setencodefilter.java

这是一个网上书店

package com.ebookstore.common;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetEncodeFilter implements Filter {

  protected FilterConfig filterConfig    = null;

  protected String       defaultEncoding = null;

  public void init(FilterConfig arg0) throws ServletException {
    this.filterConfig = arg0;
    this.defaultEncoding = filterConfig.getInitParameter("defaultencoding") == null ? "UTF-8"
        : filterConfig.getInitParameter("defaultencoding");
  }

  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      throws IOException, ServletException {
    request.setCharacterEncoding(selectEncoding());
    chain.doFilter(request, response);
  }

  public void destroy() {
    this.defaultEncoding = null;
    this.filterConfig = null;
  }

  protected String selectEncoding() {
    return this.defaultEncoding;
  }

}