在java中使用cmd命令打印文件

Question

我试图从我的 java swing 应用程序中打印一个记事本文件。 但是我似乎无法让它工作。

当我在命令提示符中输入此命令时，它会打印给定的记事本文件。 start /min notepad /p C:\score-programma\boem.txt

但是，当我尝试在 java 中执行此操作时，它说找不到文件。

java.io.IOException: Cannot run program "start": CreateProcess error=2, Het systeem kan het opgegeven bestand niet vinden at java.lang.ProcessBuilder.start(Unknown Source) at java.lang.Runtime.exec(Unknown Source) at java.lang.Runtime.exec(Unknown Source) at nl.daalhuisen.model.Model.print(Model.java:184) at Apl$1$1.actionPerformed(Apl.java:86) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$200(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Caused by: java.io.IOException: CreateProcess error=2, Het systeem kan het opgegeven bestand niet vinden at java.lang.ProcessImpl.create(Native Method) at java.lang.ProcessImpl.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) ... 41 more

这是我运行的 java 代码：

String[] args = {"start", "/min", "notepad", "/p", "C:\score-programma\boem.txt"}; Runtime.getRuntime().exec(args);

我也试过
String[] args = {"cmd.exe", "start", "/min", "notepad", "/p", "C:\score-programma\boem.txt"};

这不会产生同样的错误，但没有任何反应。 我在这里错过了什么？

Answer 1

start 是cmd 的内置命令。它不是可执行文件。你必须运行：

cmd /c start notepad /p c:\etc...

/c 标志对于告诉cmd 您正在尝试运行其他程序是必要的。如果您不传递它，那么start、notepad 等将被视为 cmd 本身的参数。

Answer 2

您可能想要使用类似下面的代码......并进行一些 Java 研究以添加“最小化”设置

package com.example.command;

import java.io.*;

public class JavaRunCommand {

    public static void main(String args[]) {
        String command = "notepad /p ";
        String filepath = "C:\\Temp\\readme.txt";
        String s = null;

        try {
            // using the Runtime exec method:
            Process p = Runtime.getRuntime().exec(command + filepath);
            BufferedReader stdInput = new BufferedReader(new InputStreamReader(
                    p.getInputStream()));
            BufferedReader stdError = new BufferedReader(new InputStreamReader(
                    p.getErrorStream()));

            // read the output from the command
            System.out.println("Here is the standard output of the command:\n");
            while ((s = stdInput.readLine()) != null) {
                System.out.println(s);
            }

            // read any errors from the attempted command
            System.out
                    .println("Here is the standard error of the command (if any):\n");
            while ((s = stdError.readLine()) != null) {
                System.out.println(s);
            }

            System.exit(0);
        } catch (IOException e) {
            System.out.println("exception happened - here's what I know: ");
            e.printStackTrace();
            System.exit(-1);
        }
    }
}