为图像请求重写创建 Java 过滤器 [英] Creating Java filter for image requests rewritings

问题描述

我创建了一个过滤器，它可以很好地处理我的应用程序收到的所有请求，为此我编写了新类 ResourceRequestWrapper，它扩展了 HttpServletRequestWrapper 以修改请求.

I have created one filter which is working fine for all requests which my application gets, for this I have written new class ResourceRequestWrapper which extends HttpServletRequestWrapper to modify requests.

例如，当请求 /ui/tx/images/abc.png 时，我覆盖了 getServletPath(), getRequestURL()HttpServletRequestWrapper 的 > 和 getRequestURI() 方法将传入请求的文本修改为 /txeditor/images/abc.png.

For example, when request comes for /ui/tx/images/abc.png I have overridden getServletPath(), getRequestURL() and getRequestURI() methods of HttpServletRequestWrapper to modify text of incoming request to /txeditor/images/abc.png.

现在，我通过修改 server.xml 并添加以下内容，在 JBoss/Tomcat 中创建了虚拟目录，

Now, I have created virtual directory in JBoss/Tomcat by modifying server.xml and adding following,

<Context path="/txeditor" docBase="C:\resources\web_resources\txeditor.war" unpackWAR="false">               
</Context>  

我还在 C:\resources\web_resources\txeditor.war 中定义了 WEB-INF 并创建了如下部署描述符，

I have also defined WEB-INF in C:\resources\web_resources\txeditor.war and created deployment descriptor as follows,

<?xml version="1.0"?>

<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"    "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
   <description>Web descriptor for the html adaptor</description> 
</web-app>

以上一切正常，每个请求都被修改，但是当我的页面打开时，我看不到任何图像，我想当我们修改来自过滤器的请求以访问 server.xml<中定义的虚拟目录时/code>，不可能吗?

Everything above works fine, every request gets modified, but when my page gets opened I am not able to see any images and I think when we are modifying request from filter to access virtual directory defined in server.xml, its not possible?

有人能有其他想法吗?

推荐答案

这确实行不通.您想改为重定向请求.

This is indeed not going to work. You want to redirect the request instead.

String oldUrl = request.getRequestURI();
String newUrl = oldUrl.replaceFirst("/ui/tx/", "/txteditor/");
response.sendRedirect(newUrl);

如果您想要永久 (301) 重定向，请执行以下操作而不是最后一行:

If you want a permanent (301) redirect, do the following instead of the last line:

response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
response.setHeader("Location", newUrl);

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