在Java中激活其他进程的窗口 [英] Active other process's window in Java

问题描述

我有两个Java swing应用程序（意味着在两个JVM中运行）。有没有办法在它们之间切换？通过Java代码激活另一个应用程序的窗口？

I have two Java swing applications (means running in two JVM). Is there any way to switch between them? Active another application's window by Java code?

推荐答案

您可以尝试使用JNA。我会给你一些使用Maven的Windows代码（或多或少会用于其他系统）：
（对不起但我无法正确格式化）

You can try using JNA. I'll give you some code for Windows (more or less will be for other systems) using Maven: (sorry but I cannot get formatting right)

1. 创建Maven项目，并添加依赖项：
   

1. Create Maven project, and add dependencies:
   

<dependency>
    <groupId>net.java.dev.jna</groupId>
    <artifactId>jna</artifactId>
    <version>3.4.0</version>
</dependency>
<dependency>
    <groupId>net.java.dev.jna</groupId>
    <artifactId>platform</artifactId>
    <version>3.4.0</version>
</dependency>

创建界面

Create interface

public interface User32 extends StdCallLibrary {
    User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class, W32APIOptions.DEFAULT_OPTIONS);
    HWND GetParent(HWND hWnd);
    HWND FindWindow(String lpClassName, String lpWindowName);
    HWND SetFocus(HWND hWnd);
    HWND FindWindowEx(HWND hwndParent, HWND hwndChildAfter, String lpszClass, String lpszWindow);
    int GetWindowText(HWND hWnd, char[] lpString, int nMaxCount);
}

创建课程

Create class

public final class Win32WindowUtils {
    private static final int WIN_TITLE_MAX_SIZE = 512;

    public HWND GetWindowHandle(String strSearch, String strClass) {
        char[] lpString = new char[WIN_TITLE_MAX_SIZE];
        String strTitle;
        int iFind = -1;
        HWND hWnd = User32.INSTANCE.FindWindow(strClass, null);
        while(hWnd != null) {
            User32.INSTANCE.GetWindowText(hWnd, lpString, WIN_TITLE_MAX_SIZE);
            strTitle = new String(lpString);
            strTitle = strTitle.toUpperCase();
            iFind = strTitle.indexOf(strSearch);
            if(iFind != -1) {
                return hWnd;
            }
            hWnd = User32.INSTANCE.FindWindowEx(null, hWnd, strClass, null);
        }
        return hWnd;
    }
}

并调用

And invoke

User32.INSTANCE.SetFocus(Win32WindowUtils.GetWindowHandle(windowTitle.toUpperCase(), null);

当然 - windowTitle 是你的窗口标题（要聚焦的 String ）。

Of course - windowTitle is your window title (String) that you want to focus.

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