我试图在使用Runtime exec
和Process
的Java应用程序中执行系统命令。我做了一个简单的程序,仅用于演示,示例命令是javac
,它仅编译Java程序。使用该应用程序,只需选择要编译的文件,然后选择稍后将保存的输出文件夹。在Java应用程序中执行系统命令
下面是完整的程序代码:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
private static JFileChooser jFileChooser1, jFileChooser2;
public static void main(String[] args) {
JFrame jFrame = new JFrame();
jFrame.setSize(238, 62);
jFrame.setResizable(false);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel jPanel = new JPanel();
jPanel.setLayout(null);
jFileChooser1 = new JFileChooser();
jFileChooser2 = new JFileChooser();
JButton jButton1 = new JButton("File");
jButton1.setBounds(1, 1, 70, 25);
jButton1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jFileChooser1.setCurrentDirectory(new File(System.getProperty("user.dir")));
jFileChooser1.showOpenDialog(jFrame);
}
});
jPanel.add(jButton1);
JButton jButton2 = new JButton("Folder");
jButton2.setBounds(75, 1, 70, 25);
jButton2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jFileChooser2.setCurrentDirectory(new File(System.getProperty("user.dir")));
jFileChooser2.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
jFileChooser2.showOpenDialog(jFrame);
}
});
jPanel.add(jButton2);
JButton jButton3 = new JButton("Compile");
jButton3.setBounds(149, 1, 80, 25);
jButton3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
File selectedFile = jFileChooser1.getSelectedFile();
File selectedFolder = jFileChooser2.getSelectedFile();
String s = null;
try {
Process p = Runtime.getRuntime().exec("javac -d " +selectedFolder+ " " +selectedFile);
BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
while ((s = stdInput.readLine()) != null) {
System.out.println(s);
}
while ((s = stdError.readLine()) != null) {
System.out.println(s);
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
jPanel.add(jButton3);
jFrame.add(jPanel);
jFrame.setVisible(true);
}
}
但在我开发的实际应用中,我试图执行系统命令要求,我想保持应用程序中的二进制程序(本地资源文件)。例如,它位于assets
包中。因此,要访问的资源文件,我用这个代码:
URL binary = Test.class.getClassLoader().getResource("assets/binary.bin");
和示例使用/命令的语法是这样的:
"command -options " +binary+ " " +selectedFile+ " " +selectedFolder+ "
并在程序中:
...
try {
URL binary = Test.class.getClassLoader().getResource("assets/binary.bin");
Process p = Runtime.getRuntime().exec("command -options " +binary+ " " +selectedFile+ " " +selectedFolder+ ");
...
}
但是当我在我的IDE中尝试时出现错误:
Error: Unable to access jarfile file:/D:/Projects/Java/Test/build/classes/assets/binary.bin
那么这甚至有可能吗?我怎样才能做到这一点?任何帮助将不胜感激!
你应该使用ProcessBuilder和相关的类,并且从不使用Runtime :) –