我想关闭java程序中特定URL的打开Web浏览器/浏览器选项卡.
我可以使用java中的Desktop API在Internet Explorer中打开URL.
下面是在IE中打开浏览器的代码片段
java.awt.Desktop desktop = java.awt.Desktop.getDesktop();
desktop.browse(new java.net.URI("http://www.xyzz.com"));
现在,当我再次运行程序时,我想确保在浏览器中没有已打开上述URL的实例.如果是这样,请关闭它并在新的TAB或浏览器窗口中再次打开它.这可能看起来很奇怪.
我知道应该解决这个问题的基本方法是,我们需要识别进程并将其终止,然后再次调用上面的代码.
任何建议都是受欢迎的.
解决方法:
我怀疑你可以用桌面做很多事情,因为你没有得到任何关于已启动过程的参考.
我过去曾经使用过这种技术(在Java 6之前没有Desktop的地方),因为它适用于Process,你应该可以杀掉它.
public static void openURL(String url) {
StringBuilder sb = new StringBuilder();
if (System.getProperty("os.name").indexOf("Windows")>-1) {
String command = null;
String urlLC = url.toLowerCase();
if (urlLC.startsWith("https")) {
command = WindowsCommandRetriever.getCommandForFileType("https");
} else if (urlLC.startsWith("http")) {
command = WindowsCommandRetriever.getCommandForFileType("http");
}
if (command == null) {
command = WindowsCommandRetriever.commandForExtension(".html");
}
if (command.indexOf("%1") > -1) {
sb.append(command.substring(0, command.indexOf("%1")));
sb.append(url);
sb.append(command.substring(command.indexOf("%1") + "%1".length()));
} else {
sb.append(command).append(' ');
sb.append('"');
sb.append(url);
sb.append('"');
}
} else {
sb.append("open ");
sb.append(url);
}
try {
final Process p = Runtime.getRuntime().exec(sb.toString());
// Here you have the process. You can destroy it if you want
// You need to figure out how you are going to handle this here.
} catch (IOException e1) {
e1.printStackTrace();
System.err.println("Error while executing " + sb.toString());
}
}
和WindowsCommandRetriever：
/*
* (c) Copyright 2010-2011 AgileBirds
*
* This file is part of OpenFlexo.
*
* OpenFlexo is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* OpenFlexo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
*
*/
public class WindowsCommandRetriever {
/**
*
* @param extension
* the file extension (with or without the preceding '.')
* @return the command to execute for the specified <code>extension</code> or null if there are no associated command
*/
public static String commandForExtension(String extension) {
String regKey = "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\" + extension;
String fileType = WinRegistryAccess.getRegistryValue(regKey, "ProgID", WinRegistryAccess.REG_SZ_TOKEN);
if (fileType == null) {
StringBuilder sb = new StringBuilder("cmd /C assoc ");
sb.append(extension.startsWith(".") ? extension : "." + extension);
ConsoleReader reader;
try {
Process process = Runtime.getRuntime().exec(sb.toString());
reader = new ConsoleReader(process.getInputStream());
reader.start();
process.waitFor();
reader.join();
} catch (IOException e) {
e.printStackTrace();
return null;
} catch (InterruptedException e) {
e.printStackTrace();
return null;
}
String result = reader.getResult();
if (result.indexOf("=") > -1) {
fileType = result.substring(result.indexOf("=") + 1).trim();
}
}
if (fileType == null) {
return null;
}
return getCommandForFileType(fileType);
}
public static String getCommandForFileType(String fileType) {
String path = "HKEY_CLASSES_ROOT\\" + fileType + "\\shell\\open\\command";
return WinRegistryAccess.getRegistryValue(path, null, WinRegistryAccess.REG_SZ_TOKEN);
}
}
/*
* (c) Copyright 2010-2011 AgileBirds
*
* This file is part of OpenFlexo.
*
* OpenFlexo is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* OpenFlexo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
*
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
public class WinRegistryAccess {
private static final String REGQUERY_UTIL = "reg query ";
public static final String REG_SZ_TOKEN = "REG_SZ";
public static final String REG_BINARY = "REG_BINARY";
public static final String REG_DWORD_TOKEN = "REG_DWORD";
/**
* Returns the value for an attribute of the registry in Windows. If you want to now the processor speed of the machine, you will pass
* the following path: "HKLM\HARDWARE\DESCRIPTION\System\CentralProcessor\0" and the following attribute name: ~MHz
*
* @param path
* - the registry path to the desired value
* @param attributeName
* - the name of the attribute or null for the default
* @param attributeType
* - the type of attribute (DWORD/SZ/...) default is REG_SZ
* @return - the value for the attribute located in the given path
*/
public static String getRegistryValue(String path, String attributeName, String attributeType) {
if (attributeType == null) {
attributeType = REG_SZ_TOKEN;
}
try {
if (!path.startsWith("\"")) {
path = "\"" + path + "\"";
}
StringBuilder sb = new StringBuilder();
sb.append(REGQUERY_UTIL);
sb.append(path);
sb.append(' ');
if (attributeName != null) {
sb.append("/v ");
sb.append(attributeName);
} else {
sb.append("/ve");
}
Process process = Runtime.getRuntime().exec(sb.toString());
ConsoleReader reader = new ConsoleReader(process.getInputStream());
reader.start();
process.waitFor();
reader.join();
String result = reader.getResult();
int p = result.indexOf(attributeType);
if (p == -1) {
return null;
}
return result.substring(p + attributeType.length()).trim();
} catch (Exception e) {
return null;
}
}
public static class ConsoleReader extends Thread {
private InputStream is;
private StringWriter sw;
ConsoleReader(InputStream is) {
this.is = is;
sw = new StringWriter();
}
@Override
public void run() {
try {
int c;
while ((c = is.read()) != -1) {
sw.write(c);
}
} catch (IOException e) {
;
}
}
String getResult() {
return sw.toString();
}
}
public static String getJDKHome() {
String key = "\"HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\"";
String currentVersionAtt = "CurrentVersion";
String javaHomeAtt = "JavaHome";
String res1 = getRegistryValue(key, currentVersionAtt, null);
String res2 = getRegistryValue(key + "\\" + res1, javaHomeAtt, null);
return res2;
}
public static void main(String s[]) {
String key = "\"HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\"";
String currentVersionAtt = "CurrentVersion";
String javaHomeAtt = "JavaHome";
String res1 = getRegistryValue(key, currentVersionAtt, null);
String res2 = getRegistryValue(key + "\\" + res1, javaHomeAtt, null);
System.out.println("CurrentVersion '" + res1 + "'");
System.out.println("JavaHome '" + res2 + "'");
}
}