Java (JSP/Servlet)：相当于 .jsp 中的 getServletContext()
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Java (JSP/Servlet): equivalent of getServletContext() from inside a .jsp
提问by SyntaxT3rr0r
How should I access the ServletContext from a .jsp? For example, how can I call the getRealPathmethod from inside a .jsp.
我应该如何从 .jsp 访问 ServletContext？例如，如何从 .jsp 内部调用getRealPath方法。
Here's a Servlet, which works fine:
这是一个 Servlet，它工作正常：
protected void doGet(
HttpServletRequest req,
HttpServletResponse resp
) throws ServletException, IOException {
resp.setContentType( "text/html; charset=UTF-8" );
final PrintWriter pw = resp.getWriter();
pw.print( "<html><body>" );
pw.print( getServletContext().getRealPath( "text/en" ) );
pw.print( "</body></html>" );
pw.flush();
pw.close();
}
Now I'm looking for the exact line I'm supposed to insert in the following .jspto do exactly the same thing as the servlet above is doing.
现在我正在寻找我应该在下面的.jsp 中插入的确切行，以执行与上面的 servlet 所做的完全相同的事情。
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
... // What should I insert here
</body>
</html>
采纳答案by Bozho
The ServletContextis accessible via the applicationimplicit object.
该ServletContext是通过访问application隐含对象。
Since each JSP is a servlet, you can also use getServletContext().
由于每个 JSP 都是一个 servlet，因此您还可以使用getServletContext().
But.. avoid having code like that in the JSP. Instead, obtain the value you need in your servlet and set it as a request attribute, simply reading it in the JSP (via JSTL preferably)
但是.. 避免在 JSP 中使用类似的代码。相反，在您的 servlet 中获取您需要的值并将其设置为请求属性，只需在 JSP 中读取它（最好通过 JSTL）
回答by Roman
Try this:
尝试这个：
${pageContext.servletContext}
回答by Mr.Expert
I think this should work fine on a JSP Page:
我认为这在 JSP 页面上应该可以正常工作：
<body>
<%
out.print(getServletContext().getAttribute("attribute"));
%>
</body>
回答by chris
if you're looking to use the getRealPath() method, you might consider looking into a jstl tag called 'c:url'
如果您想使用 getRealPath() 方法，您可以考虑查看名为“c:url”的 jstl 标记
<c:url value="text/en" />
回答by Mahmoud Abou-Eita
Simply use application.getRealPath(" ");.
只需使用application.getRealPath(" ");.
