如何使用java知道webcontainer的路径？

Question

我需要使用java获取web容器路径，有什么方法吗？我需要使用JSP或Servlet来获取文件路径

Answer 1

你可能正在寻找^{}：

Returns the portion of the request URI that indicates the context of the request. The context path always comes first in a request URI. The path starts with a "/" character but does not end with a "/" character. For servlets in the default (root) context, this method returns "". The container does not decode this string.

。。。或^{}

Returns the part of this request's URL that calls the servlet. This path starts with a "/" character and includes either the servlet name or a path to the servlet, but does not include any extra path information or a query string. Same as the value of the CGI variable SCRIPT_NAME.

Answer 2

你对HttpServletRequest的^{}方法感兴趣

Answer 3

I need to use it using JSP or Servlet to get a file path.

那么文件被存储在战争的公共网络内容中了？使用^{}

String relativeWebPath = "/file.jpg";
String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);
File file = new File(absoluteDiskPath);
InputStream input = new FileInputStream(file); // I guess this is what you want.
// ...

请注意，这仅在容器扩展战争时有效。否则，如果你真正想要的只是得到^{，最好使用^{}

String relativeWebPath = "/file.jpg";
InputStream input = getServletContext().getResourceAsStream(relativeWebPath);
// ...

另请参见：

• getResourceAsStream() vs FileInputStream