如何获得以像素为单位的屏幕分辨率（宽度 x 高度）？
我正在使用 JFrame 和 java swing 方法。
您可以通过
Toolkit.getScreenSize()Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();
在多显示器配置上，您应该使用这个：
GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int width = gd.getDisplayMode().getWidth();
int height = gd.getDisplayMode().getHeight();
如果您想获取 DPI 中的屏幕分辨率，则必须使用
getScreenResolution()Toolkit资源：
此代码将枚举系统上的图形设备（如果安装了多个显示器），您可以使用该信息来确定显示器关联性或自动放置（某些系统在应用程序运行时使用小型侧面显示器进行实时显示）在后台，这样的显示器可以通过尺寸、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
}
此电话将为您提供您想要的信息。
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
不幸的是，如果您有多个显示器，
Toolkit.getDefaultToolkit()您可以在以下位置访问屏幕设备的所有详细信息：
GraphicsDevice[] devices = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices();
// Windows scaled sizes (eg 1280x720 for my case at 150% scaling)
Rectangle bounds = devices[nnn].getDefaultConfiguration().getBounds();
// Display sizes (same as above at 100% scale, 1920x1080 for my case)
DisplayMode dm = devices[nnn].getDefaultConfiguration().getDevice().getDisplayMode();
Rectangle orig = new Rectangle((int)bounds.getX(), (int)bounds.getY(), dm.getWidth(), dm.getHeight());
我使用此方法读取每个
GraphicsDevice/** 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)
// For scaled sizes use .map(GraphicsConfiguration::getBounds) instead of:
.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();
}
以上代码在Windows和WSL下运行。如果您希望有一个返回缩放值的版本，只需切换上面的注释行即可。
这里有一些功能代码（Java 8），它返回最右边屏幕最右边边缘的 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()
这三个函数返回Java中的屏幕尺寸。此代码考虑了多显示器设置和任务栏。包含的函数有： 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;
}
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();
}
用途：
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);
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，其中左侧显示器设置为主显示器（在 Windows 设置中），该函数返回
java.awt.Rectangle[x=0,y=0,width=3840,height=1080]
在相同的设置中，但将右侧显示器设置为主显示器时，该函数返回
java.awt.Rectangle[x=-1920,y=0,width=3840,height=1080]
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);
有很多答案，但我仍然觉得它们不够充分，我的方法计算与屏幕尺寸相关的全局变量once并且还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;
}
}
然后你就可以随时使用，就像这样：
System.out.printf("LEFT=%d, RIGHT=%d%n", ScreenArea.LEFT, ScreenArea.RIGHT);
System.out.printf("TOP=%d, BOTTOM=%d%n", ScreenArea.TOP, ScreenArea.BOTTOM);
System.out.printf("MIN_WIDTH=%d, MAX_WIDTH=%d%n", ScreenArea.MIN_WIDTH, ScreenArea.MAX_WIDTH);
System.out.printf("MIN_HEIGHT=%d, MAX_HEIGHT=%d%n", ScreenArea.MIN_HEIGHT, ScreenArea.MAX_HEIGHT);
System.out.printf("SCREEN_AREA=%s%n", ScreenArea.RECTANGLE);
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]
int resolution =Toolkit.getDefaultToolkit().getScreenResolution();
System.out.println(resolution);
int screenResolution = Toolkit.getDefaultToolkit().getScreenResolution();
System.out.println(""+screenResolution);