如何检索可能的shell脚本退出代码，当Java默认执行器和命令行执行shell脚本？

Question

我正在使用DefaultExecutor执行shell脚本&

对于成功执行接收0退出值

，但如果失败或任何其他退出代码(如127,128,255等)从shell脚本中，没有收到相应的退出代码，而是得到IOException.

int iExitValue = 1;
CommandLine cmd = CommandLine.parse("sh /Users/DpakG/scripts/do_Database_Operations.sh");
DefaultExecutor oDefaultExecutor = new DefaultExecutor();
oDefaultExecutor.setExitValue(0);
try {
iExitValue = oDefaultExecutor.execute(cmd);
log.info("Script Exit Code: " + iExitValue);
} catch (IOException e) {
log.error("IOException occurred: ", e);
}

任何想法如何处理退出代码来执行特定的自定义操作?

Answer 1

DefaultExecutor::execute()的文档说它抛出

ExecuteException—子进程执行失败或子进程返回一个退出值表明失败

ExecuteException是IOException的子类，因此它会被你的代码捕获。如果您尝试(也)捕获正确的异常，您可以使用它的getExitValue()方法来获取退出状态。

int iExitValue = 1;
CommandLine cmd = CommandLine.parse("sh /Users/DpakG/scripts/do_Database_Operations.sh");
DefaultExecutor oDefaultExecutor = new DefaultExecutor();
oDefaultExecutor.setExitValue(0);
try {
iExitValue = oDefaultExecutor.execute(cmd);
log.info("Script succeeded with exit code " + iExitValue); // Always successful (0)
} catch (ExecuteException e) {
log.info("Script failed with exit code " + e.getExitValue());
} catch (IOException e) {
log.error("IOException occurred: ", e);
}

Answer 2

经过进一步探索，我终于找到了正确的答案。

成功为<<p> strong> 使用setExitValues()用int数组的成功码代替'setExitValue()'，用单个退出码作为整数值。

int[] codes = {0,127,128};
oDefaultExecutor.setExitValues(codes);

失败的剩余部分退出码将在ExecuteException块

中捕获

catch (ExecuteException exe) {
iExitValue = exe.getExitValue();
log.info("Script failed with exit code: " + iExitValue);
}

带解决方案的完整代码片段

int iExitValue = 1;
CommandLine cmd = CommandLine.parse("sh /Users/DpakG/scripts/do_Database_Operations.sh");
DefaultExecutor oDefaultExecutor = new DefaultExecutor();
int[] successCodes = {0,127,128};
oDefaultExecutor.setExitValues(successCodes);
try {
iExitValue = oDefaultExecutor.execute(cmd);
log.info("Script succeeded with exit code " + iExitValue); // Either 0, 127 or 128 
} catch (ExecuteException exe) {
iExitValue = exe.getExitValue();
log.info("Script failed with exit code: " + iExitValue);
} catch (IOException ie) {
log.error("IOException occurred: ", ie);
}