encodingfilter.java

负责公文的传输及一些处理功能

package com.example.servlet;

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


public class EncodingFilter extends HttpServlet implements Filter {

  private FilterConfig filterConfig;
  private String targetEncoding = "UTF-8";

 
  public void init(FilterConfig filterConfig) throws ServletException {
    this.filterConfig = filterConfig;
    this.targetEncoding = filterConfig.getInitParameter("encoding");
  }

  public void doFilter(ServletRequest srequest, ServletResponse sresponse,FilterChain chain) throws IOException, ServletException {
    try {
      HttpServletRequest request = (HttpServletRequest) srequest;
     
      request.setCharacterEncoding(targetEncoding);
      HttpServletResponse response = (HttpServletResponse)sresponse;
     
      chain.doFilter(request, sresponse);
    }
    catch (ServletException sx) {
      filterConfig.getServletContext().log(sx.getMessage());
    }
    catch (IOException iox) {
      filterConfig.getServletContext().log(iox.getMessage());
    }
  }

  public void destroy() {
    filterConfig = null;
    targetEncoding = null;
  }
}