Question

我正在尝试运行一个jar文件，但遇到了两个问题：

我只能从cmd运行它而不是双击它 - 从Eclipse导出它作为一个可运行的jar文件，我已经安装了java运行环境。当我双击它时没有任何反应
我在eclipse中导入的图像未导出项目

jar文件必须要求输入用户名/密码，然后打开图像，但不能。

代码：

import java.awt.Image;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class OpenImage {

public static void main(String[] args){
    String un;
    int pass;

    Image image = null;
    System.out.println("Welcome, please enter the username and password to open the image");
    Scanner scan = new Scanner(System.in);
    System.out.println("Username?:");
    un = scan.nextLine();
    System.out.println("Password?:");
    pass = scan.nextInt();

    if(un.equals("Hudhud") && pass==123){
        System.out.println("");
        System.out.println("Here you got the picture");
        try{
            File sourceimage = new File("index.jpg");
            image = ImageIO.read(sourceimage);
        }
        catch (IOException e){
            e.printStackTrace();
        }

        JFrame frame = new JFrame();
        frame.setSize(300, 300);
        JLabel label = new JLabel(new ImageIcon(image));
        frame.add(label);
        frame.setVisible(true);
    }
    else{
        System.out.println("You ain't the boss");
    }
 }

}

这是我的项目： http://www.filedropper.com/capture

Answer 1

为什么要从现有的ImageIcon创建新的ImageIcon？ KISS！
此外，Class.getResource不需要try / catch。

所以：



    import java.net.URL;
    import java.util.Scanner;

    import javax.swing.ImageIcon;
    import javax.swing.JFrame;
    import javax.swing.JLabel;

    public class OpenImage {

        private static final String IMG_FILE_PATH = "index.jpg";
        private static final String USERNAME = "Hudhud";
        private static final int PASSWORD = 123;

    public static void main(String[] args){
        String un;
        int pass;

        System.out.println("Welcome, please enter the username and password to open the image");
        Scanner scan = new Scanner(System.in);
        System.out.println("Username?:");
        un = scan.nextLine();
        System.out.println("Password?:");
        pass = scan.nextInt();

        if(un.equals(USERNAME) && pass==PASSWORD){
            System.out.println();
            System.out.println("Here you got the picture");
            URL url = OpenImage.class.getResource(IMG_FILE_PATH);
            ImageIcon icon = new ImageIcon(url);
            JFrame frame = new JFrame();
            frame.setSize(300, 300);
            JLabel label = new JLabel(icon);
            frame.add(label);
            frame.setVisible(true);
        }
        else{
            System.out.println("You ain't the boss");
        }
     }

    }

运行具有图像的jar文件

1 个答案: