java 使用过滤器实现中文处理

package cn.jbit.house.filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

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;
import javax.servlet.http.HttpServletResponse;

public class CharacterFilter implements Filter {

    private String encoding="utf-8";
    
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse resp = (HttpServletResponse)response;
        
        resp.setContentType("text/html;charset="+encoding);
        
        chain.doFilter(new RequestWrapper(req), resp);
    }

    public void init(FilterConfig arg0) throws ServletException {
    }
    public void destroy() {
    }
    /**
     * 请求的包装器，用于覆盖getParameter方法，在获取参数时全部进行转码
     */
    private class RequestWrapper extends HttpServletRequestWrapper {

        public RequestWrapper(HttpServletRequest request) {
            super(request);
        }
        public String getParameter(String name) {
            String value = super.getParameter(name);
            if(null == value) return null;
            value = encoding(value);
            return value;
        }
        public String[] getParameterValues(String name) {
            String[] temp = super.getParameterValues(name);
            for(int i=0;i<temp.length;i++) {
                temp[i] = encoding(temp[i]);
            }
            return temp;
        }
        
        private String encoding(String str) {
            try {
                return new String(str.getBytes("iso-8859-1"),encoding);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            return null;
        }
        
    }

}

实现思路 重写getParameter(String name) 、getParameterValues(String name) 方法 实现对post 和 get方式请求的 转码  没时间细写了 以后再修改