java獲取web容器地址

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。

說道這里,正好有朋友在群里頭問了個問題,情景式這樣的

登陸需要用Https來做請求,登陸成功后,剩下的其他請求全部走http.

比如https://xx:port1/admin/user_manager.apsx

發現這個不需要走Https,就轉發到

http://xx:port2/admin/user_manager.apsx

問題來了

request.getServerPort() 只能獲取https時的port1端口

那如何獲取port2端口呢。

通過上面的方式可以獲取到tomact的路徑,在通過下面xml的xpath來獲取到

tomcat的server.xml中的端口配置拼接,來實現。

獲取tomcat端口的方法

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;
}

這里有個類似的案例 可以參考

http://www.dewen.org/q/5678

最后附帶下System.ge

另外：System.getProperty()中的字符串參數如下：

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。

# 對於getCanonicalPath()函數，“."就表示當前的文件夾，而”..“則表示當前文件夾的上一級文件夾
# 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..