java-exec: A Java repository from xabolcs

What?

A simple library for executing a subprocess from within a Java program.

java-exec provides:

Simple capture of output as a string
Handling output as streaming lines
Piping the output to another stream
Error capture
Subprocess timeout

Examples

Simple output capture

CommandExecutor executor = new CommandExecutor(Arrays.asList("ls"));
String dirContents = executor.run();
System.out.println(dirContents);

Process output as lines

CommandExecutor executor = new CommandExecutor(Arrays.asList("ls"));
executor.run(new LineHandler() {
  public void handleLine(String line) {
    System.out.println(line);
  }
});

Stream output

CommandExecutor executor = new CommandExecutor(Arrays.asList("ls"));
executor.run(System.out);

Subprocess timeout

long cmdTimeout = 3000; // 3 seconds
CommandExecutor executor = new CommandExecutor(Arrays.asList("sleep", "5"), cmdTimeout);
try {
  executor.run();
} catch (CommandExecutorException e) {
  System.out.println("Caught exception: " + e.getMessage());
  // handle timeout if you like, however
  // CommandExecutorException extends RuntimeException, so
  // you can also let it kill your program if the
  // scenario cannot reasonably be handled
}

Copyright

Written by David Rice (david.rice at gmail.com)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.