replacetextfilter.java

Tomcat与Java.Web开发技术详解源代码

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ReplaceTextFilter implements Filter {

  private FilterConfig config = null;
  private String searchStr=null;
  private String replaceStr=null;
  public void init(FilterConfig config) throws ServletException {
    this.config = config;
    searchStr=config.getInitParameter("search");
    replaceStr=config.getInitParameter("replace");
  }
  public void destroy() {
    config = null;
  }
  public void doFilter(ServletRequest request, ServletResponse response,
                     FilterChain chain) throws IOException, ServletException {

        ReplaceTextWrapper myWrappedResp = new ReplaceTextWrapper( response,
        searchStr, replaceStr);
        config.getServletContext().log("ReplaceTextFilter:before call chain.doFilter()");
        chain.doFilter(request,  myWrappedResp);
        config.getServletContext().log("ReplaceTextFilter:after call chain.doFilter()");
        myWrappedResp.getOutputStream().close();

  }
}