如何在java中获得屏幕分辨率？

Question

如何获得以像素为单位的屏幕分辨率（宽 x 高）？

我正在使用 JFrame 和 java swing 方法。

Answer 1

您可以使用Toolkit.getScreenSize()方法获取屏幕尺寸。

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();

---

在多显示器配置中，你应该使用这个：

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int width = gd.getDisplayMode().getWidth();
int height = gd.getDisplayMode().getHeight();

---

如果要获得 DPI 中的屏幕分辨率，则必须使用Toolkit上的getScreenResolution()方法。

---

资源 ：

• javadoc - Toolkit.getScreenSize()
• Java 错误 5100801 - Toolkit.getScreenSize() 在 multimon、linux 上没有返回正确的维度

Answer 2

此代码将枚举系统上的图形设备（如果安装了多个监视器），您可以使用该信息来确定监视器关联或自动放置（某些系统在应用程序运行时使用小型侧监视器进行实时显示）背景，这样的显示器可以通过大小、屏幕颜色等来识别）：

// Test if each monitor will support my app's window
// Iterate through each monitor and see what size each is
GraphicsEnvironment ge      = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[]    gs      = ge.getScreenDevices();
Dimension           mySize  = new Dimension(myWidth, myHeight);
Dimension           maxSize = new Dimension(minRequiredWidth, minRequiredHeight);
for (int i = 0; i < gs.length; i++)
{
    DisplayMode dm = gs[i].getDisplayMode();
    if (dm.getWidth() > maxSize.getWidth() && dm.getHeight() > maxSize.getHeight())
    {   // Update the max size found on this monitor
        maxSize.setSize(dm.getWidth(), dm.getHeight());
    }

    // Do test if it will work here
}

Answer 3

这个电话会给你你想要的信息。

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

Answer 4

这是一些功能代码（Java 8），它返回最右侧屏幕最右侧边缘的 x 位置。 如果没有找到屏幕，则返回 0。

  GraphicsDevice devices[];

  devices = GraphicsEnvironment.
     getLocalGraphicsEnvironment().
     getScreenDevices();

  return Stream.
     of(devices).
     map(GraphicsDevice::getDefaultConfiguration).
     map(GraphicsConfiguration::getBounds).
     mapToInt(bounds -> bounds.x + bounds.width).
     max().
     orElse(0);

这里是 JavaDoc 的链接。

GraphicsEnvironment.getLocalGraphicsEnvironment()
GraphicsEnvironment.getScreenDevices()
GraphicsDevice.getDefaultConfiguration()
GraphicsConfiguration.getBounds()

Answer 5

这是给定组件当前分配的屏幕分辨率（类似于根窗口的大部分在该屏幕上可见）。

public Rectangle getCurrentScreenBounds(Component component) {
    return component.getGraphicsConfiguration().getBounds();
}

用法：

Rectangle currentScreen = getCurrentScreenBounds(frameOrWhateverComponent);
int currentScreenWidth = currentScreen.width // current screen width
int currentScreenHeight = currentScreen.height // current screen height
// absolute coordinate of current screen > 0 if left of this screen are further screens
int xOfCurrentScreen = currentScreen.x

如果你想尊重工具栏等，你也需要用这个来计算：

GraphicsConfiguration gc = component.getGraphicsConfiguration();
Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets(gc);

Answer 6

这三个函数在 Java 中返回屏幕大小。 此代码说明多显示器设置和任务栏。 包含的函数是： getScreenInsets() 、 getScreenWorkingArea()和getScreenTotalArea() 。

代码：

/**
 * getScreenInsets, This returns the insets of the screen, which are defined by any task bars
 * that have been set up by the user. This function accounts for multi-monitor setups. If a
 * window is supplied, then the the monitor that contains the window will be used. If a window
 * is not supplied, then the primary monitor will be used.
 */
static public Insets getScreenInsets(Window windowOrNull) {
    Insets insets;
    if (windowOrNull == null) {
        insets = Toolkit.getDefaultToolkit().getScreenInsets(GraphicsEnvironment
                .getLocalGraphicsEnvironment().getDefaultScreenDevice()
                .getDefaultConfiguration());
    } else {
        insets = windowOrNull.getToolkit().getScreenInsets(
                windowOrNull.getGraphicsConfiguration());
    }
    return insets;
}

