我正在尝试从jar运行rsync。如果源路径中没有空格，则一切正常，但是当源路径中具有空格时，它将失败。我已经尝试了各种方法来转义空格，如手册页所述，例如source.replaceAll（“ \ s”，“ \\”）或source.replaceAll（“ \ s”，“？”），但没有有用。
当我输出正在运行的命令，然后从命令行运行完全相同的命令时，所有命令都可以正常工作。我看不到我在做什么错
我的代码如下：
RsyncCommandLine类
public class RsyncCommandLine {
/** Logger */
private static final Logger logger = LogManager.getLogger(RsyncCommandLine.class);
private CommandLine commandLine = null;
public String startRsync(String source, String destination) throws IOException {
commandLine = createCommandLine(source, destination);
CommandLineExecutorHelper helper = new CommandLineExecutorHelper();
CommandLineLogOutputStream outputStream = helper.executeCommandLine(commandLine);
validateResponse(outputStream);
return convertLinesToString(outputStream.getLines());
}
private void validateResponse(CommandLineLogOutputStream outputStream) throws IOException {
if (outputStream == null) {
logger.error("outputStream is not valid");
throw new IOException("Unable to use rsync. ");
} else if (outputStream.getExitCode() != 0) {
logger.error("Exit code: " + outputStream.getExitCode());
logger.error("Validate Response failed " + outputStream.getLines());
String errorMessage = exitCodeToErrorMessage(outputStream.getExitCode());
throw new IOException("Error with request. " + errorMessage);
} else if (outputStream.getLines() == null || outputStream.getLines().isEmpty()) {
logger.error("Rsync result: " + outputStream.getLines());
String errorMessage = "Unable to rsync. ";
throw new IOException(errorMessage);
}
}
private String exitCodeToErrorMessage(int exitCode) {
String errorMessage = null;
switch (exitCode) {
case 0: errorMessage="Success."; break;
case 1: errorMessage="Syntax or usage error."; break;
case 2: errorMessage="Protocol incompatibility."; break;
case 3: errorMessage="Errors selecting input/output files, dirs."; break;
case 4: errorMessage="Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the client and not by the server."; break;
case 5: errorMessage="Error starting client-server protocol."; break;
case 6: errorMessage="Daemon unable to append to log-file."; break;
case 10: errorMessage="Error in socket I/O."; break;
case 11: errorMessage="Error in file I/O."; break;
case 12: errorMessage="Error in rsync protocol data stream."; break;
case 13: errorMessage="Errors with program diagnostics."; break;
case 14: errorMessage="Error in IPC code."; break;
case 20: errorMessage="Received SIGUSR1 or SIGINT."; break;
case 21: errorMessage="Some error returned by waitpid()."; break;
case 22: errorMessage="Error allocating core memory buffers."; break;
case 23: errorMessage="Partial transfer due to error."; break;
case 24: errorMessage="Partial transfer due to vanished source files."; break;
case 25: errorMessage="The --max-delete limit stopped deletions."; break;
case 30: errorMessage="Timeout in data send/receive."; break;
case 35: errorMessage="Timeout waiting for daemon connection."; break;
default: errorMessage="Unrecognised error code.";
}
return errorMessage;
}
protected String convertLinesToString(List<String> lines) {
String result = null;
if (lines != null && !lines.isEmpty()) {
StringBuilder builder = new StringBuilder();
for (String line : lines) {
builder.append(line).append(" ");
}
result = builder.toString().trim();
}
return result;
}
protected CommandLine createCommandLine(String source, String destination) {
// rsync -rtvuch <source> <destination>
commandLine = new CommandLine("rsync");
commandLine.addArgument("-rtvuch");
String escapedSource = source.trim().replaceAll("\\s", "\\\\ ");
String escapedDestination = destination.trim().replaceAll("\\s", "\\\\ ");
commandLine.addArgument(source);
commandLine.addArgument(escapedDestination);
logger.debug("escapedSource " + escapedSource);
logger.debug("escapedDestination " + escapedDestination);
return commandLine;
}
}
CommandLineExecutorHelper类-
public class CommandLineExecutorHelper {
/** Logger */
private static final Logger logger = LogManager.getLogger(CommandLineExecutorHelper.class);
