当前平台不支持桌面 API [英] Desktop API is not supported on the current platform
问题描述
我遇到了这个错误:
java.lang.UnsupportedOperationException: 当前平台不支持桌面 API
java.lang.UnsupportedOperationException: Desktop API is not supported on the current platform
我会从我的 Java 应用程序中打开一个文件.我用这个方法:
I would open a file from my java application. I use this method:
Desktop.getDesktop().open(new File(report.html"));
我该如何解决这个问题?
How can i solve this problem?
推荐答案
基本上，问题在于 Java 桌面集成在 Linux 上不能很好地工作.
Basically, the problem is that Java Desktop integration doesn't work well on Linux.
它旨在与 Windows 配合使用；有些东西适用于其他系统，但没有人真正关心为这些添加适当的支持.即使您安装了所需的gnome 库"，结果也会很差.
It was designed to work good with Windows; something works on other systems, but nobody really cared to add proper support for those. Even if you install the required 'gnome libraries', the results will be poor.
不久前我也遇到过同样的问题，于是想出了下面的课程.
I've faced the very same problem a while ago, and came up with the class below.
目标是通过使用系统特定命令来实现的:
The goal is achieved by using system-specific commands:
KDE: kde-open
GNOME: gnome-open
Any X-server system: xdg-open
MAC: open
Windows: explorer
如果这些都不起作用，它会尝试 Java Desktop 提供的实现.
因为这种方法通常会失败，所以只能尝试作为最后的手段.
If none of those works, it tries the implementation provided by Java Desktop.
Because this one usually fails, it's tried as the last resort.
DesktopApi 类
此类提供静态方法open、browse 和edit.
经测试可在 Linux(Kde 和 Gnome)、Windows 和 Mac 上运行.
This class provides static methods open, browse and edit.
It is tested to work on Linux (Kde and Gnome), Windows and Mac.
如果你使用它，请给我点赞.
package net.mightypork.rpack.utils;
import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
public class DesktopApi {
public static boolean browse(URI uri) {
if (openSystemSpecific(uri.toString())) return true;
if (browseDESKTOP(uri)) return true;
return false;
}
public static boolean open(File file) {
if (openSystemSpecific(file.getPath())) return true;
if (openDESKTOP(file)) return true;
return false;
}
public static boolean edit(File file) {
// you can try something like
// runCommand("gimp", "%s", file.getPath())
// based on user preferences.
if (openSystemSpecific(file.getPath())) return true;
if (editDESKTOP(file)) return true;
return false;
}
private static boolean openSystemSpecific(String what) {
EnumOS os = getOs();
if (os.isLinux()) {
if (runCommand("kde-open", "%s", what)) return true;
if (runCommand("gnome-open", "%s", what)) return true;
if (runCommand("xdg-open", "%s", what)) return true;
}
if (os.isMac()) {
if (runCommand("open", "%s", what)) return true;
}
if (os.isWindows()) {
if (runCommand("explorer", "%s", what)) return true;
}
return false;
}
private static boolean browseDESKTOP(URI uri) {
logOut("Trying to use Desktop.getDesktop().browse() with " + uri.toString());
try {
if (!Desktop.isDesktopSupported()) {
logErr("Platform is not supported.");
return false;
}
if (!Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
logErr("BROWSE is not supported.");
return false;
}
Desktop.getDesktop().browse(uri);
return true;
} catch (Throwable t) {
logErr("Error using desktop browse.", t);
return false;
}
}
private static boolean openDESKTOP(File file) {
logOut("Trying to use Desktop.getDesktop().open() with " + file.toString());
try {
if (!Desktop.isDesktopSupported()) {
logErr("Platform is not supported.");
return false;
}
if (!Desktop.getDesktop().isSupported(Desktop.Action.OPEN)) {
logErr("OPEN is not supported.");
return false;
}
Desktop.getDesktop().open(file);
return true;
} catch (Throwable t) {
logErr("Error using desktop open.", t);
return false;
}
}
private static boolean editDESKTOP(File file) {
logOut("Trying to use Desktop.getDesktop().edit() with " + file);
try {
if (!Desktop.isDesktopSupported()) {
logErr("Platform is not supported.");
return false;
}
if (!Desktop.getDesktop().isSupported(Desktop.Action.EDIT)) {
logErr("EDIT is not supported.");
return false;
}
Desktop.getDesktop().edit(file);
return true;
} catch (Throwable t) {
logErr("Error using desktop edit.", t);
return false;
}
}
private static boolean runCommand(String command, String args, String file) {
logOut("Trying to exec:\n cmd = " + command + "\n args = " + args + "\n %s = " + file);
String[] parts = prepareCommand(command, args, file);
try {
Process p = Runtime.getRuntime().exec(parts);
if (p == null) return false;
try {
int retval = p.exitValue();
if (retval == 0) {
logErr("Process ended immediately.");
return false;
} else {
logErr("Process crashed.");
return false;
}
} catch (IllegalThreadStateException itse) {
logErr("Process is running.");
return true;
}
} catch (IOException e) {
logErr("Error running command.", e);
return false;
}
}
private static String[] prepareCommand(String command, String args, String file) {
List<String> parts = new ArrayList<String>();
parts.add(command);
if (args != null) {
for (String s : args.split(" ")) {
s = String.format(s, file); // put in the filename thing
parts.add(s.trim());
}
}
return parts.toArray(new String[parts.size()]);
}
private static void logErr(String msg, Throwable t) {
System.err.println(msg);
t.printStackTrace();
}
private static void logErr(String msg) {
System.err.println(msg);
}
private static void logOut(String msg) {
System.out.println(msg);
}
public static enum EnumOS {
linux, macos, solaris, unknown, windows;
public boolean isLinux() {
return this == linux || this == solaris;
}
public boolean isMac() {
return this == macos;
}
public boolean isWindows() {
return this == windows;
}
}
public static EnumOS getOs() {
String s = System.getProperty("os.name").toLowerCase();
if (s.contains("win")) {
return EnumOS.windows;
}
if (s.contains("mac")) {
return EnumOS.macos;
}
if (s.contains("solaris")) {
return EnumOS.solaris;
}
if (s.contains("sunos")) {
return EnumOS.solaris;
}
if (s.contains("linux")) {
return EnumOS.linux;
}
if (s.contains("unix")) {
return EnumOS.linux;
} else {
return EnumOS.unknown;
}
}
}
这篇关于当前平台不支持桌面 API的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
