encodingfilter.java

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package login;

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

public class EncodingFilter implements Filter {
  public EncodingFilter() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  private FilterConfig config = null;
  private String targetEncoding = "ASCII";

  // GBK  UTF-8

  public void init(FilterConfig config) throws javax.servlet.ServletException {

     this.config = config;

     this.targetEncoding = config.getInitParameter("encoding");

  }


  public void doFilter(ServletRequest request,
                       ServletResponse response,
                       FilterChain chain)
      throws java.io.IOException, javax.servlet.ServletException {

       System.out.println("targetEncoding :" + targetEncoding + "\n");

       request.setCharacterEncoding(targetEncoding);

       chain.doFilter(request,response);


  }


  public void destroy() {

    config = null;

    targetEncoding = null;
  }

  private void jbInit() throws Exception {
  }

}