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How to write a servlet filter which doesn't allow caching E-mail
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This J2EE tip explains a method of implementing a servlet filter that do not allow caching. This may forbid the browser and any intervening cache from caching the results of the request.

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletResponse;
import javax.servlet.ServletRequest;
import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.FilterChain;
import javax.servlet.http.HttpServletResponse;

public class NoCacheFilter implements Filter {
  private FilterConfig filterConfig = null;
  
  public void init(FilterConfig filterConfig) {
    this.filterConfig = filterConfig;
  }
  
  public void destroy() {
    this.filterConfig = null;
  }

  /*The real work happens in doFilter(). 
  The reference to the response object is of type ServletResponse,
  so we need to cast it to HttpServletResponse:
  */

  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chain)
      throws IOException, ServletException {
    HttpServletResponse httpResponse = (HttpServletResponseresponse;

    /*Then we just set the appropriate headers
    and invoke the next filter in the chain:
    */
    httpResponse.setHeader("Cache-Control""no-cache");
    httpResponse.setDateHeader("Expires"0);
    httpResponse.setHeader("Pragma""No-cache");
    chain.doFilter(request, response);
    /* this method calls other filters in the order they are 
    written in web.xml
    */
  }
}


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