encodingfilter.java

《J2EE企业级应用开发》一书的配套源代码

package com.j2eeapp.cdstore.filter;

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

import com.j2eeapp.cdstore.bean.ShoppingSession;

public class EncodingFilter extends GenericFilter
{

    
    private String targetEncoding = "gb2312";
    
    public void init(FilterConfig config) throws ServletException {
        this.filterConfig = config;
        this.targetEncoding = config.getInitParameter("encoding");
    }
    
   
     public  void doFilter(ServletRequest srequest, ServletResponse  sresponse, FilterChain chain)
        throws IOException, ServletException {
        //	System.out.println("encoding="+targetEncoding);
            
        HttpServletRequest request = (HttpServletRequest)srequest;
        request.setCharacterEncoding(targetEncoding);
        // move on to the next
       chain.doFilter(srequest,sresponse);  
    }
}