private DefaultExecutor executor = new DefaultExecutor();
private ExecuteWatchdog watchdog = new ExecuteWatchdog(10000);
private DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
public CommandLineExecutorHelper() {
executor.setWatchdog(watchdog);
}
public CommandLineLogOutputStream executeCommandLine(CommandLine commandLine) {
CommandLineLogOutputStream outputStream = new CommandLineLogOutputStream();
PumpStreamHandler pumpStreamHandler = new PumpStreamHandler(outputStream);
executor.setStreamHandler(pumpStreamHandler);
try {
executor.execute(commandLine, resultHandler);
resultHandler.waitFor();
outputStream.setExitCode(resultHandler.getExitValue());
logger.debug("\n\ncommandLine " + commandLine);
logger.debug("exit code " + resultHandler.getExitValue());
logger.debug("output " + outputStream.getLines());
} catch (InterruptedException e) {
outputStream.addErrorMessage(e.getMessage());
logger.error("executeCommandLine " + e.getMessage());
} catch (ExecuteException e) {
outputStream.addErrorMessage(e.getMessage());
logger.error("executeCommandLine " + e.getMessage());
} catch (IOException e) {
outputStream.addErrorMessage(e.getMessage());
logger.error("executeCommandLine " + e.getMessage());
} finally {
IOUtils.closeQuietly(outputStream);
}
return outputStream;
}
}
CommnadLineOutputStream类-
public class CommandLineLogOutputStream extends LogOutputStream {
private int exitCode = -1;
private final List<String> lines = new LinkedList<>();
private StringBuilder errorMessages = new StringBuilder();
/**
* @return the exitCode
*/
public int getExitCode() {
return exitCode;
}
/**
* @param exitCode the exitCode to set
*/
public void setExitCode(int exitCode) {
this.exitCode = exitCode;
}
/**
* @return the lines
*/
public List<String> getLines() {
return lines;
}
/**
* @return the errorMessages
*/
public StringBuilder getErrorMessages() {
return errorMessages;
}
/**
* @param errorMessages the errorMessages to set
*/
public void setErrorMessages(StringBuilder errorMessages) {
this.errorMessages = errorMessages;
}
public void addErrorMessage(String errorMessage) {
this.errorMessages.append(errorMessage);
}
@Override
protected void processLine(String line, int logLevel) {
lines.add(line);
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("CommandLineLogOutputStream [exitCode=").append(exitCode).append(", lines=").append(lines).append(", errorMessages=").append(errorMessages).append("]");
return builder.toString();
}
}
因此，当我在没有空格的情况下运行jar时，它会成功：
java -jar myjar.jar -source "/var/source"
输出命令是：
commandLine [rsync, -rtvuch, "/var/source", /var/dest]
当我对带有空格的路径运行同一jar时：
java -jar myjar.jar -source "/var/source with spaces"
我收到以下错误消息：
Exit code: 23
Validate Response failed [building file list ... donersync: link_stat "/Users/karen/"/var/source with spaces"" failed: No such file or directory (2), building file list ... donersync: link_stat "/Users/karen/"/var/source with spaces"" failed: No such file or directory (2), , sent 21 bytes received 20 bytes 82.00 bytes/sec, total size is 0 speedup is 0.00, rsync error: some files could not be transferred (code 23) at /BuildRoot/Library/Caches/com.apple.xbs/Sources/rsync/rsync-47/rsync/main.c(992) [sender=2.6.9]]
Unable to rsync Error with request. Partial transfer due to error.
从文件打开对话框中提取目标路径。
答案 0 :(得分：1)
经过各种输入后，我决定改用ProcessBuilder。然后，我使用以下代码将其工作：
CREATE DATABASE mydatabase_copy AS COPY OF mydatabase;
答案 1 :(得分：0)
您看到答案here了吗？
虽然有bug around quotes managements in Common Exec， 此answers suggests：
// When writing a command with space use double " cmdLine.addArgument(--grep=\"\"" + filter+"\"\"", false"\"\"",false);
答案 2 :(得分：0)
我认为Apache Commons Exec在这里有一个错误，不能正确处理带有空格的参数。这个公开的错误（与m4gic链接）有几个矛盾的解释和解决方法：https://issues.apache.org/jira/browse/EXEC-54
我建议重写您的代码以使用Java内置的“ Runtime.exec”功能以及命令行的String[]形式（或等效的java.lang.ProcessBuilder API）来绕过任何外壳转义和引用的问题。
您将不得不手动处理Apache Commons Exec对您隐藏的一些技术细节，例如stdout和stderr之间潜在的I / O死锁，但是很有可能处理这些问题，而我认为这是不可能的。可以让Apache在这里做您想做的事情。 Apache Commons Exec intr o讨论了其中一些问题。您应该可以在互联网上使用Runtime.exec或ProcessBuilder找到一些示例代码。 GL！