macosx swing设置JButton 快捷键

问题： macos 上 setMnemonic 快捷键无效解决： [crayon… Read More

Quarkus qute 的问题

问题： v1.9.0 报的错误有时完全不知道错在哪里!!! { index +1 == 10} 不行 { in… Read More

Quarkus panache demo

问题：解决： Article.java [crayon-67ebe248b2e6… Read More

奇怪个别 jar aliyun maven mirror 没有，但是 apache maven 有

问题：解决：只能暂时禁用 aliyun mirror ，应该是jar 太新了… Read More

旋转图片

解决：

    static BufferedImage rotateImg90(BufferedImage image, boolean left) {
        var ret = new BufferedImage(image.getHeight(), image.getWidth(), image.getType());
        Graphics2D g2d = (Graphics2D) ret.getGraphics();
        double rotationRequired = Math.toRadians(left ? 90 : -90);
        double locationX = image.getWidth() / 2;
        double locationY = image.getHeight() / 2;
        AffineTransform tx = AffineTransform.getRotateInstance(rotationRequired, locationX, locationY);
        AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);
        g2d.drawImage(image, op, 0, 0);
        g2d.dispose();
        return ret;
    }

static BufferedImage rotateImg90(BufferedImage image, boolean left) {

var ret = new BufferedImage(image.getHeight(), image.getWidth(), image.getType());

Graphics2D g2d = (Graphics2D) ret.getGraphics();

double rotationRequired = Math.toRadians(left ? 90 : -90);

double locationX = image.getWidth() / 2;

double locationY = image.getHeight() / 2;

AffineTransform tx = AffineTransform.getRotateInstance(rotationRequired, locationX, locationY);

AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);

g2d.drawImage(image, op, 0, 0);

g2d.dispose();

return ret;

}

注意 … Read More

Quarkus JAX-RS 上传文件

问题：解决：

    public final static class Form1 {
        @PartType(MediaType.APPLICATION_OCTET_STREAM)
        @FormParam("file")
        public InputStream f;
    }

    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public ArticleAttachment upload(@QueryParam("articleId") int articleId, @MultipartForm Form1 form1) throws IOException {
        System.out.println("articleId:" + articleId);
        final byte[] d = form1.f.readAllBytes();
        System.out.println("f:" + d.length);
        final File file = new File("a.jpg");
        System.out.println("file:" + file.getAbsolutePath());
        IOUtils.write(d, new FileOutputStream(file));
        return null;
    }

public final static class Form1 {

@PartType(MediaType.APPLICATION_OCTET_STREAM)

@FormParam("file")

public InputStream f;

}

@POST

@Consumes(MediaType.MULTIPART_FORM_DATA)

public ArticleAttachment upload(@QueryParam("articleId") int articleId, @MultipartForm Form1 form1) throws IOException {

System.out.println("articleId:" + articleId);

final byte[] d = form1.f.readAllBytes();

System.out.println("f:" + d.length);

final File file = new File("a.jpg");

System.out.println("file:" + file.getAbsolutePath());

IOUtils.write(d, new FileOutputStream(file));

return null;

}

puppeteer 输入中文

问题 page.type(‘input#aa’,’中文’ ) … Read More

jbang 演示，jshell 的替代品，把 Java 当作脚本执行

问题：解决： jbang 比 jshell 好可以直接引入 maven 依赖 … Read More

【转】在CentOS 7上切换默认的java版本

https://www.cnblogs.com/awpatp/p/13129899.html sudo upd… Read More

IT问题

程序员的疑难杂症录

月份：2020年10月