一个普通字符编码过滤器例子

代码如下：

 

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

/** 
* 用于设置 HTTP 请求字符编码的过滤器，通过过滤器参数encoding指明使用何种字符编码,用于处理Html Form请求参数的中文问题 
*/ 
public class CharacterEncodingFilter implements Filter { 
protected FilterConfig filterConfig = null; 
protected String encoding = ""; 

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException 
{ 
        if(encoding != null) 
         servletRequest.setCharacterEncoding(encoding); 
         filterChain.doFilter(servletRequest, servletResponse); 
} 

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

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

} 
}