Java 在Spring批处理SystemCommandTasklet中使用shell命令

我想在spring batch systemCommandTasklet中运行此命令，但它不起作用

 tail -1 file1.txt > input_footer.txt && head -n -1 file1.txt > input_body.txt

代码：

        String Commmand = String.format("tail -1 %s > input_footer.txt && head -n -1 %s > input_body.txt", fileName.getFilename(),fileName.getFilename());

        systemCommandTasklet.setCommand(Commmand);

        systemCommandTasklet.setWorkingDirectory(woringDir);
        systemCommandTasklet.setTimeout(10000);
        systemCommandTasklet.setInterruptOnCancel(true);

未生成任何输出文件

有什么解决办法吗？

---

基本上，作为第一步，我想将正文和页脚分为两个文件。

我通过使用ProcessBuilder和MethodInvokingTaskletAdapter解决了这个问题

public ExitStatus processFile(String fileName, String workingDir) throws InterruptedException, IOException {

        boolean isWindows = System.getProperty("os.name").toLowerCase().startsWith("windows");
        logger.info("OS windows {} :", isWindows);
        String command = String.format("tail -1 %s > input_footer.txt && head -n -1 %s > input_body.txt", fileName, fileName);
        logger.info("command {} and working dir{} :", command, workingDir);
        ProcessBuilder builder = new ProcessBuilder();

        builder.command(bashPath, "-c", command);
        builder.directory(new File(workingDir));
        Process process = builder.start();
        StreamGobbler streamGobbler =
                new StreamGobbler(process.getInputStream(), System.out::println);
        Executors.newSingleThreadExecutor().submit(streamGobbler);
        int exitCode = process.waitFor();
        ExitStatus status = exitCode == 0 ? ExitStatus.COMPLETED : ExitStatus.FAILED;

        return status;
    }

 public MethodInvokingTaskletAdapter preProcessFileAdapter(@Value("#{jobExecutionContext['customerFile']}") String file, PreProcessFile preProcessFile)
    {
        String workingDir = FilenameUtils.getFullPath(file);
        String fileName = FilenameUtils.getName(file);

        MethodInvokingTaskletAdapter methodInvokingTaskletAdapter=new MethodInvokingTaskletAdapter();
        methodInvokingTaskletAdapter.setTargetObject(preProcessFile);
        methodInvokingTaskletAdapter.setTargetMethod("processFile");
        methodInvokingTaskletAdapter.setArguments(new String[]{fileName,workingDir});



 return methodInvokingTaskletAdapter;
    }

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我通过使用ProcessBuilder和MethodInvokingTaskletAdapter解决了这个问题

public ExitStatus processFile(String fileName, String workingDir) throws InterruptedException, IOException {

        boolean isWindows = System.getProperty("os.name").toLowerCase().startsWith("windows");
        logger.info("OS windows {} :", isWindows);
        String command = String.format("tail -1 %s > input_footer.txt && head -n -1 %s > input_body.txt", fileName, fileName);
        logger.info("command {} and working dir{} :", command, workingDir);
        ProcessBuilder builder = new ProcessBuilder();

        builder.command(bashPath, "-c", command);
        builder.directory(new File(workingDir));
        Process process = builder.start();
        StreamGobbler streamGobbler =
                new StreamGobbler(process.getInputStream(), System.out::println);
        Executors.newSingleThreadExecutor().submit(streamGobbler);
        int exitCode = process.waitFor();
        ExitStatus status = exitCode == 0 ? ExitStatus.COMPLETED : ExitStatus.FAILED;

        return status;
    }

 public MethodInvokingTaskletAdapter preProcessFileAdapter(@Value("#{jobExecutionContext['customerFile']}") String file, PreProcessFile preProcessFile)
    {
        String workingDir = FilenameUtils.getFullPath(file);
        String fileName = FilenameUtils.getName(file);

        MethodInvokingTaskletAdapter methodInvokingTaskletAdapter=new MethodInvokingTaskletAdapter();
        methodInvokingTaskletAdapter.setTargetObject(preProcessFile);
        methodInvokingTaskletAdapter.setTargetMethod("processFile");
        methodInvokingTaskletAdapter.setArguments(new String[]{fileName,workingDir});



 return methodInvokingTaskletAdapter;
    }

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我不确定这个问题与java或spring有何关系

head

和

tail

默认打印10行，这里您指定了1行。抱歉，更新了问题我不确定这个问题与java或spring的关系<代码>头部和

尾部

默认打印10行，这里您指定了1行。抱歉，更新了问题