java擷取web容器地址的方法

tomcat本地地址 E:\soft4develop\apache-tomcat-6.0.18

System.getProperty("user.dir")//E:\soft4develop\apache-tomcat-6.0.18\bin
System.getProperty("catalina.home")//E:\soft4develop\apache-tomcat-6.0.18對於jboss同樣適用。其他容器未做測試。

說道這裡,正好有朋友在群裡頭問了個問題,情景式這樣的

登陸需要用Https來做請求,登陸成功後,剩下的其他請求全部走http.

比如https://www.jb51.net/admin/user_manager.apsx

發現這個不需要走Https,就轉寄到

http://www.jb51.net/admin/user_manager.apsx

問題來了

request.getServerPort() 只能擷取https時的port1連接埠

那如何擷取port2連接埠呢。

通過上面的方式可以擷取到tomact的路徑,在通過下面xml的xpath來擷取到

tomcat的server.xml中的連接埠配置拼接,來實現。

擷取tomcat連接埠的方法

複製代碼 代碼如下: public static Integer getTomcatPortFromConfigXml(File serverXml) {
Integer port;
try {
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
domFactory.setNamespaceAware(true); // never forget this!
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = builder.parse(serverXml);
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
XPathExpression expr = xpath.compile
("/Server/Service[@name='Catalina']/Connector[count(@scheme)=0]/@port[1]");
String result = (String) expr.evaluate(doc, XPathConstants.STRING);
port = result != null && result.length() > 0 ? Integer.valueOf(result) : null;
} catch (Exception e) {
port = null;
}
return port;
}

最後附帶下System.ge複製代碼 代碼如下:另外：System.getProperty()中的字串參數如下：

System.getProperty()參數大全
# java.version Java Runtime Environment version
# java.vendor Java Runtime Environment vendor
# java.vendor.url Java vendor URL
# java.home Java installation directory
# java.vm.specification.version Java Virtual Machine specification version
# java.vm.specification.vendor Java Virtual Machine specification vendor
# java.vm.specification.name Java Virtual Machine specification name
# java.vm.version Java Virtual Machine implementation version
# java.vm.vendor Java Virtual Machine implementation vendor
# java.vm.name Java Virtual Machine implementation name
# java.specification.version Java Runtime Environment specification version
# java.specification.vendor Java Runtime Environment specification vendor
# java.specification.name Java Runtime Environment specification name
# java.class.version Java class format version number
# java.class.path Java class path
# java.library.path List of paths to search when loading libraries
# java.io.tmpdir Default temp file path
# java.compiler Name of JIT compiler to use
# java.ext.dirs Path of extension directory or directories
# os.name Operating system name
# os.arch Operating system architecture
# os.version Operating system version
# file.separator File separator ("/" on UNIX)
# path.separator Path separator (":" on UNIX)
# line.separator Line separator ("\n" on UNIX)
# user.name User's account name
# user.home User's home directory
# user.dir User's current working directory

File.getCanonicalPath()和File.getAbsolutePath()大約只是對於new File(".")和new File("..")兩種路徑有所區別。

複製代碼 代碼如下:# 對於getCanonicalPath()函數，“."就表示當前的檔案夾，而”..“則表示當前檔案夾的上一級檔案夾
# 對於getAbsolutePath()函數，則不管”.”、“..”，返回當前的路徑加上你在new File()時設定的路徑
# 至於getPath()函數，得到的只是你在new File()時設定的路徑

比如當前的路徑為 C:\test ：
File directory = new File("abc");
directory.getCanonicalPath(); //得到的是C:\test\abc
directory.getAbsolutePath(); //得到的是C:\test\abc
direcotry.getPath(); //得到的是abc

File directory = new File(".");
directory.getCanonicalPath(); //得到的是C:\test
directory.getAbsolutePath(); //得到的是C:\test\.
direcotry.getPath(); //得到的是.

File directory = new File("..");
directory.getCanonicalPath(); //得到的是C:\
directory.getAbsolutePath(); //得到的是C:\test\..
direcotry.getPath(); //得到的是..