/**
 * getScreenWorkingArea, This returns the working area of the screen. (The working area excludes
 * any task bars.) This function accounts for multi-monitor setups. If a window is supplied,
 * then the the monitor that contains the window will be used. If a window is not supplied, then
 * the primary monitor will be used.
 */
static public Rectangle getScreenWorkingArea(Window windowOrNull) {
    Insets insets;
    Rectangle bounds;
    if (windowOrNull == null) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        insets = Toolkit.getDefaultToolkit().getScreenInsets(ge.getDefaultScreenDevice()
                .getDefaultConfiguration());
        bounds = ge.getDefaultScreenDevice().getDefaultConfiguration().getBounds();
    } else {
        GraphicsConfiguration gc = windowOrNull.getGraphicsConfiguration();
        insets = windowOrNull.getToolkit().getScreenInsets(gc);
        bounds = gc.getBounds();
    }
    bounds.x += insets.left;
    bounds.y += insets.top;
    bounds.width -= (insets.left + insets.right);
    bounds.height -= (insets.top + insets.bottom);
    return bounds;
}

/**
 * getScreenTotalArea, This returns the total area of the screen. (The total area includes any
 * task bars.) This function accounts for multi-monitor setups. If a window is supplied, then
 * the the monitor that contains the window will be used. If a window is not supplied, then the
 * primary monitor will be used.
 */
static public Rectangle getScreenTotalArea(Window windowOrNull) {
    Rectangle bounds;
    if (windowOrNull == null) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        bounds = ge.getDefaultScreenDevice().getDefaultConfiguration().getBounds();
    } else {
        GraphicsConfiguration gc = windowOrNull.getGraphicsConfiguration();
        bounds = gc.getBounds();
    }
    return bounds;
}

Answer 7

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();
framemain.setSize((int)width,(int)height);
framemain.setResizable(true);
framemain.setExtendedState(JFrame.MAXIMIZED_BOTH);

Answer 8

int resolution =Toolkit.getDefaultToolkit().getScreenResolution();

System.out.println(resolution);

Answer 9

这是我经常使用的一段代码。 它返回完整的可用屏幕区域（即使在多显示器设置上），同时保留本机显示器位置。

public static Rectangle getMaximumScreenBounds() {
    int minx=0, miny=0, maxx=0, maxy=0;
    GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
    for(GraphicsDevice device : environment.getScreenDevices()){
        Rectangle bounds = device.getDefaultConfiguration().getBounds();
        minx = Math.min(minx, bounds.x);
        miny = Math.min(miny, bounds.y);
        maxx = Math.max(maxx,  bounds.x+bounds.width);
        maxy = Math.max(maxy, bounds.y+bounds.height);
    }
    return new Rectangle(minx, miny, maxx-minx, maxy-miny);
}

在具有两个全高清显示器的计算机上，其中左侧一个被设置为主显示器（在 Windows 设置中），该函数返回

java.awt.Rectangle[x=0,y=0,width=3840,height=1080]

在相同的设置下，但将正确的监视器设置为主监视器，函数返回

java.awt.Rectangle[x=-1920,y=0,width=3840,height=1080]

Answer 10

int screenResolution = Toolkit.getDefaultToolkit().getScreenResolution();
System.out.println(""+screenResolution);

