进程的源和目标相同。
Hope this helps someone!
希望这可以帮助某人！
