サンプル
OtherJava.java
別プロセスとして実行したいJava。 OtherJava.jar にするpublic class OtherJava {
public static void main(String[] args) throws Exception {
if (args == null || args.length < 1) {
throw new IllegalArgumentException("Illegal Arguments");
}
String input = args[0];
if (input.equals("error")) {
System.err.println("error...");
throw new Exception("error");
} else if (input.equals("return_code_10")) {
System.out.println("Return Code 10...");
System.exit(10);
}
System.out.println("Hello World, " + input);
}
}Main.java
呼び出し側import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main {
public static void main(String[] args) throws InterruptedException {
System.out.println("Test0");
execute("java", "-jar", "OtherJava.jar");
Thread.sleep(1000L);
System.out.println();
System.out.println("Test1");
execute("java", "-jar", "OtherJava.jar", "error");
Thread.sleep(1000L);
System.out.println();
System.out.println("Test2");
execute("java", "-jar", "OtherJava.jar", "return_code_10");
Thread.sleep(1000L);
System.out.println();
System.out.println("Test3");
execute("java", "-jar", "OtherJava.jar", "Mike");
Thread.sleep(1000L);
System.out.println();
System.out.println("Done");
}
private static void execute(String... commands) {
ProcessBuilder processBuilder = new ProcessBuilder(commands);
try {
Process process = processBuilder.start();
int result = process.waitFor();
System.out.println("Result Code : " + result);
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
String line;
while ((line = bufferedReader.readLine()) != null) {
System.out.println(line);
}
}
try (BufferedReader errorBufferedreader = new BufferedReader(new InputStreamReader(process.getErrorStream()))) {
String errorLine;
while ((errorLine = errorBufferedreader.readLine()) != null) {
System.err.println(errorLine);
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
出力結果
Test0 Result Code : 1 Exception in thread "main" java.lang.IllegalArgumentException: Illegal Arguments at com.sample.proc.OtherJava.main(OtherJava.java:6) Test1 Result Code : 1 error... Exception in thread "main" java.lang.Exception: error at com.sample.proc.OtherJava.main(OtherJava.java:12) Test2 Result Code : 10 Return Code 10... Test3 Result Code : 0 Hello World, Mike Done
参考文献
https://stackoverflow.com/questions/1320476/execute-another-jar-in-a-java-program独自のリターンコードを設定するのに参考にした
http://takuan93.blog62.fc2.com/blog-entry-10.html