web开发过滤器

Question

哪位大哥帮我看看 我写了一个过滤器，首次登入保存数据到sql server2000出现乱码，以后就不会出现乱码了。代码如下:public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
// HttpServletRequest req=(HttpServletRequest)request;
HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse res = (HttpServletResponse)response;
 res.setCharacterEncoding("UTF-8");
 req.setCharacterEncoding("UTF-8"); // pass the request along the filter chain
chain.doFilter(req, res);
}

Answer 1

这个过滤器过滤的url你没贴出来
可能是刚好就那么一个url没有经过这个过滤器的过滤

Answer 2

你数出流设置不对吧
应该是 req.setContenType("text/html;charset=UTF-8");

Answer 3

public class FilterEncoding implements Filter {       private FilterConfig filterConfig=null;       private String encoding=null;        /* (non-Javadoc)        * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)        */       public void init(FilterConfig filterConfig) throws ServletException {              this.filterConfig=filterConfig;              this.encoding=filterConfig.getInitParameter("encoding");       }        /* (non-Javadoc)        * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)        */       public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {              String encoding=this.encoding;              if(encoding!=null)              {              request.setCharacterEncoding(encoding);                }              chain.doFilter(request, response);       }        /* (non-Javadoc)        * @see javax.servlet.Filter#destroy()        */       public void destroy() {              this.encoding=null;              this.filterConfig=null;       }
}

Answer 4

HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse res = (HttpServletResponse)response;
res.setCharacterEncoding("UTF-8");
req.setCharacterEncoding("UTF-8");
添加一句：
req.setContentType("text/html;charset=GBK");