无法使用Windows 7下的ProcessBuilder在Java中执行javac或其他命令行应用程序 [英] Can't execute javac or other command line applications in Java using ProcessBuilder under Windows 7

问题描述

我正在尝试使用ProcessBuilder从Java执行javac，但我没有输出，也没有任何反应。我尝试读取输入流（因为如果我不读它就会出现进程挂起的错误），但仍然没有结果。我最初将所有必需的参数传递给javac，但它没有工作，所以我把它简化为javac（应该打印帮助信息）。

I'm trying to execute javac from Java using ProcessBuilder but i get no output and nothing happens. I tried reading the input stream (as there is a bug where the process hangs if i don't read it) but still no results. I originally passed all required parameters to javac but it was not working, so i simplified it down to just javac (which should print the help message).

我试过运行
C：\ Windows \ System32 \ cmd.exe / c C：\\Program Files \\ Java \ jdk1.6.0_23 \ bin\javac.exe
C：\\程序文件\\ Java \ jdk1.6.0_23 \ bin \ javac.exe
并用双引号包围javac的整个路径但仍然什么都没有。

i tried running "C:\Windows\System32\cmd.exe /c C:\\"Program Files\"\Java\jdk1.6.0_23\bin\javac.exe" "C:\\"Program Files\"\Java\jdk1.6.0_23\bin\javac.exe" and surrounding the entire path to javac with double quotes but still nothing.

我收到错误

无法运行程序C：\ Windows \ System32 \ cmd.exe / c C：\Program Files\ Java \ jdk1.6.0_23\bin\javac.exe：CreateProcess error = 2，系统找不到指定的文件

Cannot run program "C:\Windows\System32\cmd.exe /c C:\"Program Files"\Java\jdk1.6.0_23\bin\javac.exe": CreateProcess error=2, The system cannot find the file specified

但如果我复制命令并从命令行运行它可以正常工作。

but if i copy the command and run it from the command line it works fine.

我知道使用JavaCompiler类来编译我的文件，但我宁愿首先修复此问题，因为我可以从Java运行任何dos应用程序或.bat文件。我可以运行像notepad.exe这样的GUI程序。

I am aware of using the JavaCompiler class to compile my files but i would prefer to get this problem fixed first as i can't run any dos application or .bat file from Java. I can run GUI programs like notepad.exe fine though.

String[]  commands = new String[]{
             "C:\\Windows\\System32\\cmd.exe  /c C:\\\"Program Files\"\\Java\\jdk1.6.0_23\\bin\\javac.exe"
          };

  logger.log(Level.INFO, "About to run javac with the command below:");
  String commandToOutput = "";
  for (String command : commands) {
     commandToOutput += command + " ";
  }
  logger.log(Level.INFO, commandToOutput);



  ProcessBuilder processBuilder = new ProcessBuilder(commands);
  Process p = processBuilder.start();

编辑2

String[] commands = new String[]{
         "C:\\\"Program Files\"\\Java\\jdk1.6.0_23\\bin\\javac.exe", "-d", "\"" + tempDir + "\"", "-classpath", classpath
      };

编辑3

为什么会这样第二个命令数组有效，但第一个不在下面。

why is it that the second commands array works but the first does not below.

//this gives me CreateProcess error=5, Access is denied
      commands = new String[]{
                 "C:\\\"Program Files\"\\Java\\jdk1.6.0_23\\bin\\javac.exe"
              };

//this works
      commands = new String[]{
                 "C:\\Windows\\System32\\cmd.exe",
                 "/c",
                 "C:\\\"Program Files\"\\Java\\jdk1.6.0_23\\bin\\javac.exe",
              };

推荐答案

传递给ProcessBuilder的字符串数组应包含一个每个数组元素的参数，而不是单个大字符串中的所有内容。

The string array that you pass to ProcessBuilder should contain one argument per array element, not everything in a single big string.

试试这个：

String[] commands = new String[] 
{
  "C:\\Windows\\System32\\cmd.exe", 
  "/c", 
  "C:\\\"Program Files\"\\Java\\jdk1.6.0_23\\bin\\javac.exe"
};

顺便说一句：没有必要调用cmd.exe，你可以直接将javac.exe传递给ProcessBuilder

Btw: there is no need to call cmd.exe, you can pass javac.exe directly to the ProcessBuilder

ProcessBuilder builder = new ProcessBuilder(
   "C:\\\"Program Files\"\\Java\\jdk1.6.0_23\\bin\\javac.exe", "\\Path\\To\\MyClass.java"
);

这篇关于无法使用Windows 7下的ProcessBuilder在Java中执行javac或其他命令行应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！