过滤器解决中文乱码（项目）

package com.jp.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; public class GBKFilter implements Filter{ class Request extends HttpServletRequestWrapper{ public Request(HttpServletRequest request) { super(request); } public String toGBK(String input){ try{ byte[] bytes=input.getBytes("iso8859-1"); return new String(bytes,"gbk"); }catch(Exception e){} return null; } @Override public String getParameter(String name){ return toGBK(getHttpServletRequest().getParameter(name)); } @Override public String[] getParameterValues(String name){ String[] values=getHttpServletRequest().getParameterValues(name); if(values!=null){ for(int i=0 ; i<values.length ; i++){ values[i]=toGBK(values[i]); } } return values; } public HttpServletRequest getHttpServletRequest(){ return (HttpServletRequest)super.getRequest(); } } public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest=(HttpServletRequest)request; if(httpRequest.getMethod().equalsIgnoreCase("POST")){ request.setCharacterEncoding("GBK"); }else{ request=new Request(httpRequest); } chain.doFilter(request, response); } public void init(FilterConfig arg0) throws ServletException { } }