java - Process Builder 无法在 Windows 上运行

Question

我正在使用 Process Builder 在 Windows 上运行 ImageMagick 命令。由于某种原因，使用 Process Builder 大多数时候不会生成输出图像。当我使用 Runtime.getRuntime().exec 尝试相同的命令时，生成了输出。知道这是为什么吗？

String input="D:\\Koala.jpg";
String output = "D:\\ProcessBuilderOutput\\KoalaPNG.png";
commands.add("D:\\Program Files\\ImageMagick-6.8.6-Q16\\convert");
commands.add("-alpha off");
commands.add("-strip");
commands.add(input);
commands.add("-colorspace CMYK");
commands.add(output);
try{
    executeProcessCommand(commands);
    if(new File(output).exists() != true){ 
    System.out.println("output not generated");
    }
}catch (Exception e) {
    e.printStackTrace();
}
public static void executeProcessCommand(List<String> commands) throws Exception {
    Process proc = null;
    try {
        System.out.println("-executeProcessCommand: Trying to execute :- "+commands);
        ProcessBuilder processBuilder = new ProcessBuilder(commands);
        proc = processBuilder.start();
        proc.waitFor();
        System.out.println("- executeProcessCommand: Executed the command ");
    } catch (Exception e) {
        System.out.println(" - executeProcessCommand:" + e.getMessage());
    } finally {
        try {
            if(proc != null)
                proc.destroy();
        } catch (Exception e) {
            System.out.println("executeProcessCommand:"+ e.getMessage());
        }
    }
 }

Answer 1

将参数拆分到 ProcessBuilder。特别是将 commands.add("-alpha off"); 拆分为

commands.add("-alpha");
commands.add("off");

与 commands.add("-colorspace CMYK"); 类似，