Ask a filter question

baozi1

I use a filter to filter if the user's login session is empty, if it is empty, it will automatically jump to the login page.

I put all the pages in the index directory and wrote it like this in the filter xml configuration
<url-pattern> / index / * </ url-pattern> Then I got the result I wanted.

But now I want one page home.jsp in the index directory not to be filtered by the filter, and other pages to be filtered by the filter. What should I write?

wazqwazq

You still put home.jsp outside the index directory!

tellyou

filter can be configured with parameters,
You can configure a parameter called exclusion, separated by commas, and the path recorded in it. Although it enters the filter, it is not processed.

such as
<filter>
.....
<init-param>
<param-name> exclusions </ param-name>
<param-value> /, /index.jsp, /login.do, /logout.do, /test.jsp </ param-value>
</ init-param>
</ filter>

filter

public class MyFilter implements Filter {
  Set exclusions;
  public void init (FilterConfig filterConfig) throws ServletException {
    super.init (filterConfig);
    String exclu = filterConfig.getInitParameter ("exclusions");
    exclusions = new HashSet ();
    // split operations
  }

    public void doFilter (ServletRequest request,
                       ServletResponse response,
                       FilterChain chain) throws IOException, ServletException {

    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpServletResponse httpResponse = (HttpServletResponse) response;

    if (! exclusions.contains (httpRequest.getServletPath ())) {
      // original operation
    }
}

yanwei_85

If only one request is an exception, you can determine the request address in the filter

coolzyao

The solution upstairs is upstairs.
However, it is best to separate filtered and unfiltered pages by directory.

我爱奶牛

Both the 2nd and 3rd floors can solve your problem