java 使用过滤器实现中文处理
1 package cn.jbit.house.filter; 2 3 import java.io.IOException; 4 import java.io.UnsupportedEncodingException; 5 6 import javax.servlet.Filter; 7 import javax.servlet.FilterChain; 8 import javax.servlet.FilterConfig; 9 import javax.servlet.ServletException; 10 import javax.servlet.ServletRequest; 11 import javax.servlet.ServletResponse; 12 import javax.servlet.http.HttpServletRequest; 13 import javax.servlet.http.HttpServletRequestWrapper; 14 import javax.servlet.http.HttpServletResponse; 15 16 public class CharacterFilter implements Filter { 17 18 private String encoding="utf-8"; 19 20 public void doFilter(ServletRequest request, ServletResponse response, 21 FilterChain chain) throws IOException, ServletException { 22 HttpServletRequest req = (HttpServletRequest)request; 23 HttpServletResponse resp = (HttpServletResponse)response; 24 25 resp.setContentType("text/html;charset="+encoding); 26 27 chain.doFilter(new RequestWrapper(req), resp); 28 } 29 30 public void init(FilterConfig arg0) throws ServletException { 31 } 32 public void destroy() { 33 } 34 /** 35 * 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 36 */ 37 private class RequestWrapper extends HttpServletRequestWrapper { 38 39 public RequestWrapper(HttpServletRequest request) { 40 super(request); 41 } 42 public String getParameter(String name) { 43 String value = super.getParameter(name); 44 if(null == value) return null; 45 value = encoding(value); 46 return value; 47 } 48 public String[] getParameterValues(String name) { 49 String[] temp = super.getParameterValues(name); 50 for(int i=0;i<temp.length;i++) { 51 temp[i] = encoding(temp[i]); 52 } 53 return temp; 54 } 55 56 private String encoding(String str) { 57 try { 58 return new String(str.getBytes("iso-8859-1"),encoding); 59 } catch (UnsupportedEncodingException e) { 60 e.printStackTrace(); 61 } 62 return null; 63 } 64 65 } 66 67 }
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
