过滤器链实现中文转码和文字屏蔽功能(4)

[java]
package com.mars.filter; 
 
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.http.HttpServletRequest; 
import javax.servlet.http.HttpServletRequestWrapper; 
import javax.servlet.http.HttpServletResponse; 
 
public class WordFilter implements Filter { 
    private FilterConfig config = null; 
 
    public void init(FilterConfig filterConfig) throws ServletException { 
 
    } 
 
    public void doFilter(ServletRequest request, ServletResponse response, 
            FilterChain chain) throws IOException, ServletException { 
         
        HttpServletRequest req=(HttpServletRequest)request; 
        HttpServletResponse resp=(HttpServletResponse)response; 
         
        String title = req.getParameter("title"); 
        String content = req.getParameter("content"); 
         
        title = title.replace("张", "李"); 
        content = content.replace("剑桥", "****"); 
         
        req.setAttribute("title", title); 
        req.setAttribute("content", content); 
        chain.doFilter(request, response); 
    } 
 
    public void destroy() { 
        config = null; 
    } 
 
} 

[java]
package com.mars.servlet; 
 
import java.io.IOException; 
 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
public class MessageServlet extends HttpServlet {