Answer 11

有很多答案，但我仍然觉得它们还不够，我的方法计算一次与屏幕尺寸相关的全局变量，并使用所有显示器的单个循环：

public final class ScreenArea {
    public static final Rectangle RECTANGLE;
    public static final int 
        LEFT, RIGHT, 
        TOP, BOTTOM, 
        MIN_WIDTH, MAX_WIDTH, 
        MIN_HEIGHT, MAX_HEIGHT, 
        TOTAL_WIDTH, TOTAL_HEIGHT;
    
    static {
        // Initialise local vars
        int left, right, top, bottom, minWidth, maxWidth, minHeight, maxHeight;
        left = top = minWidth = minHeight = Integer.MAX_VALUE;
        right = bottom = maxWidth = maxHeight = Integer.MIN_VALUE;
        // In a single loop process all bounds
        Rectangle bounds;
        for (GraphicsDevice device : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()) {
            bounds = device.getDefaultConfiguration().getBounds();
            if (left > bounds.x)
                left = bounds.x;
            if (right < bounds.x + bounds.width)
                right = bounds.x + bounds.width;
            if (top > bounds.y)
                top = bounds.y;
            if (bottom < bounds.y + bounds.height)
                bottom = bounds.y + bounds.height;
            if (minWidth > bounds.width)
                minWidth = bounds.width;
            if (maxWidth < bounds.width)
                maxWidth = bounds.width;
            if (minHeight > bounds.height)
                minHeight = bounds.height;
            if (maxHeight < bounds.height)
                maxHeight = bounds.height;
        }
        TOTAL_WIDTH = right - left;
        TOTAL_HEIGHT = bottom - top;
        RECTANGLE = new Rectangle(TOTAL_WIDTH, TOTAL_HEIGHT);
        // Transfer local to immutable global vars
        LEFT = left; RIGHT = right; TOP = top; BOTTOM = bottom;
        MIN_WIDTH = minWidth; MAX_WIDTH = maxWidth;
        MIN_HEIGHT = minHeight; MAX_HEIGHT = maxHeight;
    }
}

然后你可以随时使用，就像这样：

System.out.printf("LEFT=%d, ", ScreenArea.LEFT);
System.out.printf("RIGHT=%d%n", ScreenArea.RIGHT);
System.out.printf("TOP=%d, ", ScreenArea.TOP);
System.out.printf("BOTTOM=%d%n", ScreenArea.BOTTOM);
System.out.printf("MIN_WIDTH=%d, ", ScreenArea.MIN_WIDTH);
System.out.printf("MAX_WIDTH=%d%n", ScreenArea.MAX_WIDTH);
System.out.printf("MIN_HEIGHT=%d, ", ScreenArea.MIN_HEIGHT);
System.out.printf("MAX_HEIGHT=%d%n", ScreenArea.MAX_HEIGHT);
System.out.printf("SCREEN_AREA=%s%n", ScreenArea.RECTANGLE);

它在我的双显示器设置上打印：

LEFT=0, RIGHT=3840
TOP=0, BOTTOM=1080
MIN_WIDTH=1920, MAX_WIDTH=1920
MIN_HEIGHT=1080, MAX_HEIGHT=1080
SCREEN_AREA=java.awt.Rectangle[x=0,y=0,width=3840,height=1080]

Answer 12

不幸的是，如果您有多个显示器， Toolkit.getDefaultToolkit()没有帮助，并且在 Windows 上，如果您将字体设置“缩放和布局”从 100% 更改为缩放值，它也会报告缩放值。 例如，在 150% 字体比例下，我的 1920x1080 屏幕被报告为 1280x720，这（无益地）改变了我的应用程序使用的分辨率。

相反，我使用此方法读取每个GraphicsDevice的默认显示模式以访问原始屏幕位置+尺寸，并返回按每个屏幕左->右 X 位置顺序排序的矩形集：

/** Get actual screen display sizes, ignores Windows font scaling, sort left to right */
public static List<Rectangle> getDisplays() {
    return Arrays.stream(GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices())
           .map(GraphicsDevice::getDefaultConfiguration)
           .map(c -> {
                var dm = c.getDevice().getDisplayMode();
                var bounds = c.getBounds();
                return new Rectangle((int)bounds.getX(), (int)bounds.getY(), dm.getWidth(), dm.getHeight());
        })
        .sorted(Comparator.comparing(Rectangle::getX))
        .toList();
}

上面的代码在 Windows 和 WSL 下运行。