kotlin开发javaSwing（1.登录篇）

1）主页面：Login.kt

import main.component.BackgroundPanel
import main.utils.PathUtils
import org.jb2011.lnf.beautyeye.BeautyEyeLNFHelper
import java.io.File
import javax.imageio.ImageIO
import javax.swing.*

/**
 * @Auther: Desker
 * @Date: 2022/1/18 14:44
 * @Description:
 */

class Login(title: String) : JFrame(title) {
    init {
        try {
            BeautyEyeLNFHelper.launchBeautyEyeLNF();
            // 隐藏右上角设置按钮
            UIManager.put("RootPane.setupButtonVisible", false);
            // 将外观设置为系统外观.
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            createUi(title)
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }

    private fun createUi(title: String) {
        val jframe = JFrame(title)
        // 窗体大小固定
        jframe.isResizable = false
        jframe.defaultCloseOperation = EXIT_ON_CLOSE
        // 设置窗体图标
        jframe.iconImage = ImageIO.read(File(PathUtils.getImagePath("os.png")))

        // 背景面板
        val read = ImageIO.read(File(PathUtils.getImagePath("login.jpg")))
        val backgroundPanel = BackgroundPanel(read)

        // 用户名
        val userBox = Box.createHorizontalBox()
        userBox.add(JLabel("用户名"))
        userBox.add(Box.createHorizontalStrut(20))
        userBox.add(JTextField(20))

        // 密码
        val passBox = Box.createHorizontalBox()
        passBox.add(JLabel("密  码"))
        passBox.add(Box.createHorizontalStrut(20))
        passBox.add(JTextField(20))

        // 登录按钮
        val butBox = Box.createHorizontalBox()
        val okBtn = JButton("登录")
        butBox.add(okBtn)
        butBox.add(Box.createHorizontalStrut(100))
        val cancleBtn = JButton("取消")
        butBox.add(cancleBtn)

        val vbox = Box.createVerticalBox()
        vbox.add(Box.createVerticalStrut(100))
        vbox.add(userBox)
        vbox.add(Box.createVerticalStrut(20))
        vbox.add(passBox)
        vbox.add(Box.createVerticalStrut(30))
        vbox.add(butBox)

         backgroundPanel.add(vbox)
        jframe.add(backgroundPanel)
        jframe.setSize(read.width, read.height)
        // 启动后就在屏幕正中央
        jframe.setLocationRelativeTo(null);
        // 显示
        jframe.isVisible = true
    }
}

fun main(args: Array<String>) {
    Login("登录")
}

2）背景面板 BackgroundPanel.kt

import java.awt.Graphics
import java.awt.Image
import javax.swing.JPanel

/**
 * @Auther: Desker
 * @Date: 2022/1/18 15:44
 * @Description:
 */

class BackgroundPanel(backImage: Image) : JPanel() {
    var image = backImage

    override fun paintComponent(g: Graphics?) {
        super.paintComponent(g)
        if (g == null) return

        var x = 0
        var y = 0
        g.drawImage(image, x, y, this.height, this.width, this)
        while (true) {
            g.drawImage(image, x, y, this);
            if (x > this.width && y > this.height) break;
            //这段代码是为了保证在窗口大于图片时，图片仍能覆盖整个窗口
            if (x > this.width) {
                x = 0;
                y += image.getHeight(null);
            } else
                x += image.getWidth(null);
        }
    }
}

3）文件路径 PathUtils.kt

import java.nio.file.Paths

/**
 * @Auther: Desker
 * @Date: 2022/1/18 16:18
 * @Description:
 */
object PathUtils{
    fun getImagePath(name:String): String {
        // 当前工作目录
        val path = Paths.get("").toAbsolutePath().toString()
        return path+"\\src\\images\\"+ name
    }
}

4)swingUI相关jar (beautyeye_inf.jar)

链接：https://pan.baidu.com/s/1RWorazrlKYYFSGw2u_uiQQ
提取码：olxz