java执行cmd文件失败

Question

我正在编写一个 java 程序，它会在某个时候执行 cmd 文件。两者都在同一个目录中。

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

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");

我得到这个异常：

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

但是，当我注释掉这些行时，它起作用了：

  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……这段代码确实有效：

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");

问题出在这一行：

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

在我的生产环境中，这是一条很长的路径（这是错误的），但是出于演示目的，我在将问题发布到此处之前对其进行了更改。我认为问题与 cmd 文件有关，异常告诉我整个时间......现在在我为日志文件提供正确的路径后它工作......谢谢大家

java执行cmd文件失败

java execute cmd file fails

java

cmd

processbuilder