setcharacterencodingfilter.java

该实例简单的介绍了dwr在j2ee开发中的应用

package com.dwr;

/**
 * <p>Title: </p>
 * <p>Description: 2007-01</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @version 1.0
 */
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;
import javax.servlet.UnavailableException;

public class SetCharacterEncodingFilter
    implements Filter {
  protected String encoding = null;
  protected FilterConfig filterConfig = null;
  protected boolean ignore = true;

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

  public void doFilter(ServletRequest request, ServletResponse response,
                       FilterChain chain) throws IOException, ServletException {
	  System.out.println("请求路径："+((javax.servlet.http.HttpServletRequest)request).getRequestURI());
	  System.out.println("请求参数："+((javax.servlet.http.HttpServletRequest)request).getQueryString());
// Conditionally select and set the character encoding to be used
    if (ignore || (request.getCharacterEncoding() == null)) {
      String encoding = selectEncoding(request);
      if (encoding != null)
        request.setCharacterEncoding(encoding);
    }

// Pass control on to the next filter
    chain.doFilter(request, response);

  }

  public void init(FilterConfig filterConfig) throws ServletException {

    this.filterConfig = filterConfig;
    this.encoding = filterConfig.getInitParameter("encoding");
    String value = filterConfig.getInitParameter("ignore");
    if (value == null)
      this.ignore = true;
    else if (value.equalsIgnoreCase("true"))
      this.ignore = true;
    else if (value.equalsIgnoreCase("yes"))
      this.ignore = true;
    else
      this.ignore = false;

  }

  protected String selectEncoding(ServletRequest request) {
    return (this.encoding);
  }
}