jsp和存数据库编码问题

增加一个过滤器

package webwork.senssic.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;

public class EncodingFilter implements Filter {
	private FilterConfig filterConfig = null;
	private String encoding = null;

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

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterChain) throws IOException, ServletException {
		if (request.getCharacterEncoding() == null) {
			if (encoding != null) {
				request.setCharacterEncoding(encoding);
			}
			filterChain.doFilter(request, response);
		}
	}

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

web.xml配置如下

<filter>
    <filter-name>EncodingFilter</filter-name>
    <filter-class>webwork.senssic.filter.EncodingFilter</filter-class>
    <init-param>
       <param-name>encoding</param-name>
       <param-value>UTF-8</param-value>
    </init-param>
</filter>
  <filter-mapping>
    <filter-name>EncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>