Filter简介

/**
 * 统一设置字符集
 */</span>
public class CharsetEncodingFilter implements Filter {
    private String encoding;
    
    @Override
    public void destroy() {
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        //System.out.println("CharsetEncodingFilter_____begin———————");
        // 设置字符集</span>
        request.setCharacterEncoding(encoding);
        
        //继续执行</span>
        chain.doFilter(request, response);
        //System.out.println("CharsetEncodingFilter______end——————");
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        encoding=filterConfig.getInitParameter("encoding");
    }
}  

2）配置xml文件

    <filter>
         <!-- 配置实现Filter的类 --></span>

         <filter-name>CharsetEncodingFilter</filter-name>
         <filter-class>com.bjpowernode.drp.util.filter.CharsetEncodingFilter</filter-class>
           <!-- 设置初始化参数 --> </span>          
         <init-param>
             <param-name>encoding</param-name>
             <param-value>GBK</param-value>
         </init-param>
     </filter>
     <filter-mapping>
          <!-- 设置要拦截的url --></span>           
         <filter-name>CharsetEncodingFilter</filter-name>
         <url-pattern>*.jsp</url-pattern>
     </filter-mapping>