Question

我正在编写一个java程序，它在某些时候执行cmd文件。两者都在同一目录中。

我正在使用ProcessBuilder，因为它更灵活。但是，当我运行此代码时，它失败了：

String current_directory = System.getProperty("user.dir");

 ProcessBuilder builder=new ProcessBuilder(current_directory+"\\"+ "myCmdFile.cmd");
 builder.directory(new File(current_directory));
 File log = new File("log.txt");
 builder.redirectErrorStream(true);
 builder.redirectOutput(Redirect.appendTo(log));
 Process process=builder.start();
 process.waitFor();
 System.out.println("CMD file executed");

我得到了这个例外：

java.io.IOException: Cannot run program "C:\test\myCmdFile.cmd" (in directory "C:\test"): No such file or directory
    at java.lang.ProcessBuilder.start(Unknown Source)
    at org.java.test.executeCmdFile(MyMainClass.java:189)
    at org.java.test.main(MyMainClass.java:70)
Caused by: java.io.IOException: No such file or directory   
    at java.lang.ProcessImpl.openForAtomicAppend(Native Method)
    at java.lang.ProcessImpl.newFileOutputStream(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)
    ... 3 more

然而，当我评论这些行而不是它的作用时：

  ProcessBuilder builder=new ProcessBuilder(current_directory+"\\"+ 
  "myCmdFile.cmd");
    //builder.directory(new File(current_directory));
    //File log = new File("log.txt");
    // builder.redirectErrorStream(true);
    // builder.redirectOutput(Redirect.appendTo(log));
    Process process=builder.start();
    process.waitFor();
    System.out.println("CMD file executed");

我需要这些行，因为我想要有日志消息。

Answer 1

我发现了我的错误......这是一个愚蠢的错误。这段代码实际上有效：

String current_directory = System.getProperty("user.dir");

 ProcessBuilder builder=new ProcessBuilder(current_directory+"\\"+ "myCmdFile.cmd");
 builder.directory(new File(current_directory));
 File log = new File("log.txt");
 builder.redirectErrorStream(true);
 builder.redirectOutput(Redirect.appendTo(log));
 Process process=builder.start();
 process.waitFor();
 System.out.println("CMD file executed");

问题在于这一行：

 File log = new File("log.txt");

在我的生产环境中，它是一条很长的路径（这是错误的），但为了演示目的，我在此处发布问题之前更改了它。我认为这个问题与cmd文件有关，异常告诉我整个时间......现在我给了一个正确的日志文件路径后就可以运行了..大家都是

java执行cmd文件失败

1 个答案: