java获取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对于jboss同样适用。其他容器未做测试。

说道这里,正好有朋友在群里头问了个问题,情景式这样的

登陆需要用Https来做请求,登陆成功后,剩下的其他请求全部走http.

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

发现这个不需要走Https,就转发到

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

问题来了

request.getServerPort() 只能获取https时的port1端口

那如何获取port2端口呢。

通过上面的方式可以获取到tomact的路径,在通过下面xml的xpath来获取到

tomcat的server.xml中的端口配置拼接,来实现。

获取tomcat端口的方法


代码如下:

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;
 }

最后附带下System.ge


代码如下:

另外：System.getProperty()中的字符串参数如下：

System.getProperty()参数大全
# 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()大约只是对于new File(".")和new File("..")两种路径有所区别。

代码如下:

# 对于getCanonicalPath()函数，“."就表示当前的文件夹，而”..“则表示当前文件夹的上一级文件夹
# 对于getAbsolutePath()函数，则不管”.”、“..”，返回当前的路径加上你在new File()时设定的路径
# 至于getPath()函数，得到的只是你在new File()时设定的路径

比如当前的路径为 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..