CDE

Task/Execute-a-system-command/Java/execute-a-system-command-3.java

@@ -0,0 +1,64 @@
+import java.io.IOException;
+import java.io.InputStream;
+
+public class MainEntry {
+    public static void main(String[] args) {
+        // the command to execute
+        executeCmd("ls -oa");
+    }
+
+    private static void executeCmd(String string) {
+        InputStream pipedOut = null;
+        try {
+            Process aProcess = Runtime.getRuntime().exec(string);
+
+            // These two thread shall stop by themself when the process end
+            Thread pipeThread = new Thread(new StreamGobber(aProcess.getInputStream()));
+            Thread errorThread = new Thread(new StreamGobber(aProcess.getErrorStream()));
+
+            pipeThread.start();
+            errorThread.start();
+
+            aProcess.waitFor();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (InterruptedException ie) {
+            ie.printStackTrace();
+        }
+    }
+}
+
+//Replace the following thread with your intends reader
+class StreamGobber implements Runnable {
+
+    private InputStream Pipe;
+
+    public StreamGobber(InputStream pipe) {
+        if(pipe == null) {
+            throw new NullPointerException("bad pipe");
+        }
+        Pipe = pipe;
+    }
+
+    public void run() {
+        try {
+            byte buffer[] = new byte[2048];
+
+            int read = Pipe.read(buffer);
+            while(read >= 0) {
+                System.out.write(buffer, 0, read);
+
+                read = Pipe.read(buffer);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if(Pipe != null) {
+                try {
+                    Pipe.close();
+                } catch (IOException e) {
+                }
+            }
+        }
+    }
+}