[英]Runtime.exec() no output
运行4个“街道”流程的代码:
for (int i=0; i < NUM_STREETS; i++) {
Process process = runtime.exec("java -classpath \\bin trafficcircle.Street 1 2");
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null && !line.isEmpty()) {
System.out.println(line);
System.out.flush();
}
InputStream es = process.getErrorStream();
InputStreamReader esr = new InputStreamReader(es);
BufferedReader br2 = new BufferedReader(esr);
while ((line = br2.readLine()) != null && !line.isEmpty()) {
System.out.println(line);
System.out.flush();
}
int exitVal = process.waitFor();
System.out.println("Process exitValue: " + exitVal);
}
“街道”在哪里:
public class Street {
/**
* @param args
* 0 - Simulation run time
* 1 - Flow time interval
*/
public static void main(String[] args) {
System.out.println(args[0]);
System.out.println(args[1]);
System.out.flush();
}
}
打印输出:
Error: Could not find or load main class trafficcircle.Street
Process exitValue: 1
Error: Could not find or load main class trafficcircle.Street
Process exitValue: 1
Error: Could not find or load main class trafficcircle.Street
Process exitValue: 1
Error: Could not find or load main class trafficcircle.Street
Process exitValue: 1
我的Eclipse项目中的“ Street.class”位于包trafficcircle中的\\ bin下。 我以为如果没有找到Runtime.exec,它会首先抱怨...这是怎么回事?
我认为您遇到了要丢弃的错误。 尝试使用ProcessBuilder.redirectErrorStream(true);
当您尝试运行命令时,该命令未在外壳中运行,并且可能会收到您在命令行中未看到的错误。 我会明确使用
"java","-classpath","bin","trafficcircle.Street","1","2"`
并确保您收到任何错误消息。
另一种选择是使用像
"/bin/bash", "-c", "java -classpath bin trafficcircle.Street 1 2"
使用./bin(带点)来使用相对路径。
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