我遇到了这个错误:
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:
Desktop.getDesktop().open(new File(report.html"));
我该如何解决这个问题?
最佳答案
基本上,问题在于 Java 桌面集成在 Linux 上无法正常工作。
它被设计为在 Windows 上运行良好;有些东西在其他系统上有效,但没有人真正关心为这些系统添加适当的支持。即使您安装了所需的“gnome 库”,结果也会很差。
我不久前也遇到过同样的问题,并想出了下面的类(class)。
目标是通过使用系统特定的命令来实现的:
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。
因为这个通常会失败,所以它作为最后的手段进行了尝试。
DesktopApi 类
该类提供静态方法open
、browse
和edit
。
它经过测试可在 Linux(Kde 和 Gnome)、Windows 和 Mac 上运行。
如果你使用它,请给我信用。
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;
}
}
}
关于java - 当前平台不支持桌面 API,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18004150/