过滤器-用包装类解决全站乱码

Filter类：

package cn.itcast.web.filter; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Map; 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 CharacterEncodingFilter2 implements Filter { public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) resp; //解决post中文乱码问题 request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); //解决get中文乱码问题 MyRequest myrequest = new MyRequest(request); //自己定义一个request chain.doFilter(myrequest, response); //servlet myrequest.getParameter("username") } //继承HttpServletRequestWrapper ：//sun公司提供的包装类 //自定义request,解决get中文乱码问题 class MyRequest extends HttpServletRequestWrapper{ //request private HttpServletRequest request; public MyRequest(HttpServletRequest request){ super(request); this.request = request; } //重构方法 public String getParameter(String name) { String value = this.request.getParameter(name); //获取用户提交的数据 get 乱码 if(value==null){ return null; } //判断是否是get请求方式 if(!request.getMethod().equals("GET")){ return value; } try { value = new String(value.getBytes("iso8859-1"),this.request.getCharacterEncoding()); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e); } return value; } //重构方法 @Override public Map getParameterMap() { try{ if(!this.request.getMethod().equals("GET")){//判断是否是get请求方式 return this.request.getParameterMap(); } Map<String,String[]> map = this.request.getParameterMap(); //接受客户端的数据 Map<String,String[]> newmap = new HashMap(); for(Map.Entry<String, String[]> entry : map.entrySet()){ String name = entry.getKey(); String values[] = entry.getValue(); if(values==null){ newmap.put(name, new String[]{}); continue; } String newvalues[] = new String[values.length]; for(int i=0; i<values.length;i++){ String value = values[i]; value = new String(value.getBytes("iso8859-1"),this.request.getCharacterEncoding()); newvalues[i] = value; //解决乱码后封装到Map中 } newmap.put(name, newvalues); } return newmap; }catch (Exception e) { throw new RuntimeException(e); } } @Override public String[] getParameterValues(String name) { // TODO Auto-generated method stub return super.getParameterValues(name); } } public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub } public void destroy() { // TODO Auto-generated method stub } }